Release v0.5.0

just want to increment
2026-03-19 09:13:59 -04:00 · 2026-03-19 09:09:59 -04:00 · 2026-03-19 09:09:46 -04:00 · 2026-03-19 09:01:11 -04:00 · 2026-03-16 05:27:23 -04:00 · 2026-03-13 13:57:20 -04:00
146 changed files with 29957 additions and 10156 deletions
@@ -0,0 +1,12 @@
+This library is fully staticly linked. There should be no external dependencies.
+
+When building, use build.sh, not make. When building for tests use build.sh -t
+
+When making TUI menus, try to use the first leter of the command and the key to press to execute that command. For example, if the command is "Open file" try to use a keypress of "o" upper or lower case to signal to open the file. Use this instead of number keyed menus when possible. In the command, the letter should be underlined that signifies the command.
+
+When deleting, everything gets moved to the Trash folder.
+
+MAKEFILE POLICY: There should be only ONE Makefile in the entire project. All build logic (library, tests, examples, websocket) must be consolidated into the root Makefile. Do not create separate Makefiles in subdirectories as this creates testing inconsistencies where you test with one Makefile but run with another.
+
+TESTS POLICY: On the printout, dont just show pass or fail, show the expected values, and what the actual result was. If dealing with nostr events, print the entire json event. If dealing with relay communication, show the whole communication.
+
@@ -1,5 +1,4 @@
 Trash/
-cjson/
 cline_history/
 libsodium/
 monocypher-4.0.2/
@@ -8,10 +7,9 @@ nips/
 node_modules/
 nostr-tools/
 tiny-AES-c/
-mbedtls/
-mbedtls-arm64-install/
-mbedtls-install/
-secp256k1/
+blossom/
+ndk/
+
 Trash/debug_tests/
 node_modules/

@@ -21,5 +19,3 @@ node_modules/
 *.dylib
 *.dll
 build/
-mbedtls-install/
-mbedtls-arm64-install/
@@ -0,0 +1,7 @@
+---
+description: "Increments and pushes the repo"
+---
+
+Run increment_and_push.sh followed in the command line with a good description of the changes that were made.
+
+For example: ./increment_and_push.sh "Fixed that nasty bug"
@@ -0,0 +1,3 @@
+{
+    "git.ignoreLimitWarning": true
+}
@@ -1,88 +0,0 @@
-# NOSTR Core Library - Cleanup Report
-
-## Overview
-After successfully resolving the NIP-04 ECDH compatibility issues, we performed a comprehensive cleanup of debugging artifacts and temporary files created during the troubleshooting process.
-
-## Files Moved to Trash/debug_tests/
-
-### NIP-04 Debug Tests (Created During Troubleshooting)
- `aes_debug_test.c/.exe` - AES encryption debugging
- `ecdh_debug_test.c/.exe` - ECDH shared secret debugging  
- `ecdh_x_coordinate_test.c/.exe` - X coordinate extraction testing
- `ecdh_comprehensive_debug_test.c/.exe` - Comprehensive ECDH testing
- `nip04_decrypt_debug_test.c/.exe` - Decryption specific debugging
- `nip04_detailed_debug_test.c/.exe` - Detailed step-by-step debugging
- `nip04_ecdh_debug_test.c/.exe` - NIP-04 ECDH specific testing
- `nip04_encrypt_only_test.c/.exe` - Encryption-only testing
- `nip04_minimal_test.c/.exe` - Minimal test cases
- `nip04_simple_test.c/.exe` - Simple test implementation
- `nip04_step_by_step_debug_test.c/.exe` - Step-by-step debugging
- `decrypt_debug_minimal.c/.exe` - Minimal decryption debugging
- `noble_vs_libsecp_comparison.c/.exe` - JavaScript comparison testing
-
-### Other Debug Files
- `debug_bip32.c/.exe` - BIP32 debugging
- `debug_bip32_test.c/.exe` - BIP32 test debugging
- `frame_debug_test.c/.exe` - Frame debugging
- `debug.log` - **9.8GB debug log file** (major space savings!)
-
-### JavaScript Reference Implementation
- `nostr-tools/` - JavaScript reference implementation used for comparison
-  - `nip04.ts` - TypeScript NIP-04 implementation
-  - `debug_nip04.js` - JavaScript debugging script
-
-## Files Kept (Essential Tests)
-
-### Core Functionality Tests
- `nip04_test.c` - **Main comprehensive NIP-04 test** (our final working test)
- `simple_init_test.c` - Basic library initialization test
- `nostr_crypto_test.c` - Cryptographic functions test
- `nostr_test_bip32.c` - BIP32 HD wallet test
- `relay_pool_test.c` - Relay pool functionality test
- `sync_test.c` - Synchronization test
- `test_pow_loop.c` - Proof of work test
-
-### Build Infrastructure
- `Makefile` - Test compilation rules
- `build.tests.sh` - Test build script
-
-## Key Improvements Made
-
-### 1. Function Naming Clarity
- Added `nostr_schnorr_sign()` - clearly indicates BIP-340 Schnorr signatures
- Maintained `nostr_ec_sign()` as legacy wrapper for backward compatibility
- **Benefit**: Prevents future confusion between ECDH and signature operations
-
-### 2. ECDH Compatibility Fix
- Fixed ECDH implementation to match NIP-04 specification exactly
- Custom hash function that extracts only X coordinate (no hashing)
- **Result**: 100% compatible with JavaScript NOSTR ecosystem
-
-### 3. Memory Management
- Fixed buffer overflow issues in NIP-04 decryption
- Proper base64 buffer size calculations
- Enhanced error handling and cleanup
- **Result**: No more segmentation faults
-
-## Final Test Status
-
-```
-✅ nip04_test: PASS (Round-trip + Reference compatibility)
-✅ Memory management: Fixed (No segfaults)  
-✅ ECDH compatibility: 100% JavaScript ecosystem compatible
-✅ Function naming: Clear and unambiguous
-```
-
-## Space Savings
- **Removed 9.8GB debug.log file**
- Cleaned up 20+ debugging test files and executables
- Organized debugging artifacts in Trash/debug_tests/ for easy reference
-
-## Secp256k1 Status
- Checked for extra debugging code: **CLEAN**
- All files are standard libsecp256k1 build artifacts
- No cleanup needed
-
---
-
-**The NOSTR core library is now in a clean, production-ready state with fully functional NIP-04 encryption/decryption that's compatible with the broader NOSTR ecosystem!**
@@ -1,187 +0,0 @@
-cmake_minimum_required(VERSION 3.12)
-project(nostr_core VERSION 1.0.0 LANGUAGES C)
-
-# Set C standard
-set(CMAKE_C_STANDARD 99)
-set(CMAKE_C_STANDARD_REQUIRED ON)
-
-# Build options
-option(NOSTR_BUILD_STATIC "Build static library" ON)
-option(NOSTR_BUILD_SHARED "Build shared library" ON)
-option(NOSTR_BUILD_EXAMPLES "Build examples" ON)
-option(NOSTR_BUILD_TESTS "Build tests" ON)
-option(NOSTR_ENABLE_WEBSOCKETS "Enable WebSocket support" ON)
-option(NOSTR_USE_MBEDTLS "Use mbedTLS for crypto (otherwise use built-in)" OFF)
-
-# Compiler flags
-if(CMAKE_COMPILER_IS_GNUCC OR CMAKE_C_COMPILER_ID MATCHES "Clang")
-    set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -Wall -Wextra -Werror")
-    set(CMAKE_C_FLAGS_DEBUG "-g -O0")
-    set(CMAKE_C_FLAGS_RELEASE "-O3 -DNDEBUG")
-endif()
-
-# Include directories
-include_directories(${CMAKE_CURRENT_SOURCE_DIR})
-include_directories(${CMAKE_CURRENT_SOURCE_DIR}/cjson)
-
-# Source files
-set(NOSTR_CORE_SOURCES
-    nostr_core/core.c
-    nostr_core/core_relays.c
-    nostr_core/core_relay_pool.c
-    nostr_core/nostr_crypto.c
-    nostr_core/nostr_secp256k1.c
-    cjson/cJSON.c
-)
-
-set(NOSTR_CORE_HEADERS
-    nostr_core.h
-    nostr_crypto.h
-    cjson/cJSON.h
-)
-
-# Add mbedTLS if enabled
-if(NOSTR_USE_MBEDTLS)
-    add_subdirectory(mbedtls)
-    list(APPEND NOSTR_CORE_SOURCES mbedtls_wrapper.c)
-    add_definitions(-DNOSTR_USE_MBEDTLS=1)
-endif()
-
-# Add WebSocket support if enabled
-if(NOSTR_ENABLE_WEBSOCKETS)
-    file(GLOB WEBSOCKET_SOURCES "nostr_websocket/*.c")
-    file(GLOB WEBSOCKET_HEADERS "nostr_websocket/*.h")
-    list(APPEND NOSTR_CORE_SOURCES ${WEBSOCKET_SOURCES})
-    list(APPEND NOSTR_CORE_HEADERS ${WEBSOCKET_HEADERS})
-    add_definitions(-DNOSTR_ENABLE_WEBSOCKETS=1)
-endif()
-
-# Create static library
-if(NOSTR_BUILD_STATIC)
-    add_library(nostr_core_static STATIC ${NOSTR_CORE_SOURCES})
-    set_target_properties(nostr_core_static PROPERTIES OUTPUT_NAME nostr_core)
-    target_link_libraries(nostr_core_static m)
-    
-    if(NOSTR_USE_MBEDTLS)
-        target_link_libraries(nostr_core_static mbedcrypto mbedx509 mbedtls)
-    endif()
-endif()
-
-# Create shared library
-if(NOSTR_BUILD_SHARED)
-    add_library(nostr_core_shared SHARED ${NOSTR_CORE_SOURCES})
-    set_target_properties(nostr_core_shared PROPERTIES OUTPUT_NAME nostr_core)
-    target_link_libraries(nostr_core_shared m)
-    
-    if(NOSTR_USE_MBEDTLS)
-        target_link_libraries(nostr_core_shared mbedcrypto mbedx509 mbedtls)
-    endif()
-    
-    # Set version information
-    set_target_properties(nostr_core_shared PROPERTIES
-        VERSION ${PROJECT_VERSION}
-        SOVERSION 1
-    )
-endif()
-
-# Create alias targets for easier integration
-if(NOSTR_BUILD_STATIC)
-    add_library(nostr_core::static ALIAS nostr_core_static)
-endif()
-
-if(NOSTR_BUILD_SHARED)
-    add_library(nostr_core::shared ALIAS nostr_core_shared)
-endif()
-
-# Examples
-if(NOSTR_BUILD_EXAMPLES)
-    add_subdirectory(examples)
-endif()
-
-# Tests
-if(NOSTR_BUILD_TESTS)
-    enable_testing()
-    add_subdirectory(tests)
-endif()
-
-# Installation
-include(GNUInstallDirs)
-
-# Install libraries
-if(NOSTR_BUILD_STATIC)
-    install(TARGETS nostr_core_static
-        ARCHIVE DESTINATION ${CMAKE_INSTALL_LIBDIR}
-    )
-endif()
-
-if(NOSTR_BUILD_SHARED)
-    install(TARGETS nostr_core_shared
-        LIBRARY DESTINATION ${CMAKE_INSTALL_LIBDIR}
-        RUNTIME DESTINATION ${CMAKE_INSTALL_BINDIR}
-    )
-endif()
-
-# Install headers
-install(FILES ${NOSTR_CORE_HEADERS}
-    DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}/nostr
-)
-
-# Install pkg-config file
-configure_file(nostr_core.pc.in nostr_core.pc @ONLY)
-install(FILES ${CMAKE_CURRENT_BINARY_DIR}/nostr_core.pc
-    DESTINATION ${CMAKE_INSTALL_LIBDIR}/pkgconfig
-)
-
-# Generate export configuration
-include(CMakePackageConfigHelpers)
-
-configure_package_config_file(
-    ${CMAKE_CURRENT_SOURCE_DIR}/cmake/nostr_core-config.cmake.in
-    ${CMAKE_CURRENT_BINARY_DIR}/nostr_core-config.cmake
-    INSTALL_DESTINATION ${CMAKE_INSTALL_LIBDIR}/cmake/nostr_core
-)
-
-write_basic_package_version_file(
-    ${CMAKE_CURRENT_BINARY_DIR}/nostr_core-config-version.cmake
-    VERSION ${PROJECT_VERSION}
-    COMPATIBILITY SameMajorVersion
-)
-
-install(FILES
-    ${CMAKE_CURRENT_BINARY_DIR}/nostr_core-config.cmake
-    ${CMAKE_CURRENT_BINARY_DIR}/nostr_core-config-version.cmake
-    DESTINATION ${CMAKE_INSTALL_LIBDIR}/cmake/nostr_core
-)
-
-# Export targets
-if(NOSTR_BUILD_STATIC OR NOSTR_BUILD_SHARED)
-    set(EXPORT_TARGETS "")
-    if(NOSTR_BUILD_STATIC)
-        list(APPEND EXPORT_TARGETS nostr_core_static)
-    endif()
-    if(NOSTR_BUILD_SHARED)
-        list(APPEND EXPORT_TARGETS nostr_core_shared)
-    endif()
-    
-    install(EXPORT nostr_core-targets
-        FILE nostr_core-targets.cmake
-        NAMESPACE nostr_core::
-        DESTINATION ${CMAKE_INSTALL_LIBDIR}/cmake/nostr_core
-    )
-    
-    export(TARGETS ${EXPORT_TARGETS}
-        FILE ${CMAKE_CURRENT_BINARY_DIR}/nostr_core-targets.cmake
-        NAMESPACE nostr_core::
-    )
-endif()
-
-# Summary
-message(STATUS "NOSTR Core Library Configuration:")
-message(STATUS "  Version: ${PROJECT_VERSION}")
-message(STATUS "  Build static library: ${NOSTR_BUILD_STATIC}")
-message(STATUS "  Build shared library: ${NOSTR_BUILD_SHARED}")
-message(STATUS "  Build examples: ${NOSTR_BUILD_EXAMPLES}")
-message(STATUS "  Build tests: ${NOSTR_BUILD_TESTS}")
-message(STATUS "  Enable WebSockets: ${NOSTR_ENABLE_WEBSOCKETS}")
-message(STATUS "  Use mbedTLS: ${NOSTR_USE_MBEDTLS}")
-message(STATUS "  Install prefix: ${CMAKE_INSTALL_PREFIX}")
@@ -1,309 +0,0 @@
-# Exportable C NOSTR Library Design Guide
-
-This document outlines the design principles and structure for making the C NOSTR library easily exportable and reusable across multiple projects.
-
-## Overview
-
-The C NOSTR library is designed as a modular, self-contained implementation that can be easily integrated into other projects while maintaining compatibility with the broader NOSTR ecosystem.
-
-## Design Principles
-
-### 1. Modular Architecture
- **Core Layer**: Essential NOSTR functionality (`nostr_core.c/h`)
- **Crypto Layer**: Self-contained cryptographic primitives (`nostr_crypto.c/h`)
- **WebSocket Layer**: Optional networking functionality (`nostr_websocket/`)
- **Dependencies**: Minimal external dependencies (only cJSON and mbedTLS)
-
-### 2. Clean API Surface
- Consistent function naming with `nostr_` prefix
- Clear return codes using `NOSTR_SUCCESS`/`NOSTR_ERROR_*` constants
- Well-documented function signatures
- No global state where possible
-
-### 3. Self-Contained Crypto
- Custom implementations of SHA-256, HMAC, secp256k1
- BIP39 wordlist embedded in code
- No external crypto library dependencies for core functionality
- Optional mbedTLS integration for enhanced security
-
-### 4. Cross-Platform Compatibility
- Standard C99 code
- Platform-specific code isolated in separate modules
- ARM64 and x86_64 tested builds
- Static library compilation support
-
-## Library Structure
-
-```
-c_nostr/
-├── nostr_core.h          # High-level API
-├── nostr_core.c          # Implementation
-├── nostr_crypto.h        # Crypto primitives API
-├── nostr_crypto.c        # Self-contained crypto
-├── libnostr_core.a       # Static library (x86_64)
-├── libnostr_core.so      # Shared library (x86_64)
-├── cjson/                # JSON parsing (vendored)
-├── mbedtls/              # Optional crypto backend
-├── examples/             # Usage examples
-├── tests/                # Test suites
-└── nostr_websocket/      # Optional WebSocket layer
-```
-
-## Integration Methods
-
-### Method 1: Static Library Linking
-
-**Best for**: Applications that want a single binary with all NOSTR functionality embedded.
-
-```bash
-# Build the library
-make lib
-
-# In your project Makefile:
-CFLAGS += -I/path/to/c_nostr
-LDFLAGS += -L/path/to/c_nostr -lnostr_core -lm -static
-```
-
-**Usage:**
-```c
-#include "nostr_core.h"
-
-int main() {
-    if (nostr_init() != NOSTR_SUCCESS) {
-        return 1;
-    }
-    
-    unsigned char private_key[32], public_key[32];
-    nostr_generate_keypair(private_key, public_key);
-    
-    cJSON* event = nostr_create_text_event("Hello NOSTR!", private_key);
-    // ... use event
-    
-    nostr_cleanup();
-    return 0;
-}
-```
-
-### Method 2: Source Code Integration
-
-**Best for**: Applications that want to customize the crypto backend or minimize dependencies.
-
-```bash
-# Copy essential files to your project:
-cp nostr_core.{c,h} your_project/src/
-cp nostr_crypto.{c,h} your_project/src/
-cp -r cjson/ your_project/src/
-```
-
-**Compile with your project:**
-```c
-// In your source
-#include "nostr_core.h"
-// Use NOSTR functions directly
-```
-
-### Method 3: Git Submodule
-
-**Best for**: Projects that want to track upstream changes and contribute back.
-
-```bash
-# In your project root:
-git submodule add https://github.com/yourorg/c_nostr.git deps/c_nostr
-git submodule update --init --recursive
-
-# In your Makefile:
-CFLAGS += -Ideps/c_nostr
-LDFLAGS += -Ldeps/c_nostr -lnostr_core
-```
-
-### Method 4: Shared Library
-
-**Best for**: System-wide installation or multiple applications sharing the same NOSTR implementation.
-
-```bash
-# Install system-wide
-sudo make install
-
-# In your project:
-CFLAGS += $(pkg-config --cflags nostr_core)
-LDFLAGS += $(pkg-config --libs nostr_core)
-```
-
-## API Design for Exportability
-
-### Consistent Error Handling
-```c
-typedef enum {
-    NOSTR_SUCCESS = 0,
-    NOSTR_ERROR_INVALID_INPUT = -1,
-    NOSTR_ERROR_CRYPTO_FAILED = -2,
-    NOSTR_ERROR_MEMORY_ALLOCATION = -3,
-    NOSTR_ERROR_JSON_PARSE = -4,
-    NOSTR_ERROR_NETWORK = -5
-} nostr_error_t;
-
-const char* nostr_strerror(int error_code);
-```
-
-### Clean Resource Management
-```c
-// Always provide cleanup functions
-int nostr_init(void);
-void nostr_cleanup(void);
-
-// JSON objects returned should be freed by caller
-cJSON* nostr_create_text_event(const char* content, const unsigned char* private_key);
-// Caller must call cJSON_Delete(event) when done
-```
-
-### Optional Features
-```c
-// Compile-time feature toggles
-#ifndef NOSTR_DISABLE_WEBSOCKETS
-int nostr_connect_relay(const char* url);
-#endif
-
-#ifndef NOSTR_DISABLE_IDENTITY_PERSISTENCE
-int nostr_save_identity(const unsigned char* private_key, const char* password, int account);
-#endif
-```
-
-## Configuration System
-
-### Build-Time Configuration
-```c
-// nostr_config.h (generated during build)
-#define NOSTR_VERSION "1.0.0"
-#define NOSTR_HAS_MBEDTLS 1
-#define NOSTR_HAS_WEBSOCKETS 1
-#define NOSTR_STATIC_BUILD 1
-```
-
-### Runtime Configuration
-```c
-typedef struct {
-    int log_level;
-    char* identity_file_path;
-    int default_account;
-    int enable_networking;
-} nostr_config_t;
-
-int nostr_set_config(const nostr_config_t* config);
-const nostr_config_t* nostr_get_config(void);
-```
-
-## Testing and Validation
-
-### Ecosystem Compatibility Testing
-The library includes comprehensive test suites that validate compatibility with reference implementations like `nak`:
-
-```bash
-# Run all tests
-cd tests && make test
-
-# Test specific functionality
-make test-crypto  # Cryptographic primitives
-make test-core    # High-level NOSTR functions
-```
-
-### Test Vectors
-Real-world test vectors are generated using `nak` to ensure ecosystem compatibility:
- Key generation and derivation (BIP39/BIP32)
- Event creation and signing
- Bech32 encoding/decoding
- Message serialization
-
-## Documentation for Exporters
-
-### Essential Files Checklist
-For projects integrating this library, you need:
-
-**Core Files (Required):**
- `nostr_core.h` - Main API
- `nostr_core.c` - Implementation
- `nostr_crypto.h` - Crypto API
- `nostr_crypto.c` - Self-contained crypto
- `cjson/` directory - JSON parsing
-
-**Optional Files:**
- `nostr_websocket/` - WebSocket relay support
- `mbedtls/` - Enhanced crypto backend
- `examples/` - Usage examples
- `tests/` - Validation tests
-
-### Minimal Integration Example
-```c
-// minimal_nostr.c - Smallest possible integration
-#include "nostr_core.h"
-
-int main() {
-    // Initialize library
-    nostr_init();
-    
-    // Generate keypair
-    unsigned char priv[32], pub[32];
-    nostr_generate_keypair(priv, pub);
-    
-    // Create and sign event
-    cJSON* event = nostr_create_text_event("Hello from my app!", priv);
-    char* json_string = cJSON_Print(event);
-    printf("Event: %s\n", json_string);
-    
-    // Cleanup
-    free(json_string);
-    cJSON_Delete(event);
-    nostr_cleanup();
-    return 0;
-}
-```
-
-**Compile:**
-```bash
-gcc -I. minimal_nostr.c nostr_core.c nostr_crypto.c cjson/cJSON.c -lm -o minimal_nostr
-```
-
-## Future Considerations
-
-### Language Bindings
-The C library is designed to be easily wrapped:
- **Python**: Use ctypes or cffi
- **JavaScript**: Use Node.js FFI or WASM compilation
- **Go**: Use cgo
- **Rust**: Use bindgen for FFI bindings
-
-### WebAssembly Support
-The library can be compiled to WebAssembly for browser usage:
-```bash
-emcc -O3 -s WASM=1 -s EXPORTED_FUNCTIONS='["_nostr_init", "_nostr_generate_keypair"]' \
-     nostr_core.c nostr_crypto.c cjson/cJSON.c -o nostr.wasm
-```
-
-### Package Manager Support
-Future versions may include:
- pkgconfig files for system installation
- CMake integration for easier builds
- vcpkg/Conan package definitions
-
-## Contributing Back
-
-Projects using this library are encouraged to:
-1. Report compatibility issues
-2. Submit test vectors from their use cases  
-3. Contribute performance improvements
-4. Add support for additional NIPs
-
-## Version Compatibility
-
-The library follows semantic versioning:
- **Major**: Breaking API changes
- **Minor**: New features, backward compatible
- **Patch**: Bug fixes
-
-API stability guarantees:
- All functions prefixed with `nostr_` are part of the stable API
- Internal functions (static or prefixed with `_`) may change
- Configuration structures may be extended but not modified
-
---
-
-This design ensures the C NOSTR library can be easily adopted by other projects while maintaining high compatibility with the NOSTR ecosystem standards.
@@ -1,29 +0,0 @@
-# c-nostr Export and Implementation Guide
-
-## Overview
-
-This guide provides essential information for developers using the `c-nostr` library, particularly regarding the capabilities and limitations of its self-contained modules, such as the HTTP client.
-
-## HTTP Client (`http_client.c`)
-
-The `http_client` module is a lightweight, self-contained HTTP/HTTPS client designed for simple and direct web requests. It is ideal for tasks like fetching NIP-11 information from Nostr relays or interacting with standard, permissive web APIs.
-
-### Key Features
-
-*   **Self-Contained**: It is built with `mbedTLS` and has no external dependencies beyond standard C libraries, making it highly portable.
-*   **Simplicity**: It provides a straightforward `http_get()` function for making web requests.
-*   **TLS Support**: It supports HTTPS and basic TLS 1.3/1.2 features, including SNI (Server Name Indication) and ALPN (Application-Layer Protocol Negotiation).
-
-### Limitations
-
-The `http_client` is intentionally simple and is **not a full-featured web browser**. Due to its minimalist design, it will likely be blocked by websites that employ advanced anti-bot protection systems.
-
-*   **Incompatibility with Advanced Bot Protection**: Sites like Google, Cloudflare, and others use sophisticated fingerprinting techniques to distinguish between real browsers and automated clients. They analyze the exact combination of TLS cipher suites, TLS extensions, and HTTP headers. Our client's fingerprint does not match a standard browser, so these sites will preemptively drop the connection, typically resulting in a `HTTP_ERROR_NETWORK` error.
-
-*   **Intended Use Case**: This client is best suited for interacting with known, friendly APIs and Nostr relays. It is **not** designed for general web scraping or for accessing services that are heavily guarded against automated traffic.
-
-### Best Practices
-
-*   **Use for APIs and Relays**: Rely on this client for fetching data from well-defined, public endpoints that do not have aggressive bot-detection measures in place.
-*   **Avoid Protected Sites**: Do not attempt to use this client to access services like Google Search, as such attempts will fail. For those use cases, a full-featured library like `libcurl` or a dedicated web-scraping framework is required.
-*   **Check the Test Suite**: The `tests/http_client_test.c` file contains test cases that demonstrate both the successful use cases (e.g., `httpbin.org`) and the expected failures (e.g., `google.com`), providing a clear reference for the client's capabilities.
@@ -1,266 +0,0 @@
-# NOSTR Core Library - Usage Guide
-
-## Overview
-
-The NOSTR Core Library (`libnostr_core`) is a self-contained, exportable C library for NOSTR protocol implementation. It requires **no external cryptographic dependencies** (no OpenSSL, no libwally) and can be easily integrated into other projects.
-
-## Key Features
-
- **Self-Contained Crypto**: All cryptographic operations implemented from scratch
- **Zero External Dependencies**: Only requires standard C library, cJSON, and libwebsockets
- **Cross-Platform**: Builds on Linux, macOS, Windows (with appropriate toolchain)
- **NIP-06 Compliant**: Proper BIP39/BIP32 implementation for key derivation
- **Thread-Safe**: Core cryptographic functions are stateless and thread-safe
- **Easy Integration**: Simple C API with clear error handling
-
-## File Structure for Export
-
-### Core Library Files (Required)
-```
-libnostr_core/
-├── nostr_core.h           # Main public API header
-├── nostr_core.c           # Core implementation
-├── nostr_crypto.h         # Crypto implementation header
-├── nostr_crypto.c         # Self-contained crypto implementation
-├── Makefile              # Build configuration
-└── cjson/                # JSON library (can be replaced with system cJSON)
-    ├── cJSON.h
-    └── cJSON.c
-```
-
-### Optional Files
-```
-├── examples/             # Usage examples (helpful for integration)
-├── LIBRARY_USAGE.md     # This usage guide
-├── SELF_CONTAINED_CRYPTO.md  # Crypto implementation details
-└── CROSS_PLATFORM_GUIDE.md  # Platform-specific build notes
-```
-
-## Integration Methods
-
-### Method 1: Static Library Integration
-
-1. **Copy Required Files**:
-   ```bash
-   cp nostr_core.h nostr_core.c nostr_crypto.h nostr_crypto.c /path/to/your/project/
-   cp -r cjson/ /path/to/your/project/
-   ```
-
-2. **Build Static Library**:
-   ```bash
-   gcc -c -fPIC nostr_core.c nostr_crypto.c cjson/cJSON.c
-   ar rcs libnostr_core.a nostr_core.o nostr_crypto.o cJSON.o
-   ```
-
-3. **Link in Your Project**:
-   ```bash
-   gcc your_project.c -L. -lnostr_core -lm -o your_project
-   ```
-
-### Method 2: Direct Source Integration
-
-Simply include the source files directly in your project:
-
-```c
-// In your project
-#include "nostr_core.h"
-
-// Compile with:
-// gcc your_project.c nostr_core.c nostr_crypto.c cjson/cJSON.c -lm
-```
-
-### Method 3: Shared Library Integration
-
-1. **Build Shared Library**:
-   ```bash
-   make libnostr_core.so
-   ```
-
-2. **Install System-Wide** (optional):
-   ```bash
-   sudo cp libnostr_core.so /usr/local/lib/
-   sudo cp nostr_core.h /usr/local/include/
-   sudo ldconfig
-   ```
-
-3. **Use in Projects**:
-   ```bash
-   gcc your_project.c -lnostr_core -lm
-   ```
-
-## Basic Usage Example
-
-```c
-#include "nostr_core.h"
-#include <stdio.h>
-#include <stdlib.h>
-
-int main() {
-    // Initialize the library
-    if (nostr_init() != NOSTR_SUCCESS) {
-        fprintf(stderr, "Failed to initialize NOSTR library\n");
-        return 1;
-    }
-    
-    // Generate a keypair
-    unsigned char private_key[32];
-    unsigned char public_key[32];
-    
-    if (nostr_generate_keypair(private_key, public_key) != NOSTR_SUCCESS) {
-        fprintf(stderr, "Failed to generate keypair\n");
-        nostr_cleanup();
-        return 1;
-    }
-    
-    // Convert to hex and bech32
-    char private_hex[65], public_hex[65];
-    char nsec[100], npub[100];
-    
-    nostr_bytes_to_hex(private_key, 32, private_hex);
-    nostr_bytes_to_hex(public_key, 32, public_hex);
-    nostr_key_to_bech32(private_key, "nsec", nsec);
-    nostr_key_to_bech32(public_key, "npub", npub);
-    
-    printf("Private Key: %s\n", private_hex);
-    printf("Public Key:  %s\n", public_hex);
-    printf("nsec:        %s\n", nsec);
-    printf("npub:        %s\n", npub);
-    
-    // Create and sign an event
-    cJSON* event = nostr_create_text_event("Hello NOSTR!", private_key);
-    if (event) {
-        char* event_json = cJSON_Print(event);
-        printf("Signed Event: %s\n", event_json);
-        free(event_json);
-        cJSON_Delete(event);
-    }
-    
-    // Cleanup
-    nostr_cleanup();
-    return 0;
-}
-```
-
-## Dependency Management
-
-### Required Dependencies
- **Standard C Library**: malloc, string functions, file I/O
- **Math Library**: `-lm` (for cryptographic calculations)
- **cJSON**: JSON parsing (included, or use system version)
-
-### Optional Dependencies
- **libwebsockets**: Only needed for relay communication functions
- **System cJSON**: Can replace bundled version
-
-### Minimal Integration (Crypto Only)
-If you only need key generation and signing:
-
-```bash
-# Build with minimal dependencies
-gcc -DNOSTR_CRYPTO_ONLY your_project.c nostr_crypto.c -lm
-```
-
-## Cross-Platform Considerations
-
-### Linux
- Works out of the box with GCC
- Install build-essential: `sudo apt install build-essential`
-
-### macOS
- Works with Xcode command line tools
- May need: `xcode-select --install`
-
-### Windows
- Use MinGW-w64 or MSYS2
- Or integrate with Visual Studio project
-
-### Embedded Systems
- Library is designed to work on resource-constrained systems
- No heap allocations in core crypto functions
- Stack usage is predictable and bounded
-
-## API Reference
-
-### Initialization
-```c
-int nostr_init(void);                    // Initialize library
-void nostr_cleanup(void);                // Cleanup resources
-const char* nostr_strerror(int error);   // Get error string
-```
-
-### Key Generation
-```c
-int nostr_generate_keypair(unsigned char* private_key, unsigned char* public_key);
-int nostr_generate_mnemonic_and_keys(char* mnemonic, size_t mnemonic_size, 
-                                     int account, unsigned char* private_key, 
-                                     unsigned char* public_key);
-int nostr_derive_keys_from_mnemonic(const char* mnemonic, int account,
-                                    unsigned char* private_key, unsigned char* public_key);
-```
-
-### Event Creation
-```c
-cJSON* nostr_create_text_event(const char* content, const unsigned char* private_key);
-cJSON* nostr_create_profile_event(const char* name, const char* about, 
-                                  const unsigned char* private_key);
-int nostr_sign_event(cJSON* event, const unsigned char* private_key);
-```
-
-### Utilities
-```c
-void nostr_bytes_to_hex(const unsigned char* bytes, size_t len, char* hex);
-int nostr_hex_to_bytes(const char* hex, unsigned char* bytes, size_t len);
-int nostr_key_to_bech32(const unsigned char* key, const char* hrp, char* output);
-nostr_input_type_t nostr_detect_input_type(const char* input);
-```
-
-## Error Handling
-
-All functions return standardized error codes:
-
- `NOSTR_SUCCESS` (0): Operation successful
- `NOSTR_ERROR_INVALID_INPUT` (-1): Invalid parameters
- `NOSTR_ERROR_CRYPTO_FAILED` (-2): Cryptographic operation failed
- `NOSTR_ERROR_MEMORY_FAILED` (-3): Memory allocation failed
- `NOSTR_ERROR_IO_FAILED` (-4): File I/O operation failed
- `NOSTR_ERROR_NETWORK_FAILED` (-5): Network operation failed
-
-## Security Considerations
-
-1. **Private Key Handling**: Always clear private keys from memory when done
-2. **Random Number Generation**: Uses `/dev/urandom` on Unix systems
-3. **Memory Safety**: All buffers are bounds-checked
-4. **Constant-Time Operations**: Critical crypto operations are timing-attack resistant
-
-## Testing Your Integration
-
-Use the provided examples to verify your integration:
-
-```bash
-# Test key generation
-./examples/simple_keygen
-
-# Test mnemonic functionality
-./examples/mnemonic_generation
-
-# Test event creation
-./examples/text_event
-
-# Test all functionality
-./examples/utility_functions
-```
-
-## Support and Documentation
-
- See `examples/` directory for comprehensive usage examples
- Check `SELF_CONTAINED_CRYPTO.md` for cryptographic implementation details
- Review `CROSS_PLATFORM_GUIDE.md` for platform-specific notes
- All functions are documented in `nostr_core.h`
-
-## License
-
-This library is designed to be freely integrable into other projects. Check the individual file headers for specific licensing information.
-
---
-
-**Quick Start**: Copy `nostr_core.h`, `nostr_core.c`, `nostr_crypto.h`, `nostr_crypto.c`, and the `cjson/` folder to your project, then compile with `-lm`. That's it!
@@ -1,142 +0,0 @@
-# NOSTR Core Library Makefile
-# Standalone library build system
-
-CC = gcc
-AR = ar
-CFLAGS = -Wall -Wextra -std=c99 -fPIC -O2
-DEBUG_CFLAGS = -Wall -Wextra -std=c99 -fPIC -g -DDEBUG
-STATIC_CFLAGS = -Wall -Wextra -std=c99 -O2 -static
-
-# Logging compile flags
-LOGGING_FLAGS ?= -DENABLE_FILE_LOGGING -DENABLE_WEBSOCKET_LOGGING -DENABLE_DEBUG_LOGGING
-ifneq ($(ENABLE_LOGGING),)
-    LOGGING_FLAGS += -DENABLE_FILE_LOGGING -DENABLE_WEBSOCKET_LOGGING -DENABLE_DEBUG_LOGGING
-endif
-
-# Include paths
-INCLUDES = -I. -Inostr_core -Icjson -Isecp256k1/include
-
-# Library source files
-LIB_SOURCES = nostr_core/core.c nostr_core/core_relays.c nostr_core/nostr_crypto.c nostr_core/nostr_secp256k1.c nostr_core/nostr_aes.c nostr_core/nostr_chacha20.c cjson/cJSON.c
-LIB_OBJECTS = $(LIB_SOURCES:.c=.o)
-ARM64_LIB_OBJECTS = $(LIB_SOURCES:.c=.arm64.o)
-
-# Library outputs (static only)
-STATIC_LIB = libnostr_core.a
-ARM64_STATIC_LIB = libnostr_core_arm64.a
-
-# Example files
-EXAMPLE_SOURCES = $(wildcard examples/*.c)
-EXAMPLE_TARGETS = $(EXAMPLE_SOURCES:.c=)
-
-# Default target - build static library
-default: $(STATIC_LIB)
-
-# Build all targets (static only)
-all: $(STATIC_LIB) examples
-
-# Static library
-$(STATIC_LIB): $(LIB_OBJECTS)
-	@echo "Creating static library: $@"
-	$(AR) rcs $@ $^
-
-# ARM64 cross-compilation settings
-ARM64_CC = aarch64-linux-gnu-gcc
-ARM64_AR = aarch64-linux-gnu-ar
-ARM64_INCLUDES = -I. -Inostr_core -Icjson
-
-# ARM64 static library
-$(ARM64_STATIC_LIB): $(ARM64_LIB_OBJECTS)
-	@echo "Creating ARM64 static library: $@"
-	$(ARM64_AR) rcs $@ $^
-
-
-# Object files (x86_64)
-%.o: %.c
-	@echo "Compiling: $<"
-	$(CC) $(CFLAGS) $(LOGGING_FLAGS) $(INCLUDES) -c $< -o $@
-
-# ARM64 object files
-%.arm64.o: %.c
-	@echo "Compiling for ARM64: $<"
-	$(ARM64_CC) $(CFLAGS) $(LOGGING_FLAGS) $(ARM64_INCLUDES) -c $< -o $@
-
-# Examples
-examples: $(EXAMPLE_TARGETS)
-
-examples/%: examples/%.c $(STATIC_LIB)
-	@echo "Building example: $@"
-	$(CC) $(STATIC_CFLAGS) $(LOGGING_FLAGS) $(INCLUDES) $< -o $@ ./libnostr_core.a ./secp256k1/.libs/libsecp256k1.a -lm
-
-# ARM64 targets
-arm64: $(ARM64_STATIC_LIB)
-arm64-all: $(ARM64_STATIC_LIB)
-
-# Debug build
-debug: CFLAGS = $(DEBUG_CFLAGS)
-debug: clean default
-
-# Install library to system (static only)
-install: $(STATIC_LIB)
-	@echo "Installing static library..."
-	sudo cp $(STATIC_LIB) /usr/local/lib/
-	sudo cp nostr_core/nostr_core.h /usr/local/include/
-	sudo cp nostr_core/nostr_crypto.h /usr/local/include/
-
-# Uninstall library
-uninstall:
-	@echo "Uninstalling library..."
-	sudo rm -f /usr/local/lib/$(STATIC_LIB)
-	sudo rm -f /usr/local/include/nostr_core.h
-	sudo rm -f /usr/local/include/nostr_crypto.h
-
-# Test the library
-test: examples/simple_keygen
-	@echo "Running simple key generation test..."
-	./examples/simple_keygen
-
-# Run crypto tests
-test-crypto:
-	@echo "Running comprehensive crypto test suite..."
-	cd tests && make test
-
-# Clean build artifacts
-clean:
-	@echo "Cleaning build artifacts..."
-	rm -f $(LIB_OBJECTS) $(ARM64_LIB_OBJECTS)
-	rm -f $(STATIC_LIB) $(ARM64_STATIC_LIB)
-	rm -f $(EXAMPLE_TARGETS)
-
-# Create distribution package
-dist: clean
-	@echo "Creating distribution package..."
-	mkdir -p dist/nostr_core
-	cp -r *.h *.c Makefile examples/ tests/ README.md LICENSE dist/nostr_core/ 2>/dev/null || true
-	cd dist && tar -czf nostr_core.tar.gz nostr_core/
-	@echo "Distribution package created: dist/nostr_core.tar.gz"
-
-# Help
-help:
-	@echo "NOSTR Core Library Build System"
-	@echo "==============================="
-	@echo ""
-	@echo "Available targets:"
-	@echo "  default      - Build static library (recommended)"
-	@echo "  all          - Build static library and examples"
-	@echo "  arm64        - Build ARM64 static library"
-	@echo "  arm64-all    - Build ARM64 static library"
-	@echo "  debug        - Build with debug symbols"
-	@echo "  examples     - Build example programs"
-	@echo "  test         - Run simple test"
-	@echo "  test-crypto  - Run comprehensive crypto test suite"
-	@echo "  install      - Install static library to system (/usr/local)"
-	@echo "  uninstall    - Remove library from system"
-	@echo "  clean        - Remove build artifacts"
-	@echo "  dist         - Create distribution package"
-	@echo "  help         - Show this help"
-	@echo ""
-	@echo "Library outputs (static only):"
-	@echo "  $(STATIC_LIB)      - x86_64 static library"
-	@echo "  $(ARM64_STATIC_LIB) - ARM64 static library"
-
-.PHONY: default all arm64 arm64-all debug examples test test-crypto install uninstall clean dist help
@@ -0,0 +1,777 @@
+# Relay Pool API Reference
+
+This document describes the public API for the Nostr Relay Pool implementation in [`core_relay_pool.c`](nostr_core/core_relay_pool.c).
+
+## Function Summary
+
+| Function | Description |
+|----------|-------------|
+| [`nostr_relay_pool_create()`](nostr_core/core_relay_pool.c:594) | Create and initialize a new relay pool |
+| [`nostr_relay_pool_destroy()`](nostr_core/core_relay_pool.c:733) | Destroy pool and cleanup all resources |
+| [`nostr_relay_pool_add_relay()`](nostr_core/core_relay_pool.c:648) | Add a relay URL to the pool |
+| [`nostr_relay_pool_remove_relay()`](nostr_core/core_relay_pool.c:702) | Remove a relay URL from the pool |
+| [`nostr_relay_pool_set_auth()`](nostr_core/core_relay_pool.c:616) | Configure pool-wide NIP-42 authentication key and enable flag |
+| [`nostr_relay_pool_subscribe()`](nostr_core/core_relay_pool.c:778) | Create async subscription with callbacks |
+| [`nostr_pool_subscription_close()`](nostr_core/core_relay_pool.c:491) | Close subscription and free resources |
+| [`nostr_relay_pool_run()`](nostr_core/core_relay_pool.c:1192) | Run event loop for specified timeout |
+| [`nostr_relay_pool_poll()`](nostr_core/core_relay_pool.c:1232) | Single iteration poll and dispatch |
+| [`nostr_relay_pool_query_sync()`](nostr_core/core_relay_pool.c:695) | Synchronous query returning event array |
+| [`nostr_relay_pool_get_event()`](nostr_core/core_relay_pool.c:825) | Get single most recent event |
+| [`nostr_relay_pool_publish_async()`](nostr_core/core_relay_pool.c:866) | Publish event with async callbacks |
+| [`nostr_relay_pool_get_relay_status()`](nostr_core/core_relay_pool.c:944) | Get connection status for a relay |
+| [`nostr_relay_pool_list_relays()`](nostr_core/core_relay_pool.c:960) | List all relays and their statuses |
+| [`nostr_relay_pool_get_relay_stats()`](nostr_core/core_relay_pool.c:992) | Get detailed statistics for a relay |
+| [`nostr_relay_pool_reset_relay_stats()`](nostr_core/core_relay_pool.c:1008) | Reset statistics for a relay |
+| [`nostr_relay_pool_get_relay_query_latency()`](nostr_core/core_relay_pool.c:1045) | Get average query latency for a relay |
+
+## Pool Lifecycle
+
+### Create Pool
+**Function:** [`nostr_relay_pool_create()`](nostr_core/core_relay_pool.c:219)
+```c
+nostr_relay_pool_t* nostr_relay_pool_create(void);
+```
+
+**Example:**
+```c
+#include "nostr_core.h"
+
+int main() {
+    // Create a new relay pool
+    nostr_relay_pool_t* pool = nostr_relay_pool_create();
+    if (!pool) {
+        fprintf(stderr, "Failed to create relay pool\n");
+        return -1;
+    }
+    
+    // Use the pool...
+    
+    // Clean up
+    nostr_relay_pool_destroy(pool);
+    return 0;
+}
+```
+
+### Destroy Pool
+**Function:** [`nostr_relay_pool_destroy()`](nostr_core/core_relay_pool.c:304)
+```c
+void nostr_relay_pool_destroy(nostr_relay_pool_t* pool);
+```
+
+**Example:**
+```c
+// Properly cleanup a relay pool
+void cleanup_pool(nostr_relay_pool_t* pool) {
+    if (pool) {
+        // This will close all active subscriptions and relay connections
+        nostr_relay_pool_destroy(pool);
+        pool = NULL;
+    }
+}
+```
+
+## Relay Management
+
+### Configure Pool Authentication (NIP-42)
+**Function:** [`nostr_relay_pool_set_auth()`](nostr_core/core_relay_pool.c:616)
+```c
+int nostr_relay_pool_set_auth(nostr_relay_pool_t* pool, const unsigned char* private_key, int enable);
+```
+
+**Description:**
+- Sets a pool-wide private key used to sign NIP-42 `AUTH` responses.
+- Enables/disables NIP-42 handling for all relays in the pool.
+- Propagates auth-enabled state to existing relay connections.
+
+**Example:**
+```c
+unsigned char privkey[32];
+nostr_hex_to_bytes("91ba716fa9e7ea2fcbad360cf4f8e0d312f73984da63d90f524ad61a6a1e7dbe", privkey, 32);
+
+nostr_relay_pool_t* pool = nostr_relay_pool_create(nostr_pool_reconnect_config_default());
+nostr_relay_pool_set_auth(pool, privkey, 1); // enable NIP-42 auto AUTH handling
+```
+
+### Add Relay
+**Function:** [`nostr_relay_pool_add_relay()`](nostr_core/core_relay_pool.c:229)
+```c
+int nostr_relay_pool_add_relay(nostr_relay_pool_t* pool, const char* relay_url);
+```
+
+**Example:**
+```c
+int setup_relays(nostr_relay_pool_t* pool) {
+    const char* relays[] = {
+        "wss://relay.damus.io",
+        "wss://nos.lol",
+        "wss://relay.nostr.band"
+    };
+    
+    for (int i = 0; i < 3; i++) {
+        int result = nostr_relay_pool_add_relay(pool, relays[i]);
+        if (result != NOSTR_SUCCESS) {
+            fprintf(stderr, "Failed to add relay %s: %d\n", relays[i], result);
+            return -1;
+        }
+        printf("Added relay: %s\n", relays[i]);
+    }
+    
+    return 0;
+}
+```
+
+### Remove Relay
+**Function:** [`nostr_relay_pool_remove_relay()`](nostr_core/core_relay_pool.c:273)
+```c
+int nostr_relay_pool_remove_relay(nostr_relay_pool_t* pool, const char* relay_url);
+```
+
+**Example:**
+```c
+int remove_slow_relay(nostr_relay_pool_t* pool) {
+    const char* slow_relay = "wss://slow-relay.example.com";
+    
+    int result = nostr_relay_pool_remove_relay(pool, slow_relay);
+    if (result == NOSTR_SUCCESS) {
+        printf("Successfully removed relay: %s\n", slow_relay);
+    } else {
+        printf("Failed to remove relay %s (may not exist)\n", slow_relay);
+    }
+    
+    return result;
+}
+```
+
+## Subscriptions (Asynchronous)
+
+### Subscribe to Events
+**Function:** [`nostr_relay_pool_subscribe()`](nostr_core/core_relay_pool.c:399)
+```c
+nostr_pool_subscription_t* nostr_relay_pool_subscribe(
+    nostr_relay_pool_t* pool,
+    const char** relay_urls, 
+    int relay_count,
+    cJSON* filter,
+    void (*on_event)(cJSON* event, const char* relay_url, void* user_data),
+    void (*on_eose)(void* user_data),
+    void* user_data);
+```
+
+**Example:**
+```c
+#include "cjson/cJSON.h"
+
+// Event callback - called for each received event
+void handle_event(cJSON* event, const char* relay_url, void* user_data) {
+    cJSON* content = cJSON_GetObjectItem(event, "content");
+    cJSON* pubkey = cJSON_GetObjectItem(event, "pubkey");
+    
+    if (content && pubkey) {
+        printf("Event from %s: %s (by %s)\n", 
+               relay_url, 
+               cJSON_GetStringValue(content),
+               cJSON_GetStringValue(pubkey));
+    }
+}
+
+// EOSE callback - called when all relays finish sending stored events
+void handle_eose(void* user_data) {
+    printf("All relays finished sending stored events\n");
+}
+
+int subscribe_to_notes(nostr_relay_pool_t* pool) {
+    // Create filter for kind 1 (text notes) from last hour
+    cJSON* filter = cJSON_CreateObject();
+    cJSON* kinds = cJSON_CreateArray();
+    cJSON_AddItemToArray(kinds, cJSON_CreateNumber(1));
+    cJSON_AddItemToObject(filter, "kinds", kinds);
+    
+    time_t since = time(NULL) - 3600; // Last hour
+    cJSON_AddItemToObject(filter, "since", cJSON_CreateNumber(since));
+    cJSON_AddItemToObject(filter, "limit", cJSON_CreateNumber(50));
+    
+    // Subscribe to specific relays
+    const char* relay_urls[] = {
+        "wss://relay.damus.io",
+        "wss://nos.lol"
+    };
+    
+    nostr_pool_subscription_t* sub = nostr_relay_pool_subscribe(
+        pool,
+        relay_urls,
+        2,
+        filter,
+        handle_event,
+        handle_eose,
+        NULL  // user_data
+    );
+    
+    cJSON_Delete(filter); // Pool makes its own copy
+    
+    if (!sub) {
+        fprintf(stderr, "Failed to create subscription\n");
+        return -1;
+    }
+    
+    // Drive the event loop to receive events
+    printf("Listening for events for 30 seconds...\n");
+    nostr_relay_pool_run(pool, 30000); // 30 seconds
+    
+    // Close subscription
+    nostr_pool_subscription_close(sub);
+    return 0;
+}
+```
+
+### Close Subscription
+**Function:** [`nostr_pool_subscription_close()`](nostr_core/core_relay_pool.c:491)
+```c
+int nostr_pool_subscription_close(nostr_pool_subscription_t* subscription);
+```
+
+**Example:**
+```c
+// Subscription management with cleanup
+typedef struct {
+    nostr_pool_subscription_t* subscription;
+    int event_count;
+    int should_stop;
+} subscription_context_t;
+
+void event_counter(cJSON* event, const char* relay_url, void* user_data) {
+    subscription_context_t* ctx = (subscription_context_t*)user_data;
+    ctx->event_count++;
+    
+    printf("Received event #%d from %s\n", ctx->event_count, relay_url);
+    
+    // Stop after 10 events
+    if (ctx->event_count >= 10) {
+        ctx->should_stop = 1;
+    }
+}
+
+int limited_subscription(nostr_relay_pool_t* pool) {
+    subscription_context_t ctx = {0};
+    
+    // Create filter
+    cJSON* filter = cJSON_CreateObject();
+    cJSON* kinds = cJSON_CreateArray();
+    cJSON_AddItemToArray(kinds, cJSON_CreateNumber(1));
+    cJSON_AddItemToObject(filter, "kinds", kinds);
+    
+    const char* relay_urls[] = {"wss://relay.damus.io"};
+    
+    ctx.subscription = nostr_relay_pool_subscribe(
+        pool, relay_urls, 1, filter, event_counter, NULL, &ctx);
+    
+    cJSON_Delete(filter);
+    
+    if (!ctx.subscription) {
+        return -1;
+    }
+    
+    // Poll until we should stop
+    while (!ctx.should_stop) {
+        int events = nostr_relay_pool_poll(pool, 100);
+        if (events < 0) break;
+    }
+    
+    // Clean up
+    int result = nostr_pool_subscription_close(ctx.subscription);
+    printf("Subscription closed with result: %d\n", result);
+    
+    return 0;
+}
+```
+
+## Event Loop
+
+### Run Timed Loop
+**Function:** [`nostr_relay_pool_run()`](nostr_core/core_relay_pool.c:1192)
+```c
+int nostr_relay_pool_run(nostr_relay_pool_t* pool, int timeout_ms);
+```
+
+**Example:**
+```c
+int run_event_loop(nostr_relay_pool_t* pool) {
+    printf("Starting event loop for 60 seconds...\n");
+    
+    // Run for 60 seconds, processing all incoming events
+    int total_events = nostr_relay_pool_run(pool, 60000);
+    
+    if (total_events < 0) {
+        fprintf(stderr, "Event loop error\n");
+        return -1;
+    }
+    
+    printf("Processed %d events total\n", total_events);
+    return 0;
+}
+```
+
+### Single Poll Iteration
+**Function:** [`nostr_relay_pool_poll()`](nostr_core/core_relay_pool.c:1232)
+```c
+int nostr_relay_pool_poll(nostr_relay_pool_t* pool, int timeout_ms);
+```
+
+**Example:**
+```c
+// Integration with custom main loop
+int custom_main_loop(nostr_relay_pool_t* pool) {
+    int running = 1;
+    int total_events = 0;
+    
+    while (running) {
+        // Poll for Nostr events (non-blocking with 50ms timeout)
+        int events = nostr_relay_pool_poll(pool, 50);
+        if (events > 0) {
+            total_events += events;
+            printf("Processed %d events this iteration\n", events);
+        }
+        
+        // Do other work in your application
+        // handle_ui_events();
+        // process_background_tasks();
+        
+        // Check exit condition
+        // running = !should_exit();
+        
+        // Simple exit after 100 events for demo
+        if (total_events >= 100) {
+            running = 0;
+        }
+    }
+    
+    printf("Main loop finished, processed %d total events\n", total_events);
+    return 0;
+}
+```
+
+## Synchronous Operations
+
+### Query Multiple Events
+**Function:** [`nostr_relay_pool_query_sync()`](nostr_core/core_relay_pool.c:695)
+```c
+cJSON** nostr_relay_pool_query_sync(
+    nostr_relay_pool_t* pool,
+    const char** relay_urls,
+    int relay_count, 
+    cJSON* filter,
+    int* event_count,
+    int timeout_ms);
+```
+
+**Example:**
+```c
+int query_recent_notes(nostr_relay_pool_t* pool) {
+    // Create filter for recent text notes
+    cJSON* filter = cJSON_CreateObject();
+    cJSON* kinds = cJSON_CreateArray();
+    cJSON_AddItemToArray(kinds, cJSON_CreateNumber(1));
+    cJSON_AddItemToObject(filter, "kinds", kinds);
+    cJSON_AddItemToObject(filter, "limit", cJSON_CreateNumber(20));
+    
+    const char* relay_urls[] = {
+        "wss://relay.damus.io",
+        "wss://nos.lol"
+    };
+    
+    int event_count = 0;
+    cJSON** events = nostr_relay_pool_query_sync(
+        pool, relay_urls, 2, filter, &event_count, 10000); // 10 second timeout
+    
+    cJSON_Delete(filter);
+    
+    if (!events) {
+        printf("No events received or query failed\n");
+        return -1;
+    }
+    
+    printf("Received %d events:\n", event_count);
+    for (int i = 0; i < event_count; i++) {
+        cJSON* content = cJSON_GetObjectItem(events[i], "content");
+        if (content) {
+            printf("  %d: %s\n", i + 1, cJSON_GetStringValue(content));
+        }
+        
+        // Free each event
+        cJSON_Delete(events[i]);
+    }
+    
+    // Free the events array
+    free(events);
+    return event_count;
+}
+```
+
+### Get Single Most Recent Event
+**Function:** [`nostr_relay_pool_get_event()`](nostr_core/core_relay_pool.c:825)
+```c
+cJSON* nostr_relay_pool_get_event(
+    nostr_relay_pool_t* pool,
+    const char** relay_urls,
+    int relay_count,
+    cJSON* filter,
+    int timeout_ms);
+```
+
+**Example:**
+```c
+int get_latest_note_from_pubkey(nostr_relay_pool_t* pool, const char* pubkey_hex) {
+    // Create filter for specific author's notes
+    cJSON* filter = cJSON_CreateObject();
+    cJSON* kinds = cJSON_CreateArray();
+    cJSON_AddItemToArray(kinds, cJSON_CreateNumber(1));
+    cJSON_AddItemToObject(filter, "kinds", kinds);
+    
+    cJSON* authors = cJSON_CreateArray();
+    cJSON_AddItemToArray(authors, cJSON_CreateString(pubkey_hex));
+    cJSON_AddItemToObject(filter, "authors", authors);
+    
+    cJSON_AddItemToObject(filter, "limit", cJSON_CreateNumber(1));
+    
+    const char* relay_urls[] = {"wss://relay.damus.io"};
+    
+    cJSON* event = nostr_relay_pool_get_event(
+        pool, relay_urls, 1, filter, 5000); // 5 second timeout
+    
+    cJSON_Delete(filter);
+    
+    if (!event) {
+        printf("No recent event found for pubkey %s\n", pubkey_hex);
+        return -1;
+    }
+    
+    cJSON* content = cJSON_GetObjectItem(event, "content");
+    cJSON* created_at = cJSON_GetObjectItem(event, "created_at");
+    
+    if (content && created_at) {
+        printf("Latest note: %s (created at %ld)\n", 
+               cJSON_GetStringValue(content),
+               (long)cJSON_GetNumberValue(created_at));
+    }
+    
+    cJSON_Delete(event);
+    return 0;
+}
+```
+
+### Publish Event
+**Function:** [`nostr_relay_pool_publish_async()`](nostr_core/core_relay_pool.c:866)
+```c
+int nostr_relay_pool_publish_async(
+    nostr_relay_pool_t* pool,
+    const char** relay_urls,
+    int relay_count,
+    cJSON* event);
+```
+
+**Example:**
+```c
+int publish_text_note(nostr_relay_pool_t* pool, const char* content) {
+    // Create a basic text note event (this is simplified - real implementation
+    // would need proper signing with private key)
+    cJSON* event = cJSON_CreateObject();
+    cJSON_AddItemToObject(event, "kind", cJSON_CreateNumber(1));
+    cJSON_AddItemToObject(event, "content", cJSON_CreateString(content));
+    cJSON_AddItemToObject(event, "created_at", cJSON_CreateNumber(time(NULL)));
+    
+    // In real usage, you'd add pubkey, id, sig fields here
+    cJSON_AddItemToObject(event, "pubkey", cJSON_CreateString("your_pubkey_hex"));
+    cJSON_AddItemToObject(event, "id", cJSON_CreateString("event_id_hash"));
+    cJSON_AddItemToObject(event, "sig", cJSON_CreateString("event_signature"));
+    cJSON_AddItemToObject(event, "tags", cJSON_CreateArray());
+    
+    const char* relay_urls[] = {
+        "wss://relay.damus.io",
+        "wss://nos.lol",
+        "wss://relay.nostr.band"
+    };
+    
+    printf("Publishing note: %s\n", content);
+    
+    int success_count = nostr_relay_pool_publish_async(
+        pool, relay_urls, 3, event, my_callback, user_data);
+    
+    cJSON_Delete(event);
+    
+    printf("Successfully published to %d out of 3 relays\n", success_count);
+    
+    if (success_count == 0) {
+        fprintf(stderr, "Failed to publish to any relay\n");
+        return -1;
+    }
+    
+    return success_count;
+}
+```
+
+## Status and Statistics
+
+### Get Relay Status
+**Function:** [`nostr_relay_pool_get_relay_status()`](nostr_core/core_relay_pool.c:944)
+```c
+nostr_pool_relay_status_t nostr_relay_pool_get_relay_status(
+    nostr_relay_pool_t* pool, 
+    const char* relay_url);
+```
+
+**Example:**
+```c
+void check_relay_status(nostr_relay_pool_t* pool, const char* relay_url) {
+    nostr_pool_relay_status_t status = nostr_relay_pool_get_relay_status(pool, relay_url);
+    
+    const char* status_str;
+    switch (status) {
+        case NOSTR_POOL_RELAY_DISCONNECTED:
+            status_str = "DISCONNECTED";
+            break;
+        case NOSTR_POOL_RELAY_CONNECTING:
+            status_str = "CONNECTING";
+            break;
+        case NOSTR_POOL_RELAY_CONNECTED:
+            status_str = "CONNECTED";
+            break;
+        case NOSTR_POOL_RELAY_ERROR:
+            status_str = "ERROR";
+            break;
+        default:
+            status_str = "UNKNOWN";
+            break;
+    }
+    
+    printf("Relay %s status: %s\n", relay_url, status_str);
+}
+```
+
+### List All Relays
+**Function:** [`nostr_relay_pool_list_relays()`](nostr_core/core_relay_pool.c:960)
+```c
+int nostr_relay_pool_list_relays(
+    nostr_relay_pool_t* pool,
+    char*** relay_urls,
+    nostr_pool_relay_status_t** statuses);
+```
+
+**Example:**
+```c
+void print_all_relays(nostr_relay_pool_t* pool) {
+    char** relay_urls = NULL;
+    nostr_pool_relay_status_t* statuses = NULL;
+    
+    int count = nostr_relay_pool_list_relays(pool, &relay_urls, &statuses);
+    
+    if (count < 0) {
+        printf("Failed to list relays\n");
+        return;
+    }
+    
+    if (count == 0) {
+        printf("No relays configured\n");
+        return;
+    }
+    
+    printf("Configured relays (%d):\n", count);
+    for (int i = 0; i < count; i++) {
+        const char* status_str = (statuses[i] == NOSTR_POOL_RELAY_CONNECTED) ? 
+                                 "CONNECTED" : "DISCONNECTED";
+        printf("  %s - %s\n", relay_urls[i], status_str);
+        
+        // Free the duplicated URL string
+        free(relay_urls[i]);
+    }
+    
+    // Free the arrays
+    free(relay_urls);
+    free(statuses);
+}
+```
+
+### Get Relay Statistics
+**Function:** [`nostr_relay_pool_get_relay_stats()`](nostr_core/core_relay_pool.c:992)
+```c
+const nostr_relay_stats_t* nostr_relay_pool_get_relay_stats(
+    nostr_relay_pool_t* pool, 
+    const char* relay_url);
+```
+
+**Example:**
+```c
+void print_relay_stats(nostr_relay_pool_t* pool, const char* relay_url) {
+    const nostr_relay_stats_t* stats = nostr_relay_pool_get_relay_stats(pool, relay_url);
+    
+    if (!stats) {
+        printf("No stats available for relay %s\n", relay_url);
+        return;
+    }
+    
+    printf("Statistics for %s:\n", relay_url);
+    printf("  Connection attempts: %d\n", stats->connection_attempts);
+    printf("  Connection failures: %d\n", stats->connection_failures);
+    printf("  Events received: %d\n", stats->events_received);
+    printf("  Events published: %d\n", stats->events_published);
+    printf("  Events published OK: %d\n", stats->events_published_ok);
+    printf("  Events published failed: %d\n", stats->events_published_failed);
+    printf("  Query latency avg: %.2f ms\n", stats->query_latency_avg);
+    printf("  Query samples: %d\n", stats->query_samples);
+    printf("  Publish latency avg: %.2f ms\n", stats->publish_latency_avg);
+    printf("  Publish samples: %d\n", stats->publish_samples);
+    
+    if (stats->last_event_time > 0) {
+        printf("  Last event: %ld seconds ago\n", 
+               time(NULL) - stats->last_event_time);
+    }
+}
+```
+
+### Reset Relay Statistics
+**Function:** [`nostr_relay_pool_reset_relay_stats()`](nostr_core/core_relay_pool.c:1008)
+```c
+int nostr_relay_pool_reset_relay_stats(
+    nostr_relay_pool_t* pool, 
+    const char* relay_url);
+```
+
+**Example:**
+```c
+void reset_stats_for_relay(nostr_relay_pool_t* pool, const char* relay_url) {
+    int result = nostr_relay_pool_reset_relay_stats(pool, relay_url);
+    
+    if (result == NOSTR_SUCCESS) {
+        printf("Successfully reset statistics for %s\n", relay_url);
+    } else {
+        printf("Failed to reset statistics for %s\n", relay_url);
+    }
+}
+```
+
+### Get Query Latency
+**Function:** [`nostr_relay_pool_get_relay_query_latency()`](nostr_core/core_relay_pool.c:1045)
+```c
+double nostr_relay_pool_get_relay_query_latency(
+    nostr_relay_pool_t* pool, 
+    const char* relay_url);
+```
+
+**Example:**
+```c
+void check_relay_performance(nostr_relay_pool_t* pool) {
+    const char* relays[] = {
+        "wss://relay.damus.io",
+        "wss://nos.lol",
+        "wss://relay.nostr.band"
+    };
+    
+    printf("Relay performance comparison:\n");
+    for (int i = 0; i < 3; i++) {
+        double latency = nostr_relay_pool_get_relay_query_latency(pool, relays[i]);
+        
+        if (latency >= 0) {
+            printf("  %s: %.2f ms average query latency\n", relays[i], latency);
+        } else {
+            printf("  %s: No latency data available\n", relays[i]);
+        }
+    }
+}
+```
+
+## Complete Example Application
+
+```c
+#include "nostr_core.h"
+#include "cjson/cJSON.h"
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+
+// Global context for the example
+typedef struct {
+    int event_count;
+    int max_events;
+} app_context_t;
+
+void on_text_note(cJSON* event, const char* relay_url, void* user_data) {
+    app_context_t* ctx = (app_context_t*)user_data;
+    
+    cJSON* content = cJSON_GetObjectItem(event, "content");
+    if (content && cJSON_IsString(content)) {
+        printf("[%s] Note #%d: %s\n", 
+               relay_url, ++ctx->event_count, cJSON_GetStringValue(content));
+    }
+}
+
+void on_subscription_complete(void* user_data) {
+    printf("All relays finished sending stored events\n");
+}
+
+int main() {
+    // Initialize pool
+    nostr_relay_pool_t* pool = nostr_relay_pool_create();
+    if (!pool) {
+        fprintf(stderr, "Failed to create relay pool\n");
+        return 1;
+    }
+    
+    // Add relays
+    const char* relays[] = {
+        "wss://relay.damus.io",
+        "wss://nos.lol"
+    };
+    
+    for (int i = 0; i < 2; i++) {
+        if (nostr_relay_pool_add_relay(pool, relays[i]) != NOSTR_SUCCESS) {
+            fprintf(stderr, "Failed to add relay: %s\n", relays[i]);
+        }
+    }
+    
+    // Create filter for recent text notes
+    cJSON* filter = cJSON_CreateObject();
+    cJSON* kinds = cJSON_CreateArray();
+    cJSON_AddItemToArray(kinds, cJSON_CreateNumber(1));
+    cJSON_AddItemToObject(filter, "kinds", kinds);
+    cJSON_AddItemToObject(filter, "limit", cJSON_CreateNumber(10));
+    
+    // Set up context
+    app_context_t ctx = {0, 10};
+    
+    // Subscribe
+    nostr_pool_subscription_t* sub = nostr_relay_pool_subscribe(
+        pool, relays, 2, filter, on_text_note, on_subscription_complete, &ctx);
+    
+    cJSON_Delete(filter);
+    
+    if (!sub) {
+        fprintf(stderr, "Failed to create subscription\n");
+        nostr_relay_pool_destroy(pool);
+        return 1;
+    }
+    
+    // Run event loop for 30 seconds
+    printf("Listening for events...\n");
+    nostr_relay_pool_run(pool, 30000);
+    
+    // Print final stats
+    for (int i = 0; i < 2; i++) {
+        print_relay_stats(pool, relays[i]);
+    }
+    
+    // Cleanup
+    nostr_pool_subscription_close(sub);
+    nostr_relay_pool_destroy(pool);
+    
+    printf("Application finished. Received %d events total.\n", ctx.event_count);
+    return 0;
+}
+```
+
+## Notes
+
+- All functions are **not thread-safe**. Use from a single thread or add external synchronization.
+- **Memory ownership**: The pool duplicates filters and URLs internally. Caller owns returned events and must free them.
+- **Event deduplication** is applied pool-wide using a circular buffer of 1000 event IDs.
+- **Ping functionality** is currently disabled in this build.
+- **NIP-42 behavior**: With [`nostr_relay_pool_set_auth()`](nostr_core/core_relay_pool.c:616) enabled, the pool will respond to relay `AUTH` challenges automatically using [`nostr_nip42_create_auth_event()`](nostr_core/nip042.c:26) and [`nostr_nip42_create_auth_message()`](nostr_core/nip042.c:84).
+- **Reconnection** happens on-demand when sending, but active subscriptions are not automatically re-sent after reconnect.
+- **Polling model**: You must drive the event loop via [`nostr_relay_pool_run()`](nostr_core/core_relay_pool.c:1745) or [`nostr_relay_pool_poll()`](nostr_core/core_relay_pool.c:1785) to receive events.
@@ -0,0 +1,603 @@
+# NOSTR Core Library
+
+A C library for NOSTR protocol implementation. Work in progress.
+
+[![Version](https://img.shields.io/badge/version-0.4.8-blue.svg)](VERSION)
+[![License](https://img.shields.io/badge/license-MIT-green.svg)](#license)
+[![Build Status](https://img.shields.io/badge/build-passing-brightgreen.svg)](#building)
+
+
+## 📋 NIP Implementation Status
+
+### Core Protocol NIPs
+- [x] [NIP-01](nips/01.md) - Basic protocol flow - event creation, signing, and validation
+- [ ] [NIP-02](nips/02.md) - Contact List and Petnames
+- [ ] [NIP-03](nips/03.md) - OpenTimestamps Attestations for Events
+- [x] [NIP-04](nips/04.md) - Encrypted Direct Messages (legacy)
+- [x] [NIP-05](nips/05.md) - Mapping Nostr keys to DNS-based internet identifiers
+- [x] [NIP-06](nips/06.md) - Basic key derivation from mnemonic seed phrase
+- [ ] [NIP-07](nips/07.md) - `window.nostr` capability for web browsers
+- [ ] [NIP-08](nips/08.md) - Handling Mentions
+- [ ] [NIP-09](nips/09.md) - Event Deletion
+- [ ] [NIP-10](nips/10.md) - Conventions for clients' use of `e` and `p` tags in text events
+- [x] [NIP-11](nips/11.md) - Relay Information Document
+- [ ] [NIP-12](nips/12.md) - Generic Tag Queries
+- [x] [NIP-13](nips/13.md) - Proof of Work
+- [ ] [NIP-14](nips/14.md) - Subject tag in text events
+- [ ] [NIP-15](nips/15.md) - Nostr Marketplace (for resilient marketplaces)
+- [ ] [NIP-16](nips/16.md) - Event Treatment
+- [x] [NIP-17](nips/17.md) - Private Direct Messages
+- [ ] [NIP-18](nips/18.md) - Reposts
+- [x] [NIP-19](nips/19.md) - bech32-encoded entities
+- [ ] [NIP-20](nips/20.md) - Command Results
+- [x] [NIP-21](nips/21.md) - `nostr:` URI scheme
+- [ ] [NIP-22](nips/22.md) - Event `created_at` Limits
+- [ ] [NIP-23](nips/23.md) - Long-form Content
+- [ ] [NIP-24](nips/24.md) - Extra metadata fields and tags
+- [ ] [NIP-25](nips/25.md) - Reactions
+- [ ] [NIP-26](nips/26.md) - Delegated Event Signing
+- [ ] [NIP-27](nips/27.md) - Text Note References
+- [ ] [NIP-28](nips/28.md) - Public Chat
+- [ ] [NIP-29](nips/29.md) - Relay-based Groups
+- [ ] [NIP-30](nips/30.md) - Custom Emoji
+- [ ] [NIP-31](nips/31.md) - Dealing with Unknown Events
+- [ ] [NIP-32](nips/32.md) - Labeling
+- [ ] [NIP-33](nips/33.md) - Parameterized Replaceable Events
+- [ ] [NIP-34](nips/34.md) - `git` stuff
+- [ ] [NIP-35](nips/35.md) - Torrents
+- [ ] [NIP-36](nips/36.md) - Sensitive Content / Content Warning
+- [ ] [NIP-37](nips/37.md) - Draft Events
+- [ ] [NIP-38](nips/38.md) - User Statuses
+- [ ] [NIP-39](nips/39.md) - External Identities in Profiles
+- [ ] [NIP-40](nips/40.md) - Expiration Timestamp
+- [x] [NIP-42](nips/42.md) - Authentication of clients to relays
+- [x] [NIP-44](nips/44.md) - Versioned Encryption
+- [ ] [NIP-45](nips/45.md) - Counting results
+- [x] [NIP-46](nips/46.md) - Nostr Remote Signing
+- [ ] [NIP-47](nips/47.md) - Wallet Connect
+- [ ] [NIP-48](nips/48.md) - Proxy Tags
+- [ ] [NIP-49](nips/49.md) - Private Key Encryption
+- [ ] [NIP-50](nips/50.md) - Search Capability
+- [ ] [NIP-51](nips/51.md) - Lists
+- [ ] [NIP-52](nips/52.md) - Calendar Events
+- [ ] [NIP-53](nips/53.md) - Live Activities
+- [ ] [NIP-54](nips/54.md) - Wiki
+- [ ] [NIP-55](nips/55.md) - Android Signer Application
+- [ ] [NIP-56](nips/56.md) - Reporting
+- [ ] [NIP-57](nips/57.md) - Lightning Zaps
+- [ ] [NIP-58](nips/58.md) - Badges
+- [x] [NIP-59](nips/59.md) - Gift Wrap
+- [ ] [NIP-60](nips/60.md) - Cashu Wallet
+- [ ] [NIP-61](nips/61.md) - Nutzaps
+- [ ] [NIP-62](nips/62.md) - Log events
+- [ ] [NIP-64](nips/64.md) - Chess (PGN)
+- [ ] [NIP-65](nips/65.md) - Relay List Metadata
+- [ ] [NIP-66](nips/66.md) - Relay Monitor
+- [ ] [NIP-68](nips/68.md) - Web badges
+- [ ] [NIP-69](nips/69.md) - Peer-to-peer Order events
+- [ ] [NIP-70](nips/70.md) - Protected Events
+- [ ] [NIP-71](nips/71.md) - Video Events
+- [ ] [NIP-72](nips/72.md) - Moderated Communities
+- [ ] [NIP-73](nips/73.md) - External Content IDs
+- [ ] [NIP-75](nips/75.md) - Zap Goals
+- [ ] [NIP-77](nips/77.md) - Arbitrary custom app data
+- [ ] [NIP-78](nips/78.md) - Application-specific data
+- [ ] [NIP-84](nips/84.md) - Highlights
+- [ ] [NIP-86](nips/86.md) - Relay Management API
+- [ ] [NIP-87](nips/87.md) - Relay List Recommendations
+- [ ] [NIP-88](nips/88.md) - Stella: A Stellar Relay
+- [ ] [NIP-89](nips/89.md) - Recommended Application Handlers
+- [ ] [NIP-90](nips/90.md) - Data Vending Machines
+- [ ] [NIP-92](nips/92.md) - Media Attachments
+- [ ] [NIP-94](nips/94.md) - File Metadata
+- [ ] [NIP-96](nips/96.md) - HTTP File Storage Integration
+- [ ] [NIP-98](nips/98.md) - HTTP Auth
+- [ ] [NIP-99](nips/99.md) - Classified Listings
+
+**Legend:** ✅ Fully Implemented | ⚠️ Partial Implementation | ❌ Not Implemented
+
+**Implementation Summary:** 13 of 96+ NIPs fully implemented (13.5%)
+
+
+## 📦 Quick Start
+
+### Installation
+
+1. **Clone the repository:**
+   ```bash
+   git clone https://github.com/yourusername/nostr_core_lib.git
+   cd nostr_core_lib
+   ```
+
+2. **Build the library:**
+   ```bash
+   ./build.sh
+   ```
+
+3. **Build and run examples:**
+   ```bash
+   ./build.sh -e
+   ./examples/simple_keygen
+   ```
+
+### Usage Example
+
+```c
+#include "nostr_core/nostr_core.h"
+#include <stdio.h>
+
+int main() {
+    // Initialize library
+    if (nostr_init() != NOSTR_SUCCESS) {
+        fprintf(stderr, "Failed to initialize NOSTR library\n");
+        return 1;
+    }
+    
+    // Generate keypair
+    unsigned char private_key[32], public_key[32];
+    nostr_generate_keypair(private_key, public_key);
+    
+    // Convert to bech32 format
+    char nsec[100], npub[100];
+    nostr_key_to_bech32(private_key, "nsec", nsec);
+    nostr_key_to_bech32(public_key, "npub", npub);
+    
+    printf("Private key: %s\n", nsec);
+    printf("Public key:  %s\n", npub);
+    
+    // Create and sign event
+    cJSON* event = nostr_create_and_sign_event(1, "Hello NOSTR!", NULL, private_key, 0);
+    if (event) {
+        char* json = cJSON_Print(event);
+        printf("Event: %s\n", json);
+        free(json);
+        cJSON_Delete(event);
+    }
+    
+    nostr_cleanup();
+    return 0;
+}
+```
+
+**Compile and run:**
+```bash
+gcc example.c -o example ./libnostr_core_x64.a -lz -ldl -lpthread -lm -lssl -lcrypto -lcurl -lsecp256k1
+./example
+```
+
+## 🏗️ Building
+
+### Build Targets
+
+```bash
+./build.sh                    # Build static library (default)
+./build.sh --nips=all         # Force build with all available NIPs
+./build.sh -t                 # Build all test executables in tests/
+./build.sh -e                 # Build all examples in examples/
+./build.sh -t -e              # Build library + tests + examples
+./build.sh --nips=46          # Build specifically with NIP-046 support
+./build.sh --help             # Show all options
+```
+
+### Dependencies
+
+**Required System Dependencies:**
+- GCC or compatible C compiler
+- Standard C library and math library (`-lm`)
+- OpenSSL development libraries (`-lssl -lcrypto`)
+- curl development libraries (`-lcurl`)
+- secp256k1 development libraries (`-lsecp256k1`)
+
+**Install on Ubuntu/Debian:**
+```bash
+sudo apt install build-essential libssl-dev libcurl4-openssl-dev libsecp256k1-dev
+```
+
+**Install on CentOS/RHEL:**
+```bash
+sudo yum install gcc openssl-devel libcurl-devel libsecp256k1-devel
+```
+
+**Install on macOS:**
+```bash
+brew install openssl curl secp256k1
+```
+
+**Still Bundled:**
+- cJSON (JSON parsing - internal copy)
+- TinyAES-c (AES encryption for NIP-04)
+- ChaCha20 (stream cipher for NIP-44)
+
+## 📚 API Documentation
+
+### Initialization
+```c
+int nostr_init(void);                    // Initialize library (call first)
+void nostr_cleanup(void);                // Cleanup resources (call last)
+const char* nostr_strerror(int error);   // Get error message
+```
+
+### Key Management
+```c
+// Generate random keypair
+int nostr_generate_keypair(unsigned char* private_key, unsigned char* public_key);
+
+// Generate from mnemonic
+int nostr_generate_mnemonic_and_keys(char* mnemonic, size_t mnemonic_size, 
+                                     int account, unsigned char* private_key, 
+                                     unsigned char* public_key);
+
+// Derive from existing mnemonic
+int nostr_derive_keys_from_mnemonic(const char* mnemonic, int account,
+                                    unsigned char* private_key, unsigned char* public_key);
+
+// Format conversion
+int nostr_key_to_bech32(const unsigned char* key, const char* hrp, char* output);
+nostr_input_type_t nostr_detect_input_type(const char* input);
+```
+
+### Event Creation
+```c
+// Create and sign event
+cJSON* nostr_create_and_sign_event(int kind, const char* content, cJSON* tags, 
+                                   const unsigned char* private_key, time_t timestamp);
+
+// Add proof of work
+int nostr_add_proof_of_work(cJSON* event, const unsigned char* private_key, 
+                           int target_difficulty, void (*progress_callback)(...), void* user_data);
+```
+
+### Encryption (NIP-04 & NIP-44)
+```c
+// NIP-04 (AES-CBC)
+int nostr_nip04_encrypt(const unsigned char* sender_private_key,
+                       const unsigned char* recipient_public_key, 
+                       const char* plaintext, char* output, size_t output_size);
+
+int nostr_nip04_decrypt(const unsigned char* recipient_private_key,
+                       const unsigned char* sender_public_key,
+                       const char* encrypted_data, char* output, size_t output_size);
+
+// NIP-44 (ChaCha20)  
+int nostr_nip44_encrypt(const unsigned char* sender_private_key,
+                       const unsigned char* recipient_public_key,
+                       const char* plaintext, char* output, size_t output_size);
+
+int nostr_nip44_decrypt(const unsigned char* recipient_private_key,
+                       const unsigned char* sender_public_key,
+                       const char* encrypted_data, char* output, size_t output_size);
+```
+
+### Relay Communication
+```c
+// Simple relay query
+cJSON* nostr_query_relay_for_event(const char* relay_url, const char* pubkey_hex, int kind);
+
+// Multi-relay synchronous queries
+cJSON** synchronous_query_relays_with_progress(const char** relay_urls, int relay_count,
+                                               cJSON* filter, relay_query_mode_t mode,
+                                               int* result_count, int relay_timeout_seconds,
+                                               relay_progress_callback_t callback, void* user_data);
+
+// Multi-relay publishing
+publish_result_t* synchronous_publish_event_with_progress(const char** relay_urls, int relay_count,
+                                                         cJSON* event, int* success_count,
+                                                         int relay_timeout_seconds,
+                                                         publish_progress_callback_t callback, void* user_data);
+```
+
+### Relay Pools (Asynchronous)
+```c
+// Create and manage relay pool with reconnection
+nostr_pool_reconnect_config_t* config = nostr_pool_reconnect_config_default();
+nostr_relay_pool_t* nostr_relay_pool_create(nostr_pool_reconnect_config_t* config);
+int nostr_relay_pool_add_relay(nostr_relay_pool_t* pool, const char* relay_url);
+int nostr_relay_pool_set_auth(nostr_relay_pool_t* pool, const unsigned char* private_key, int enable);
+void nostr_relay_pool_destroy(nostr_relay_pool_t* pool);
+
+// Subscribe to events (with auto-reconnection)
+nostr_pool_subscription_t* nostr_relay_pool_subscribe(
+    nostr_relay_pool_t* pool, const char** relay_urls, int relay_count, cJSON* filter,
+    void (*on_event)(cJSON* event, const char* relay_url, void* user_data),
+    void (*on_eose)(void* user_data), void* user_data, int close_on_eose);
+
+// Enable NIP-42 auth (auto-responds to relay AUTH challenges)
+unsigned char private_key[32];
+nostr_hex_to_bytes("91ba716fa9e7ea2fcbad360cf4f8e0d312f73984da63d90f524ad61a6a1e7dbe", private_key, 32);
+nostr_relay_pool_set_auth(pool, private_key, 1);
+
+// Run event loop (handles reconnection + incoming AUTH/NOTICE/OK messages)
+int nostr_relay_pool_run(nostr_relay_pool_t* pool, int timeout_ms);
+int nostr_relay_pool_poll(nostr_relay_pool_t* pool, int timeout_ms);
+
+// Reconnection configuration
+typedef struct {
+    int enable_auto_reconnect;        // Enable automatic reconnection
+    int max_reconnect_attempts;       // Maximum retry attempts
+    int initial_reconnect_delay_ms;   // Initial delay between attempts
+    int max_reconnect_delay_ms;       // Maximum delay cap
+    int reconnect_backoff_multiplier; // Exponential backoff factor
+    int ping_interval_seconds;        // Health check ping interval
+    int pong_timeout_seconds;         // Pong response timeout
+} nostr_pool_reconnect_config_t;
+```
+
+### NIP-05 Identifier Verification
+```c
+// Lookup public key from NIP-05 identifier
+int nostr_nip05_lookup(const char* nip05_identifier, char* pubkey_hex_out,
+                       char*** relays, int* relay_count, int timeout_seconds);
+
+// Verify NIP-05 identifier against public key
+int nostr_nip05_verify(const char* nip05_identifier, const char* pubkey_hex, 
+                       char*** relays, int* relay_count, int timeout_seconds);
+
+// Parse .well-known/nostr.json response
+int nostr_nip05_parse_well_known(const char* json_response, const char* local_part,
+                                 char* pubkey_hex_out, char*** relays, int* relay_count);
+```
+
+### NIP-11 Relay Information
+```c
+// Fetch relay information document
+int nostr_nip11_fetch_relay_info(const char* relay_url, nostr_relay_info_t** info_out, int timeout_seconds);
+
+// Free relay information structure
+void nostr_nip11_relay_info_free(nostr_relay_info_t* info);
+```
+
+## 📁 Examples
+
+The library includes comprehensive examples:
+
+- **`simple_keygen`** - Basic key generation and formatting
+- **`keypair_generation`** - Advanced key management
+- **`mnemonic_generation`** - BIP39 mnemonic handling
+- **`mnemonic_derivation`** - NIP-06 key derivation
+- **`utility_functions`** - General utility demonstrations
+- **`input_detection`** - Input type detection and processing
+- **`relay_pool`** - Interactive relay pool and subscription testing
+- **`send_nip17_dm`** - NIP-17 private direct message send flow
+- **`nip46_remote_signer`** - NIP-46 remote signer flow and bunker URL generation
+- **`version_test`** - Library version information
+
+Build all examples:
+```bash
+./build.sh -e
+ls -la examples/
+```
+
+## 🧪 Testing
+
+The library includes extensive tests:
+
+```bash
+# Build all test executables
+./build.sh -t
+
+# Run the new NIP-46 test
+./tests/nip46_test
+
+# Run selected tests
+./tests/nip44_test
+./tests/nip42_test
+./tests/nip17_test
+```
+
+**Current test binaries live in [`tests/`](tests/) and are generated from `*_test.c` sources.**
+
+## 🏗️ Integration
+
+### Static Library Integration (Recommended)
+
+1. **Install system dependencies first** (see Dependencies section above)
+
+2. **Copy required files to your project:**
+   ```bash
+   cp libnostr_core_x64.a /path/to/your/project/
+   cp nostr_core/nostr_core.h /path/to/your/project/
+   ```
+
+3. **Link in your project:**
+   ```bash
+   gcc your_code.c -L. -lnostr_core -lssl -lcrypto -lcurl -lsecp256k1 -lm -o your_program
+   ```
+
+### Source Integration
+
+1. **Install system dependencies first** (see Dependencies section above)
+
+2. **Copy source files:**
+   ```bash
+   cp -r nostr_core/ /path/to/your/project/
+   cp -r cjson/ /path/to/your/project/
+   ```
+
+3. **Include in your build:**
+   ```bash
+   gcc your_code.c nostr_core/*.c cjson/cJSON.c -lssl -lcrypto -lcurl -lsecp256k1 -lm -o your_program
+   ```
+
+### System Dependencies Library
+
+The `libnostr_core.a` library now uses **system dependencies** for all major crypto libraries:
+
+- ✅ **Uses system OpenSSL** (`-lssl -lcrypto`)
+- ✅ **Uses system curl** (`-lcurl`) 
+- ✅ **Uses system secp256k1** (`-lsecp256k1`)
+- ✅ **Includes only internal code** (cJSON, TinyAES, ChaCha20)
+
+**Complete linking example:**
+```bash
+gcc your_app.c ./libnostr_core_x64.a -lz -ldl -lpthread -lm -lssl -lcrypto -lcurl -lsecp256k1 -o your_app
+```
+
+**Check system dependencies:**
+```bash
+ldd your_app  # Shows linked system libraries
+```
+
+## 🔧 Configuration
+
+### Compile-Time Options
+
+```c
+// Enable debug output
+#define NOSTR_DEBUG_ENABLED
+
+// Crypto-only build (no networking)
+#define NOSTR_CRYPTO_ONLY
+
+// Enable specific NIPs
+#define NOSTR_NIP04_ENABLED
+#define NOSTR_NIP44_ENABLED
+#define NOSTR_NIP13_ENABLED
+```
+
+### Build Flags
+
+```bash
+# Enable websocket and PoW debug emission (now callback-based)
+make LOGGING_FLAGS="-DENABLE_WEBSOCKET_LOGGING -DENABLE_DEBUG_LOGGING"
+
+# Debug build
+make debug
+
+# ARM64 cross-compile
+make arm64
+```
+
+### Logging Integration (Consumer-Controlled)
+
+`nostr_core_lib` now supports a callback logging API so host applications can route library logs into their own logger and destination.
+
+- API is exposed via [`nostr_core/nostr_log.h`](nostr_core/nostr_log.h)
+- Included automatically from [`nostr_core/nostr_core.h`](nostr_core/nostr_core.h)
+
+```c
+#include "nostr_core/nostr_core.h"
+
+static void my_log_cb(int level, const char* component, const char* message, void* user_data) {
+    (void)user_data;
+    fprintf(stderr, "[nostr][%s][%d] %s\n", component ? component : "unknown", level, message ? message : "");
+}
+
+int main(void) {
+    if (nostr_init() != NOSTR_SUCCESS) return 1;
+
+    nostr_set_log_callback(my_log_cb, NULL);
+    nostr_set_log_level(NOSTR_LOG_LEVEL_TRACE);
+
+    /* ... your code ... */
+
+    nostr_cleanup();
+    return 0;
+}
+```
+
+#### Migration Notes
+
+- Direct file logging to `debug.log` has been removed from websocket and NIP-13 internals.
+- To receive logs, register a callback with [`nostr_set_log_callback()`](nostr_core/nostr_log.h:24).
+- Use [`nostr_set_log_level()`](nostr_core/nostr_log.h:25) to reduce verbosity in production.
+
+## 🌐 Supported Platforms
+
+- **Linux** (x86_64, ARM64)
+- **macOS** (Intel, Apple Silicon)
+- **Windows** (MinGW, MSYS2)
+- **Embedded Systems** (resource-constrained environments)
+
+## 📄 Documentation
+
+- **[POOL_API.md](POOL_API.md)** - Relay pool API notes
+- **[nostr_websocket/README.md](nostr_websocket/README.md)** - WebSocket module details
+- **[nostr_websocket/EXPORT_GUIDE.md](nostr_websocket/EXPORT_GUIDE.md)** - WebSocket export instructions
+- **API Reference** - Complete documentation in [`nostr_core/nostr_core.h`](nostr_core/nostr_core.h)
+
+## 🤝 Contributing
+
+1. Fork the repository
+2. Create a feature branch: `git checkout -b feature/amazing-feature`
+3. Make your changes and add tests
+4. Build tests and run key suites: `./build.sh -t && ./tests/nip46_test`
+5. Commit your changes: `git commit -m 'Add amazing feature'`
+6. Push to the branch: `git push origin feature/amazing-feature`
+7. Open a Pull Request
+
+## 📈 Version History
+
+Current version: **0.4.8**
+
+The library uses automatic semantic versioning based on Git tags. Each build increments the patch version automatically.
+
+**Recent Developments:**
+- **OpenSSL Migration**: Transitioned from mbedTLS to OpenSSL for improved compatibility
+- **NIP-05 Support**: DNS-based internet identifier verification
+- **NIP-11 Support**: Relay information document fetching and parsing
+- **NIP-19 Support**: Bech32-encoded entities (nsec/npub)
+- **Enhanced WebSocket**: OpenSSL-based TLS WebSocket communication
+- **Comprehensive Testing**: Extensive test suite and error handling
+
+**Version Timeline:**
+- `v0.4.x` - Current development releases with relay pool and expanded NIP support
+- `v0.2.x` - Earlier OpenSSL-based development releases
+- `v0.1.x` - Initial development releases
+- Focus on core protocol implementation and OpenSSL-based crypto
+- Full NIP-01, NIP-04, NIP-05, NIP-06, NIP-11, NIP-13, NIP-17, NIP-19, NIP-21, NIP-42, NIP-44, NIP-46, NIP-59 support
+
+## 🐛 Troubleshooting
+
+### Common Issues
+
+**Build fails with secp256k1 errors:**
+```bash
+# Install secp256k1 with Schnorr support
+sudo apt install libsecp256k1-dev    # Ubuntu/Debian
+# or
+sudo yum install libsecp256k1-devel  # CentOS/RHEL
+# or
+brew install secp256k1               # macOS
+
+# If still failing, build from source with Schnorr support:
+git clone https://github.com/bitcoin-core/secp256k1.git
+cd secp256k1
+./autogen.sh
+./configure --enable-module-schnorrsig --enable-module-ecdh
+make
+sudo make install
+```
+
+**Library size:**
+The library is small (~500KB) as it links against system libraries (secp256k1, OpenSSL, curl) rather than including them statically. This keeps the binary size manageable while maintaining full functionality.
+
+**Linking errors:**
+Make sure to include the math library:
+```bash
+gcc your_code.c ./libnostr_core_x64.a -lz -ldl -lpthread -lm -lssl -lcrypto -lcurl -lsecp256k1
+```
+
+### Getting Help
+
+- Check the `examples/` directory for working code
+- Run `./build.sh test` to verify your environment
+- Review the comprehensive API documentation in `nostr_core/nostr_core.h`
+
+## 📜 License
+
+This project is licensed under the MIT License - see the [LICENSE](LICENSE) file for details.
+
+## 🙏 Acknowledgments
+
+- **NOSTR Protocol** - The decentralized social media protocol
+- **OpenSSL** - Production-grade cryptographic library and TLS implementation
+- **secp256k1** - Bitcoin's elliptic curve library
+- **cJSON** - Lightweight JSON parser
+- **curl** - HTTP/HTTPS client library for NIP-05/NIP-11
+- **NOSTR Community** - For protocol specification and feedback
+
+---
+
+**Built with ❤️ for the decentralized web**
+
+*OpenSSL-based • Minimal dependencies • Work in progress*
@@ -1 +1 @@
-1.0.157
+0.5.0
@@ -1,122 +0,0 @@
-# Version Management System
-
-This project implements an automated version management system for C applications with auto-incrementing build numbers.
-
-## Overview
-
-The version management system consists of:
- **Semantic versioning** (Major.Minor.Patch) in `VERSION` file
- **Auto-incrementing build numbers** in `.build_number` file
- **Generated version header** (`version.h`) with all version info
- **Build-time integration** via `scripts/generate_version.sh`
-
-## Files
-
-### Core Files
- `VERSION` - Contains semantic version (e.g., "1.0.0")
- `.build_number` - Contains current build number (auto-incremented)
- `scripts/generate_version.sh` - Version generation script
- `version.h` - Generated header (auto-created, do not edit)
-
-### Integration Files
- `build.sh` - Modified to call version generation
- `.gitignore` - Excludes generated `version.h`
-
-## Usage
-
-### Building
-Every time you run `./build.sh`, the build number automatically increments:
-
-```bash
-./build.sh  # Build #1
-./build.sh  # Build #2
-./build.sh  # Build #3
-```
-
-### Version Display
-The application shows version information in multiple ways:
-
-**Command Line:**
-```bash
-./build/c_nostr --version
-./build/c_nostr -v
-```
-
-**Interactive Mode:**
- ASCII art title with version
- Header shows: `NOSTR TERMINAL v1.0.0 (Build #3, 2025-07-21)`
-
-### Updating Semantic Version
-To update the major/minor/patch version:
-
-```bash
-echo "1.1.0" > VERSION
-```
-
-The next build will be `v1.1.0 (Build #4)`.
-
-## Generated Macros
-
-The `version.h` file contains these macros:
-
-```c
-#define VERSION_MAJOR 1
-#define VERSION_MINOR 0
-#define VERSION_PATCH 0
-#define VERSION_BUILD 3
-#define VERSION_STRING "1.0.0"
-#define VERSION_FULL "1.0.0.3"
-#define BUILD_NUMBER 3
-#define BUILD_DATE "2025-07-21"
-#define BUILD_TIME "14:53:32"
-#define BUILD_TIMESTAMP "2025-07-21 14:53:32"
-#define GIT_HASH ""
-#define GIT_BRANCH ""
-#define VERSION_DISPLAY "v1.0.0 (Build #3)"
-#define VERSION_FULL_DISPLAY "v1.0.0 (Build #3, 2025-07-21)"
-```
-
-## Integration in Code
-
-Include the version header:
-```c
-#include "version.h"
-```
-
-Use version macros:
-```c
-printf("NOSTR TERMINAL %s\n", VERSION_FULL_DISPLAY);
-printf("Built: %s\n", BUILD_TIMESTAMP);
-```
-
-## Best Practices
-
-1. **Never edit `version.h`** - it's auto-generated
-2. **Commit `.build_number`** - tracks build history
-3. **Update `VERSION` manually** - for semantic version changes
-4. **Build increments automatically** - no manual intervention needed
-
-## Version History
-
-Build numbers are persistent and increment across sessions:
- Build #1: Initial implementation
- Build #2: First rebuild test
- Build #3: Added --version flag
- Build #4: Next build...
-
-## ASCII Art Integration
-
-The version system integrates with the ASCII art title display:
-
-```
-███    ██          ██████  ███████         ████████ ███████ ██████  
-████   ██         ██    ██ ██                 ██    ██      ██   ██ 
-██ ██  ██         ██    ██ ███████            ██    █████   ██████  
-██  ██ ██         ██    ██      ██            ██    ██      ██   ██ 
-██   ████ ███████  ██████  ███████ ███████    ██    ███████ ██   ██ 
-
-NOSTR TERMINAL v1.0.0 (Build #3, 2025-07-21) - user_abc123
-================================================================
-```
-
-This provides a professional, branded experience with clear version identification.
@@ -1,116 +0,0 @@
-# Compiler Warning Cleanup - SUCCESS REPORT
-
-## 🎉 All Warnings Resolved!
-
-The nostr_core_lib now compiles with **zero compiler warnings** using `-Wall -Wextra` flags.
-
-## ✅ Fixed Issues Summary
-
-### 1. **Type Limits Warning** - `nostr_core/core.c`
- **Issue**: `comparison is always false due to limited range of data type [-Wtype-limits]`
- **Location**: `bech32_decode()` function, line 791
- **Problem**: Comparing `char c < 0` when `char` might be unsigned
- **Fix**: Changed `char c` to `unsigned char c` and removed redundant comparison
- **Status**: ✅ RESOLVED
-
-### 2. **Unused Parameter Warning** - `nostr_core/nostr_crypto.c`
- **Issue**: `unused parameter 'mnemonic_size' [-Wunused-parameter]`
- **Location**: `nostr_bip39_mnemonic_from_bytes()` function
- **Problem**: Function parameter was declared but never used
- **Fix**: Removed `mnemonic_size` parameter from function signature and all call sites
- **Files Updated**: 
-  - `nostr_core/nostr_crypto.c` (function implementation)
-  - `nostr_core/nostr_crypto.h` (function declaration)
-  - `nostr_core/core.c` (function call site)
- **Status**: ✅ RESOLVED
-
-### 3. **Unused Constant Variable** - `nostr_core/nostr_crypto.c`
- **Issue**: `'CURVE_N' defined but not used [-Wunused-const-variable=]`
- **Location**: Line 456
- **Problem**: Constant array was defined but never referenced
- **Fix**: Removed the unused `CURVE_N` constant definition
- **Status**: ✅ RESOLVED
-
-### 4. **Unused Variables** - `nostr_websocket/nostr_websocket_mbedtls.c`
- **Issue 1**: `unused variable 'tcp' [-Wunused-variable]` in `tcp_cleanup()`
- **Issue 2**: `unused variable 'fin' [-Wunused-variable]` in `ws_receive_frame()`
- **Fix**: Removed both unused variable declarations
- **Status**: ✅ RESOLVED
-
-### 5. **Sign Comparison Warnings** - `nostr_websocket/nostr_websocket_mbedtls.c`
- **Issue**: `comparison of integer expressions of different signedness [-Wsign-compare]`
- **Locations**: 
-  - `ws_parse_url()` - `path_start - url` vs `strlen(url)`
-  - `ws_perform_handshake()` - `len` vs `sizeof(request)`
-  - `ws_perform_handshake()` - `total_received` vs `sizeof(response) - 1`
- **Fix**: Added explicit casts to `size_t` for signed integers before comparison
- **Status**: ✅ RESOLVED
-
-### 6. **Unused Function Warning** - `nostr_websocket/nostr_websocket_mbedtls.c`
- **Issue**: `'debug_log_cleanup' defined but not used [-Wunused-function]`
- **Problem**: Function was defined but never called
- **Fix**: Removed the unused function and its forward declaration
- **Status**: ✅ RESOLVED
-
-## 🧪 Verification Results
-
-### Clean Build Test
-```bash
-make clean && make
-```
-**Result**: ✅ **ZERO WARNINGS** - Clean compilation
-
-### Functionality Test
-```bash
-make examples && ./examples/simple_keygen
-```
-**Result**: ✅ **ALL EXAMPLES WORK** - Library functionality preserved
-
-## 📊 Before vs After
-
-### Before Cleanup:
-```
-Compiling: nostr_core/core.c
-nostr_core/core.c:791:24: warning: comparison is always false due to limited range of data type [-Wtype-limits]
-
-Compiling: nostr_core/nostr_crypto.c
-nostr_core/nostr_crypto.c:901:59: warning: unused parameter 'mnemonic_size' [-Wunused-parameter]
-nostr_core/nostr_crypto.c:456:23: warning: 'CURVE_N' defined but not used [-Wunused-const-variable=]
-
-Compiling: nostr_websocket/nostr_websocket_mbedtls.c
-nostr_websocket/nostr_websocket_mbedtls.c:485:22: warning: unused variable 'tcp' [-Wunused-variable]
-nostr_websocket/nostr_websocket_mbedtls.c:760:40: warning: operand of '?:' changes signedness [-Wsign-compare]
-nostr_websocket/nostr_websocket_mbedtls.c:807:13: warning: comparison of integer expressions of different signedness [-Wsign-compare]
-nostr_websocket/nostr_websocket_mbedtls.c:824:27: warning: comparison of integer expressions of different signedness [-Wsign-compare]
-nostr_websocket/nostr_websocket_mbedtls.c:919:13: warning: unused variable 'fin' [-Wunused-variable]
-nostr_websocket/nostr_websocket_mbedtls.c:1024:13: warning: 'debug_log_cleanup' defined but not used [-Wunused-function]
-
-Total: 9 warnings
-```
-
-### After Cleanup:
-```
-Compiling: nostr_core/core.c
-Compiling: nostr_core/core_relays.c
-Compiling: nostr_core/nostr_crypto.c
-Compiling: nostr_core/nostr_secp256k1.c
-Compiling: cjson/cJSON.c
-Compiling: nostr_websocket/nostr_websocket_mbedtls.c
-Creating static library: libnostr_core.a
-
-Total: 0 warnings ✅
-```
-
-## 🎯 Benefits Achieved
-
-1. **Professional Code Quality**: Clean compilation with strict compiler flags
-2. **Maintainability**: Removed unused code reduces confusion for future developers
-3. **Portability**: Fixed sign comparison issues improve cross-platform compatibility
-4. **Performance**: Compiler can better optimize warning-free code
-5. **Debugging**: Cleaner build output makes real issues more visible
-
-## 🏆 Final Status: **COMPLETE SUCCESS**
-
-The nostr_core_lib now compiles cleanly with zero warnings while maintaining full functionality. All examples continue to work correctly, demonstrating that the cleanup did not introduce any regressions.
-
-**Mission Accomplished!** 🚀
@@ -1,161 +1,746 @@
 #!/bin/bash

-# NOSTR Core Library Build Script
-# Provides convenient build targets for the standalone library
+# NOSTR Core Library - Customer Build Script with Auto-Detection
+# Automatically detects which NIPs are needed based on #include statements

-set -e  # Exit on any error
+set -e  # Exit on error

-# Colors for output
-RED='\033[0;31m'
-GREEN='\033[0;32m'
-YELLOW='\033[1;33m'
-BLUE='\033[0;34m'
-NC='\033[0m' # No Color
+# Color constants
+RED='\033[31m'
+GREEN='\033[32m'
+YELLOW='\033[33m'
+BLUE='\033[34m'
+BOLD='\033[1m'
+RESET='\033[0m'

-# Function to print colored output
-print_status() {
-    echo -e "${BLUE}[INFO]${NC} $1"
+# Detect if we should use colors (terminal output and not piped)
+USE_COLORS=true
+if [ ! -t 1 ] || [ "$NO_COLOR" = "1" ]; then
+    USE_COLORS=false
+fi
+
+# Function to print output with colors
+print_info() {
+    if [ "$USE_COLORS" = true ]; then
+        echo -e "${BLUE}[INFO]${RESET} $1"
+    else
+        echo "[INFO] $1"
+    fi
 }

 print_success() {
-    echo -e "${GREEN}[SUCCESS]${NC} $1"
+    if [ "$USE_COLORS" = true ]; then
+        echo -e "${GREEN}${BOLD}[SUCCESS]${RESET} $1"
+    else
+        echo "[SUCCESS] $1"
+    fi
 }

 print_warning() {
-    echo -e "${YELLOW}[WARNING]${NC} $1"
+    if [ "$USE_COLORS" = true ]; then
+        echo -e "${YELLOW}[WARNING]${RESET} $1"
+    else
+        echo "[WARNING] $1"
+    fi
 }

 print_error() {
-    echo -e "${RED}[ERROR]${NC} $1"
+    if [ "$USE_COLORS" = true ]; then
+        echo -e "${RED}${BOLD}[ERROR]${RESET} $1"
+    else
+        echo "[ERROR] $1"
+    fi
 }

-# Function to show usage
-show_usage() {
-    echo "NOSTR Core Library Build Script"
-    echo "==============================="
-    echo ""
-    echo "Usage: $0 [target]"
-    echo ""
-    echo "Available targets:"
-    echo "  clean       - Clean all build artifacts"
-    echo "  lib         - Build static library (default)"
-    echo "  shared      - Build shared library"
-    echo "  all         - Build both static and shared libraries"
-    echo "  examples    - Build example programs"
-    echo "  test        - Run tests"
-    echo "  install     - Install library to system"
-    echo "  uninstall   - Remove library from system"
-    echo "  help        - Show this help message"
-    echo ""
-    echo "Library outputs:"
-    echo "  libnostr_core.a       - Static library"
-    echo "  libnostr_core.so      - Shared library"
-    echo "  examples/*            - Example programs"
-}
+# Default values
+ARCHITECTURE=""
+FORCE_NIPS=""
+VERBOSE=false
+HELP=false
+BUILD_TESTS=false
+BUILD_EXAMPLES=false
+NO_COLOR_FLAG=false

 # Parse command line arguments
-TARGET=${1:-lib}
+while [[ $# -gt 0 ]]; do
+    case $1 in
+        x64|x86_64|amd64)
+            ARCHITECTURE="x64"
+            shift
+            ;;
+        arm64|aarch64)
+            ARCHITECTURE="arm64"
+            shift
+            ;;
+        --nips=*)
+            FORCE_NIPS="${1#*=}"
+            shift
+            ;;
+        --verbose|-v)
+            VERBOSE=true
+            shift
+            ;;
+        --tests|-t)
+            BUILD_TESTS=true
+            shift
+            ;;
+        --examples|-e)
+            BUILD_EXAMPLES=true
+            shift
+            ;;
+        --no-color)
+            NO_COLOR_FLAG=true
+            shift
+            ;;
+        --help|-h)
+            HELP=true
+            shift
+            ;;
+        *)
+            print_error "Unknown argument: $1"
+            HELP=true
+            shift
+            ;;
+    esac
+done

-case "$TARGET" in
-    clean)
-        print_status "Cleaning build artifacts..."
-        make clean
-        print_success "Clean completed"
-        ;;
-        
-    lib|library)
-        print_status "Building static library..."
-        make clean
-        make
-        if [ -f "libnostr_core.a" ]; then
-            SIZE=$(stat -c%s "libnostr_core.a")
-            print_success "Static library built successfully (${SIZE} bytes)"
-            ls -la libnostr_core.a
-        else
-            print_error "Failed to build static library"
-            exit 1
-        fi
-        ;;
-        
-    shared)
-        print_status "Building shared library..."
-        make clean
-        make libnostr_core.so
-        if [ -f "libnostr_core.so" ]; then
-            SIZE=$(stat -c%s "libnostr_core.so")
-            print_success "Shared library built successfully (${SIZE} bytes)"
-            ls -la libnostr_core.so
-        else
-            print_error "Failed to build shared library"
-            exit 1
-        fi
-        ;;
-        
-    all)
-        print_status "Building all libraries..."
-        make clean
-        make all
-        print_success "All libraries built successfully"
-        ls -la libnostr_core.*
-        ;;
-        
-    examples)
-        print_status "Building examples..."
-        make clean
-        make
-        make examples
-        print_success "Examples built successfully"
-        ls -la examples/
-        ;;
-        
-    test)
-        print_status "Running tests..."
-        make clean
-        make
-        if make test-crypto 2>/dev/null; then
-            print_success "All tests passed"
-        else
-            print_warning "Running simple test instead..."
-            make test
-            print_success "Basic test completed"
-        fi
-        ;;
-        
-    tests)
-        print_status "Running tests..."
-        make clean
-        make
-        if make test-crypto 2>/dev/null; then
-            print_success "All tests passed"
-        else
-            print_warning "Running simple test instead..."
-            make test
-            print_success "Basic test completed"
-        fi
-        ;;
+# Apply no-color flag
+if [ "$NO_COLOR_FLAG" = true ]; then
+    USE_COLORS=false
+fi

-    install)
-        print_status "Installing library to system..."
-        make clean
-        make all
-        sudo make install
-        print_success "Library installed to /usr/local"
-        ;;
+# Show help
+if [ "$HELP" = true ]; then
+    echo "NOSTR Core Library - Customer Build Script"
+    echo ""
+    echo "Usage: $0 [architecture] [options]"
+    echo ""
+    echo "Architectures:"
+    echo "  x64, x86_64, amd64    Build for x86-64 architecture"
+    echo "  arm64, aarch64        Build for ARM64 architecture"
+    echo "  (default)             Build for current architecture"
+    echo ""
+    echo "Options:"
+    echo "  --nips=1,5,6,19       Force specific NIPs (comma-separated)"
+    echo "  --nips=all            Include all available NIPs"
+    echo "  --tests, -t           Build all test programs in tests/ directory"
+    echo "  --examples, -e        Build all example programs in examples/ directory"
+    echo "  --verbose, -v         Verbose output"
+    echo "  --no-color            Disable colored output"
+    echo "  --help, -h            Show this help"
+    echo ""
+    echo "Auto-Detection:"
+    echo "  Script automatically scans your .c files for #include statements"
+    echo "  like #include \"nip001.h\" and compiles only needed NIPs."
+    echo ""
+    echo "Available NIPs:"
+    echo "  001 - Basic Protocol (event creation, signing)"
+    echo "  004 - Encryption (legacy)"
+    echo "  005 - DNS-based identifiers"
+    echo "  006 - Key derivation from mnemonic"
+    echo "  011 - Relay information document"
+    echo "  013 - Proof of Work"
+    echo "  017 - Private Direct Messages"
+    echo "  019 - Bech32 encoding (nsec/npub)"
+    echo "  021 - nostr: URI scheme"
+    echo "  042 - Authentication of clients to relays"
+    echo "  044 - Encryption (modern)"
+    echo "  046 - Remote signing"
+    echo "  059 - Gift Wrap"
+    echo "  060 - Cashu Wallet"
+    echo "  061 - Nutzaps"
+    echo ""
+    echo "Examples:"
+    echo "  $0                    # Auto-detect NIPs, build for current arch"
+    echo "  $0 x64                # Auto-detect NIPs, build for x64"
+    echo "  $0 --nips=1,6,19      # Force NIPs 1,6,19 only"
+    echo "  $0 arm64 --nips=all   # Build all NIPs for ARM64"
+    echo "  $0 -t                 # Build library and all tests"
+    exit 0
+fi
+
+print_info "NOSTR Core Library - Customer Build Script"
+
+# Check if we're running from the correct directory
+CURRENT_DIR=$(basename "$(pwd)")
+if [ "$CURRENT_DIR" != "nostr_core_lib" ]; then
+    print_error "Build script must be run from the nostr_core_lib directory"
+    echo ""
+    echo "Current directory: $CURRENT_DIR"
+    echo "Expected directory: nostr_core_lib"
+    echo ""
+    echo "Please change to the nostr_core_lib directory first, then run the build script."
+    echo ""
+    echo "Correct usage:"
+    echo "  cd nostr_core_lib"
+    echo "  ./build.sh"
+    echo ""
+    echo "Or if nostr_core_lib is in your project directory:"
+    echo "  cd nostr_core_lib"
+    echo "  ./build.sh"
+    echo "  cd .."
+    echo "  gcc your_app.c nostr_core_lib/libnostr_core_x64.a -lz -ldl -lpthread -lm -lssl -lcrypto -lcurl -lsecp256k1 -o your_app"
+    echo ""
+    exit 1
+fi
+
+print_info "Auto-detecting needed NIPs from your source code..."
+
+
+###########################################################################################
+###########################################################################################
+############  AUTODETECT NIPS FROM SOURCE FILES
+###########################################################################################
+###########################################################################################
+
+
+NEEDED_NIPS=""
+if [ -n "$FORCE_NIPS" ]; then
+    if [ "$FORCE_NIPS" = "all" ]; then
+        NEEDED_NIPS="001 004 005 006 011 013 017 019 042 044 046 059 060 061"
+        print_info "Forced: Building all available NIPs"
+    else
+        # Convert comma-separated list to space-separated with 3-digit format
+        NEEDED_NIPS=$(echo "$FORCE_NIPS" | tr ',' ' ' | sed 's/\b\([0-9]\)\b/00\1/g' | sed 's/\b\([0-9][0-9]\)\b/0\1/g')
+        print_info "Forced NIPs: $NEEDED_NIPS"
+    fi
+else
+    # Auto-detect from .c files in current directory
+    if ls *.c >/dev/null 2>&1; then
+        # Scan for nip*.h includes (with or without nostr_core/ prefix)
+        DETECTED=$(grep -h '#include[[:space:]]*["\<]\(nostr_core/\)\?nip[0-9][0-9][0-9]\.h["\>]' *.c 2>/dev/null | \
+                  sed 's/.*nip0*\([0-9]*\)\.h.*/\1/' | \
+                  sort -u | \
+                  sed 's/\b\([0-9]\)\b/00\1/g' | sed 's/\b\([0-9][0-9]\)\b/0\1/g')
        
-    uninstall)
-        print_status "Uninstalling library from system..."
-        sudo make uninstall
-        print_success "Library uninstalled"
+        # Check for nostr_core.h (includes everything)
+        if grep -q '#include[[:space:]]*["\<]nostr_core\.h["\>]' *.c 2>/dev/null; then
+            print_info "Found #include \"nostr_core.h\" - building all NIPs"
+            NEEDED_NIPS="001 004 005 006 011 013 019 042 044 046 059 060 061"
+        elif [ -n "$DETECTED" ]; then
+            NEEDED_NIPS="$DETECTED"
+            print_success "Auto-detected NIPs: $(echo $NEEDED_NIPS | tr ' ' ',')"
+        else
+            print_warning "No NIP includes detected in *.c files"
+            print_info "Defaulting to basic NIPs: 001, 006, 019"
+            NEEDED_NIPS="001 006 019"
+        fi
+    else
+        print_warning "No .c files found in current directory"
+        print_info "Defaulting to basic NIPs: 001, 006, 019"
+        NEEDED_NIPS="001 006 019"
+    fi
+fi
+
+# If building tests or examples, include all NIPs to ensure compatibility
+if ([ "$BUILD_TESTS" = true ] || [ "$BUILD_EXAMPLES" = true ]) && [ -z "$FORCE_NIPS" ]; then
+    NEEDED_NIPS="001 004 005 006 011 013 017 019 021 042 044 046 059 060 061"
+    print_info "Building tests/examples - including all available NIPs for compatibility"
+fi
+
+# Ensure NIP-001 is always included (required for core functionality)
+if ! echo "$NEEDED_NIPS" | grep -q "001"; then
+    NEEDED_NIPS="001 $NEEDED_NIPS"
+    print_info "Added NIP-001 (required for core functionality)"
+fi
+
+
+
+###########################################################################################
+###########################################################################################
+############  AUTODETECT SYSTEM ARCHITECTURE
+###########################################################################################
+###########################################################################################
+
+# Determine architecture
+if [ -z "$ARCHITECTURE" ]; then
+    ARCH=$(uname -m)
+    case $ARCH in
+        x86_64|amd64)
+            ARCHITECTURE="x64"
+            ;;
+        aarch64|arm64)
+            ARCHITECTURE="arm64"
+            ;;
+        *)
+            ARCHITECTURE="x64"  # Default fallback
+            print_warning "Unknown architecture '$ARCH', defaulting to x64"
+            ;;
+    esac
+fi
+
+print_info "Target architecture: $ARCHITECTURE"
+
+# Set compiler based on architecture
+case $ARCHITECTURE in
+    x64)
+        CC="gcc"
+        ARCH_SUFFIX="x64"
        ;;
-        
-    help|--help|-h)
-        show_usage
+    arm64)
+        CC="aarch64-linux-gnu-gcc"
+        ARCH_SUFFIX="arm64"
        ;;
-        
    *)
-        print_error "Unknown target: $TARGET"
-        echo ""
-        show_usage
+        print_error "Unsupported architecture: $ARCHITECTURE"
        exit 1
        ;;
 esac
+
+# Check if compiler exists
+if ! command -v $CC &> /dev/null; then
+    print_error "Compiler $CC not found"
+    if [ "$ARCHITECTURE" = "arm64" ]; then
+        print_info "Install ARM64 cross-compiler: sudo apt install gcc-aarch64-linux-gnu"
+    fi
+    exit 1
+fi
+
+
+
+###########################################################################################
+###########################################################################################
+############  CHECK AND BUILD DEPENDENCIES BASED ON NEEDED NIPS
+###########################################################################################
+###########################################################################################
+
+print_info "Checking dependencies based on needed NIPs..."
+
+# Determine which dependencies are needed based on NIPs
+NEED_SECP256K1=false
+NEED_OPENSSL=false  
+NEED_CURL=false
+
+# secp256k1 is always needed (core cryptography for NIP-001)
+NEED_SECP256K1=true
+
+# Check if network-dependent NIPs are included
+NETWORK_NIPS="005 011"  # NIP-005 (DNS), NIP-011 (Relay info)
+for nip in $NEEDED_NIPS; do
+    case $nip in
+        005|011)
+            NEED_CURL=true
+            print_info "NIP-$nip requires HTTP functionality - curl needed"
+            ;;
+    esac
+done
+
+# WebSocket functionality is always enabled (using system OpenSSL)
+NEED_OPENSSL=true
+NEED_CURL=true
+print_info "WebSocket functionality enabled - system OpenSSL and curl required"
+
+if [ "$VERBOSE" = true ]; then
+    print_info "Dependency requirements:"
+    [ "$NEED_SECP256K1" = true ] && echo "  ✓ secp256k1 (core crypto)"
+    [ "$NEED_OPENSSL" = true ] && echo "  ✓ OpenSSL (TLS/WebSocket)"
+    [ "$NEED_CURL" = true ] && echo "  ✓ curl (HTTP requests)"
+fi
+
+# Function to detect system secp256k1
+detect_system_secp256k1() {
+    if [ "$NEED_SECP256K1" != true ]; then
+        return 0
+    fi
+    
+    print_info "Detecting system secp256k1..."
+    
+    # Try pkg-config first
+    if command -v pkg-config >/dev/null 2>&1 && pkg-config --exists libsecp256k1; then
+        SECP256K1_CFLAGS=$(pkg-config --cflags libsecp256k1)
+        SECP256K1_LIBS=$(pkg-config --libs libsecp256k1)
+        if [ "$VERBOSE" = true ]; then
+            print_success "Found secp256k1 via pkg-config"
+            print_info "  CFLAGS: $SECP256K1_CFLAGS"
+            print_info "  LIBS: $SECP256K1_LIBS"
+        fi
+        return 0
+    fi
+    
+    # Fallback to standard locations
+    SECP256K1_CFLAGS=""
+    SECP256K1_LIBS="-lsecp256k1"
+    
+    # Check common header locations
+    for header_path in /usr/include/secp256k1.h /usr/local/include/secp256k1.h; do
+        if [ -f "$header_path" ]; then
+            if [ "$header_path" != "/usr/include/secp256k1.h" ]; then
+                SECP256K1_CFLAGS="-I$(dirname $header_path)"
+            fi
+            if [ "$VERBOSE" = true ]; then
+                print_success "Found secp256k1 headers at: $header_path"
+            fi
+            break
+        fi
+    done
+    
+    # Check if we can find the libraries
+    if ! echo '#include <secp256k1.h>' | gcc $SECP256K1_CFLAGS -E - >/dev/null 2>&1; then
+        print_error "secp256k1 development headers not found"
+        print_info "Install with: sudo apt install libsecp256k1-dev (Ubuntu/Debian)"
+        print_info "            sudo yum install libsecp256k1-devel (CentOS/RHEL)"
+        print_info "            brew install secp256k1 (macOS)"
+        exit 1
+    fi
+    
+    print_success "System secp256k1 detected"
+}
+
+# Function to detect system OpenSSL
+detect_system_openssl() {
+    if [ "$NEED_OPENSSL" != true ]; then
+        return 0
+    fi
+    
+    print_info "Detecting system OpenSSL..."
+    
+    # Try pkg-config first
+    if command -v pkg-config >/dev/null 2>&1 && pkg-config --exists openssl; then
+        OPENSSL_CFLAGS=$(pkg-config --cflags openssl)
+        OPENSSL_LIBS=$(pkg-config --libs openssl)
+        if [ "$VERBOSE" = true ]; then
+            print_success "Found OpenSSL via pkg-config"
+            print_info "  CFLAGS: $OPENSSL_CFLAGS"
+            print_info "  LIBS: $OPENSSL_LIBS"
+        fi
+        return 0
+    fi
+    
+    # Fallback to standard locations
+    OPENSSL_CFLAGS=""
+    OPENSSL_LIBS="-lssl -lcrypto"
+    
+    # Check common header locations
+    for header_path in /usr/include/openssl /usr/local/include/openssl; do
+        if [ -f "$header_path/ssl.h" ]; then
+            if [ "$header_path" != "/usr/include/openssl" ]; then
+                OPENSSL_CFLAGS="-I$(dirname $header_path)"
+            fi
+            if [ "$VERBOSE" = true ]; then
+                print_success "Found OpenSSL headers at: $header_path"
+            fi
+            break
+        fi
+    done
+    
+    # Check if we can find the libraries
+    if ! echo '#include <openssl/ssl.h>' | gcc $OPENSSL_CFLAGS -E - >/dev/null 2>&1; then
+        print_error "OpenSSL development headers not found"
+        print_info "Install with: sudo apt install libssl-dev (Ubuntu/Debian)"
+        print_info "            sudo yum install openssl-devel (CentOS/RHEL)"
+        print_info "            brew install openssl (macOS)"
+        exit 1
+    fi
+    
+    print_success "System OpenSSL detected"
+}
+
+# Function to detect system curl
+detect_system_curl() {
+    if [ "$NEED_CURL" != true ]; then
+        return 0
+    fi
+    
+    print_info "Detecting system curl..."
+    
+    # Try pkg-config first
+    if command -v pkg-config >/dev/null 2>&1 && pkg-config --exists libcurl; then
+        CURL_CFLAGS=$(pkg-config --cflags libcurl)
+        CURL_LIBS=$(pkg-config --libs libcurl)
+        if [ "$VERBOSE" = true ]; then
+            print_success "Found curl via pkg-config"
+            print_info "  CFLAGS: $CURL_CFLAGS"
+            print_info "  LIBS: $CURL_LIBS"
+        fi
+        return 0
+    fi
+    
+    # Fallback to standard locations
+    CURL_CFLAGS=""
+    CURL_LIBS="-lcurl"
+    
+    # Check common header locations
+    for header_path in /usr/include/curl /usr/local/include/curl; do
+        if [ -f "$header_path/curl.h" ]; then
+            if [ "$header_path" != "/usr/include/curl" ]; then
+                CURL_CFLAGS="-I$(dirname $header_path)"
+            fi
+            if [ "$VERBOSE" = true ]; then
+                print_success "Found curl headers at: $header_path"
+            fi
+            break
+        fi
+    done
+    
+    # Check if we can find the libraries
+    if ! echo '#include <curl/curl.h>' | gcc $CURL_CFLAGS -E - >/dev/null 2>&1; then
+        print_error "curl development headers not found"
+        print_info "Install with: sudo apt install libcurl4-openssl-dev (Ubuntu/Debian)"
+        print_info "            sudo yum install libcurl-devel (CentOS/RHEL)"
+        print_info "            brew install curl (macOS)"
+        exit 1
+    fi
+    
+    print_success "System curl detected"
+}
+
+# Build only the needed dependencies
+detect_system_secp256k1
+detect_system_openssl  
+detect_system_curl
+
+
+###########################################################################################
+###########################################################################################
+############  ADD CORE DEPENDENCIES THAT NEED TO BE BUILT TO THE $SOURCES VARIABLE
+###########################################################################################
+###########################################################################################
+
+SOURCES="nostr_core/crypto/nostr_secp256k1.c"
+SOURCES="$SOURCES nostr_core/crypto/nostr_aes.c"
+SOURCES="$SOURCES nostr_core/crypto/nostr_chacha20.c"
+SOURCES="$SOURCES cjson/cJSON.c"
+SOURCES="$SOURCES nostr_core/utils.c"
+SOURCES="$SOURCES nostr_core/nostr_common.c"
+SOURCES="$SOURCES nostr_core/core_relays.c"
+SOURCES="$SOURCES nostr_core/core_relay_pool.c"
+SOURCES="$SOURCES nostr_core/nostr_log.c"
+SOURCES="$SOURCES nostr_websocket/nostr_websocket_openssl.c"
+SOURCES="$SOURCES nostr_core/request_validator.c"
+
+NIP_DESCRIPTIONS=""
+
+for nip in $NEEDED_NIPS; do
+    NIP_FILE="nostr_core/nip${nip}.c"
+    if [ -f "$NIP_FILE" ]; then
+        SOURCES="$SOURCES $NIP_FILE"
+        case $nip in
+            001) NIP_DESCRIPTIONS="$NIP_DESCRIPTIONS NIP-001(Basic)" ;;
+            004) NIP_DESCRIPTIONS="$NIP_DESCRIPTIONS NIP-004(Encrypt)" ;;
+            005) NIP_DESCRIPTIONS="$NIP_DESCRIPTIONS NIP-005(DNS)" ;;
+            006) NIP_DESCRIPTIONS="$NIP_DESCRIPTIONS NIP-006(Keys)" ;;
+            011) NIP_DESCRIPTIONS="$NIP_DESCRIPTIONS NIP-011(Relay-Info)" ;;
+            013) NIP_DESCRIPTIONS="$NIP_DESCRIPTIONS NIP-013(PoW)" ;;
+            017) NIP_DESCRIPTIONS="$NIP_DESCRIPTIONS NIP-017(DMs)" ;;
+            019) NIP_DESCRIPTIONS="$NIP_DESCRIPTIONS NIP-019(Bech32)" ;;
+            021) NIP_DESCRIPTIONS="$NIP_DESCRIPTIONS NIP-021(URI)" ;;
+            042) NIP_DESCRIPTIONS="$NIP_DESCRIPTIONS NIP-042(Auth)" ;;
+            044) NIP_DESCRIPTIONS="$NIP_DESCRIPTIONS NIP-044(Encrypt)" ;;
+            046) NIP_DESCRIPTIONS="$NIP_DESCRIPTIONS NIP-046(Remote-Signing)" ;;
+            059) NIP_DESCRIPTIONS="$NIP_DESCRIPTIONS NIP-059(Gift-Wrap)" ;;
+            060) NIP_DESCRIPTIONS="$NIP_DESCRIPTIONS NIP-060(Cashu-Wallet)" ;;
+            061) NIP_DESCRIPTIONS="$NIP_DESCRIPTIONS NIP-061(Nutzaps)" ;;
+        esac
+    else
+        print_warning "NIP file not found: $NIP_FILE - skipping"
+    fi
+done
+
+if echo "$NEEDED_NIPS" | grep -Eq '(^| )060( |$)|(^| )061( |$)'; then
+    SOURCES="$SOURCES nostr_core/cashu_mint.c"
+fi
+
+# Build flags
+CFLAGS="-Wall -Wextra -std=c99 -fPIC -O2"
+CFLAGS="$CFLAGS -DENABLE_FILE_LOGGING -DENABLE_WEBSOCKET_LOGGING -DENABLE_DEBUG_LOGGING"
+INCLUDES="-I. -Inostr_core -Inostr_core/crypto -Icjson -Inostr_websocket"
+
+# Add system library includes
+if [ -n "$SECP256K1_CFLAGS" ]; then
+    INCLUDES="$INCLUDES $SECP256K1_CFLAGS"
+fi
+if [ -n "$OPENSSL_CFLAGS" ]; then
+    INCLUDES="$INCLUDES $OPENSSL_CFLAGS"
+fi
+if [ -n "$CURL_CFLAGS" ]; then
+    INCLUDES="$INCLUDES $CURL_CFLAGS"
+fi
+
+# System libraries
+SYSTEM_LIBS=""
+if [ -n "$SECP256K1_LIBS" ]; then
+    SYSTEM_LIBS="$SYSTEM_LIBS $SECP256K1_LIBS"
+fi
+if [ -n "$OPENSSL_LIBS" ]; then
+    SYSTEM_LIBS="$SYSTEM_LIBS $OPENSSL_LIBS"
+fi
+if [ -n "$CURL_LIBS" ]; then
+    SYSTEM_LIBS="$SYSTEM_LIBS $CURL_LIBS"
+fi
+
+# Output library name
+OUTPUT="libnostr_core_${ARCH_SUFFIX}.a"
+
+print_info "Compiling with: $CC"
+print_info "Including:$NIP_DESCRIPTIONS"
+if [ "$VERBOSE" = true ]; then
+    print_info "Sources: $SOURCES"
+    print_info "Flags: $CFLAGS $INCLUDES"
+fi
+
+
+
+###########################################################################################
+###########################################################################################
+############  COMPILE EACH SOURCE FROM $SOURCES INTO A .o FILE
+###########################################################################################
+###########################################################################################
+
+OBJECTS=""
+for source in $SOURCES; do
+    if [ -f "$source" ]; then
+        obj_name=$(basename "$source" .c).${ARCH_SUFFIX}.o
+        OBJECTS="$OBJECTS $obj_name"
+        
+        if [ "$VERBOSE" = true ]; then
+            print_info "Compiling: $source -> $obj_name"
+        fi
+        
+        #################################################
+        # THE ACTUAL COMMAND TO COMPILE .c FILES
+        #################################################
+        $CC $CFLAGS $INCLUDES -c "$source" -o "$obj_name"
+
+        if [ $? -ne 0 ]; then
+            print_error "Failed to compile $source"
+            exit 1
+        fi
+    else
+        print_error "Source file not found: $source"
+        exit 1
+    fi
+done
+
+
+###########################################################################################
+###########################################################################################
+############  CREATE THE FINAL STATIC LIBRARY FOR THE PROJECT: libnostr_core_XX.a
+############  BY LINKING IN ALL OUR .o FILES THAT ARE REQUESTED TO BE ADDED.
+###########################################################################################
+###########################################################################################
+print_info "Creating static library with system dependencies: $OUTPUT"
+
+# Note: All crypto libraries (secp256k1, OpenSSL, curl) are now system dependencies
+# Only our own object files are included in the static library
+
+#########################################################
+### THE ACTUAL COMMAND TO LINK .o FILES INTO A .a FILE
+#########################################################
+ar rcs "$OUTPUT" $OBJECTS
+AR_RESULT=$?
+
+
+
+###########################################################################################
+###########################################################################################
+############  IF THE LINKING OCCURED SUCCESSFULLY, BUILD THE TEST FILE EXECUTABLES
+############  BY LINKING IN ALL OUR .o FILES THAT ARE REQUESTED TO BE ADDED.
+###########################################################################################
+###########################################################################################
+if [ $AR_RESULT -eq 0 ]; then
+    # Cleanup object files
+    rm -f $OBJECTS
+    
+    # Show library info
+    size_kb=$(du -k "$OUTPUT" | cut -f1)
+    print_success "Built $OUTPUT (${size_kb}KB) with:$NIP_DESCRIPTIONS"
+    
+    # Build tests if requested
+    if [ "$BUILD_TESTS" = true ]; then
+        print_info "Scanning tests/ directory for test programs..."
+        
+        if [ ! -d "tests" ]; then
+            print_warning "tests/ directory not found - skipping test builds"
+        else
+            TEST_COUNT=0
+            SUCCESS_COUNT=0
+            
+            # Find all .c files in tests/ directory (not subdirectories)
+            while IFS= read -r -d '' test_file; do
+                TEST_COUNT=$((TEST_COUNT + 1))
+                test_name=$(basename "$test_file" .c)
+                test_exe="tests/$test_name"
+                
+                print_info "Building test: $test_name"
+                
+                # Test compilation with system libraries
+                LINK_FLAGS="-lz -ldl -lpthread -lm $SYSTEM_LIBS"
+                
+                if [ "$VERBOSE" = true ]; then
+                    print_info "  Command: $CC $CFLAGS $INCLUDES \"$test_file\" -o \"$test_exe\" ./$OUTPUT $LINK_FLAGS"
+                fi
+                
+                if $CC $CFLAGS $INCLUDES "$test_file" -o "$test_exe" "./$OUTPUT" $LINK_FLAGS; then
+                    SUCCESS_COUNT=$((SUCCESS_COUNT + 1))
+                    print_success "Built $test_name"
+                    if [ "$VERBOSE" = true ]; then
+                        print_info "  Executable: $test_exe"
+                    fi
+                else
+                    print_error "  Failed to build: $test_name"
+                fi
+                
+            done < <(find tests/ -maxdepth 1 -name "*.c" -type f -print0)
+            
+            if [ $TEST_COUNT -eq 0 ]; then
+                print_warning "No .c files found in tests/ directory"
+            else
+                print_success "Built $SUCCESS_COUNT/$TEST_COUNT test programs"
+            fi
+        fi
+        echo ""
+    fi
+
+    # Build examples if requested
+    if [ "$BUILD_EXAMPLES" = true ]; then
+        print_info "Scanning examples/ directory for example programs..."
+
+        if [ ! -d "examples" ]; then
+            print_warning "examples/ directory not found - skipping example builds"
+        else
+            EXAMPLE_COUNT=0
+            SUCCESS_COUNT=0
+
+            # Find all .c files in examples/ directory (not subdirectories)
+            while IFS= read -r -d '' example_file; do
+                EXAMPLE_COUNT=$((EXAMPLE_COUNT + 1))
+                example_name=$(basename "$example_file" .c)
+                example_exe="examples/$example_name"
+
+                print_info "Building example: $example_name"
+
+                # Example compilation with system libraries
+                LINK_FLAGS="-lz -ldl -lpthread -lm $SYSTEM_LIBS"
+
+                if [ "$VERBOSE" = true ]; then
+                    print_info "  Command: $CC $CFLAGS $INCLUDES \"$example_file\" -o \"$example_exe\" ./$OUTPUT $LINK_FLAGS"
+                fi
+
+                if $CC $CFLAGS $INCLUDES "$example_file" -o "$example_exe" "./$OUTPUT" $LINK_FLAGS; then
+                    SUCCESS_COUNT=$((SUCCESS_COUNT + 1))
+                    print_success "Built $example_name"
+                    if [ "$VERBOSE" = true ]; then
+                        print_info "  Executable: $example_exe"
+                    fi
+                else
+                    print_error "  Failed to build: $example_name"
+                fi
+
+            done < <(find examples/ -maxdepth 1 -name "*.c" -type f -print0)
+
+            if [ $EXAMPLE_COUNT -eq 0 ]; then
+                print_warning "No .c files found in examples/ directory"
+            else
+                print_success "Built $SUCCESS_COUNT/$EXAMPLE_COUNT example programs"
+            fi
+        fi
+        echo ""
+    fi
+
+    echo "Usage in your project:"
+    echo "  gcc your_app.c $OUTPUT -lz -ldl -lpthread -lm $SYSTEM_LIBS -o your_app"
+    echo ""
+else
+    print_error "Failed to create static library"
+    exit 1
+fi
@@ -0,0 +1,306 @@
+/*
+  Copyright (c) 2009-2017 Dave Gamble and cJSON contributors
+
+  Permission is hereby granted, free of charge, to any person obtaining a copy
+  of this software and associated documentation files (the "Software"), to deal
+  in the Software without restriction, including without limitation the rights
+  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+  copies of the Software, and to permit persons to whom the Software is
+  furnished to do so, subject to the following conditions:
+
+  The above copyright notice and this permission notice shall be included in
+  all copies or substantial portions of the Software.
+
+  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+  THE SOFTWARE.
+*/
+
+#ifndef cJSON__h
+#define cJSON__h
+
+#ifdef __cplusplus
+extern "C"
+{
+#endif
+
+#if !defined(__WINDOWS__) && (defined(WIN32) || defined(WIN64) || defined(_MSC_VER) || defined(_WIN32))
+#define __WINDOWS__
+#endif
+
+#ifdef __WINDOWS__
+
+/* When compiling for windows, we specify a specific calling convention to avoid issues where we are being called from a project with a different default calling convention.  For windows you have 3 define options:
+
+CJSON_HIDE_SYMBOLS - Define this in the case where you don't want to ever dllexport symbols
+CJSON_EXPORT_SYMBOLS - Define this on library build when you want to dllexport symbols (default)
+CJSON_IMPORT_SYMBOLS - Define this if you want to dllimport symbol
+
+For *nix builds that support visibility attribute, you can define similar behavior by
+
+setting default visibility to hidden by adding
+-fvisibility=hidden (for gcc)
+or
+-xldscope=hidden (for sun cc)
+to CFLAGS
+
+then using the CJSON_API_VISIBILITY flag to "export" the same symbols the way CJSON_EXPORT_SYMBOLS does
+
+*/
+
+#define CJSON_CDECL __cdecl
+#define CJSON_STDCALL __stdcall
+
+/* export symbols by default, this is necessary for copy pasting the C and header file */
+#if !defined(CJSON_HIDE_SYMBOLS) && !defined(CJSON_IMPORT_SYMBOLS) && !defined(CJSON_EXPORT_SYMBOLS)
+#define CJSON_EXPORT_SYMBOLS
+#endif
+
+#if defined(CJSON_HIDE_SYMBOLS)
+#define CJSON_PUBLIC(type)   type CJSON_STDCALL
+#elif defined(CJSON_EXPORT_SYMBOLS)
+#define CJSON_PUBLIC(type)   __declspec(dllexport) type CJSON_STDCALL
+#elif defined(CJSON_IMPORT_SYMBOLS)
+#define CJSON_PUBLIC(type)   __declspec(dllimport) type CJSON_STDCALL
+#endif
+#else /* !__WINDOWS__ */
+#define CJSON_CDECL
+#define CJSON_STDCALL
+
+#if (defined(__GNUC__) || defined(__SUNPRO_CC) || defined (__SUNPRO_C)) && defined(CJSON_API_VISIBILITY)
+#define CJSON_PUBLIC(type)   __attribute__((visibility("default"))) type
+#else
+#define CJSON_PUBLIC(type) type
+#endif
+#endif
+
+/* project version */
+#define CJSON_VERSION_MAJOR 1
+#define CJSON_VERSION_MINOR 7
+#define CJSON_VERSION_PATCH 18
+
+#include <stddef.h>
+
+/* cJSON Types: */
+#define cJSON_Invalid (0)
+#define cJSON_False  (1 << 0)
+#define cJSON_True   (1 << 1)
+#define cJSON_NULL   (1 << 2)
+#define cJSON_Number (1 << 3)
+#define cJSON_String (1 << 4)
+#define cJSON_Array  (1 << 5)
+#define cJSON_Object (1 << 6)
+#define cJSON_Raw    (1 << 7) /* raw json */
+
+#define cJSON_IsReference 256
+#define cJSON_StringIsConst 512
+
+/* The cJSON structure: */
+typedef struct cJSON
+{
+    /* next/prev allow you to walk array/object chains. Alternatively, use GetArraySize/GetArrayItem/GetObjectItem */
+    struct cJSON *next;
+    struct cJSON *prev;
+    /* An array or object item will have a child pointer pointing to a chain of the items in the array/object. */
+    struct cJSON *child;
+
+    /* The type of the item, as above. */
+    int type;
+
+    /* The item's string, if type==cJSON_String  and type == cJSON_Raw */
+    char *valuestring;
+    /* writing to valueint is DEPRECATED, use cJSON_SetNumberValue instead */
+    int valueint;
+    /* The item's number, if type==cJSON_Number */
+    double valuedouble;
+
+    /* The item's name string, if this item is the child of, or is in the list of subitems of an object. */
+    char *string;
+} cJSON;
+
+typedef struct cJSON_Hooks
+{
+      /* malloc/free are CDECL on Windows regardless of the default calling convention of the compiler, so ensure the hooks allow passing those functions directly. */
+      void *(CJSON_CDECL *malloc_fn)(size_t sz);
+      void (CJSON_CDECL *free_fn)(void *ptr);
+} cJSON_Hooks;
+
+typedef int cJSON_bool;
+
+/* Limits how deeply nested arrays/objects can be before cJSON rejects to parse them.
+ * This is to prevent stack overflows. */
+#ifndef CJSON_NESTING_LIMIT
+#define CJSON_NESTING_LIMIT 1000
+#endif
+
+/* Limits the length of circular references can be before cJSON rejects to parse them.
+ * This is to prevent stack overflows. */
+#ifndef CJSON_CIRCULAR_LIMIT
+#define CJSON_CIRCULAR_LIMIT 10000
+#endif
+
+/* returns the version of cJSON as a string */
+CJSON_PUBLIC(const char*) cJSON_Version(void);
+
+/* Supply malloc, realloc and free functions to cJSON */
+CJSON_PUBLIC(void) cJSON_InitHooks(cJSON_Hooks* hooks);
+
+/* Memory Management: the caller is always responsible to free the results from all variants of cJSON_Parse (with cJSON_Delete) and cJSON_Print (with stdlib free, cJSON_Hooks.free_fn, or cJSON_free as appropriate). The exception is cJSON_PrintPreallocated, where the caller has full responsibility of the buffer. */
+/* Supply a block of JSON, and this returns a cJSON object you can interrogate. */
+CJSON_PUBLIC(cJSON *) cJSON_Parse(const char *value);
+CJSON_PUBLIC(cJSON *) cJSON_ParseWithLength(const char *value, size_t buffer_length);
+/* ParseWithOpts allows you to require (and check) that the JSON is null terminated, and to retrieve the pointer to the final byte parsed. */
+/* If you supply a ptr in return_parse_end and parsing fails, then return_parse_end will contain a pointer to the error so will match cJSON_GetErrorPtr(). */
+CJSON_PUBLIC(cJSON *) cJSON_ParseWithOpts(const char *value, const char **return_parse_end, cJSON_bool require_null_terminated);
+CJSON_PUBLIC(cJSON *) cJSON_ParseWithLengthOpts(const char *value, size_t buffer_length, const char **return_parse_end, cJSON_bool require_null_terminated);
+
+/* Render a cJSON entity to text for transfer/storage. */
+CJSON_PUBLIC(char *) cJSON_Print(const cJSON *item);
+/* Render a cJSON entity to text for transfer/storage without any formatting. */
+CJSON_PUBLIC(char *) cJSON_PrintUnformatted(const cJSON *item);
+/* Render a cJSON entity to text using a buffered strategy. prebuffer is a guess at the final size. guessing well reduces reallocation. fmt=0 gives unformatted, =1 gives formatted */
+CJSON_PUBLIC(char *) cJSON_PrintBuffered(const cJSON *item, int prebuffer, cJSON_bool fmt);
+/* Render a cJSON entity to text using a buffer already allocated in memory with given length. Returns 1 on success and 0 on failure. */
+/* NOTE: cJSON is not always 100% accurate in estimating how much memory it will use, so to be safe allocate 5 bytes more than you actually need */
+CJSON_PUBLIC(cJSON_bool) cJSON_PrintPreallocated(cJSON *item, char *buffer, const int length, const cJSON_bool format);
+/* Delete a cJSON entity and all subentities. */
+CJSON_PUBLIC(void) cJSON_Delete(cJSON *item);
+
+/* Returns the number of items in an array (or object). */
+CJSON_PUBLIC(int) cJSON_GetArraySize(const cJSON *array);
+/* Retrieve item number "index" from array "array". Returns NULL if unsuccessful. */
+CJSON_PUBLIC(cJSON *) cJSON_GetArrayItem(const cJSON *array, int index);
+/* Get item "string" from object. Case insensitive. */
+CJSON_PUBLIC(cJSON *) cJSON_GetObjectItem(const cJSON * const object, const char * const string);
+CJSON_PUBLIC(cJSON *) cJSON_GetObjectItemCaseSensitive(const cJSON * const object, const char * const string);
+CJSON_PUBLIC(cJSON_bool) cJSON_HasObjectItem(const cJSON *object, const char *string);
+/* For analysing failed parses. This returns a pointer to the parse error. You'll probably need to look a few chars back to make sense of it. Defined when cJSON_Parse() returns 0. 0 when cJSON_Parse() succeeds. */
+CJSON_PUBLIC(const char *) cJSON_GetErrorPtr(void);
+
+/* Check item type and return its value */
+CJSON_PUBLIC(char *) cJSON_GetStringValue(const cJSON * const item);
+CJSON_PUBLIC(double) cJSON_GetNumberValue(const cJSON * const item);
+
+/* These functions check the type of an item */
+CJSON_PUBLIC(cJSON_bool) cJSON_IsInvalid(const cJSON * const item);
+CJSON_PUBLIC(cJSON_bool) cJSON_IsFalse(const cJSON * const item);
+CJSON_PUBLIC(cJSON_bool) cJSON_IsTrue(const cJSON * const item);
+CJSON_PUBLIC(cJSON_bool) cJSON_IsBool(const cJSON * const item);
+CJSON_PUBLIC(cJSON_bool) cJSON_IsNull(const cJSON * const item);
+CJSON_PUBLIC(cJSON_bool) cJSON_IsNumber(const cJSON * const item);
+CJSON_PUBLIC(cJSON_bool) cJSON_IsString(const cJSON * const item);
+CJSON_PUBLIC(cJSON_bool) cJSON_IsArray(const cJSON * const item);
+CJSON_PUBLIC(cJSON_bool) cJSON_IsObject(const cJSON * const item);
+CJSON_PUBLIC(cJSON_bool) cJSON_IsRaw(const cJSON * const item);
+
+/* These calls create a cJSON item of the appropriate type. */
+CJSON_PUBLIC(cJSON *) cJSON_CreateNull(void);
+CJSON_PUBLIC(cJSON *) cJSON_CreateTrue(void);
+CJSON_PUBLIC(cJSON *) cJSON_CreateFalse(void);
+CJSON_PUBLIC(cJSON *) cJSON_CreateBool(cJSON_bool boolean);
+CJSON_PUBLIC(cJSON *) cJSON_CreateNumber(double num);
+CJSON_PUBLIC(cJSON *) cJSON_CreateString(const char *string);
+/* raw json */
+CJSON_PUBLIC(cJSON *) cJSON_CreateRaw(const char *raw);
+CJSON_PUBLIC(cJSON *) cJSON_CreateArray(void);
+CJSON_PUBLIC(cJSON *) cJSON_CreateObject(void);
+
+/* Create a string where valuestring references a string so
+ * it will not be freed by cJSON_Delete */
+CJSON_PUBLIC(cJSON *) cJSON_CreateStringReference(const char *string);
+/* Create an object/array that only references it's elements so
+ * they will not be freed by cJSON_Delete */
+CJSON_PUBLIC(cJSON *) cJSON_CreateObjectReference(const cJSON *child);
+CJSON_PUBLIC(cJSON *) cJSON_CreateArrayReference(const cJSON *child);
+
+/* These utilities create an Array of count items.
+ * The parameter count cannot be greater than the number of elements in the number array, otherwise array access will be out of bounds.*/
+CJSON_PUBLIC(cJSON *) cJSON_CreateIntArray(const int *numbers, int count);
+CJSON_PUBLIC(cJSON *) cJSON_CreateFloatArray(const float *numbers, int count);
+CJSON_PUBLIC(cJSON *) cJSON_CreateDoubleArray(const double *numbers, int count);
+CJSON_PUBLIC(cJSON *) cJSON_CreateStringArray(const char *const *strings, int count);
+
+/* Append item to the specified array/object. */
+CJSON_PUBLIC(cJSON_bool) cJSON_AddItemToArray(cJSON *array, cJSON *item);
+CJSON_PUBLIC(cJSON_bool) cJSON_AddItemToObject(cJSON *object, const char *string, cJSON *item);
+/* Use this when string is definitely const (i.e. a literal, or as good as), and will definitely survive the cJSON object.
+ * WARNING: When this function was used, make sure to always check that (item->type & cJSON_StringIsConst) is zero before
+ * writing to `item->string` */
+CJSON_PUBLIC(cJSON_bool) cJSON_AddItemToObjectCS(cJSON *object, const char *string, cJSON *item);
+/* Append reference to item to the specified array/object. Use this when you want to add an existing cJSON to a new cJSON, but don't want to corrupt your existing cJSON. */
+CJSON_PUBLIC(cJSON_bool) cJSON_AddItemReferenceToArray(cJSON *array, cJSON *item);
+CJSON_PUBLIC(cJSON_bool) cJSON_AddItemReferenceToObject(cJSON *object, const char *string, cJSON *item);
+
+/* Remove/Detach items from Arrays/Objects. */
+CJSON_PUBLIC(cJSON *) cJSON_DetachItemViaPointer(cJSON *parent, cJSON * const item);
+CJSON_PUBLIC(cJSON *) cJSON_DetachItemFromArray(cJSON *array, int which);
+CJSON_PUBLIC(void) cJSON_DeleteItemFromArray(cJSON *array, int which);
+CJSON_PUBLIC(cJSON *) cJSON_DetachItemFromObject(cJSON *object, const char *string);
+CJSON_PUBLIC(cJSON *) cJSON_DetachItemFromObjectCaseSensitive(cJSON *object, const char *string);
+CJSON_PUBLIC(void) cJSON_DeleteItemFromObject(cJSON *object, const char *string);
+CJSON_PUBLIC(void) cJSON_DeleteItemFromObjectCaseSensitive(cJSON *object, const char *string);
+
+/* Update array items. */
+CJSON_PUBLIC(cJSON_bool) cJSON_InsertItemInArray(cJSON *array, int which, cJSON *newitem); /* Shifts pre-existing items to the right. */
+CJSON_PUBLIC(cJSON_bool) cJSON_ReplaceItemViaPointer(cJSON * const parent, cJSON * const item, cJSON * replacement);
+CJSON_PUBLIC(cJSON_bool) cJSON_ReplaceItemInArray(cJSON *array, int which, cJSON *newitem);
+CJSON_PUBLIC(cJSON_bool) cJSON_ReplaceItemInObject(cJSON *object,const char *string,cJSON *newitem);
+CJSON_PUBLIC(cJSON_bool) cJSON_ReplaceItemInObjectCaseSensitive(cJSON *object,const char *string,cJSON *newitem);
+
+/* Duplicate a cJSON item */
+CJSON_PUBLIC(cJSON *) cJSON_Duplicate(const cJSON *item, cJSON_bool recurse);
+/* Duplicate will create a new, identical cJSON item to the one you pass, in new memory that will
+ * need to be released. With recurse!=0, it will duplicate any children connected to the item.
+ * The item->next and ->prev pointers are always zero on return from Duplicate. */
+/* Recursively compare two cJSON items for equality. If either a or b is NULL or invalid, they will be considered unequal.
+ * case_sensitive determines if object keys are treated case sensitive (1) or case insensitive (0) */
+CJSON_PUBLIC(cJSON_bool) cJSON_Compare(const cJSON * const a, const cJSON * const b, const cJSON_bool case_sensitive);
+
+/* Minify a strings, remove blank characters(such as ' ', '\t', '\r', '\n') from strings.
+ * The input pointer json cannot point to a read-only address area, such as a string constant, 
+ * but should point to a readable and writable address area. */
+CJSON_PUBLIC(void) cJSON_Minify(char *json);
+
+/* Helper functions for creating and adding items to an object at the same time.
+ * They return the added item or NULL on failure. */
+CJSON_PUBLIC(cJSON*) cJSON_AddNullToObject(cJSON * const object, const char * const name);
+CJSON_PUBLIC(cJSON*) cJSON_AddTrueToObject(cJSON * const object, const char * const name);
+CJSON_PUBLIC(cJSON*) cJSON_AddFalseToObject(cJSON * const object, const char * const name);
+CJSON_PUBLIC(cJSON*) cJSON_AddBoolToObject(cJSON * const object, const char * const name, const cJSON_bool boolean);
+CJSON_PUBLIC(cJSON*) cJSON_AddNumberToObject(cJSON * const object, const char * const name, const double number);
+CJSON_PUBLIC(cJSON*) cJSON_AddStringToObject(cJSON * const object, const char * const name, const char * const string);
+CJSON_PUBLIC(cJSON*) cJSON_AddRawToObject(cJSON * const object, const char * const name, const char * const raw);
+CJSON_PUBLIC(cJSON*) cJSON_AddObjectToObject(cJSON * const object, const char * const name);
+CJSON_PUBLIC(cJSON*) cJSON_AddArrayToObject(cJSON * const object, const char * const name);
+
+/* When assigning an integer value, it needs to be propagated to valuedouble too. */
+#define cJSON_SetIntValue(object, number) ((object) ? (object)->valueint = (object)->valuedouble = (number) : (number))
+/* helper for the cJSON_SetNumberValue macro */
+CJSON_PUBLIC(double) cJSON_SetNumberHelper(cJSON *object, double number);
+#define cJSON_SetNumberValue(object, number) ((object != NULL) ? cJSON_SetNumberHelper(object, (double)number) : (number))
+/* Change the valuestring of a cJSON_String object, only takes effect when type of object is cJSON_String */
+CJSON_PUBLIC(char*) cJSON_SetValuestring(cJSON *object, const char *valuestring);
+
+/* If the object is not a boolean type this does nothing and returns cJSON_Invalid else it returns the new type*/
+#define cJSON_SetBoolValue(object, boolValue) ( \
+    (object != NULL && ((object)->type & (cJSON_False|cJSON_True))) ? \
+    (object)->type=((object)->type &(~(cJSON_False|cJSON_True)))|((boolValue)?cJSON_True:cJSON_False) : \
+    cJSON_Invalid\
+)
+
+/* Macro for iterating over an array or object */
+#define cJSON_ArrayForEach(element, array) for(element = (array != NULL) ? (array)->child : NULL; element != NULL; element = element->next)
+
+/* malloc/free objects using the malloc/free functions that have been set with cJSON_InitHooks */
+CJSON_PUBLIC(void *) cJSON_malloc(size_t size);
+CJSON_PUBLIC(void) cJSON_free(void *object);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif
@@ -1,40 +0,0 @@
-@PACKAGE_INIT@
-
-include(CMakeFindDependencyMacro)
-
-# Find required dependencies
-find_dependency(Threads REQUIRED)
-
-# Include targets
-include("${CMAKE_CURRENT_LIST_DIR}/nostr_core-targets.cmake")
-
-# Set variables for backward compatibility
-set(NOSTR_CORE_FOUND TRUE)
-set(NOSTR_CORE_VERSION "@PROJECT_VERSION@")
-
-# Check which libraries are available
-set(NOSTR_CORE_STATIC_AVAILABLE FALSE)
-set(NOSTR_CORE_SHARED_AVAILABLE FALSE)
-
-if(TARGET nostr_core::static)
-    set(NOSTR_CORE_STATIC_AVAILABLE TRUE)
-endif()
-
-if(TARGET nostr_core::shared)
-    set(NOSTR_CORE_SHARED_AVAILABLE TRUE)
-endif()
-
-# Provide convenient variables
-if(NOSTR_CORE_STATIC_AVAILABLE)
-    set(NOSTR_CORE_LIBRARIES nostr_core::static)
-elseif(NOSTR_CORE_SHARED_AVAILABLE)
-    set(NOSTR_CORE_LIBRARIES nostr_core::shared)
-endif()
-
-set(NOSTR_CORE_INCLUDE_DIRS "@PACKAGE_CMAKE_INSTALL_INCLUDEDIR@/nostr")
-
-# Feature information
-set(NOSTR_CORE_ENABLE_WEBSOCKETS @NOSTR_ENABLE_WEBSOCKETS@)
-set(NOSTR_CORE_USE_MBEDTLS @NOSTR_USE_MBEDTLS@)
-
-check_required_components(nostr_core)
@@ -1,107 +0,0 @@
-// Debug script to extract all intermediate values from nostr-tools NIP-44
-const { v2 } = require('./nostr-tools/nip44.js');
-const { bytesToHex, hexToBytes } = require('@noble/hashes/utils');
-
-// Test vector 1: single char 'a'
-console.log('=== NOSTR-TOOLS DEBUG: Single char "a" ===');
-const sec1 = hexToBytes('0000000000000000000000000000000000000000000000000000000000000001');
-const sec2 = hexToBytes('0000000000000000000000000000000000000000000000000000000000000002');
-const nonce = hexToBytes('0000000000000000000000000000000000000000000000000000000000000001');
-const plaintext = 'a';
-
-// Step 1: Get public keys
-const { schnorr } = require('@noble/curves/secp256k1');
-const pub1 = bytesToHex(schnorr.getPublicKey(sec1));
-const pub2 = bytesToHex(schnorr.getPublicKey(sec2));
-console.log('pub1:', pub1);
-console.log('pub2:', pub2);
-
-// Step 2: Get conversation key
-const conversationKey = v2.utils.getConversationKey(sec1, pub2);
-console.log('conversation_key:', bytesToHex(conversationKey));
-
-// Step 3: Get shared secret (raw ECDH)
-const { secp256k1 } = require('@noble/curves/secp256k1');
-const sharedPoint = secp256k1.getSharedSecret(sec1, '02' + pub2);
-const sharedSecret = sharedPoint.subarray(1, 33); // X coordinate only
-console.log('ecdh_shared_secret:', bytesToHex(sharedSecret));
-
-// Step 4: Get message keys using internal function
-const hkdf = require('@noble/hashes/hkdf');
-const { sha256 } = require('@noble/hashes/sha256');
-
-// HKDF Extract step
-const salt = new TextEncoder().encode('nip44-v2');
-const prk = hkdf.extract(sha256, sharedSecret, salt);
-console.log('hkdf_extract_result:', bytesToHex(prk));
-
-// HKDF Expand step  
-const messageKeys = hkdf.expand(sha256, prk, nonce, 76);
-const chachaKey = messageKeys.subarray(0, 32);
-const chachaNonce = messageKeys.subarray(32, 44);
-const hmacKey = messageKeys.subarray(44, 76);
-
-console.log('chacha_key:', bytesToHex(chachaKey));
-console.log('chacha_nonce:', bytesToHex(chachaNonce));
-console.log('hmac_key:', bytesToHex(hmacKey));
-
-// Step 5: Pad the plaintext
-function pad(plaintext) {
-    const utf8Encoder = new TextEncoder();
-    const unpadded = utf8Encoder.encode(plaintext);
-    const unpaddedLen = unpadded.length;
-    
-    // Length prefix (big-endian u16)
-    const prefix = new Uint8Array(2);
-    new DataView(prefix.buffer).setUint16(0, unpaddedLen, false);
-    
-    // Calculate padded length
-    function calcPaddedLen(len) {
-        if (len <= 32) return 32;
-        const nextPower = 1 << (Math.floor(Math.log2(len - 1)) + 1);
-        const chunk = nextPower <= 256 ? 32 : nextPower / 8;
-        return chunk * (Math.floor((len - 1) / chunk) + 1);
-    }
-    
-    const paddedLen = calcPaddedLen(unpaddedLen + 2);
-    const suffix = new Uint8Array(paddedLen - 2 - unpaddedLen);
-    
-    // Combine: prefix + plaintext + padding
-    const result = new Uint8Array(paddedLen);
-    result.set(prefix);
-    result.set(unpadded, 2);
-    result.set(suffix, 2 + unpaddedLen);
-    
-    return result;
-}
-
-const paddedPlaintext = pad(plaintext);
-console.log('padded_plaintext:', bytesToHex(paddedPlaintext));
-console.log('padded_length:', paddedPlaintext.length);
-
-// Step 6: ChaCha20 encrypt
-const { chacha20 } = require('@noble/ciphers/chacha');
-const ciphertext = chacha20(chachaKey, chachaNonce, paddedPlaintext);
-console.log('ciphertext:', bytesToHex(ciphertext));
-
-// Step 7: HMAC with AAD
-const { hmac } = require('@noble/hashes/hmac');
-const { concatBytes } = require('@noble/hashes/utils');
-const aad = concatBytes(nonce, ciphertext);
-console.log('aad_data:', bytesToHex(aad));
-const mac = hmac(sha256, hmacKey, aad);
-console.log('mac:', bytesToHex(mac));
-
-// Step 8: Final payload
-const { base64 } = require('@scure/base');
-const payload = concatBytes(new Uint8Array([2]), nonce, ciphertext, mac);
-console.log('raw_payload:', bytesToHex(payload));
-const base64Payload = base64.encode(payload);
-console.log('final_payload:', base64Payload);
-
-// Expected from test vectors
-console.log('expected_payload:', 'AgAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAABee0G5VSK0/9YypIObAtDKfYEAjD35uVkHyB0F4DwrcNaCXlCWZKaArsGrY6M9wnuTMxWfp1RTN9Xga8no+kF5Vsb');
-
-// Now let's also test the full encrypt function
-const fullEncrypt = v2.encrypt(plaintext, conversationKey, nonce);
-console.log('v2.encrypt_result:', fullEncrypt);
@@ -0,0 +1,121 @@
+/*
+ * Example: NIP-60/NIP-61 Cashu Wallet Flow
+ */
+
+#include <stdio.h>
+#include <string.h>
+#include <stdlib.h>
+#include "../nostr_core/nostr_core.h"
+
+static void print_event(const char* title, cJSON* evt) {
+    if (!evt) {
+        printf("%s: <null>\n", title);
+        return;
+    }
+    char* s = cJSON_Print(evt);
+    if (s) {
+        printf("\n%s\n%s\n", title, s);
+        free(s);
+    }
+}
+
+int main(void) {
+    if (nostr_init() != NOSTR_SUCCESS) {
+        printf("Failed to initialize library\n");
+        return 1;
+    }
+
+    const char* user_sk_hex = "91ba716fa9e7ea2fcbad360cf4f8e0d312f73984da63d90f524ad61a6a1e7dbe";
+    unsigned char user_sk[32];
+    if (nostr_hex_to_bytes(user_sk_hex, user_sk, 32) != 0) {
+        printf("Invalid private key\n");
+        nostr_cleanup();
+        return 1;
+    }
+
+    /* 1) Create wallet event (kind:17375) */
+    char* mint_urls[] = {
+        "https://mint1.example.com",
+        "https://mint2.example.com"
+    };
+
+    nostr_nip60_wallet_data_t wallet_data;
+    memset(&wallet_data, 0, sizeof(wallet_data));
+    strcpy(wallet_data.privkey, "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa");
+    wallet_data.mint_urls = mint_urls;
+    wallet_data.mint_count = 2;
+
+    cJSON* wallet_event = nostr_nip60_create_wallet_event(&wallet_data, user_sk, 0);
+    print_event("Wallet Event (kind:17375)", wallet_event);
+
+    /* 2) Create token event (kind:7375) */
+    nostr_cashu_proof_t proofs[2];
+    memset(proofs, 0, sizeof(proofs));
+
+    strcpy(proofs[0].id, "005c2502034d4f12");
+    proofs[0].amount = 1;
+    proofs[0].secret = "secret-1";
+    proofs[0].C = "0241d98a8197ef238a192d47edf191a9de78b657308937b4f7dd0aa53beae72c46";
+
+    strcpy(proofs[1].id, "005c2502034d4f12");
+    proofs[1].amount = 2;
+    proofs[1].secret = "secret-2";
+    proofs[1].C = "02277c66191736eb72fce9d975d08e3191f8f96afb73ab1eec37e4465683066d3f";
+
+    nostr_nip60_token_data_t token_data;
+    memset(&token_data, 0, sizeof(token_data));
+    token_data.mint_url = "https://mint1.example.com";
+    token_data.proofs = proofs;
+    token_data.proof_count = 2;
+
+    cJSON* token_event = nostr_nip60_create_token_event(&token_data, user_sk, 0);
+    print_event("Token Event (kind:7375)", token_event);
+
+    /* 3) Create spend history event (kind:7376) */
+    nostr_nip60_history_ref_t refs[1];
+    memset(refs, 0, sizeof(refs));
+    strcpy(refs[0].event_id, "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa");
+    refs[0].marker = NOSTR_NIP60_REF_CREATED;
+
+    nostr_nip60_history_data_t hist;
+    memset(&hist, 0, sizeof(hist));
+    hist.direction = NOSTR_NIP60_DIRECTION_IN;
+    hist.amount = 3;
+    hist.refs = refs;
+    hist.ref_count = 1;
+
+    cJSON* history_event = nostr_nip60_create_history_event(&hist, user_sk, 0);
+    print_event("History Event (kind:7376)", history_event);
+
+    /* 4) Create nutzap info event (kind:10019) */
+    char* relays[] = {"wss://relay1.example.com", "wss://relay2.example.com"};
+    char* mint_units[] = {"sat"};
+
+    nostr_nip61_mint_entry_t mint_entry;
+    memset(&mint_entry, 0, sizeof(mint_entry));
+    mint_entry.url = "https://mint1.example.com";
+    mint_entry.units = mint_units;
+    mint_entry.unit_count = 1;
+
+    nostr_nip61_nutzap_info_t info;
+    memset(&info, 0, sizeof(info));
+    info.relay_urls = relays;
+    info.relay_count = 2;
+    info.mints = &mint_entry;
+    info.mint_count = 1;
+    strcpy(info.pubkey, "02eaee8939e3565e48cc62967e2fde9d8e2a4b3ec0081f29eceff5c64ef10ac1ed");
+
+    cJSON* info_event = nostr_nip61_create_nutzap_info_event(&info, user_sk, 0);
+    print_event("Nutzap Info Event (kind:10019)", info_event);
+
+    /* 5) Optionally call Cashu mint HTTP endpoints with [cashu_mint_get_info()] */
+    printf("\nCashu mint integration is available via cashu_mint_* APIs.\n");
+
+    cJSON_Delete(info_event);
+    cJSON_Delete(history_event);
+    cJSON_Delete(token_event);
+    cJSON_Delete(wallet_event);
+
+    nostr_cleanup();
+    return 0;
+}
@@ -1,39 +0,0 @@
-# Example CMakeLists.txt for a project using nostr_core library
-cmake_minimum_required(VERSION 3.12)
-project(my_nostr_app VERSION 1.0.0 LANGUAGES C)
-
-set(CMAKE_C_STANDARD 99)
-
-# Method 1: Find installed package
-# Uncomment if nostr_core is installed system-wide
-# find_package(nostr_core REQUIRED)
-
-# Method 2: Use as subdirectory
-# Uncomment if nostr_core is a subdirectory
-# add_subdirectory(nostr_core)
-
-# Method 3: Use pkg-config
-# Uncomment if using pkg-config
-# find_package(PkgConfig REQUIRED)
-# pkg_check_modules(NOSTR_CORE REQUIRED nostr_core)
-
-# Create executable
-add_executable(my_nostr_app main.c)
-
-# Link with nostr_core
-# Choose one of the following based on your integration method:
-
-# Method 1: Installed package
-# target_link_libraries(my_nostr_app nostr_core::static)
-
-# Method 2: Subdirectory
-# target_link_libraries(my_nostr_app nostr_core_static)
-
-# Method 3: pkg-config
-# target_include_directories(my_nostr_app PRIVATE ${NOSTR_CORE_INCLUDE_DIRS})
-# target_link_libraries(my_nostr_app ${NOSTR_CORE_LIBRARIES})
-
-# For this example, we'll assume Method 2 (subdirectory)
-# Add the parent nostr_core directory
-add_subdirectory(../.. nostr_core)
-target_link_libraries(my_nostr_app nostr_core_static)
@@ -1,186 +0,0 @@
-# NOSTR Core Integration Example
-
-This directory contains a complete example showing how to integrate the NOSTR Core library into your own projects.
-
-## What This Example Demonstrates
-
- **Library Initialization**: Proper setup and cleanup of the NOSTR library
- **Identity Management**: Key generation, bech32 encoding, and format detection
- **Event Creation**: Creating and signing different types of NOSTR events
- **Input Handling**: Processing various input formats (mnemonic, hex, bech32)
- **Utility Functions**: Using helper functions for hex conversion and error handling
- **CMake Integration**: How to integrate the library in your CMake-based project
-
-## Building and Running
-
-### Method 1: Using CMake
-
-```bash
-# Create build directory
-mkdir build && cd build
-
-# Configure with CMake
-cmake ..
-
-# Build
-make
-
-# Run the example
-./my_nostr_app
-```
-
-### Method 2: Manual Compilation
-
-```bash
-# Compile directly (assuming you're in the c_nostr root directory)
-gcc -I. examples/integration_example/main.c nostr_core.c nostr_crypto.c cjson/cJSON.c -lm -o integration_example
-
-# Run
-./integration_example
-```
-
-## Expected Output
-
-The example will demonstrate:
-
-1. **Identity Management Demo**
-   - Generate a new keypair
-   - Display keys in hex and bech32 format
-
-2. **Event Creation Demo**
-   - Create a text note event
-   - Create a profile event
-   - Display the JSON for both events
-
-3. **Input Handling Demo**
-   - Process different input formats
-   - Show format detection and decoding
-
-4. **Utility Functions Demo**
-   - Hex conversion round-trip
-   - Error message display
-
-## Integration Patterns
-
-### Pattern 1: CMake Find Package
-
-If NOSTR Core is installed system-wide:
-
-```cmake
-find_package(nostr_core REQUIRED)
-target_link_libraries(your_app nostr_core::static)
-```
-
-### Pattern 2: CMake Subdirectory
-
-If NOSTR Core is a subdirectory of your project:
-
-```cmake
-add_subdirectory(nostr_core)
-target_link_libraries(your_app nostr_core_static)
-```
-
-### Pattern 3: pkg-config
-
-If using pkg-config:
-
-```cmake
-find_package(PkgConfig REQUIRED)
-pkg_check_modules(NOSTR_CORE REQUIRED nostr_core)
-target_include_directories(your_app PRIVATE ${NOSTR_CORE_INCLUDE_DIRS})
-target_link_libraries(your_app ${NOSTR_CORE_LIBRARIES})
-```
-
-### Pattern 4: Direct Source Integration
-
-Copy the essential files to your project:
-
-```bash
-cp nostr_core.{c,h} nostr_crypto.{c,h} your_project/src/
-cp -r cjson/ your_project/src/
-```
-
-Then compile them with your project sources.
-
-## Code Structure
-
-### main.c Structure
-
-The example is organized into clear demonstration functions:
-
- `demo_identity_management()` - Key generation and encoding
- `demo_event_creation()` - Creating different event types
- `demo_input_handling()` - Processing various input formats
- `demo_utilities()` - Using utility functions
-
-Each function demonstrates specific aspects of the library while maintaining proper error handling and resource cleanup.
-
-### Key Integration Points
-
-1. **Initialization**
-   ```c
-   int ret = nostr_init();
-   if (ret != NOSTR_SUCCESS) {
-       // Handle error
-   }
-   ```
-
-2. **Resource Cleanup**
-   ```c
-   // Always clean up JSON objects
-   cJSON_Delete(event);
-   
-   // Clean up library on exit
-   nostr_cleanup();
-   ```
-
-3. **Error Handling**
-   ```c
-   if (ret != NOSTR_SUCCESS) {
-       printf("Error: %s\n", nostr_strerror(ret));
-       return ret;
-   }
-   ```
-
-## Customization
-
-You can modify this example for your specific needs:
-
- Change the `app_config_t` structure to match your application's configuration
- Add additional event types or custom event creation logic
- Integrate with your existing error handling and logging systems
- Add networking functionality using the WebSocket layer
-
-## Dependencies
-
-This example requires:
- C99 compiler (gcc, clang)
- CMake 3.12+ (for CMake build)
- NOSTR Core library and its dependencies
-
-## Testing
-
-You can test different input formats by passing them as command line arguments:
-
-```bash
-# Test with mnemonic
-./my_nostr_app "abandon abandon abandon abandon abandon abandon abandon abandon abandon abandon abandon about"
-
-# Test with hex private key
-./my_nostr_app "0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef"
-
-# Test with bech32 nsec
-./my_nostr_app "nsec1xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx"
-```
-
-## Next Steps
-
-After studying this example, you can:
-
-1. Integrate the patterns into your own application
-2. Explore the WebSocket functionality for relay communication
-3. Add support for additional NOSTR event types
-4. Implement your own identity persistence layer
-5. Add networking and relay management features
-
-For more examples, see the other files in the `examples/` directory.
@@ -1,271 +0,0 @@
-/*
- * Example application demonstrating how to integrate nostr_core into other projects
- * This shows a complete workflow from key generation to event publishing
- */
-
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-#include "nostr_core.h"
-
-// Example application configuration
-typedef struct {
-    char* app_name;
-    char* version;
-    int debug_mode;
-} app_config_t;
-
-static app_config_t g_config = {
-    .app_name = "My NOSTR App",
-    .version = "1.0.0",
-    .debug_mode = 1
-};
-
-// Helper function to print hex data
-static void print_hex(const char* label, const unsigned char* data, size_t len) {
-    if (g_config.debug_mode) {
-        printf("%s: ", label);
-        for (size_t i = 0; i < len; i++) {
-            printf("%02x", data[i]);
-        }
-        printf("\n");
-    }
-}
-
-// Helper function to print JSON nicely
-static void print_event(const char* label, cJSON* event) {
-    if (!event) {
-        printf("%s: NULL\n", label);
-        return;
-    }
-    
-    char* json_string = cJSON_Print(event);
-    if (json_string) {
-        printf("%s:\n%s\n", label, json_string);
-        free(json_string);
-    }
-}
-
-// Example: Generate and manage identity
-static int demo_identity_management(void) {
-    printf("\n=== Identity Management Demo ===\n");
-    
-    unsigned char private_key[32], public_key[32];
-    char nsec[100], npub[100];
-    
-    // Generate a new keypair
-    printf("Generating new keypair...\n");
-    int ret = nostr_generate_keypair(private_key, public_key);
-    if (ret != NOSTR_SUCCESS) {
-        printf("Error generating keypair: %s\n", nostr_strerror(ret));
-        return ret;
-    }
-    
-    print_hex("Private Key", private_key, 32);
-    print_hex("Public Key", public_key, 32);
-    
-    // Convert to bech32 format
-    ret = nostr_key_to_bech32(private_key, "nsec", nsec);
-    if (ret != NOSTR_SUCCESS) {
-        printf("Error encoding nsec: %s\n", nostr_strerror(ret));
-        return ret;
-    }
-    
-    ret = nostr_key_to_bech32(public_key, "npub", npub);
-    if (ret != NOSTR_SUCCESS) {
-        printf("Error encoding npub: %s\n", nostr_strerror(ret));
-        return ret;
-    }
-    
-    printf("nsec: %s\n", nsec);
-    printf("npub: %s\n", npub);
-    
-    return NOSTR_SUCCESS;
-}
-
-// Example: Create different types of events
-static int demo_event_creation(const unsigned char* private_key) {
-    printf("\n=== Event Creation Demo ===\n");
-    
-    // Create a text note
-    printf("Creating text note...\n");
-    cJSON* text_event = nostr_create_text_event("Hello from my NOSTR app!", private_key);
-    if (!text_event) {
-        printf("Error creating text event\n");
-        return NOSTR_ERROR_JSON_PARSE;
-    }
-    print_event("Text Event", text_event);
-    
-    // Create a profile event
-    printf("\nCreating profile event...\n");
-    cJSON* profile_event = nostr_create_profile_event(
-        g_config.app_name, 
-        "A sample application demonstrating NOSTR integration",
-        private_key
-    );
-    if (!profile_event) {
-        printf("Error creating profile event\n");
-        cJSON_Delete(text_event);
-        return NOSTR_ERROR_JSON_PARSE;
-    }
-    print_event("Profile Event", profile_event);
-    
-    // Cleanup
-    cJSON_Delete(text_event);
-    cJSON_Delete(profile_event);
-    
-    return NOSTR_SUCCESS;
-}
-
-// Example: Handle different input formats
-static int demo_input_handling(const char* user_input) {
-    printf("\n=== Input Handling Demo ===\n");
-    printf("Processing input: %s\n", user_input);
-    
-    // Detect input type
-    int input_type = nostr_detect_input_type(user_input);
-    switch (input_type) {
-        case NOSTR_INPUT_MNEMONIC:
-            printf("Detected: BIP39 Mnemonic\n");
-            {
-                unsigned char priv[32], pub[32];
-                int ret = nostr_derive_keys_from_mnemonic(user_input, 0, priv, pub);
-                if (ret == NOSTR_SUCCESS) {
-                    print_hex("Derived Private Key", priv, 32);
-                    print_hex("Derived Public Key", pub, 32);
-                }
-            }
-            break;
-            
-        case NOSTR_INPUT_NSEC_HEX:
-            printf("Detected: Hex-encoded private key\n");
-            {
-                unsigned char decoded[32];
-                int ret = nostr_decode_nsec(user_input, decoded);
-                if (ret == NOSTR_SUCCESS) {
-                    print_hex("Decoded Private Key", decoded, 32);
-                }
-            }
-            break;
-            
-        case NOSTR_INPUT_NSEC_BECH32:
-            printf("Detected: Bech32-encoded private key (nsec)\n");
-            {
-                unsigned char decoded[32];
-                int ret = nostr_decode_nsec(user_input, decoded);
-                if (ret == NOSTR_SUCCESS) {
-                    print_hex("Decoded Private Key", decoded, 32);
-                }
-            }
-            break;
-            
-        default:
-            printf("Unknown input format\n");
-            return NOSTR_ERROR_INVALID_INPUT;
-    }
-    
-    return NOSTR_SUCCESS;
-}
-
-// Example: Demonstrate utility functions
-static int demo_utilities(void) {
-    printf("\n=== Utility Functions Demo ===\n");
-    
-    // Hex conversion
-    const char* test_hex = "deadbeef";
-    unsigned char bytes[4];
-    char hex_result[9];
-    
-    printf("Testing hex conversion with: %s\n", test_hex);
-    
-    int ret = nostr_hex_to_bytes(test_hex, bytes, 4);
-    if (ret != NOSTR_SUCCESS) {
-        printf("Error in hex_to_bytes: %s\n", nostr_strerror(ret));
-        return ret;
-    }
-    
-    nostr_bytes_to_hex(bytes, 4, hex_result);
-    printf("Round-trip result: %s\n", hex_result);
-    
-    // Error message testing
-    printf("\nTesting error messages:\n");
-    for (int i = 0; i >= -10; i--) {
-        const char* msg = nostr_strerror(i);
-        if (msg && strlen(msg) > 0) {
-            printf("  %d: %s\n", i, msg);
-        }
-    }
-    
-    return NOSTR_SUCCESS;
-}
-
-int main(int argc, char* argv[]) {
-    printf("%s v%s\n", g_config.app_name, g_config.version);
-    printf("NOSTR Core Integration Example\n");
-    printf("=====================================\n");
-    
-    // Initialize the NOSTR library
-    printf("Initializing NOSTR core library...\n");
-    int ret = nostr_init();
-    if (ret != NOSTR_SUCCESS) {
-        printf("Failed to initialize NOSTR library: %s\n", nostr_strerror(ret));
-        return 1;
-    }
-    
-    // Run demonstrations
-    unsigned char demo_private_key[32];
-    
-    // 1. Identity management
-    ret = demo_identity_management();
-    if (ret != NOSTR_SUCCESS) {
-        goto cleanup;
-    }
-    
-    // Generate a key for other demos
-    nostr_generate_keypair(demo_private_key, NULL);
-    
-    // 2. Event creation
-    ret = demo_event_creation(demo_private_key);
-    if (ret != NOSTR_SUCCESS) {
-        goto cleanup;
-    }
-    
-    // 3. Input handling (use command line argument if provided)
-    const char* test_input = (argc > 1) ? argv[1] : 
-        "abandon abandon abandon abandon abandon abandon abandon abandon abandon abandon abandon about";
-    ret = demo_input_handling(test_input);
-    if (ret != NOSTR_SUCCESS && ret != NOSTR_ERROR_INVALID_INPUT) {
-        goto cleanup;
-    }
-    
-    // 4. Utility functions
-    ret = demo_utilities();
-    if (ret != NOSTR_SUCCESS) {
-        goto cleanup;
-    }
-    
-    printf("\n=====================================\n");
-    printf("All demonstrations completed successfully!\n");
-    printf("\nThis example shows how to:\n");
-    printf("  • Initialize the NOSTR library\n");
-    printf("  • Generate and manage keypairs\n");
-    printf("  • Create and sign different event types\n");
-    printf("  • Handle various input formats\n");
-    printf("  • Use utility functions\n");
-    printf("  • Clean up resources properly\n");
-    
-    ret = NOSTR_SUCCESS;
-
-cleanup:
-    // Clean up the NOSTR library
-    printf("\nCleaning up NOSTR library...\n");
-    nostr_cleanup();
-    
-    if (ret == NOSTR_SUCCESS) {
-        printf("Example completed successfully.\n");
-        return 0;
-    } else {
-        printf("Example failed with error: %s\n", nostr_strerror(ret));
-        return 1;
-    }
-}
@@ -0,0 +1,125 @@
+/*
+ * NIP-46 Remote Signer Example
+ *
+ * Demonstrates signer session setup, bunker URL generation,
+ * request parsing, request handling, and encrypted response event creation.
+ */
+
+#include "../nostr_core/nostr_core.h"
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+static int parse_hex_key(const char* hex, unsigned char out[32]) {
+    if (!hex || strlen(hex) != 64) return -1;
+    return nostr_hex_to_bytes(hex, out, 32);
+}
+
+int main(int argc, char** argv) {
+    if (argc < 3) {
+        fprintf(stderr, "Usage: %s <signer_privkey_hex> <user_privkey_hex> [relay_url]\n", argv[0]);
+        fprintf(stderr, "Example: %s <64hex> <64hex> wss://relay.example.com\n", argv[0]);
+        return 1;
+    }
+
+    const char* relay = (argc >= 4) ? argv[3] : "wss://relay.example.com";
+
+    unsigned char signer_sk[32];
+    unsigned char user_sk[32];
+    if (parse_hex_key(argv[1], signer_sk) != 0 || parse_hex_key(argv[2], user_sk) != 0) {
+        fprintf(stderr, "Invalid private key hex; expected 64 hex characters for each key\n");
+        return 1;
+    }
+
+    if (nostr_init() != NOSTR_SUCCESS) {
+        fprintf(stderr, "Failed to initialize nostr library\n");
+        return 1;
+    }
+
+    const char* relays[] = { relay };
+    nostr_nip46_signer_session_t signer;
+    int rc = nostr_nip46_signer_session_init(&signer, signer_sk, user_sk, relays, 1);
+    if (rc != NOSTR_SUCCESS) {
+        fprintf(stderr, "signer init failed: %s\n", nostr_strerror(rc));
+        nostr_cleanup();
+        return 1;
+    }
+
+    char bunker_url[1024];
+    rc = nostr_nip46_signer_create_bunker_url(&signer, "demo-secret", bunker_url, sizeof(bunker_url));
+    if (rc != NOSTR_SUCCESS) {
+        fprintf(stderr, "failed to create bunker url: %s\n", nostr_strerror(rc));
+        nostr_nip46_signer_session_destroy(&signer);
+        nostr_cleanup();
+        return 1;
+    }
+
+    printf("NIP-46 signer initialized\n");
+    printf("Signer pubkey: %s\n", signer.signer_pubkey_hex);
+    printf("User pubkey:   %s\n", signer.user_pubkey_hex);
+    printf("Relay:         %s\n", relay);
+    printf("Bunker URL:    %s\n\n", bunker_url);
+
+    // Simulate receiving a connect request and producing a response
+    const char* connect_params[] = { signer.signer_pubkey_hex, "demo-secret", "sign_event:1,get_public_key" };
+    nostr_nip46_request_t req;
+    rc = nostr_nip46_create_request("demo-req-1", NOSTR_NIP46_METHOD_CONNECT, connect_params, 3, &req);
+    if (rc != NOSTR_SUCCESS) {
+        fprintf(stderr, "failed to create demo request: %s\n", nostr_strerror(rc));
+        nostr_nip46_signer_session_destroy(&signer);
+        nostr_cleanup();
+        return 1;
+    }
+
+    nostr_nip46_response_t resp;
+    rc = nostr_nip46_signer_handle_request(&signer, &req, &resp);
+    if (rc != NOSTR_SUCCESS) {
+        fprintf(stderr, "failed to handle demo request: %s\n", nostr_strerror(rc));
+        nostr_nip46_free_request(&req);
+        nostr_nip46_signer_session_destroy(&signer);
+        nostr_cleanup();
+        return 1;
+    }
+
+    printf("Handled method: %s\n", req.method_str);
+    printf("Response result: %s\n", resp.result ? resp.result : "<none>");
+    printf("Response error:  %s\n", resp.error ? resp.error : "<none>");
+
+    // Simulate building encrypted response event back to a client
+    unsigned char client_sk[32];
+    unsigned char client_pk[32];
+    memset(client_sk, 0, sizeof(client_sk));
+    client_sk[31] = 1; // deterministic demo key
+    if (nostr_ec_public_key_from_private_key(client_sk, client_pk) != 0) {
+        fprintf(stderr, "failed to derive demo client pubkey\n");
+        nostr_nip46_free_response(&resp);
+        nostr_nip46_free_request(&req);
+        nostr_nip46_signer_session_destroy(&signer);
+        nostr_cleanup();
+        return 1;
+    }
+
+    cJSON* response_event = nostr_nip46_create_response_event(&resp, signer.signer_private_key, client_pk, 0);
+    if (!response_event) {
+        fprintf(stderr, "failed to create encrypted response event\n");
+        nostr_nip46_free_response(&resp);
+        nostr_nip46_free_request(&req);
+        nostr_nip46_signer_session_destroy(&signer);
+        nostr_cleanup();
+        return 1;
+    }
+
+    char* response_event_json = cJSON_Print(response_event);
+    if (response_event_json) {
+        printf("\nEncrypted response event (publish this to relays):\n%s\n", response_event_json);
+        free(response_event_json);
+    }
+
+    cJSON_Delete(response_event);
+    nostr_nip46_free_response(&resp);
+    nostr_nip46_free_request(&req);
+    nostr_nip46_signer_session_destroy(&signer);
+    nostr_cleanup();
+
+    return 0;
+}
@@ -0,0 +1,889 @@
+/*
+ * Interactive Relay Pool Test Program
+ *
+ * Interactive command-line interface for testing nostr_relay_pool functionality.
+ * All output is logged to pool.log while the menu runs in the terminal.
+ *
+ * Usage: ./pool_test
+ */
+
+#define _POSIX_C_SOURCE 200809L
+#define _DEFAULT_SOURCE
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <signal.h>
+#include <time.h>
+#include <unistd.h>
+#include <pthread.h>
+#include <fcntl.h>
+#include <sys/stat.h>
+#include "../nostr_core/nostr_core.h"
+#include "../cjson/cJSON.h"
+
+// Global variables
+volatile sig_atomic_t running = 1;
+nostr_relay_pool_t* pool = NULL;
+nostr_pool_subscription_t** subscriptions = NULL;
+int subscription_count = 0;
+int subscription_capacity = 0;
+pthread_t poll_thread;
+int log_fd = -1;
+
+// Signal handler for clean shutdown
+void signal_handler(int signum) {
+    (void)signum;
+    running = 0;
+}
+
+// Event callback - called when an event is received
+void on_event(cJSON* event, const char* relay_url, void* user_data) {
+    (void)user_data;
+
+    // Extract basic event information
+    cJSON* id = cJSON_GetObjectItem(event, "id");
+    cJSON* pubkey = cJSON_GetObjectItem(event, "pubkey");
+    cJSON* created_at = cJSON_GetObjectItem(event, "created_at");
+    cJSON* kind = cJSON_GetObjectItem(event, "kind");
+    cJSON* content = cJSON_GetObjectItem(event, "content");
+
+    time_t now = time(NULL);
+    char timestamp[26];
+    ctime_r(&now, timestamp);
+    timestamp[24] = '\0'; // Remove newline
+
+    dprintf(log_fd, "[%s] 📨 EVENT from %s\n", timestamp, relay_url);
+    dprintf(log_fd, "├── ID: %.12s...\n", id && cJSON_IsString(id) ? cJSON_GetStringValue(id) : "unknown");
+    dprintf(log_fd, "├── Pubkey: %.12s...\n", pubkey && cJSON_IsString(pubkey) ? cJSON_GetStringValue(pubkey) : "unknown");
+    dprintf(log_fd, "├── Kind: %d\n", kind && cJSON_IsNumber(kind) ? (int)cJSON_GetNumberValue(kind) : -1);
+    dprintf(log_fd, "├── Created: %lld\n", created_at && cJSON_IsNumber(created_at) ? (long long)cJSON_GetNumberValue(created_at) : 0);
+
+    // Truncate content if too long
+    if (content && cJSON_IsString(content)) {
+        const char* content_str = cJSON_GetStringValue(content);
+        size_t content_len = strlen(content_str);
+        if (content_len > 100) {
+            dprintf(log_fd, "└── Content: %.97s...\n", content_str);
+        } else {
+            dprintf(log_fd, "└── Content: %s\n", content_str);
+        }
+    } else {
+        dprintf(log_fd, "└── Content: (empty)\n");
+    }
+    dprintf(log_fd, "\n");
+}
+
+// EOSE callback - called when End of Stored Events is received
+void on_eose(cJSON** events, int event_count, void* user_data) {
+    (void)user_data;
+    time_t now = time(NULL);
+    char timestamp[26];
+    ctime_r(&now, timestamp);
+    timestamp[24] = '\0';
+    dprintf(log_fd, "[%s] 📋 EOSE received - %d events collected\n", timestamp, event_count);
+
+    // Log collected events if any
+    for (int i = 0; i < event_count; i++) {
+        cJSON* id = cJSON_GetObjectItem(events[i], "id");
+        if (id && cJSON_IsString(id)) {
+            dprintf(log_fd, "  Event %d: %.12s...\n", i + 1, cJSON_GetStringValue(id));
+        }
+    }
+    dprintf(log_fd, "\n");
+}
+
+// Background polling thread
+void* poll_thread_func(void* arg) {
+    (void)arg;
+
+    while (running) {
+        if (pool) {
+            nostr_relay_pool_poll(pool, 100);
+        }
+        struct timespec ts = {0, 10000000}; // 10ms
+        nanosleep(&ts, NULL);
+    }
+
+    return NULL;
+}
+
+// Print menu
+void print_menu() {
+    printf("\n=== NOSTR Relay Pool Test Menu ===\n");
+    printf("1. Start Pool (ws://localhost:7555)\n");
+    printf("2. Stop Pool\n");
+    printf("3. Add relay to pool\n");
+    printf("4. Remove relay from pool\n");
+    printf("5. Add subscription\n");
+    printf("6. Remove subscription\n");
+    printf("7. Show pool status\n");
+    printf("8. Test reconnection (simulate disconnect)\n");
+    printf("9. Publish Event\n");
+    printf("0. Exit\n");
+    printf("Choice: ");
+}
+
+// Get user input with default
+char* get_input(const char* prompt, const char* default_value) {
+    static char buffer[1024];
+    printf("%s", prompt);
+    if (default_value) {
+        printf(" [%s]", default_value);
+    }
+    printf(": ");
+
+    if (!fgets(buffer, sizeof(buffer), stdin)) {
+        return NULL;
+    }
+
+    // Remove newline
+    size_t len = strlen(buffer);
+    if (len > 0 && buffer[len-1] == '\n') {
+        buffer[len-1] = '\0';
+    }
+
+    // Return default if empty
+    if (strlen(buffer) == 0 && default_value) {
+        return strdup(default_value);
+    }
+
+    return strdup(buffer);
+}
+
+// Parse comma-separated list into cJSON array
+cJSON* parse_comma_list(const char* input, int is_number) {
+    if (!input || strlen(input) == 0) {
+        return NULL;
+    }
+
+    cJSON* array = cJSON_CreateArray();
+    if (!array) return NULL;
+
+    char* input_copy = strdup(input);
+    char* token = strtok(input_copy, ",");
+
+    while (token) {
+        // Trim whitespace
+        while (*token == ' ') token++;
+        char* end = token + strlen(token) - 1;
+        while (end > token && *end == ' ') *end-- = '\0';
+
+        if (is_number) {
+            int num = atoi(token);
+            cJSON_AddItemToArray(array, cJSON_CreateNumber(num));
+        } else {
+            cJSON_AddItemToArray(array, cJSON_CreateString(token));
+        }
+
+        token = strtok(NULL, ",");
+    }
+
+    free(input_copy);
+    return array;
+}
+
+// Add subscription interactively
+void add_subscription() {
+    if (!pool) {
+        printf("❌ Pool not started\n");
+        return;
+    }
+
+    printf("\n--- Add Subscription ---\n");
+    printf("Enter filter values (press Enter for no value):\n");
+
+    cJSON* filter = cJSON_CreateObject();
+
+    // ids
+    char* ids_input = get_input("ids (comma-separated event ids)", NULL);
+    if (ids_input && strlen(ids_input) > 0) {
+        cJSON* ids = parse_comma_list(ids_input, 0);
+        if (ids) cJSON_AddItemToObject(filter, "ids", ids);
+    }
+    free(ids_input);
+
+    // authors
+    char* authors_input = get_input("authors (comma-separated pubkeys)", NULL);
+    if (authors_input && strlen(authors_input) > 0) {
+        cJSON* authors = parse_comma_list(authors_input, 0);
+        if (authors) cJSON_AddItemToObject(filter, "authors", authors);
+    }
+    free(authors_input);
+
+    // kinds
+    char* kinds_input = get_input("kinds (comma-separated numbers)", NULL);
+    if (kinds_input && strlen(kinds_input) > 0) {
+        cJSON* kinds = parse_comma_list(kinds_input, 1);
+        if (kinds) cJSON_AddItemToObject(filter, "kinds", kinds);
+    }
+    free(kinds_input);
+
+    // #e tag
+    char* e_input = get_input("#e (comma-separated event ids)", NULL);
+    if (e_input && strlen(e_input) > 0) {
+        cJSON* e_array = parse_comma_list(e_input, 0);
+        if (e_array) cJSON_AddItemToObject(filter, "#e", e_array);
+    }
+    free(e_input);
+
+    // #p tag
+    char* p_input = get_input("#p (comma-separated pubkeys)", NULL);
+    if (p_input && strlen(p_input) > 0) {
+        cJSON* p_array = parse_comma_list(p_input, 0);
+        if (p_array) cJSON_AddItemToObject(filter, "#p", p_array);
+    }
+    free(p_input);
+
+    // since
+    char* since_input = get_input("since (unix timestamp or 'n' for now)", NULL);
+    if (since_input && strlen(since_input) > 0) {
+        if (strcmp(since_input, "n") == 0) {
+            // Use current timestamp
+            time_t now = time(NULL);
+            cJSON_AddItemToObject(filter, "since", cJSON_CreateNumber((int)now));
+            printf("Using current timestamp: %ld\n", now);
+        } else {
+            int since = atoi(since_input);
+            if (since > 0) cJSON_AddItemToObject(filter, "since", cJSON_CreateNumber(since));
+        }
+    }
+    free(since_input);
+
+    // until
+    char* until_input = get_input("until (unix timestamp)", NULL);
+    if (until_input && strlen(until_input) > 0) {
+        int until = atoi(until_input);
+        if (until > 0) cJSON_AddItemToObject(filter, "until", cJSON_CreateNumber(until));
+    }
+    free(until_input);
+
+    // limit
+    char* limit_input = get_input("limit (max events)", "10");
+    if (limit_input && strlen(limit_input) > 0) {
+        int limit = atoi(limit_input);
+        if (limit > 0) cJSON_AddItemToObject(filter, "limit", cJSON_CreateNumber(limit));
+    }
+    free(limit_input);
+
+    // Get relay URLs from pool
+    char** relay_urls = NULL;
+    nostr_pool_relay_status_t* statuses = NULL;
+    int relay_count = nostr_relay_pool_list_relays(pool, &relay_urls, &statuses);
+
+    if (relay_count <= 0) {
+        printf("❌ No relays in pool\n");
+        cJSON_Delete(filter);
+        return;
+    }
+
+    // Ask about close_on_eose behavior
+    char* close_input = get_input("Close subscription on EOSE? (y/n)", "n");
+    int close_on_eose = (close_input && strcmp(close_input, "y") == 0) ? 1 : 0;
+    free(close_input);
+
+    // Create subscription with new parameters
+    nostr_pool_subscription_t* sub = nostr_relay_pool_subscribe(
+        pool,
+        (const char**)relay_urls,
+        relay_count,
+        filter,
+        on_event,
+        on_eose,
+        NULL,
+        close_on_eose,
+        1,  // enable_deduplication
+        NOSTR_POOL_EOSE_FULL_SET,  // result_mode
+        30,  // relay_timeout_seconds
+        60   // eose_timeout_seconds
+    );
+
+    // Free relay URLs
+    for (int i = 0; i < relay_count; i++) {
+        free(relay_urls[i]);
+    }
+    free(relay_urls);
+    free(statuses);
+
+    if (!sub) {
+        printf("❌ Failed to create subscription\n");
+        cJSON_Delete(filter);
+        return;
+    }
+
+    // Store subscription
+    if (subscription_count >= subscription_capacity) {
+        subscription_capacity = subscription_capacity == 0 ? 10 : subscription_capacity * 2;
+        subscriptions = realloc(subscriptions, subscription_capacity * sizeof(nostr_pool_subscription_t*));
+    }
+    subscriptions[subscription_count++] = sub;
+
+    printf("✅ Subscription created (ID: %d)\n", subscription_count);
+
+    // Log the filter
+    char* filter_json = cJSON_Print(filter);
+    time_t now = time(NULL);
+    char timestamp[26];
+    ctime_r(&now, timestamp);
+    timestamp[24] = '\0';
+    dprintf(log_fd, "[%s] 🔍 New subscription created (ID: %d)\n", timestamp, subscription_count);
+    dprintf(log_fd, "Filter: %s\n\n", filter_json);
+    free(filter_json);
+}
+
+// Remove subscription
+void remove_subscription() {
+    if (subscription_count == 0) {
+        printf("❌ No subscriptions to remove\n");
+        return;
+    }
+
+    printf("\n--- Remove Subscription ---\n");
+    printf("Available subscriptions:\n");
+    for (int i = 0; i < subscription_count; i++) {
+        printf("%d. Subscription %d\n", i + 1, i + 1);
+    }
+
+    char* choice_input = get_input("Enter subscription number to remove", NULL);
+    if (!choice_input || strlen(choice_input) == 0) {
+        free(choice_input);
+        return;
+    }
+
+    int choice = atoi(choice_input) - 1;
+    free(choice_input);
+
+    if (choice < 0 || choice >= subscription_count) {
+        printf("❌ Invalid subscription number\n");
+        return;
+    }
+
+    nostr_pool_subscription_close(subscriptions[choice]);
+
+    // Shift remaining subscriptions
+    for (int i = choice; i < subscription_count - 1; i++) {
+        subscriptions[i] = subscriptions[i + 1];
+    }
+    subscription_count--;
+
+    printf("✅ Subscription removed\n");
+
+    time_t now = time(NULL);
+    char timestamp[26];
+    ctime_r(&now, timestamp);
+    timestamp[24] = '\0';
+    dprintf(log_fd, "[%s] 🗑️ Subscription removed (was ID: %d)\n\n", timestamp, choice + 1);
+}
+
+// Show pool status
+void show_pool_status() {
+    if (!pool) {
+        printf("❌ Pool not started\n");
+        return;
+    }
+
+    // Give polling thread time to establish connections
+    printf("⏳ Waiting for connections to establish...\n");
+    sleep(3);
+
+    char** relay_urls = NULL;
+    nostr_pool_relay_status_t* statuses = NULL;
+    int relay_count = nostr_relay_pool_list_relays(pool, &relay_urls, &statuses);
+
+    printf("\n📊 POOL STATUS\n");
+    printf("Relays: %d\n", relay_count);
+    printf("Subscriptions: %d\n", subscription_count);
+
+    if (relay_count > 0) {
+        printf("\nRelay Details:\n");
+        for (int i = 0; i < relay_count; i++) {
+            const char* status_str;
+            switch (statuses[i]) {
+                case NOSTR_POOL_RELAY_CONNECTED: status_str = "🟢 CONNECTED"; break;
+                case NOSTR_POOL_RELAY_CONNECTING: status_str = "🟡 CONNECTING"; break;
+                case NOSTR_POOL_RELAY_DISCONNECTED: status_str = "⚪ DISCONNECTED"; break;
+                case NOSTR_POOL_RELAY_ERROR: status_str = "🔴 ERROR"; break;
+                default: status_str = "❓ UNKNOWN"; break;
+            }
+
+            printf("├── %s: %s\n", relay_urls[i], status_str);
+
+            // Show connection and publish error details
+            const char* conn_error = nostr_relay_pool_get_relay_last_connection_error(pool, relay_urls[i]);
+            const char* pub_error = nostr_relay_pool_get_relay_last_publish_error(pool, relay_urls[i]);
+            
+            if (conn_error) {
+                printf("│   ├── Connection error: %s\n", conn_error);
+            }
+            if (pub_error) {
+                printf("│   ├── Last publish error: %s\n", pub_error);
+            }
+
+            const nostr_relay_stats_t* stats = nostr_relay_pool_get_relay_stats(pool, relay_urls[i]);
+            if (stats) {
+                printf("│   ├── Events received: %d\n", stats->events_received);
+                printf("│   ├── Connection attempts: %d\n", stats->connection_attempts);
+                printf("│   ├── Connection failures: %d\n", stats->connection_failures);
+                printf("│   ├── Events published: %d (OK: %d, Failed: %d)\n",
+                       stats->events_published, stats->events_published_ok, stats->events_published_failed);
+                printf("│   ├── Ping latency: %.2f ms\n", stats->ping_latency_current);
+                printf("│   └── Query latency: %.2f ms\n", stats->query_latency_avg);
+            }
+
+            free(relay_urls[i]);
+        }
+        free(relay_urls);
+        free(statuses);
+    }
+    printf("\n");
+}
+
+
+// Async publish callback context
+typedef struct {
+    int total_relays;
+    int responses_received;
+    int success_count;
+    time_t start_time;
+} async_publish_context_t;
+
+// Async publish callback - called for each relay response
+void async_publish_callback(const char* relay_url, const char* event_id,
+                           int success, const char* message, void* user_data) {
+    async_publish_context_t* ctx = (async_publish_context_t*)user_data;
+    
+    ctx->responses_received++;
+    if (success) {
+        ctx->success_count++;
+    }
+    
+    // Calculate elapsed time
+    time_t now = time(NULL);
+    double elapsed = difftime(now, ctx->start_time);
+    
+    // Log to file with real-time feedback
+    char timestamp[26];
+    ctime_r(&now, timestamp);
+    timestamp[24] = '\0';
+    
+    if (success) {
+        printf("✅ %s: Published successfully (%.1fs)\n", relay_url, elapsed);
+        dprintf(log_fd, "[%s] ✅ ASYNC: %s published successfully (%.1fs)\n",
+                timestamp, relay_url, elapsed);
+    } else {
+        printf("❌ %s: Failed - %s (%.1fs)\n", relay_url, message ? message : "unknown error", elapsed);
+        dprintf(log_fd, "[%s] ❌ ASYNC: %s failed - %s (%.1fs)\n",
+                timestamp, relay_url, message ? message : "unknown error", elapsed);
+    }
+    
+    // Show progress
+    printf("   Progress: %d/%d responses received\n", ctx->responses_received, ctx->total_relays);
+    
+    if (ctx->responses_received >= ctx->total_relays) {
+        printf("\n🎉 All relays responded! Final result: %d/%d successful\n",
+               ctx->success_count, ctx->total_relays);
+        dprintf(log_fd, "[%s] 🎉 ASYNC: All relays responded - %d/%d successful\n\n",
+                timestamp, ctx->success_count, ctx->total_relays);
+    }
+}
+
+// Publish test event with async callbacks
+void publish_event() {
+    if (!pool) {
+        printf("❌ Pool not started\n");
+        return;
+    }
+
+    printf("\n--- Publish Test Event ---\n");
+
+    // Generate random keypair
+    unsigned char private_key[32], public_key[32];
+    if (nostr_generate_keypair(private_key, public_key) != NOSTR_SUCCESS) {
+        printf("❌ Failed to generate keypair\n");
+        return;
+    }
+
+    // Get current timestamp
+    time_t now = time(NULL);
+
+    // Format content with date/time
+    char content[256];
+    struct tm* tm_info = localtime(&now);
+    strftime(content, sizeof(content), "Test post at %Y-%m-%d %H:%M:%S", tm_info);
+
+    // Create kind 1 event
+    cJSON* event = nostr_create_and_sign_event(1, content, NULL, private_key, now);
+    if (!event) {
+        printf("❌ Failed to create event\n");
+        return;
+    }
+
+    // Get relay URLs from pool
+    char** relay_urls = NULL;
+    nostr_pool_relay_status_t* statuses = NULL;
+    int relay_count = nostr_relay_pool_list_relays(pool, &relay_urls, &statuses);
+
+    if (relay_count <= 0) {
+        printf("❌ No relays in pool\n");
+        cJSON_Delete(event);
+        return;
+    }
+
+    printf("📤 Publishing event to %d relay(s)...\n", relay_count);
+    printf("Watch for real-time responses below:\n\n");
+
+    // Setup callback context
+    async_publish_context_t ctx = {0};
+    ctx.total_relays = relay_count;
+    ctx.start_time = time(NULL);
+
+    // Log the event
+    char* event_json = cJSON_Print(event);
+    char timestamp[26];
+    ctime_r(&now, timestamp);
+    timestamp[24] = '\0';
+    dprintf(log_fd, "[%s] 📤 Publishing test event\n", timestamp);
+    dprintf(log_fd, "Event: %s\n\n", event_json);
+    free(event_json);
+
+    // Publish using async function
+    int sent_count = nostr_relay_pool_publish_async(pool, (const char**)relay_urls,
+                                                   relay_count, event,
+                                                   async_publish_callback, &ctx);
+
+    if (sent_count > 0) {
+        printf("📡 Event sent to %d/%d relays, waiting for responses...\n\n",
+               sent_count, relay_count);
+        
+        // Wait for all responses or timeout (10 seconds)
+        time_t wait_start = time(NULL);
+        while (ctx.responses_received < ctx.total_relays &&
+               (time(NULL) - wait_start) < 10) {
+            // Let the polling thread process messages
+            usleep(100000); // 100ms
+        }
+        
+        if (ctx.responses_received < ctx.total_relays) {
+            printf("\n⏰ Timeout reached - %d/%d relays responded\n",
+                   ctx.responses_received, ctx.total_relays);
+        }
+    } else {
+        printf("❌ Failed to send event to any relays\n");
+    }
+
+    // Cleanup
+    for (int i = 0; i < relay_count; i++) {
+        free(relay_urls[i]);
+    }
+    free(relay_urls);
+    free(statuses);
+    cJSON_Delete(event);
+}
+
+int main() {
+    // Setup logging to file
+    log_fd = open("pool.log", O_WRONLY | O_CREAT | O_TRUNC, 0644);
+    if (log_fd == -1) {
+        fprintf(stderr, "❌ Failed to open pool.log for writing\n");
+        return 1;
+    }
+
+    // Initialize NOSTR library
+    if (nostr_init() != NOSTR_SUCCESS) {
+        fprintf(stderr, "❌ Failed to initialize NOSTR library\n");
+        close(log_fd);
+        return 1;
+    }
+
+    // Setup signal handler
+    signal(SIGINT, signal_handler);
+    signal(SIGTERM, signal_handler);
+
+    // Start polling thread
+    if (pthread_create(&poll_thread, NULL, poll_thread_func, NULL) != 0) {
+        fprintf(stderr, "❌ Failed to create polling thread\n");
+        nostr_cleanup();
+        close(log_fd);
+        return 1;
+    }
+
+    printf("🔗 NOSTR Relay Pool Interactive Test\n");
+    printf("=====================================\n");
+    printf("All event output is logged to pool.log\n");
+    printf("Press Ctrl+C to exit\n\n");
+
+    time_t now = time(NULL);
+    char timestamp[26];
+    ctime_r(&now, timestamp);
+    timestamp[24] = '\0';
+    dprintf(log_fd, "[%s] 🚀 Pool test started\n\n", timestamp);
+
+    // Main menu loop
+    while (running) {
+        print_menu();
+
+        char choice;
+        if (scanf("%c", &choice) != 1) {
+            break;
+        }
+
+        // Consume newline
+        int c;
+        while ((c = getchar()) != '\n' && c != EOF);
+
+        switch (choice) {
+            case '1': { // Start Pool
+                if (pool) {
+                    printf("❌ Pool already started\n");
+                    break;
+                }
+
+                // Create pool with custom reconnection configuration for faster testing
+                nostr_pool_reconnect_config_t config = *nostr_pool_reconnect_config_default();
+                config.ping_interval_seconds = 5; // Ping every 5 seconds for testing
+                pool = nostr_relay_pool_create(&config);
+                if (!pool) {
+                    printf("❌ Failed to create pool\n");
+                    break;
+                }
+
+                if (nostr_relay_pool_add_relay(pool, "ws://localhost:7555") != NOSTR_SUCCESS) {
+                    printf("❌ Failed to add default relay\n");
+                    nostr_relay_pool_destroy(pool);
+                    pool = NULL;
+                    break;
+                }
+
+                printf("✅ Pool started with ws://localhost:7555\n");
+
+                now = time(NULL);
+                ctime_r(&now, timestamp);
+                timestamp[24] = '\0';
+                dprintf(log_fd, "[%s] 🏊 Pool started with default relay\n\n", timestamp);
+                break;
+            }
+
+            case '2': { // Stop Pool
+                if (!pool) {
+                    printf("❌ Pool not started\n");
+                    break;
+                }
+
+                // Close all subscriptions
+                for (int i = 0; i < subscription_count; i++) {
+                    if (subscriptions[i]) {
+                        nostr_pool_subscription_close(subscriptions[i]);
+                    }
+                }
+                free(subscriptions);
+                subscriptions = NULL;
+                subscription_count = 0;
+                subscription_capacity = 0;
+
+                nostr_relay_pool_destroy(pool);
+                pool = NULL;
+
+                printf("✅ Pool stopped\n");
+
+                now = time(NULL);
+                ctime_r(&now, timestamp);
+                timestamp[24] = '\0';
+                dprintf(log_fd, "[%s] 🛑 Pool stopped\n\n", timestamp);
+                break;
+            }
+
+            case '3': { // Add relay
+                if (!pool) {
+                    printf("❌ Pool not started\n");
+                    break;
+                }
+
+                char* url = get_input("Enter relay URL", "wss://relay.example.com");
+                if (url && strlen(url) > 0) {
+                    if (nostr_relay_pool_add_relay(pool, url) == NOSTR_SUCCESS) {
+                        printf("✅ Relay added: %s\n", url);
+                        printf("⏳ Attempting to connect...\n");
+                        
+                        // Give it a moment to attempt connection
+                        sleep(2);
+                        
+                        // Check connection status and show any errors
+                        nostr_pool_relay_status_t status = nostr_relay_pool_get_relay_status(pool, url);
+                        const char* error_msg = nostr_relay_pool_get_relay_last_connection_error(pool, url);
+                        
+                        switch (status) {
+                            case NOSTR_POOL_RELAY_CONNECTED:
+                                printf("🟢 Successfully connected to %s\n", url);
+                                break;
+                            case NOSTR_POOL_RELAY_CONNECTING:
+                                printf("🟡 Still connecting to %s...\n", url);
+                                break;
+                            case NOSTR_POOL_RELAY_DISCONNECTED:
+                                printf("⚪ Disconnected from %s\n", url);
+                                if (error_msg) {
+                                    printf("   Last error: %s\n", error_msg);
+                                }
+                                break;
+                            case NOSTR_POOL_RELAY_ERROR:
+                                printf("🔴 Connection error for %s\n", url);
+                                if (error_msg) {
+                                    printf("   Error details: %s\n", error_msg);
+                                }
+                                break;
+                            default:
+                                printf("❓ Unknown status for %s\n", url);
+                                break;
+                        }
+
+                        now = time(NULL);
+                        ctime_r(&now, timestamp);
+                        timestamp[24] = '\0';
+                        dprintf(log_fd, "[%s] ➕ Relay added: %s (status: %d)\n", timestamp, url, status);
+                        if (error_msg) {
+                            dprintf(log_fd, "   Connection error: %s\n", error_msg);
+                        }
+                        dprintf(log_fd, "\n");
+                    } else {
+                        printf("❌ Failed to add relay to pool\n");
+                    }
+                }
+                free(url);
+                break;
+            }
+
+            case '4': { // Remove relay
+                if (!pool) {
+                    printf("❌ Pool not started\n");
+                    break;
+                }
+
+                char* url = get_input("Enter relay URL to remove", NULL);
+                if (url && strlen(url) > 0) {
+                    if (nostr_relay_pool_remove_relay(pool, url) == NOSTR_SUCCESS) {
+                        printf("✅ Relay removed: %s\n", url);
+
+                        now = time(NULL);
+                        ctime_r(&now, timestamp);
+                        timestamp[24] = '\0';
+                        dprintf(log_fd, "[%s] ➖ Relay removed: %s\n\n", timestamp, url);
+                    } else {
+                        printf("❌ Failed to remove relay\n");
+                    }
+                }
+                free(url);
+                break;
+            }
+
+            case '5': // Add subscription
+                add_subscription();
+                break;
+
+            case '6': // Remove subscription
+                remove_subscription();
+                break;
+
+            case '7': // Show status
+                show_pool_status();
+                break;
+
+            case '8': { // Test reconnection
+                if (!pool) {
+                    printf("❌ Pool not started\n");
+                    break;
+                }
+
+                char** relay_urls = NULL;
+                nostr_pool_relay_status_t* statuses = NULL;
+                int relay_count = nostr_relay_pool_list_relays(pool, &relay_urls, &statuses);
+
+                if (relay_count <= 0) {
+                    printf("❌ No relays in pool\n");
+                    break;
+                }
+
+                printf("\n--- Test Reconnection ---\n");
+                printf("Available relays:\n");
+                for (int i = 0; i < relay_count; i++) {
+                    printf("%d. %s (%s)\n", i + 1, relay_urls[i],
+                           statuses[i] == NOSTR_POOL_RELAY_CONNECTED ? "CONNECTED" : "NOT CONNECTED");
+                }
+
+                char* choice_input = get_input("Enter relay number to test reconnection with", NULL);
+                if (!choice_input || strlen(choice_input) == 0) {
+                    for (int i = 0; i < relay_count; i++) free(relay_urls[i]);
+                    free(relay_urls);
+                    free(statuses);
+                    free(choice_input);
+                    break;
+                }
+
+                int choice = atoi(choice_input) - 1;
+                free(choice_input);
+
+                if (choice < 0 || choice >= relay_count) {
+                    printf("❌ Invalid relay number\n");
+                    for (int i = 0; i < relay_count; i++) free(relay_urls[i]);
+                    free(relay_urls);
+                    free(statuses);
+                    break;
+                }
+
+                printf("🔄 Testing reconnection with %s...\n", relay_urls[choice]);
+                printf("   The pool is configured with automatic reconnection enabled.\n");
+                printf("   If the connection drops, it will automatically attempt to reconnect\n");
+                printf("   with exponential backoff (1s → 2s → 4s → 8s → 16s → 30s max).\n");
+                printf("   Connection health is monitored with ping/pong every 30 seconds.\n");
+
+                time_t now = time(NULL);
+                char timestamp[26];
+                ctime_r(&now, timestamp);
+                timestamp[24] = '\0';
+                dprintf(log_fd, "[%s] 🔄 TEST: Testing reconnection behavior with %s\n", timestamp, relay_urls[choice]);
+                dprintf(log_fd, "   Pool configured with: auto-reconnect=ON, max_attempts=10, ping_interval=30s\n\n");
+
+                printf("✅ Reconnection test initiated. Monitor the status and logs for reconnection activity.\n");
+
+                for (int i = 0; i < relay_count; i++) free(relay_urls[i]);
+                free(relay_urls);
+                free(statuses);
+                break;
+            }
+
+            case '9': // Publish Event
+                publish_event();
+                break;
+
+            case '0': // Exit
+                running = 0;
+                break;
+
+            default:
+                printf("❌ Invalid choice\n");
+                break;
+        }
+    }
+
+    printf("\n🧹 Cleaning up...\n");
+
+    // Stop polling thread
+    running = 0;
+    pthread_join(poll_thread, NULL);
+
+    // Clean up pool and subscriptions
+    if (pool) {
+        for (int i = 0; i < subscription_count; i++) {
+            if (subscriptions[i]) {
+                nostr_pool_subscription_close(subscriptions[i]);
+            }
+        }
+        free(subscriptions);
+        nostr_relay_pool_destroy(pool);
+        printf("✅ Pool destroyed\n");
+    }
+
+    // Cleanup
+    nostr_cleanup();
+    close(log_fd);
+
+    printf("👋 Test completed\n");
+    return 0;
+}
@@ -0,0 +1,242 @@
+/*
+ * NIP-17 Private Direct Messages - Command Line Application
+ *
+ * This example demonstrates how to send NIP-17 private direct messages
+ * using the Nostr Core Library.
+ *
+ * Usage:
+ *   ./send_nip17_dm <recipient_pubkey> <message> [sender_nsec]
+ *
+ * Arguments:
+ *   recipient_pubkey: The npub or hex public key of the recipient
+ *   message: The message to send
+ *   sender_nsec: (optional) The nsec private key to use for sending.
+ *                If not provided, uses a default test key.
+ *
+ * Example:
+ *   ./send_nip17_dm npub1example... "Hello from NIP-17!" nsec1test...
+ */
+
+#define _GNU_SOURCE
+#define _POSIX_C_SOURCE 200809L
+
+#include "../nostr_core/nostr_core.h"
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+
+// Default test private key (for demonstration - DO NOT USE IN PRODUCTION)
+#define DEFAULT_SENDER_NSEC "nsec12kgt0dv2k2safv6s32w8f89z9uw27e68hjaa0d66c5xvk70ezpwqncd045"
+
+// Default relay for sending DMs
+#define DEFAULT_RELAY "wss://relay.laantungir.net"
+
+// Progress callback for publishing
+void publish_progress_callback(const char* relay_url, const char* status,
+                              const char* message, int success_count,
+                              int total_relays, int completed_relays, void* user_data) {
+    (void)user_data;
+
+    if (relay_url) {
+        printf("📡 [%s]: %s", relay_url, status);
+        if (message) {
+            printf(" - %s", message);
+        }
+        printf(" (%d/%d completed, %d successful)\n", completed_relays, total_relays, success_count);
+    } else {
+        printf("📡 PUBLISH COMPLETE: %d/%d successful\n", success_count, total_relays);
+    }
+}
+
+/**
+ * Convert npub to hex if needed
+ */
+int convert_pubkey_to_hex(const char* input_pubkey, char* output_hex) {
+    // Check if it's already hex (64 characters)
+    if (strlen(input_pubkey) == 64) {
+        // Assume it's already hex
+        strcpy(output_hex, input_pubkey);
+        return 0;
+    }
+
+    // Check if it's an npub (starts with "npub1")
+    if (strncmp(input_pubkey, "npub1", 5) == 0) {
+        // Convert npub to hex
+        unsigned char pubkey_bytes[32];
+        if (nostr_decode_npub(input_pubkey, pubkey_bytes) != 0) {
+            fprintf(stderr, "Error: Invalid npub format\n");
+            return -1;
+        }
+        nostr_bytes_to_hex(pubkey_bytes, 32, output_hex);
+        return 0;
+    }
+
+    fprintf(stderr, "Error: Public key must be 64-character hex or valid npub\n");
+    return -1;
+}
+
+/**
+ * Convert nsec to private key bytes if needed
+ */
+int convert_nsec_to_private_key(const char* input_nsec, unsigned char* private_key) {
+    // Check if it's already hex (64 characters)
+    if (strlen(input_nsec) == 64) {
+        // Convert hex to bytes
+        if (nostr_hex_to_bytes(input_nsec, private_key, 32) != 0) {
+            fprintf(stderr, "Error: Invalid hex private key\n");
+            return -1;
+        }
+        return 0;
+    }
+
+    // Check if it's an nsec (starts with "nsec1")
+    if (strncmp(input_nsec, "nsec1", 5) == 0) {
+        // Convert nsec directly to private key bytes
+        if (nostr_decode_nsec(input_nsec, private_key) != 0) {
+            fprintf(stderr, "Error: Invalid nsec format\n");
+            return -1;
+        }
+        return 0;
+    }
+
+    fprintf(stderr, "Error: Private key must be 64-character hex or valid nsec\n");
+    return -1;
+}
+
+/**
+ * Main function
+ */
+int main(int argc, char* argv[]) {
+    if (argc < 3 || argc > 4) {
+        fprintf(stderr, "Usage: %s <recipient_pubkey> <message> [sender_nsec]\n\n", argv[0]);
+        fprintf(stderr, "Arguments:\n");
+        fprintf(stderr, "  recipient_pubkey: npub or hex public key of recipient\n");
+        fprintf(stderr, "  message: The message to send\n");
+        fprintf(stderr, "  sender_nsec: (optional) nsec private key. Uses test key if not provided.\n\n");
+        fprintf(stderr, "Example:\n");
+        fprintf(stderr, "  %s npub1example... \"Hello!\" nsec1test...\n", argv[0]);
+        return 1;
+    }
+
+    const char* recipient_pubkey_input = argv[1];
+    const char* message = argv[2];
+    const char* sender_nsec_input = (argc >= 4) ? argv[3] : DEFAULT_SENDER_NSEC;
+
+    printf("🧪 NIP-17 Private Direct Message Sender\n");
+    printf("======================================\n\n");
+
+    // Initialize crypto
+    if (nostr_init() != NOSTR_SUCCESS) {
+        fprintf(stderr, "Failed to initialize crypto\n");
+        return 1;
+    }
+
+    // Convert recipient pubkey
+    char recipient_pubkey_hex[65];
+    if (convert_pubkey_to_hex(recipient_pubkey_input, recipient_pubkey_hex) != 0) {
+        return 1;
+    }
+
+    // Convert sender private key
+    unsigned char sender_privkey[32];
+    if (convert_nsec_to_private_key(sender_nsec_input, sender_privkey) != 0) {
+        return 1;
+    }
+
+    // Derive sender public key for display
+    unsigned char sender_pubkey_bytes[32];
+    char sender_pubkey_hex[65];
+    if (nostr_ec_public_key_from_private_key(sender_privkey, sender_pubkey_bytes) != 0) {
+        fprintf(stderr, "Failed to derive sender public key\n");
+        return 1;
+    }
+    nostr_bytes_to_hex(sender_pubkey_bytes, 32, sender_pubkey_hex);
+
+    printf("📤 Sender: %s\n", sender_pubkey_hex);
+    printf("📥 Recipient: %s\n", recipient_pubkey_hex);
+    printf("💬 Message: %s\n", message);
+    printf("🌐 Relay: %s\n\n", DEFAULT_RELAY);
+
+    // Create DM event
+    printf("💬 Creating DM event...\n");
+    const char* recipient_pubkeys[] = {recipient_pubkey_hex};
+    cJSON* dm_event = nostr_nip17_create_chat_event(
+        message,
+        recipient_pubkeys,
+        1,
+        "NIP-17 CLI",  // subject
+        NULL,          // no reply
+        DEFAULT_RELAY, // relay hint
+        sender_pubkey_hex
+    );
+
+    if (!dm_event) {
+        fprintf(stderr, "Failed to create DM event\n");
+        return 1;
+    }
+
+    printf("✅ Created DM event (kind 14)\n");
+
+    // Send DM (create gift wraps)
+    printf("🎁 Creating gift wraps...\n");
+    cJSON* gift_wraps[10];  // Max 10 gift wraps
+    int gift_wrap_count = nostr_nip17_send_dm(
+        dm_event,
+        recipient_pubkeys,
+        1,
+        sender_privkey,
+        gift_wraps,
+        10
+    );
+
+    cJSON_Delete(dm_event);  // Original DM event no longer needed
+
+    if (gift_wrap_count <= 0) {
+        fprintf(stderr, "Failed to create gift wraps\n");
+        return 1;
+    }
+
+    printf("✅ Created %d gift wrap(s)\n", gift_wrap_count);
+
+    // Publish the gift wrap to relay
+    printf("\n📤 Publishing gift wrap to relay...\n");
+
+    const char* relay_urls[] = {DEFAULT_RELAY};
+    int success_count = 0;
+    publish_result_t* publish_results = synchronous_publish_event_with_progress(
+        relay_urls,
+        1,  // single relay
+        gift_wraps[0],  // Send the first gift wrap
+        &success_count,
+        10,  // 10 second timeout
+        publish_progress_callback,
+        NULL,  // no user data
+        0,     // NIP-42 disabled
+        NULL   // no private key for auth
+    );
+
+    if (!publish_results || success_count != 1) {
+        fprintf(stderr, "\n❌ Failed to publish gift wrap (success_count: %d)\n", success_count);
+        // Clean up gift wraps
+        for (int i = 0; i < gift_wrap_count; i++) {
+            cJSON_Delete(gift_wraps[i]);
+        }
+        if (publish_results) free(publish_results);
+        return 1;
+    }
+
+    printf("\n✅ Successfully published NIP-17 DM!\n");
+
+    // Clean up
+    free(publish_results);
+    for (int i = 0; i < gift_wrap_count; i++) {
+        cJSON_Delete(gift_wraps[i]);
+    }
+
+    nostr_cleanup();
+
+    printf("\n🎉 DM sent successfully! The recipient can now decrypt it using their private key.\n");
+
+    return 0;
+}
@@ -0,0 +1,63 @@
+/*
+ * NOSTR Core Library - Version Test Example
+ * Simple version display using VERSION file
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include "nostr_core.h"
+
+// Simple function to read VERSION file if it exists
+static const char* get_version_from_file(void) {
+    static char version_buf[64] = {0};
+    FILE* f = fopen("VERSION", "r");
+    if (f) {
+        if (fgets(version_buf, sizeof(version_buf), f)) {
+            // Remove trailing newline
+            size_t len = strlen(version_buf);
+            if (len > 0 && version_buf[len-1] == '\n') {
+                version_buf[len-1] = '\0';
+            }
+        }
+        fclose(f);
+        return version_buf;
+    }
+    return "unknown";
+}
+
+int main() {
+    printf("NOSTR Core Library Version Test\n");
+    printf("===============================\n\n");
+    
+    // Initialize the library
+    if (nostr_init() != NOSTR_SUCCESS) {
+        printf("Failed to initialize NOSTR library\n");
+        return 1;
+    }
+    
+    // Display basic version information
+    const char* version = get_version_from_file();
+    printf("Library Version: %s\n", version);
+    printf("Library Status: Initialized successfully\n");
+    
+    // Test basic functionality
+    printf("\nLibrary Functionality Test:\n");
+    unsigned char private_key[32];
+    unsigned char public_key[32];
+    
+    if (nostr_generate_keypair(private_key, public_key) == NOSTR_SUCCESS) {
+        printf("✓ Key generation works\n");
+    } else {
+        printf("✗ Key generation failed\n");
+    }
+    
+    // Cleanup
+    nostr_cleanup();
+    
+    printf("\nVersion test completed successfully.\n");
+    printf("Note: This library no longer includes runtime version functions\n");
+    printf("      to avoid build issues when used as a submodule.\n");
+    
+    return 0;
+}
@@ -0,0 +1,151 @@
+#!/bin/bash
+
+# increment_and_push.sh - Version increment and git automation script
+# Usage: ./increment_and_push.sh "meaningful git comment"
+
+set -e  # Exit on error
+
+# Color constants
+RED='\033[31m'
+GREEN='\033[32m'
+YELLOW='\033[33m'
+BLUE='\033[34m'
+BOLD='\033[1m'
+RESET='\033[0m'
+
+# Function to print output with colors
+print_info() {
+    if [ "$USE_COLORS" = true ]; then
+        echo -e "${BLUE}[INFO]${RESET} $1"
+    else
+        echo "[INFO] $1"
+    fi
+}
+
+print_success() {
+    if [ "$USE_COLORS" = true ]; then
+        echo -e "${GREEN}${BOLD}[SUCCESS]${RESET} $1"
+    else
+        echo "[SUCCESS] $1"
+    fi
+}
+
+print_warning() {
+    if [ "$USE_COLORS" = true ]; then
+        echo -e "${YELLOW}[WARNING]${RESET} $1"
+    else
+        echo "[WARNING] $1"
+    fi
+}
+
+print_error() {
+    if [ "$USE_COLORS" = true ]; then
+        echo -e "${RED}${BOLD}[ERROR]${RESET} $1"
+    else
+        echo "[ERROR] $1"
+    fi
+}
+
+# Check if we're in the correct directory
+CURRENT_DIR=$(basename "$(pwd)")
+if [ "$CURRENT_DIR" != "nostr_core_lib" ]; then
+    print_error "Script must be run from the nostr_core_lib directory"
+    echo ""
+    echo "Current directory: $CURRENT_DIR"
+    echo "Expected directory: nostr_core_lib"
+    echo ""
+    echo "Please change to the nostr_core_lib directory first."
+    echo ""
+    exit 1
+fi
+
+# Check if git repository exists
+if ! git rev-parse --git-dir > /dev/null 2>&1; then
+    print_error "Not a git repository. Please initialize git first."
+    exit 1
+fi
+
+# Check if we have a commit message
+if [ $# -eq 0 ]; then
+    print_error "Usage: $0 \"meaningful git comment\""
+    echo ""
+    echo "Example: $0 \"Add enhanced subscription functionality\""
+    echo ""
+    exit 1
+fi
+
+COMMIT_MESSAGE="$1"
+
+# Check if nostr_core.h exists
+if [ ! -f "nostr_core/nostr_core.h" ]; then
+    print_error "nostr_core/nostr_core.h not found"
+    exit 1
+fi
+
+print_info "Starting version increment and push process..."
+
+# Extract current version from nostr_core.h
+CURRENT_VERSION=$(grep '#define VERSION ' nostr_core/nostr_core.h | cut -d'"' -f2)
+if [ -z "$CURRENT_VERSION" ]; then
+    print_error "Could not find VERSION define in nostr_core.h"
+    exit 1
+fi
+
+# Extract version components
+VERSION_MAJOR=$(grep '#define VERSION_MAJOR ' nostr_core/nostr_core.h | awk '{print $3}')
+VERSION_MINOR=$(grep '#define VERSION_MINOR ' nostr_core/nostr_core.h | awk '{print $3}')
+VERSION_PATCH=$(grep '#define VERSION_PATCH ' nostr_core/nostr_core.h | awk '{print $3}')
+
+if [ -z "$VERSION_MAJOR" ] || [ -z "$VERSION_MINOR" ] || [ -z "$VERSION_PATCH" ]; then
+    print_error "Could not extract version components from nostr_core.h"
+    exit 1
+fi
+
+print_info "Current version: $CURRENT_VERSION (Major: $VERSION_MAJOR, Minor: $VERSION_MINOR, Patch: $VERSION_PATCH)"
+
+# Increment patch version
+NEW_PATCH=$((VERSION_PATCH + 1))
+NEW_VERSION="v$VERSION_MAJOR.$VERSION_MINOR.$NEW_PATCH"
+
+print_info "New version will be: $NEW_VERSION"
+
+# Update version in nostr_core.h
+sed -i "s/#define VERSION .*/#define VERSION \"$NEW_VERSION\"/" nostr_core/nostr_core.h
+sed -i "s/#define VERSION_PATCH .*/#define VERSION_PATCH $NEW_PATCH/" nostr_core/nostr_core.h
+
+print_success "Updated version in nostr_core.h"
+
+# Check if VERSION file exists and update it
+if [ -f "VERSION" ]; then
+    echo "$VERSION_MAJOR.$VERSION_MINOR.$NEW_PATCH" > VERSION
+    print_success "Updated VERSION file"
+fi
+
+# Check git status
+if ! git diff --quiet; then
+    print_info "Adding changes to git..."
+    git add .
+
+    print_info "Committing changes..."
+    git commit -m "$COMMIT_MESSAGE"
+
+    print_success "Changes committed"
+else
+    print_warning "No changes to commit"
+fi
+
+# Create and push git tag
+print_info "Creating git tag: $NEW_VERSION"
+git tag "$NEW_VERSION"
+
+print_info "Pushing commits and tags..."
+CURRENT_BRANCH=$(git branch --show-current)
+git push origin "$CURRENT_BRANCH"
+git push origin "$NEW_VERSION"
+
+print_success "Version $NEW_VERSION successfully released!"
+print_info "Git commit: $COMMIT_MESSAGE"
+print_info "Tag: $NEW_VERSION"
+
+echo ""
+echo "🎉 Release complete! Version $NEW_VERSION is now live."
@@ -0,0 +1,395 @@
+/*
+ * Cashu Mint HTTP Client Implementation
+ */
+
+#include "cashu_mint.h"
+#include "../cjson/cJSON.h"
+#include <stdlib.h>
+#include <string.h>
+#include <stdio.h>
+
+#include <curl/curl.h>
+
+typedef struct {
+    char* data;
+    size_t size;
+    size_t capacity;
+} cashu_http_response_t;
+
+static char* cashu_strdup(const char* s) {
+    if (!s) return NULL;
+    size_t len = strlen(s);
+    char* out = (char*)malloc(len + 1);
+    if (!out) return NULL;
+    memcpy(out, s, len + 1);
+    return out;
+}
+
+static size_t cashu_write_callback(void* contents, size_t size, size_t nmemb, void* userp) {
+    cashu_http_response_t* response = (cashu_http_response_t*)userp;
+    size_t total_size = size * nmemb;
+
+    if (response->size + total_size + 1 > response->capacity) {
+        size_t new_capacity = response->capacity ? response->capacity * 2 : 1024;
+        while (new_capacity < response->size + total_size + 1) {
+            new_capacity *= 2;
+        }
+
+        char* new_data = (char*)realloc(response->data, new_capacity);
+        if (!new_data) return 0;
+
+        response->data = new_data;
+        response->capacity = new_capacity;
+    }
+
+    memcpy(response->data + response->size, contents, total_size);
+    response->size += total_size;
+    response->data[response->size] = '\0';
+
+    return total_size;
+}
+
+static int cashu_http_json_request(const char* method,
+                                   const char* url,
+                                   const char* body,
+                                   int timeout_seconds,
+                                   char** response_out,
+                                   long* status_out) {
+    if (!method || !url || !response_out) {
+        return NOSTR_ERROR_INVALID_INPUT;
+    }
+
+    *response_out = NULL;
+    if (status_out) *status_out = 0;
+
+    CURL* curl = curl_easy_init();
+    if (!curl) {
+        return NOSTR_ERROR_NETWORK_FAILED;
+    }
+
+    cashu_http_response_t response = {0};
+    response.capacity = 1024;
+    response.data = (char*)malloc(response.capacity);
+    if (!response.data) {
+        curl_easy_cleanup(curl);
+        return NOSTR_ERROR_MEMORY_FAILED;
+    }
+    response.data[0] = '\0';
+
+    struct curl_slist* headers = NULL;
+    headers = curl_slist_append(headers, "Accept: application/json");
+    headers = curl_slist_append(headers, "Content-Type: application/json");
+
+    curl_easy_setopt(curl, CURLOPT_URL, url);
+    curl_easy_setopt(curl, CURLOPT_HTTPHEADER, headers);
+    curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, (curl_write_callback)cashu_write_callback);
+    curl_easy_setopt(curl, CURLOPT_WRITEDATA, &response);
+    curl_easy_setopt(curl, CURLOPT_TIMEOUT, (long)(timeout_seconds > 0 ? timeout_seconds : 10));
+    curl_easy_setopt(curl, CURLOPT_FOLLOWLOCATION, 1L);
+    curl_easy_setopt(curl, CURLOPT_MAXREDIRS, 3L);
+    curl_easy_setopt(curl, CURLOPT_SSL_VERIFYPEER, 1L);
+    curl_easy_setopt(curl, CURLOPT_SSL_VERIFYHOST, 2L);
+    curl_easy_setopt(curl, CURLOPT_USERAGENT, "nostr-core/1.0");
+
+    if (strcmp(method, "POST") == 0) {
+        curl_easy_setopt(curl, CURLOPT_POST, 1L);
+        curl_easy_setopt(curl, CURLOPT_POSTFIELDS, body ? body : "{}");
+    }
+
+    CURLcode res = curl_easy_perform(curl);
+    long response_code = 0;
+    curl_easy_getinfo(curl, CURLINFO_RESPONSE_CODE, &response_code);
+
+    curl_slist_free_all(headers);
+    curl_easy_cleanup(curl);
+
+    if (status_out) *status_out = response_code;
+
+    if (res != CURLE_OK) {
+        free(response.data);
+        return NOSTR_ERROR_CASHU_HTTP_FAILED;
+    }
+
+    *response_out = response.data;
+    return NOSTR_SUCCESS;
+}
+
+static int cashu_parse_quote_common(cJSON* json,
+                                    cashu_mint_quote_t* mint_quote_out,
+                                    cashu_melt_quote_t* melt_quote_out) {
+    if (!json) return NOSTR_ERROR_CASHU_JSON_PARSE_FAILED;
+
+    cJSON* quote_id = cJSON_GetObjectItem(json, "quote");
+    cJSON* request = cJSON_GetObjectItem(json, "request");
+    cJSON* paid = cJSON_GetObjectItem(json, "paid");
+    cJSON* amount = cJSON_GetObjectItem(json, "amount");
+    cJSON* expiry = cJSON_GetObjectItem(json, "expiry");
+
+    if (mint_quote_out) {
+        memset(mint_quote_out, 0, sizeof(*mint_quote_out));
+        if (quote_id && cJSON_IsString(quote_id)) {
+            strncpy(mint_quote_out->quote_id, cJSON_GetStringValue(quote_id), sizeof(mint_quote_out->quote_id) - 1);
+        }
+        if (request && cJSON_IsString(request)) {
+            strncpy(mint_quote_out->payment_request, cJSON_GetStringValue(request), sizeof(mint_quote_out->payment_request) - 1);
+        }
+        if (paid && cJSON_IsBool(paid)) mint_quote_out->paid = cJSON_IsTrue(paid) ? 1 : 0;
+        if (amount && cJSON_IsNumber(amount)) mint_quote_out->amount = (uint64_t)cJSON_GetNumberValue(amount);
+        if (expiry && cJSON_IsNumber(expiry)) mint_quote_out->expiry = (time_t)cJSON_GetNumberValue(expiry);
+    }
+
+    if (melt_quote_out) {
+        memset(melt_quote_out, 0, sizeof(*melt_quote_out));
+        if (quote_id && cJSON_IsString(quote_id)) {
+            strncpy(melt_quote_out->quote_id, cJSON_GetStringValue(quote_id), sizeof(melt_quote_out->quote_id) - 1);
+        }
+        if (paid && cJSON_IsBool(paid)) melt_quote_out->paid = cJSON_IsTrue(paid) ? 1 : 0;
+        if (amount && cJSON_IsNumber(amount)) melt_quote_out->amount = (uint64_t)cJSON_GetNumberValue(amount);
+        if (expiry && cJSON_IsNumber(expiry)) melt_quote_out->expiry = (time_t)cJSON_GetNumberValue(expiry);
+
+        cJSON* fee_reserve = cJSON_GetObjectItem(json, "fee_reserve");
+        if (fee_reserve && cJSON_IsNumber(fee_reserve)) {
+            melt_quote_out->fee_reserve = (uint64_t)cJSON_GetNumberValue(fee_reserve);
+        }
+
+        cJSON* preimage = cJSON_GetObjectItem(json, "payment_preimage");
+        if (preimage && cJSON_IsString(preimage)) {
+            melt_quote_out->payment_preimage = cashu_strdup(cJSON_GetStringValue(preimage));
+        }
+    }
+
+    return NOSTR_SUCCESS;
+}
+
+static int cashu_call_raw(const char* mint_url,
+                          const char* endpoint,
+                          const char* method,
+                          const char* body,
+                          cJSON** response_out,
+                          int timeout_seconds) {
+    if (!mint_url || !endpoint || !method || !response_out) {
+        return NOSTR_ERROR_INVALID_INPUT;
+    }
+
+    *response_out = NULL;
+
+    char url[1024];
+    snprintf(url, sizeof(url), "%s%s", mint_url, endpoint);
+
+    char* response = NULL;
+    long status = 0;
+    int rc = cashu_http_json_request(method, url, body, timeout_seconds, &response, &status);
+    if (rc != NOSTR_SUCCESS) return rc;
+
+    cJSON* json = cJSON_Parse(response ? response : "{}");
+    free(response);
+
+    if (!json) return NOSTR_ERROR_CASHU_JSON_PARSE_FAILED;
+
+    if (status < 200 || status >= 300) {
+        cJSON_Delete(json);
+        return NOSTR_ERROR_CASHU_MINT_ERROR;
+    }
+
+    *response_out = json;
+    return NOSTR_SUCCESS;
+}
+
+int cashu_mint_get_info(const char* mint_url,
+                        cashu_mint_info_t* info_out,
+                        int timeout_seconds) {
+    if (!mint_url || !info_out) return NOSTR_ERROR_INVALID_INPUT;
+
+    memset(info_out, 0, sizeof(*info_out));
+
+    cJSON* json = NULL;
+    int rc = cashu_call_raw(mint_url, "/v1/info", "GET", NULL, &json, timeout_seconds);
+    if (rc != NOSTR_SUCCESS) return rc;
+
+    cJSON* name = cJSON_GetObjectItem(json, "name");
+    cJSON* pubkey = cJSON_GetObjectItem(json, "pubkey");
+    cJSON* version = cJSON_GetObjectItem(json, "version");
+
+    if (name && cJSON_IsString(name)) info_out->name = cashu_strdup(cJSON_GetStringValue(name));
+    if (pubkey && cJSON_IsString(pubkey)) info_out->pubkey = cashu_strdup(cJSON_GetStringValue(pubkey));
+    if (version && cJSON_IsString(version)) info_out->version = cashu_strdup(cJSON_GetStringValue(version));
+
+    cJSON* keysets = cJSON_GetObjectItem(json, "keysets");
+    if (keysets && cJSON_IsArray(keysets)) {
+        int n = cJSON_GetArraySize(keysets);
+        if (n > 0) {
+            info_out->keysets = (cashu_keyset_t*)calloc((size_t)n, sizeof(cashu_keyset_t));
+            if (!info_out->keysets) {
+                cJSON_Delete(json);
+                cashu_mint_free_info(info_out);
+                return NOSTR_ERROR_MEMORY_FAILED;
+            }
+
+            for (int i = 0; i < n; i++) {
+                cJSON* ks = cJSON_GetArrayItem(keysets, i);
+                if (!ks || !cJSON_IsObject(ks)) continue;
+
+                cJSON* id = cJSON_GetObjectItem(ks, "id");
+                cJSON* unit = cJSON_GetObjectItem(ks, "unit");
+                cJSON* active = cJSON_GetObjectItem(ks, "active");
+
+                if (id && cJSON_IsString(id)) {
+                    strncpy(info_out->keysets[info_out->keyset_count].id,
+                            cJSON_GetStringValue(id), sizeof(info_out->keysets[info_out->keyset_count].id) - 1);
+                }
+                if (unit && cJSON_IsString(unit)) {
+                    strncpy(info_out->keysets[info_out->keyset_count].unit,
+                            cJSON_GetStringValue(unit), sizeof(info_out->keysets[info_out->keyset_count].unit) - 1);
+                }
+                if (active && cJSON_IsBool(active)) {
+                    info_out->keysets[info_out->keyset_count].active = cJSON_IsTrue(active) ? 1 : 0;
+                }
+                info_out->keyset_count++;
+            }
+        }
+    }
+
+    cJSON_Delete(json);
+    return NOSTR_SUCCESS;
+}
+
+void cashu_mint_free_info(cashu_mint_info_t* info) {
+    if (!info) return;
+    free(info->name);
+    free(info->pubkey);
+    free(info->version);
+    free(info->keysets);
+    memset(info, 0, sizeof(*info));
+}
+
+int cashu_mint_request_mint_quote(const char* mint_url,
+                                  uint64_t amount,
+                                  const char* unit,
+                                  cashu_mint_quote_t* quote_out,
+                                  int timeout_seconds) {
+    if (!mint_url || !unit || !quote_out) return NOSTR_ERROR_INVALID_INPUT;
+
+    cJSON* req = cJSON_CreateObject();
+    cJSON_AddNumberToObject(req, "amount", (double)amount);
+    cJSON_AddStringToObject(req, "unit", unit);
+    char* body = cJSON_PrintUnformatted(req);
+    cJSON_Delete(req);
+    if (!body) return NOSTR_ERROR_MEMORY_FAILED;
+
+    cJSON* json = NULL;
+    int rc = cashu_call_raw(mint_url, "/v1/mint/quote/bolt11", "POST", body, &json, timeout_seconds);
+    free(body);
+    if (rc != NOSTR_SUCCESS) return rc;
+
+    rc = cashu_parse_quote_common(json, quote_out, NULL);
+    cJSON_Delete(json);
+    return rc;
+}
+
+int cashu_mint_check_mint_quote(const char* mint_url,
+                                const char* quote_id,
+                                cashu_mint_quote_t* quote_out,
+                                int timeout_seconds) {
+    if (!mint_url || !quote_id || !quote_out) return NOSTR_ERROR_INVALID_INPUT;
+
+    char endpoint[512];
+    snprintf(endpoint, sizeof(endpoint), "/v1/mint/quote/bolt11/%s", quote_id);
+
+    cJSON* json = NULL;
+    int rc = cashu_call_raw(mint_url, endpoint, "GET", NULL, &json, timeout_seconds);
+    if (rc != NOSTR_SUCCESS) return rc;
+
+    rc = cashu_parse_quote_common(json, quote_out, NULL);
+    cJSON_Delete(json);
+    return rc;
+}
+
+int cashu_mint_request_melt_quote(const char* mint_url,
+                                  const char* payment_request,
+                                  const char* unit,
+                                  cashu_melt_quote_t* quote_out,
+                                  int timeout_seconds) {
+    if (!mint_url || !payment_request || !unit || !quote_out) return NOSTR_ERROR_INVALID_INPUT;
+
+    cJSON* req = cJSON_CreateObject();
+    cJSON_AddStringToObject(req, "request", payment_request);
+    cJSON_AddStringToObject(req, "unit", unit);
+    char* body = cJSON_PrintUnformatted(req);
+    cJSON_Delete(req);
+    if (!body) return NOSTR_ERROR_MEMORY_FAILED;
+
+    cJSON* json = NULL;
+    int rc = cashu_call_raw(mint_url, "/v1/melt/quote/bolt11", "POST", body, &json, timeout_seconds);
+    free(body);
+    if (rc != NOSTR_SUCCESS) return rc;
+
+    rc = cashu_parse_quote_common(json, NULL, quote_out);
+    cJSON_Delete(json);
+    return rc;
+}
+
+int cashu_mint_check_melt_quote(const char* mint_url,
+                                const char* quote_id,
+                                cashu_melt_quote_t* quote_out,
+                                int timeout_seconds) {
+    if (!mint_url || !quote_id || !quote_out) return NOSTR_ERROR_INVALID_INPUT;
+
+    char endpoint[512];
+    snprintf(endpoint, sizeof(endpoint), "/v1/melt/quote/bolt11/%s", quote_id);
+
+    cJSON* json = NULL;
+    int rc = cashu_call_raw(mint_url, endpoint, "GET", NULL, &json, timeout_seconds);
+    if (rc != NOSTR_SUCCESS) return rc;
+
+    rc = cashu_parse_quote_common(json, NULL, quote_out);
+    cJSON_Delete(json);
+    return rc;
+}
+
+int cashu_mint_swap(const char* mint_url,
+                    cJSON* request_body,
+                    cJSON** response_out,
+                    int timeout_seconds) {
+    if (!request_body) return NOSTR_ERROR_INVALID_INPUT;
+    char* body = cJSON_PrintUnformatted(request_body);
+    if (!body) return NOSTR_ERROR_MEMORY_FAILED;
+    int rc = cashu_call_raw(mint_url, "/v1/swap", "POST", body, response_out, timeout_seconds);
+    free(body);
+    return rc;
+}
+
+int cashu_mint_mint_tokens(const char* mint_url,
+                           cJSON* request_body,
+                           cJSON** response_out,
+                           int timeout_seconds) {
+    if (!request_body) return NOSTR_ERROR_INVALID_INPUT;
+    char* body = cJSON_PrintUnformatted(request_body);
+    if (!body) return NOSTR_ERROR_MEMORY_FAILED;
+    int rc = cashu_call_raw(mint_url, "/v1/mint/bolt11", "POST", body, response_out, timeout_seconds);
+    free(body);
+    return rc;
+}
+
+int cashu_mint_melt_tokens(const char* mint_url,
+                           cJSON* request_body,
+                           cJSON** response_out,
+                           int timeout_seconds) {
+    if (!request_body) return NOSTR_ERROR_INVALID_INPUT;
+    char* body = cJSON_PrintUnformatted(request_body);
+    if (!body) return NOSTR_ERROR_MEMORY_FAILED;
+    int rc = cashu_call_raw(mint_url, "/v1/melt/bolt11", "POST", body, response_out, timeout_seconds);
+    free(body);
+    return rc;
+}
+
+int cashu_mint_check_proofs_state(const char* mint_url,
+                                  cJSON* request_body,
+                                  cJSON** response_out,
+                                  int timeout_seconds) {
+    if (!request_body) return NOSTR_ERROR_INVALID_INPUT;
+    char* body = cJSON_PrintUnformatted(request_body);
+    if (!body) return NOSTR_ERROR_MEMORY_FAILED;
+    int rc = cashu_call_raw(mint_url, "/v1/checkstate", "POST", body, response_out, timeout_seconds);
+    free(body);
+    return rc;
+}
@@ -0,0 +1,102 @@
+/*
+ * Cashu Mint HTTP Client
+ */
+
+#ifndef NOSTR_CASHU_MINT_H
+#define NOSTR_CASHU_MINT_H
+
+#include <stdint.h>
+#include <time.h>
+#include "nostr_common.h"
+#include "nip060.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#define CASHU_API_VERSION "v1"
+
+typedef struct {
+    char id[17];
+    char unit[16];
+    int active;
+} cashu_keyset_t;
+
+typedef struct {
+    char* name;
+    char* pubkey;
+    char* version;
+    cashu_keyset_t* keysets;
+    int keyset_count;
+} cashu_mint_info_t;
+
+typedef struct {
+    char quote_id[128];
+    char payment_request[2048];
+    int paid;
+    uint64_t amount;
+    time_t expiry;
+} cashu_mint_quote_t;
+
+typedef struct {
+    char quote_id[128];
+    uint64_t amount;
+    uint64_t fee_reserve;
+    int paid;
+    char* payment_preimage;
+    time_t expiry;
+} cashu_melt_quote_t;
+
+int cashu_mint_get_info(const char* mint_url,
+                        cashu_mint_info_t* info_out,
+                        int timeout_seconds);
+
+void cashu_mint_free_info(cashu_mint_info_t* info);
+
+int cashu_mint_request_mint_quote(const char* mint_url,
+                                  uint64_t amount,
+                                  const char* unit,
+                                  cashu_mint_quote_t* quote_out,
+                                  int timeout_seconds);
+
+int cashu_mint_check_mint_quote(const char* mint_url,
+                                const char* quote_id,
+                                cashu_mint_quote_t* quote_out,
+                                int timeout_seconds);
+
+int cashu_mint_request_melt_quote(const char* mint_url,
+                                  const char* payment_request,
+                                  const char* unit,
+                                  cashu_melt_quote_t* quote_out,
+                                  int timeout_seconds);
+
+int cashu_mint_check_melt_quote(const char* mint_url,
+                                const char* quote_id,
+                                cashu_melt_quote_t* quote_out,
+                                int timeout_seconds);
+
+int cashu_mint_swap(const char* mint_url,
+                    cJSON* request_body,
+                    cJSON** response_out,
+                    int timeout_seconds);
+
+int cashu_mint_mint_tokens(const char* mint_url,
+                           cJSON* request_body,
+                           cJSON** response_out,
+                           int timeout_seconds);
+
+int cashu_mint_melt_tokens(const char* mint_url,
+                           cJSON* request_body,
+                           cJSON** response_out,
+                           int timeout_seconds);
+
+int cashu_mint_check_proofs_state(const char* mint_url,
+                                  cJSON* request_body,
+                                  cJSON** response_out,
+                                  int timeout_seconds);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* NOSTR_CASHU_MINT_H */
@@ -1,824 +0,0 @@
-/*
- * NOSTR Core Library Implementation - Core Functionality
- * 
- * Self-contained crypto implementation (no external crypto dependencies)
- * 
- * This file contains:
- * - NIP-19: Bech32-encoded Entities
- * - NIP-01: Basic Protocol Flow
- * - NIP-06: Key Derivation from Mnemonic
- * - NIP-10: Text Notes (Kind 1)
- * - NIP-13: Proof of Work
- * - General Utilities
- * - Identity Management
- * - Single Relay Communication
- */
-
-#define _GNU_SOURCE
-#define _POSIX_C_SOURCE 200809L
-
-#include "nostr_core.h"
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-#include <time.h>
-#include <sys/stat.h>
-#include <unistd.h>
-#include <ctype.h>
-
-// Our self-contained crypto implementation
-#include "nostr_crypto.h"
-
-// Our production-ready WebSocket implementation
-#include "../nostr_websocket/nostr_websocket_tls.h"
-
-// cJSON for JSON handling
-#include "../cjson/cJSON.h"
-
-
-// Forward declarations for bech32 functions (used by NIP-06 functions)
-static int convert_bits(uint8_t *out, size_t *outlen, int outbits, const uint8_t *in, size_t inlen, int inbits, int pad);
-static int bech32_encode(char *output, const char *hrp, const uint8_t *data, size_t data_len);
-static int bech32_decode(const char* input, const char* hrp, unsigned char* data, size_t* data_len);
-
-
-////////////////////////////////////////////////////////////////////////////////
-////////////////////////////////////////////////////////////////////////////////
-//                GENERAL UTILITIES
-////////////////////////////////////////////////////////////////////////////////
-////////////////////////////////////////////////////////////////////////////////
-
-void nostr_bytes_to_hex(const unsigned char* bytes, size_t len, char* hex) {
-    for (size_t i = 0; i < len; i++) {
-        sprintf(hex + i * 2, "%02x", bytes[i]);
-    }
-    hex[len * 2] = '\0';
-}
-
-int nostr_hex_to_bytes(const char* hex, unsigned char* bytes, size_t len) {
-    if (strlen(hex) != len * 2) {
-        return NOSTR_ERROR_INVALID_INPUT;
-    }
-    
-    for (size_t i = 0; i < len; i++) {
-        if (sscanf(hex + i * 2, "%02hhx", &bytes[i]) != 1) {
-            return NOSTR_ERROR_INVALID_INPUT;
-        }
-    }
-    return NOSTR_SUCCESS;
-}
-
-
-
-////////////////////////////////////////////////////////////////////////////////
-////////////////////////////////////////////////////////////////////////////////
-//                NIP-01: BASIC PROTOCOL FLOW
-////////////////////////////////////////////////////////////////////////////////
-////////////////////////////////////////////////////////////////////////////////
-
-int nostr_init(void) {
-    if (nostr_crypto_init() != 0) {
-        return NOSTR_ERROR_CRYPTO_FAILED;
-    }
-    return NOSTR_SUCCESS;
-}
-
-void nostr_cleanup(void) {
-    nostr_crypto_cleanup();
-}
-
-const char* nostr_strerror(int error_code) {
-    switch (error_code) {
-        case NOSTR_SUCCESS: return "Success";
-        case NOSTR_ERROR_INVALID_INPUT: return "Invalid input";
-        case NOSTR_ERROR_CRYPTO_FAILED: return "Cryptographic operation failed";
-        case NOSTR_ERROR_MEMORY_FAILED: return "Memory allocation failed";
-        case NOSTR_ERROR_IO_FAILED: return "I/O operation failed";
-        case NOSTR_ERROR_NETWORK_FAILED: return "Network operation failed";
-        case NOSTR_ERROR_NIP04_INVALID_FORMAT: return "NIP-04 invalid format";
-        case NOSTR_ERROR_NIP04_DECRYPT_FAILED: return "NIP-04 decryption failed";
-        case NOSTR_ERROR_NIP04_BUFFER_TOO_SMALL: return "NIP-04 buffer too small";
-        default: return "Unknown error";
-    }
-}
-
-cJSON* nostr_create_and_sign_event(int kind, const char* content, cJSON* tags, const unsigned char* private_key, time_t timestamp) {
-    if (!private_key) {
-        return NULL;
-    }
-    
-    if (!content) {
-        content = ""; // Default to empty content
-    }
-    
-    // Convert private key to public key
-    unsigned char public_key[32];
-    if (nostr_ec_public_key_from_private_key(private_key, public_key) != 0) {
-        return NULL;
-    }
-    
-    // Convert public key to hex
-    char pubkey_hex[65];
-    nostr_bytes_to_hex(public_key, 32, pubkey_hex);
-    
-    // Create event structure
-    cJSON* event = cJSON_CreateObject();
-    if (!event) {
-        return NULL;
-    }
-    
-    // Use provided timestamp or current time if timestamp is 0
-    time_t event_time = (timestamp == 0) ? time(NULL) : timestamp;
-    
-    cJSON_AddStringToObject(event, "pubkey", pubkey_hex);
-    cJSON_AddNumberToObject(event, "created_at", (double)event_time);
-    cJSON_AddNumberToObject(event, "kind", kind);
-    
-    // Add tags (copy provided tags or create empty array)
-    if (tags) {
-        cJSON_AddItemToObject(event, "tags", cJSON_Duplicate(tags, 1));
-    } else {
-        cJSON_AddItemToObject(event, "tags", cJSON_CreateArray());
-    }
-    
-    cJSON_AddStringToObject(event, "content", content);
-    
-    // ============================================================================
-    // INLINE SERIALIZATION AND SIGNING LOGIC 
-    // ============================================================================
-    
-    // Get event fields for serialization
-    cJSON* pubkey_item = cJSON_GetObjectItem(event, "pubkey");
-    cJSON* created_at_item = cJSON_GetObjectItem(event, "created_at");
-    cJSON* kind_item = cJSON_GetObjectItem(event, "kind");
-    cJSON* tags_item = cJSON_GetObjectItem(event, "tags");
-    cJSON* content_item = cJSON_GetObjectItem(event, "content");
-    
-    if (!pubkey_item || !created_at_item || !kind_item || !tags_item || !content_item) {
-        cJSON_Delete(event);
-        return NULL;
-    }
-    
-    // Create serialization array: [0, pubkey, created_at, kind, tags, content]
-    cJSON* serialize_array = cJSON_CreateArray();
-    if (!serialize_array) {
-        cJSON_Delete(event);
-        return NULL;
-    }
-    
-    cJSON_AddItemToArray(serialize_array, cJSON_CreateNumber(0));
-    cJSON_AddItemToArray(serialize_array, cJSON_Duplicate(pubkey_item, 1));
-    cJSON_AddItemToArray(serialize_array, cJSON_Duplicate(created_at_item, 1));
-    cJSON_AddItemToArray(serialize_array, cJSON_Duplicate(kind_item, 1));
-    cJSON_AddItemToArray(serialize_array, cJSON_Duplicate(tags_item, 1));
-    cJSON_AddItemToArray(serialize_array, cJSON_Duplicate(content_item, 1));
-    
-    char* serialize_string = cJSON_PrintUnformatted(serialize_array);
-    cJSON_Delete(serialize_array);
-    
-    if (!serialize_string) {
-        cJSON_Delete(event);
-        return NULL;
-    }
-    
-    // Hash the serialized event
-    unsigned char event_hash[32];
-    if (nostr_sha256((const unsigned char*)serialize_string, strlen(serialize_string), event_hash) != 0) {
-        free(serialize_string);
-        cJSON_Delete(event);
-        return NULL;
-    }
-    
-    // Convert hash to hex for event ID
-    char event_id[65];
-    nostr_bytes_to_hex(event_hash, 32, event_id);
-    
-    // Sign the hash using ECDSA
-    unsigned char signature[64];
-    if (nostr_ec_sign(private_key, event_hash, signature) != 0) {
-        free(serialize_string);
-        cJSON_Delete(event);
-        return NULL;
-    }
-    
-    // Convert signature to hex
-    char sig_hex[129];
-    nostr_bytes_to_hex(signature, 64, sig_hex);
-    
-    // Add ID and signature to the event
-    cJSON_AddStringToObject(event, "id", event_id);
-    cJSON_AddStringToObject(event, "sig", sig_hex);
-    
-    free(serialize_string);
-    
-    return event;
-}
-
-
-
-////////////////////////////////////////////////////////////////////////////////
-////////////////////////////////////////////////////////////////////////////////
-//                NIP-06: KEY DERIVATION FROM MNEMONIC
-////////////////////////////////////////////////////////////////////////////////
-////////////////////////////////////////////////////////////////////////////////
-
-int nostr_generate_keypair(unsigned char* private_key, unsigned char* public_key) {
-    if (!private_key || !public_key) {
-        return NOSTR_ERROR_INVALID_INPUT;
-    }
-    
-    // Generate random entropy using /dev/urandom
-    FILE* urandom = fopen("/dev/urandom", "rb");
-    if (!urandom) {
-        return NOSTR_ERROR_IO_FAILED;
-    }
-    
-    if (fread(private_key, 1, 32, urandom) != 32) {
-        fclose(urandom);
-        return NOSTR_ERROR_IO_FAILED;
-    }
-    fclose(urandom);
-    
-    // Validate private key
-    if (nostr_ec_private_key_verify(private_key) != 0) {
-        return NOSTR_ERROR_CRYPTO_FAILED;
-    }
-    
-    // Generate public key from private key (already x-only for NOSTR)
-    if (nostr_ec_public_key_from_private_key(private_key, public_key) != 0) {
-        return NOSTR_ERROR_CRYPTO_FAILED;
-    }
-    
-    return NOSTR_SUCCESS;
-}
-
-int nostr_generate_mnemonic_and_keys(char* mnemonic, size_t mnemonic_size, 
-                                    int account, unsigned char* private_key, 
-                                    unsigned char* public_key) {
-    if (!mnemonic || mnemonic_size < 256 || !private_key || !public_key) {
-        return NOSTR_ERROR_INVALID_INPUT;
-    }
-    
-    // Generate entropy for 12-word mnemonic
-    unsigned char entropy[16];
-    FILE* urandom = fopen("/dev/urandom", "rb");
-    if (!urandom) {
-        return NOSTR_ERROR_IO_FAILED;
-    }
-    
-    if (fread(entropy, 1, sizeof(entropy), urandom) != sizeof(entropy)) {
-        fclose(urandom);
-        return NOSTR_ERROR_IO_FAILED;
-    }
-    fclose(urandom);
-    
-    // Generate mnemonic from entropy
-    if (nostr_bip39_mnemonic_from_bytes(entropy, sizeof(entropy), mnemonic) != 0) {
-        return NOSTR_ERROR_CRYPTO_FAILED;
-    }
-    
-    // Derive keys from the generated mnemonic
-    return nostr_derive_keys_from_mnemonic(mnemonic, account, private_key, public_key);
-}
-
-int nostr_derive_keys_from_mnemonic(const char* mnemonic, int account,
-                                   unsigned char* private_key, unsigned char* public_key) {
-    if (!mnemonic || !private_key || !public_key) {
-        return NOSTR_ERROR_INVALID_INPUT;
-    }
-    
-    // Validate mnemonic
-    if (nostr_bip39_mnemonic_validate(mnemonic) != 0) {
-        return NOSTR_ERROR_INVALID_INPUT;
-    }
-    
-    // Convert mnemonic to seed
-    unsigned char seed[64];
-    if (nostr_bip39_mnemonic_to_seed(mnemonic, "", seed, sizeof(seed)) != 0) {
-        return NOSTR_ERROR_CRYPTO_FAILED;
-    }
-    
-    // Derive master key from seed
-    nostr_hd_key_t master_key;
-    if (nostr_bip32_key_from_seed(seed, sizeof(seed), &master_key) != 0) {
-        return NOSTR_ERROR_CRYPTO_FAILED;
-    }
-    
-    // NIP-06 path: m/44'/1237'/account'/0/0
-    nostr_hd_key_t derived_key;
-    uint32_t path[] = {
-        0x80000000 + 44,    // 44' (hardened)
-        0x80000000 + 1237,  // 1237' (hardened)
-        0x80000000 + account, // account' (hardened)
-        0,                   // 0 (not hardened)
-        0                    // 0 (not hardened)
-    };
-    
-    if (nostr_bip32_derive_path(&master_key, path, sizeof(path) / sizeof(path[0]), &derived_key) != 0) {
-        return NOSTR_ERROR_CRYPTO_FAILED;
-    }
-    
-    // Extract private key and public key
-    memcpy(private_key, derived_key.private_key, 32);
-    memcpy(public_key, derived_key.public_key + 1, 32); // Remove compression prefix for x-only
-    
-    return NOSTR_SUCCESS;
-}
-
-int nostr_key_to_bech32(const unsigned char* key, const char* hrp, char* output) {
-    if (!key || !hrp || !output) {
-        return NOSTR_ERROR_INVALID_INPUT;
-    }
-    
-    uint8_t conv[64];
-    size_t conv_len;
-    
-    if (!convert_bits(conv, &conv_len, 5, key, 32, 8, 1)) {
-        return NOSTR_ERROR_CRYPTO_FAILED;
-    }
-    
-    if (!bech32_encode(output, hrp, conv, conv_len)) {
-        return NOSTR_ERROR_CRYPTO_FAILED;
-    }
-    
-    return NOSTR_SUCCESS;
-}
-
-nostr_input_type_t nostr_detect_input_type(const char* input) {
-    if (!input || strlen(input) == 0) {
-        return NOSTR_INPUT_UNKNOWN;
-    }
-    
-    size_t len = strlen(input);
-    
-    // Check for bech32 nsec
-    if (len > 5 && strncmp(input, "nsec1", 5) == 0) {
-        return NOSTR_INPUT_NSEC_BECH32;
-    }
-    
-    // Check for hex nsec (64 characters, all hex)
-    if (len == 64) {
-        int is_hex = 1;
-        for (size_t i = 0; i < len; i++) {
-            if (!isxdigit(input[i])) {
-                is_hex = 0;
-                break;
-            }
-        }
-        if (is_hex) {
-            return NOSTR_INPUT_NSEC_HEX;
-        }
-    }
-    
-    // Check for mnemonic (space-separated words)
-    int word_count = 0;
-    char temp[1024];
-    strncpy(temp, input, sizeof(temp) - 1);
-    temp[sizeof(temp) - 1] = '\0';
-    
-    char* token = strtok(temp, " ");
-    while (token != NULL) {
-        word_count++;
-        token = strtok(NULL, " ");
-    }
-    
-    // BIP39 mnemonics are typically 12, 18, or 24 words
-    if (word_count >= 12 && word_count <= 24) {
-        return NOSTR_INPUT_MNEMONIC;
-    }
-    
-    return NOSTR_INPUT_UNKNOWN;
-}
-
-int nostr_decode_nsec(const char* input, unsigned char* private_key) {
-    if (!input || !private_key) {
-        return NOSTR_ERROR_INVALID_INPUT;
-    }
-    
-    nostr_input_type_t type = nostr_detect_input_type(input);
-    
-    if (type == NOSTR_INPUT_NSEC_HEX) {
-        if (nostr_hex_to_bytes(input, private_key, 32) != NOSTR_SUCCESS) {
-            return NOSTR_ERROR_INVALID_INPUT;
-        }
-    } else if (type == NOSTR_INPUT_NSEC_BECH32) {
-        size_t decoded_len;
-        if (!bech32_decode(input, "nsec", private_key, &decoded_len)) {
-            return NOSTR_ERROR_INVALID_INPUT;
-        }
-        if (decoded_len != 32) {
-            return NOSTR_ERROR_INVALID_INPUT;
-        }
-    } else {
-        return NOSTR_ERROR_INVALID_INPUT;
-    }
-    
-    // Validate the private key
-    if (nostr_ec_private_key_verify(private_key) != 0) {
-        return NOSTR_ERROR_CRYPTO_FAILED;
-    }
-    
-    return NOSTR_SUCCESS;
-}
-
-
-
-////////////////////////////////////////////////////////////////////////////////
-////////////////////////////////////////////////////////////////////////////////
-//                NIP-13: PROOF OF WORK
-////////////////////////////////////////////////////////////////////////////////
-////////////////////////////////////////////////////////////////////////////////
-
-/**
- * Count leading zero bits in a hash (NIP-13 reference implementation)
- */
-static int zero_bits(unsigned char b) {
-    int n = 0;
-    
-    if (b == 0)
-        return 8;
-    
-    while (b >>= 1)
-        n++;
-    
-    return 7-n;
-}
-
-/**
- * Find the number of leading zero bits in a hash (NIP-13 reference implementation)
- */
-static int count_leading_zero_bits(unsigned char *hash) {
-    int bits, total, i;
-    for (i = 0, total = 0; i < 32; i++) {
-        bits = zero_bits(hash[i]);
-        total += bits;
-        if (bits != 8)
-            break;
-    }
-    return total;
-}
-
-
-/**
- * Add or update nonce tag with target difficulty
- */
-static int update_nonce_tag_with_difficulty(cJSON* tags, uint64_t nonce, int target_difficulty) {
-    if (!tags) return -1;
-    
-    // Look for existing nonce tag and remove it
-    cJSON* tag = NULL;
-    int index = 0;
-    cJSON_ArrayForEach(tag, tags) {
-        if (cJSON_IsArray(tag) && cJSON_GetArraySize(tag) >= 2) {
-            cJSON* tag_type = cJSON_GetArrayItem(tag, 0);
-            if (tag_type && cJSON_IsString(tag_type) && 
-                strcmp(cJSON_GetStringValue(tag_type), "nonce") == 0) {
-                // Remove existing nonce tag
-                cJSON_DetachItemFromArray(tags, index);
-                cJSON_Delete(tag);
-                break;
-            }
-        }
-        index++;
-    }
-    
-    // Add new nonce tag with format: ["nonce", "<nonce>", "<target_difficulty>"]
-    cJSON* nonce_tag = cJSON_CreateArray();
-    if (!nonce_tag) return -1;
-    
-    char nonce_str[32];
-    char difficulty_str[16];
-    snprintf(nonce_str, sizeof(nonce_str), "%llu", (unsigned long long)nonce);
-    snprintf(difficulty_str, sizeof(difficulty_str), "%d", target_difficulty);
-    
-    cJSON_AddItemToArray(nonce_tag, cJSON_CreateString("nonce"));
-    cJSON_AddItemToArray(nonce_tag, cJSON_CreateString(nonce_str));
-    cJSON_AddItemToArray(nonce_tag, cJSON_CreateString(difficulty_str));
-    
-    cJSON_AddItemToArray(tags, nonce_tag);
-    return 0;
-}
-
-/**
- * Helper function to replace event content with successful PoW result
- */
-static void replace_event_content(cJSON* target_event, cJSON* source_event) {
-    // Remove old fields
-    cJSON_DeleteItemFromObject(target_event, "id");
-    cJSON_DeleteItemFromObject(target_event, "sig");
-    cJSON_DeleteItemFromObject(target_event, "tags");
-    cJSON_DeleteItemFromObject(target_event, "created_at");
-    
-    // Copy new fields from successful event
-    cJSON* id = cJSON_GetObjectItem(source_event, "id");
-    cJSON* sig = cJSON_GetObjectItem(source_event, "sig");
-    cJSON* tags = cJSON_GetObjectItem(source_event, "tags");
-    cJSON* created_at = cJSON_GetObjectItem(source_event, "created_at");
-    
-    if (id) cJSON_AddItemToObject(target_event, "id", cJSON_Duplicate(id, 1));
-    if (sig) cJSON_AddItemToObject(target_event, "sig", cJSON_Duplicate(sig, 1));
-    if (tags) cJSON_AddItemToObject(target_event, "tags", cJSON_Duplicate(tags, 1));
-    if (created_at) cJSON_AddItemToObject(target_event, "created_at", cJSON_Duplicate(created_at, 1));
-}
-
-/**
- * Add NIP-13 Proof of Work to an event
- * 
- * @param event The event to add proof of work to
- * @param private_key The private key for re-signing the event
- * @param target_difficulty Target number of leading zero bits (default: 4 if 0)
- * @param progress_callback Optional callback for mining progress
- * @param user_data User data for progress callback
- * @return NOSTR_SUCCESS on success, error code on failure
- */
-int nostr_add_proof_of_work(cJSON* event, const unsigned char* private_key, 
-                           int target_difficulty,
-                           void (*progress_callback)(int current_difficulty, uint64_t nonce, void* user_data),
-                           void* user_data) {
-    if (!event || !private_key) {
-        return NOSTR_ERROR_INVALID_INPUT;
-    }
-    
-    // Set default difficulty if not specified (but allow 0 to disable PoW)
-    if (target_difficulty < 0) {
-        target_difficulty = 4;
-    }
-    
-    // If target_difficulty is 0, skip proof of work entirely
-    if (target_difficulty == 0) {
-        return NOSTR_SUCCESS;
-    }
-    
-    // Extract event data for reconstruction
-    cJSON* kind_item = cJSON_GetObjectItem(event, "kind");
-    cJSON* content_item = cJSON_GetObjectItem(event, "content");
-    cJSON* created_at_item = cJSON_GetObjectItem(event, "created_at");
-    cJSON* tags_item = cJSON_GetObjectItem(event, "tags");
-    
-    if (!kind_item || !content_item || !created_at_item || !tags_item) {
-        return NOSTR_ERROR_INVALID_INPUT;
-    }
-    
-    int kind = (int)cJSON_GetNumberValue(kind_item);
-    const char* content = cJSON_GetStringValue(content_item);
-    time_t original_timestamp = (time_t)cJSON_GetNumberValue(created_at_item);
-    
-    uint64_t nonce = 0;
-    int attempts = 0;
-    int max_attempts = 10000000;
-    time_t current_timestamp = original_timestamp;
-    
-    // PoW difficulty tracking variables
-    int best_difficulty_this_round = 0;
-    int best_difficulty_overall = 0;
-    
-    // Mining loop
-    while (attempts < max_attempts) {
-        // Update timestamp every 10,000 iterations
-        if (attempts % 10000 == 0) {
-            current_timestamp = time(NULL);
-#ifdef ENABLE_DEBUG_LOGGING
-            FILE* f = fopen("debug.log", "a"); 
-            if (f) { 
-                fprintf(f, "PoW mining: %d attempts, best this round: %d, overall best: %d, goal: %d\n", 
-                        attempts, best_difficulty_this_round, best_difficulty_overall, target_difficulty); 
-                fclose(f); 
-            }
-#endif
-            // Reset best difficulty for the new round
-            best_difficulty_this_round = 0;
-        }
-        
-        // Create working copy of tags and add nonce
-        cJSON* working_tags = cJSON_Duplicate(tags_item, 1);
-        if (!working_tags) {
-            return NOSTR_ERROR_MEMORY_FAILED;
-        }
-        
-        if (update_nonce_tag_with_difficulty(working_tags, nonce, target_difficulty) != 0) {
-            cJSON_Delete(working_tags);
-            return NOSTR_ERROR_CRYPTO_FAILED;
-        }
-        
-        // Create and sign new event with current nonce
-        cJSON* test_event = nostr_create_and_sign_event(kind, content, working_tags, 
-                                                       private_key, current_timestamp);
-        cJSON_Delete(working_tags);
-        
-        if (!test_event) {
-            return NOSTR_ERROR_CRYPTO_FAILED;
-        }
-        
-        // Check PoW difficulty
-        cJSON* id_item = cJSON_GetObjectItem(test_event, "id");
-        if (!id_item || !cJSON_IsString(id_item)) {
-            cJSON_Delete(test_event);
-            return NOSTR_ERROR_CRYPTO_FAILED;
-        }
-        
-        const char* event_id = cJSON_GetStringValue(id_item);
-        unsigned char hash[32];
-        if (nostr_hex_to_bytes(event_id, hash, 32) != NOSTR_SUCCESS) {
-            cJSON_Delete(test_event);
-            return NOSTR_ERROR_CRYPTO_FAILED;
-        }
-        
-        // Count leading zero bits using NIP-13 method
-        int current_difficulty = count_leading_zero_bits(hash);
-        
-        // Update difficulty tracking
-        if (current_difficulty > best_difficulty_this_round) {
-            best_difficulty_this_round = current_difficulty;
-        }
-        if (current_difficulty > best_difficulty_overall) {
-            best_difficulty_overall = current_difficulty;
-        }
-        
-        // Call progress callback if provided
-        if (progress_callback) {
-            progress_callback(current_difficulty, nonce, user_data);
-        }
-        
-        // Check if we've reached the target
-        if (current_difficulty >= target_difficulty) {
-#ifdef ENABLE_DEBUG_LOGGING
-            FILE* f = fopen("debug.log", "a"); 
-            if (f) { 
-                fprintf(f, "PoW SUCCESS: Found difficulty %d (target %d) at nonce %llu after %d attempts\n", 
-                        current_difficulty, target_difficulty, (unsigned long long)nonce, attempts + 1);
-                
-                // Print the final event JSON
-                char* event_json = cJSON_Print(test_event);
-                if (event_json) {
-                    fprintf(f, "Final event: %s\n", event_json);
-                    free(event_json);
-                }
-                fclose(f); 
-            }
-#endif
-            
-            // Copy successful result back to input event
-            replace_event_content(event, test_event);
-            cJSON_Delete(test_event);
-            return NOSTR_SUCCESS;
-        }
-        
-        cJSON_Delete(test_event);
-        nonce++;
-        attempts++;
-    }
-    
-#ifdef ENABLE_DEBUG_LOGGING
-    // Debug logging - failure
-    FILE* f = fopen("debug.log", "a"); 
-    if (f) { 
-        fprintf(f, "PoW FAILED: Mining failed after %d attempts\n", max_attempts); 
-        fclose(f); 
-    }
-#endif
-    
-    // If we reach here, we've exceeded max attempts
-    return NOSTR_ERROR_CRYPTO_FAILED;
-}
-
-
-////////////////////////////////////////////////////////////////////////////////
-////////////////////////////////////////////////////////////////////////////////
-//                NIP-19: BECH32-ENCODED ENTITIES
-////////////////////////////////////////////////////////////////////////////////
-////////////////////////////////////////////////////////////////////////////////
-
-#define BECH32_CONST 1
-
-static const char bech32_charset[] = "qpzry9x8gf2tvdw0s3jn54khce6mua7l";
-
-static const int8_t bech32_charset_rev[128] = {
-    -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-    -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-    -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-    15, -1, 10, 17, 21, 20, 26, 30,  7,  5, -1, -1, -1, -1, -1, -1,
-    -1, 29, -1, 24, 13, 25,  9,  8, 23, -1, 18, 22, 31, 27, 19, -1,
-    1,  0,  3, 16, 11, 28, 12, 14,  6,  4,  2, -1, -1, -1, -1, -1,
-    -1, 29, -1, 24, 13, 25,  9,  8, 23, -1, 18, 22, 31, 27, 19, -1,
-    1,  0,  3, 16, 11, 28, 12, 14,  6,  4,  2, -1, -1, -1, -1, -1
-};
-
-static uint32_t bech32_polymod_step(uint32_t pre) {
-    uint8_t b = pre >> 25;
-    return ((pre & 0x1FFFFFF) << 5) ^
-           (-((b >> 0) & 1) & 0x3b6a57b2UL) ^
-           (-((b >> 1) & 1) & 0x26508e6dUL) ^
-           (-((b >> 2) & 1) & 0x1ea119faUL) ^
-           (-((b >> 3) & 1) & 0x3d4233ddUL) ^
-           (-((b >> 4) & 1) & 0x2a1462b3UL);
-}
-
-static int convert_bits(uint8_t *out, size_t *outlen, int outbits, const uint8_t *in, size_t inlen, int inbits, int pad) {
-    uint32_t val = 0;
-    int bits = 0;
-    uint32_t maxv = (((uint32_t)1) << outbits) - 1;
-    *outlen = 0;
-    while (inlen--) {
-        val = (val << inbits) | *(in++);
-        bits += inbits;
-        while (bits >= outbits) {
-            bits -= outbits;
-            out[(*outlen)++] = (val >> bits) & maxv;
-        }
-    }
-    if (pad) {
-        if (bits) {
-            out[(*outlen)++] = (val << (outbits - bits)) & maxv;
-        }
-    } else if (((val << (outbits - bits)) & maxv) || bits >= inbits) {
-        return 0;
-    }
-    return 1;
-}
-
-static int bech32_encode(char *output, const char *hrp, const uint8_t *data, size_t data_len) {
-    uint32_t chk = 1;
-    size_t i, hrp_len = strlen(hrp);
-    
-    for (i = 0; i < hrp_len; ++i) {
-        int ch = hrp[i];
-        if (ch < 33 || ch > 126) return 0;
-        if (ch >= 'A' && ch <= 'Z') return 0;
-        chk = bech32_polymod_step(chk) ^ (ch >> 5);
-    }
-    
-    chk = bech32_polymod_step(chk);
-    for (i = 0; i < hrp_len; ++i) {
-        chk = bech32_polymod_step(chk) ^ (hrp[i] & 0x1f);
-        *(output++) = hrp[i];
-    }
-    
-    *(output++) = '1';
-    for (i = 0; i < data_len; ++i) {
-        if (*data >> 5) return 0;
-        chk = bech32_polymod_step(chk) ^ (*data);
-        *(output++) = bech32_charset[*(data++)];
-    }
-    
-    for (i = 0; i < 6; ++i) {
-        chk = bech32_polymod_step(chk);
-    }
-    
-    chk ^= BECH32_CONST;
-    for (i = 0; i < 6; ++i) {
-        *(output++) = bech32_charset[(chk >> ((5 - i) * 5)) & 0x1f];
-    }
-    
-    *output = 0;
-    return 1;
-}
-
-static int bech32_decode(const char* input, const char* hrp, unsigned char* data, size_t* data_len) {
-    if (!input || !hrp || !data || !data_len) {
-        return 0;
-    }
-    
-    size_t input_len = strlen(input);
-    size_t hrp_len = strlen(hrp);
-    
-    if (input_len < hrp_len + 7) return 0;
-    if (strncmp(input, hrp, hrp_len) != 0) return 0;
-    if (input[hrp_len] != '1') return 0;
-    
-    const char* data_part = input + hrp_len + 1;
-    size_t data_part_len = input_len - hrp_len - 1;
-    
-    uint8_t values[256];
-    for (size_t i = 0; i < data_part_len; i++) {
-        unsigned char c = (unsigned char)data_part[i];
-        if (c >= 128) return 0;
-        int8_t val = bech32_charset_rev[c];
-        if (val == -1) return 0;
-        values[i] = (uint8_t)val;
-    }
-    
-    if (data_part_len < 6) return 0;
-    
-    uint32_t chk = 1;
-    for (size_t i = 0; i < hrp_len; i++) {
-        chk = bech32_polymod_step(chk) ^ (hrp[i] >> 5);
-    }
-    chk = bech32_polymod_step(chk);
-    for (size_t i = 0; i < hrp_len; i++) {
-        chk = bech32_polymod_step(chk) ^ (hrp[i] & 0x1f);
-    }
-    for (size_t i = 0; i < data_part_len; i++) {
-        chk = bech32_polymod_step(chk) ^ values[i];
-    }
-    
-    if (chk != BECH32_CONST) return 0;
-    
-    size_t payload_len = data_part_len - 6;
-    size_t decoded_len;
-    if (!convert_bits(data, &decoded_len, 8, values, payload_len, 5, 0)) {
-        return 0;
-    }
-    
-    *data_len = decoded_len;
-    return 1;
-}
@@ -26,6 +26,9 @@
 // cJSON for JSON handling
 #include "../cjson/cJSON.h"

+// NIP-42 Authentication
+#include "nip042.h"
+
 // =============================================================================
 // TYPE DEFINITIONS FOR SYNCHRONOUS RELAY QUERIES
 // =============================================================================
@@ -51,6 +54,12 @@ typedef struct {
    cJSON** events;              // Array of events from this relay
    int events_capacity;         // Allocated capacity
    char subscription_id[32];    // Unique subscription ID
+
+    // NIP-42 Authentication fields
+    nostr_auth_state_t auth_state;           // Current authentication state
+    char auth_challenge[NOSTR_NIP42_MAX_CHALLENGE_LENGTH]; // Stored challenge
+    time_t auth_challenge_time;              // When challenge was received
+    int nip42_enabled;                       // Whether NIP-42 is enabled for this relay
 } relay_connection_t;


@@ -65,7 +74,9 @@ cJSON** synchronous_query_relays_with_progress(
    int* result_count,
    int relay_timeout_seconds,
    relay_progress_callback_t callback,
-    void* user_data) {
+    void* user_data,
+    int nip42_enabled,
+    const unsigned char* private_key) {
    
    if (!relay_urls || relay_count <= 0 || !filter || !result_count) {
        if (result_count) *result_count = 0;
@@ -95,11 +106,17 @@ cJSON** synchronous_query_relays_with_progress(
        relays[i].last_activity = start_time;
        relays[i].events_capacity = 10;
        relays[i].events = malloc(relays[i].events_capacity * sizeof(cJSON*));
-        
+
+        // Initialize NIP-42 authentication fields
+        relays[i].auth_state = NOSTR_AUTH_STATE_NONE;
+        memset(relays[i].auth_challenge, 0, sizeof(relays[i].auth_challenge));
+        relays[i].auth_challenge_time = 0;
+        relays[i].nip42_enabled = nip42_enabled;
+
        // Generate unique subscription ID
-        snprintf(relays[i].subscription_id, sizeof(relays[i].subscription_id), 
+        snprintf(relays[i].subscription_id, sizeof(relays[i].subscription_id),
                 "sync_%d_%ld", i, start_time);
-        
+
        if (callback) {
            callback(relays[i].url, "connecting", NULL, 0, relay_count, 0, user_data);
        }
@@ -191,19 +208,50 @@ cJSON** synchronous_query_relays_with_progress(
                cJSON* parsed = NULL;
                if (nostr_parse_relay_message(buffer, &msg_type, &parsed) == 0) {
                    
-                    if (msg_type && strcmp(msg_type, "EVENT") == 0) {
+                    if (msg_type && strcmp(msg_type, "AUTH") == 0) {
+                        // Handle AUTH challenge message: ["AUTH", <challenge-string>]
+                        if (relay->nip42_enabled && private_key && cJSON_IsArray(parsed) && cJSON_GetArraySize(parsed) >= 2) {
+                            cJSON* challenge_json = cJSON_GetArrayItem(parsed, 1);
+                            if (cJSON_IsString(challenge_json)) {
+                                const char* challenge = cJSON_GetStringValue(challenge_json);
+
+                                // Store challenge and attempt authentication
+                                strncpy(relay->auth_challenge, challenge, sizeof(relay->auth_challenge) - 1);
+                                relay->auth_challenge[sizeof(relay->auth_challenge) - 1] = '\0';
+                                relay->auth_challenge_time = time(NULL);
+                                relay->auth_state = NOSTR_AUTH_STATE_CHALLENGE_RECEIVED;
+
+                                // Create and send authentication event
+                                cJSON* auth_event = nostr_nip42_create_auth_event(challenge, relay->url, private_key, 0);
+                                if (auth_event) {
+                                    char* auth_message = nostr_nip42_create_auth_message(auth_event);
+                                    if (auth_message) {
+                                        if (nostr_ws_send_text(relay->client, auth_message) >= 0) {
+                                            relay->auth_state = NOSTR_AUTH_STATE_AUTHENTICATING;
+                                            if (callback) {
+                                                callback(relay->url, "authenticating", NULL, 0, relay_count, completed_relays, user_data);
+                                            }
+                                        }
+                                        free(auth_message);
+                                    }
+                                    cJSON_Delete(auth_event);
+                                }
+                            }
+                        }
+
+                    } else if (msg_type && strcmp(msg_type, "EVENT") == 0) {
                        // Handle EVENT message
                        if (cJSON_IsArray(parsed) && cJSON_GetArraySize(parsed) >= 3) {
                            cJSON* sub_id_json = cJSON_GetArrayItem(parsed, 1);
                            cJSON* event = cJSON_GetArrayItem(parsed, 2);
-                            
+
                            if (cJSON_IsString(sub_id_json) && event &&
                                strcmp(cJSON_GetStringValue(sub_id_json), relay->subscription_id) == 0) {
-                                
+
                                cJSON* event_id_json = cJSON_GetObjectItem(event, "id");
                                if (event_id_json && cJSON_IsString(event_id_json)) {
                                    const char* event_id = cJSON_GetStringValue(event_id_json);
-                                    
+
                                    // Check for duplicate
                                    int is_duplicate = 0;
                                    for (int j = 0; j < seen_count; j++) {
@@ -212,31 +260,31 @@ cJSON** synchronous_query_relays_with_progress(
                                            break;
                                        }
                                    }
-                                    
+
                                    if (!is_duplicate && seen_count < 1000) {
                                        // New event - add to seen list
                                        strncpy(seen_event_ids[seen_count], event_id, 64);
                                        seen_event_ids[seen_count][64] = '\0';
                                        seen_count++;
                                        total_unique_events++;
-                                        
+
                                        // Store event in relay's array
                                        if (relay->events_received >= relay->events_capacity) {
                                            relay->events_capacity *= 2;
-                                            relay->events = realloc(relay->events, 
+                                            relay->events = realloc(relay->events,
                                                relay->events_capacity * sizeof(cJSON*));
                                        }
-                                        
+
                                        relay->events[relay->events_received] = cJSON_Duplicate(event, 1);
                                        relay->events_received++;
                                        relay->state = RELAY_STATE_ACTIVE;
-                                        
+
                                        if (callback) {
-                                            callback(relay->url, "event_found", event_id, 
-                                                    relay->events_received, relay_count, 
+                                            callback(relay->url, "event_found", event_id,
+                                                    relay->events_received, relay_count,
                                                    completed_relays, user_data);
                                        }
-                                        
+
                                        // For FIRST_RESULT mode, return immediately
                                        if (mode == RELAY_QUERY_FIRST_RESULT) {
                                            result_array = malloc(sizeof(cJSON*));
@@ -244,7 +292,7 @@ cJSON** synchronous_query_relays_with_progress(
                                                result_array[0] = cJSON_Duplicate(event, 1);
                                                *result_count = 1;
                                                if (callback) {
-                                                    callback(NULL, "first_result", event_id, 
+                                                    callback(NULL, "first_result", event_id,
                                                            1, relay_count, completed_relays, user_data);
                                                }
                                            }
@@ -254,7 +302,7 @@ cJSON** synchronous_query_relays_with_progress(
                                }
                            }
                        }
-                        
+
                    } else if (msg_type && strcmp(msg_type, "EOSE") == 0) {
                        // Handle End of Stored Events
                        cJSON* sub_id_json = cJSON_GetArrayItem(parsed, 1);
@@ -400,7 +448,9 @@ publish_result_t* synchronous_publish_event_with_progress(
    int* success_count,
    int relay_timeout_seconds,
    publish_progress_callback_t callback,
-    void* user_data) {
+    void* user_data,
+    int nip42_enabled,
+    const unsigned char* private_key) {
    
    if (!relay_urls || relay_count <= 0 || !event || !success_count) {
        if (success_count) *success_count = 0;
@@ -443,7 +493,13 @@ publish_result_t* synchronous_publish_event_with_progress(
        relays[i].state = RELAY_STATE_CONNECTING;
        relays[i].last_activity = start_time;
        results[i] = PUBLISH_ERROR; // Default to error
-        
+
+        // Initialize NIP-42 authentication fields
+        relays[i].auth_state = NOSTR_AUTH_STATE_NONE;
+        memset(relays[i].auth_challenge, 0, sizeof(relays[i].auth_challenge));
+        relays[i].auth_challenge_time = 0;
+        relays[i].nip42_enabled = nip42_enabled;
+
        if (callback) {
            callback(relays[i].url, "connecting", NULL, 0, relay_count, 0, user_data);
        }
@@ -535,34 +591,65 @@ publish_result_t* synchronous_publish_event_with_progress(
                char* msg_type = NULL;
                cJSON* parsed = NULL;
                if (nostr_parse_relay_message(buffer, &msg_type, &parsed) == 0) {
-                    
-                    if (msg_type && strcmp(msg_type, "OK") == 0) {
+
+                    if (msg_type && strcmp(msg_type, "AUTH") == 0) {
+                        // Handle AUTH challenge message: ["AUTH", <challenge-string>]
+                        if (relay->nip42_enabled && private_key && cJSON_IsArray(parsed) && cJSON_GetArraySize(parsed) >= 2) {
+                            cJSON* challenge_json = cJSON_GetArrayItem(parsed, 1);
+                            if (cJSON_IsString(challenge_json)) {
+                                const char* challenge = cJSON_GetStringValue(challenge_json);
+
+                                // Store challenge and attempt authentication
+                                strncpy(relay->auth_challenge, challenge, sizeof(relay->auth_challenge) - 1);
+                                relay->auth_challenge[sizeof(relay->auth_challenge) - 1] = '\0';
+                                relay->auth_challenge_time = time(NULL);
+                                relay->auth_state = NOSTR_AUTH_STATE_CHALLENGE_RECEIVED;
+
+                                // Create and send authentication event
+                                cJSON* auth_event = nostr_nip42_create_auth_event(challenge, relay->url, private_key, 0);
+                                if (auth_event) {
+                                    char* auth_message = nostr_nip42_create_auth_message(auth_event);
+                                    if (auth_message) {
+                                        if (nostr_ws_send_text(relay->client, auth_message) >= 0) {
+                                            relay->auth_state = NOSTR_AUTH_STATE_AUTHENTICATING;
+                                            if (callback) {
+                                                callback(relay->url, "authenticating", NULL, 0, relay_count, completed_relays, user_data);
+                                            }
+                                        }
+                                        free(auth_message);
+                                    }
+                                    cJSON_Delete(auth_event);
+                                }
+                            }
+                        }
+
+                    } else if (msg_type && strcmp(msg_type, "OK") == 0) {
                        // Handle OK message: ["OK", <event_id>, <true|false>, <message>]
                        if (cJSON_IsArray(parsed) && cJSON_GetArraySize(parsed) >= 3) {
                            cJSON* ok_event_id = cJSON_GetArrayItem(parsed, 1);
                            cJSON* accepted = cJSON_GetArrayItem(parsed, 2);
                            cJSON* message = cJSON_GetArrayItem(parsed, 3);
-                            
+
                            // Verify this OK is for our event
                            if (ok_event_id && cJSON_IsString(ok_event_id) && event_id &&
                                strcmp(cJSON_GetStringValue(ok_event_id), event_id) == 0) {
-                                
+
                                relay->state = RELAY_STATE_EOSE_RECEIVED; // Reuse for "completed"
                                active_relays--;
                                completed_relays++;
-                                
+
                                const char* ok_message = "";
                                if (message && cJSON_IsString(message)) {
                                    ok_message = cJSON_GetStringValue(message);
                                }
-                                
+
                                if (accepted && cJSON_IsBool(accepted) && cJSON_IsTrue(accepted)) {
                                    // Event accepted
                                    results[i] = PUBLISH_SUCCESS;
                                    (*success_count)++;
                                    
                                    if (callback) {
-                                        callback(relay->url, "accepted", ok_message, 
+                                        callback(relay->url, "accepted", ok_message,
                                                *success_count, relay_count, completed_relays, user_data);
                                    }
                                } else {
@@ -570,11 +657,11 @@ publish_result_t* synchronous_publish_event_with_progress(
                                    results[i] = PUBLISH_REJECTED;
                                    
                                    if (callback) {
-                                        callback(relay->url, "rejected", ok_message, 
+                                        callback(relay->url, "rejected", ok_message,
                                                *success_count, relay_count, completed_relays, user_data);
                                    }
                                }
-                                
+
                                // Close connection
                                nostr_ws_close(relay->client);
                                relay->client = NULL;
@@ -1,15 +1,76 @@
 /*
 * NOSTR AES Implementation
- * 
+ *
 * Based on tiny-AES-c by kokke (public domain)
 * Configured specifically for NIP-04: AES-256-CBC only
- * 
+ *
 * This is an implementation of the AES algorithm, specifically CBC mode.
 * Configured for AES-256 as required by NIP-04.
 */

+#include <stdint.h>
+#include <stddef.h>
 #include <string.h> // CBC mode, for memset
-#include "nostr_aes.h"
+
+// Configure for NIP-04 requirements: AES-256-CBC only
+#define CBC 1
+#define ECB 0
+#define CTR 0
+
+// Configure for AES-256 (required by NIP-04)
+#define AES128 0
+#define AES192 0
+#define AES256 1
+
+#define AES_BLOCKLEN 16 // Block length in bytes - AES is 128b block only
+
+#if defined(AES256) && (AES256 == 1)
+    #define AES_KEYLEN 32
+    #define AES_keyExpSize 240
+#elif defined(AES192) && (AES192 == 1)
+    #define AES_KEYLEN 24
+    #define AES_keyExpSize 208
+#else
+    #define AES_KEYLEN 16   // Key length in bytes
+    #define AES_keyExpSize 176
+#endif
+
+struct AES_ctx
+{
+  uint8_t RoundKey[AES_keyExpSize];
+#if (defined(CBC) && (CBC == 1)) || (defined(CTR) && (CTR == 1))
+  uint8_t Iv[AES_BLOCKLEN];
+#endif
+};
+
+// state - array holding the intermediate results during decryption.
+typedef uint8_t state_t[4][4];
+
+// Function prototypes (internal use only)
+static void KeyExpansion(uint8_t* RoundKey, const uint8_t* Key);
+static void AddRoundKey(uint8_t round, state_t* state, const uint8_t* RoundKey);
+static void SubBytes(state_t* state);
+static void ShiftRows(state_t* state);
+static uint8_t xtime(uint8_t x);
+static void MixColumns(state_t* state);
+static void InvMixColumns(state_t* state);
+static void InvSubBytes(state_t* state);
+static void InvShiftRows(state_t* state);
+static void Cipher(state_t* state, const uint8_t* RoundKey);
+static void InvCipher(state_t* state, const uint8_t* RoundKey);
+static void XorWithIv(uint8_t* buf, const uint8_t* Iv);
+
+// Public functions (used by NIP-04 implementation)
+void AES_init_ctx(struct AES_ctx* ctx, const uint8_t* key);
+#if (defined(CBC) && (CBC == 1)) || (defined(CTR) && (CTR == 1))
+void AES_init_ctx_iv(struct AES_ctx* ctx, const uint8_t* key, const uint8_t* iv);
+void AES_ctx_set_iv(struct AES_ctx* ctx, const uint8_t* iv);
+#endif
+
+#if defined(CBC) && (CBC == 1)
+void AES_CBC_encrypt_buffer(struct AES_ctx* ctx, uint8_t* buf, size_t length);
+void AES_CBC_decrypt_buffer(struct AES_ctx* ctx, uint8_t* buf, size_t length);
+#endif

 // The number of columns comprising a state in AES. This is a constant in AES. Value=4
 #define Nb 4
@@ -1,15 +1,47 @@
 /*
 * nostr_chacha20.c - ChaCha20 stream cipher implementation
- * 
+ *
 * Implementation based on RFC 8439 "ChaCha20 and Poly1305 for IETF Protocols"
- * 
+ *
 * This implementation is adapted from the RFC 8439 reference specification.
 * It prioritizes correctness and clarity over performance optimization.
 */

-#include "nostr_chacha20.h"
+#include <stdint.h>
+#include <stddef.h>
 #include <string.h>

+/*
+ * ============================================================================
+ * CONSTANTS AND DEFINITIONS
+ * ============================================================================
+ */
+
+#define CHACHA20_KEY_SIZE    32  /* 256 bits */
+#define CHACHA20_NONCE_SIZE  12  /* 96 bits */
+#define CHACHA20_BLOCK_SIZE  64  /* 512 bits */
+
+/*
+ * ============================================================================
+ * FUNCTION PROTOTYPES (INTERNAL USE ONLY)
+ * ============================================================================
+ */
+
+// Internal utility functions
+static uint32_t bytes_to_u32_le(const uint8_t *bytes);
+static void u32_to_bytes_le(uint32_t val, uint8_t *bytes);
+
+// Public functions (used by NIP-44 implementation)
+void chacha20_quarter_round(uint32_t state[16], int a, int b, int c, int d);
+int chacha20_block(const uint8_t key[32], uint32_t counter,
+                   const uint8_t nonce[12], uint8_t output[64]);
+int chacha20_encrypt(const uint8_t key[32], uint32_t counter,
+                     const uint8_t nonce[12], const uint8_t* input,
+                     uint8_t* output, size_t length);
+void chacha20_init_state(uint32_t state[16], const uint8_t key[32],
+                         uint32_t counter, const uint8_t nonce[12]);
+void chacha20_serialize_state(const uint32_t state[16], uint8_t output[64]);
+
 /*
 * ============================================================================
 * UTILITY MACROS AND FUNCTIONS
@@ -1,4 +1,3 @@
-#include "nostr_secp256k1.h"
 #include <secp256k1.h>
 #include <secp256k1_schnorrsig.h>
 #include <secp256k1_ecdh.h>
@@ -6,6 +5,33 @@
 #include <stdlib.h>
 #include <fcntl.h>
 #include <unistd.h>
+#include <stddef.h>
+
+/*
+ * PRIVATE INTERNAL FUNCTIONS - NOT EXPORTED
+ * These functions are for internal library use only.
+ */
+
+/** Opaque data structure that holds a parsed and valid public key.
+ *  Guaranteed to be 64 bytes in size, and can be safely copied/moved.
+ */
+typedef struct nostr_secp256k1_pubkey {
+    unsigned char data[64];
+} nostr_secp256k1_pubkey;
+
+/** Opaque data structure that holds a parsed keypair.
+ *  Guaranteed to be 96 bytes in size, and can be safely copied/moved.
+ */
+typedef struct nostr_secp256k1_keypair {
+    unsigned char data[96];
+} nostr_secp256k1_keypair;
+
+/** Opaque data structure that holds a parsed x-only public key.
+ *  Guaranteed to be 64 bytes in size, and can be safely copied/moved.
+ */
+typedef struct nostr_secp256k1_xonly_pubkey {
+    unsigned char data[64];
+} nostr_secp256k1_xonly_pubkey;

 // Global context for secp256k1 operations
 static secp256k1_context* g_ctx = NULL;
@@ -0,0 +1,345 @@
+/*
+ * NOSTR Core Library - NIP-001: Basic Protocol Flow
+ * 
+ * Event creation, signing, serialization and core protocol functions
+ */
+
+#include "nip001.h"
+#include "utils.h"
+#include "../cjson/cJSON.h"
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <time.h>
+#include "../nostr_core/nostr_common.h"
+
+// Forward declarations for crypto functions (private API)
+// These functions are implemented in crypto/ but not exposed through public headers
+typedef struct {
+    unsigned char data[64];
+} nostr_secp256k1_xonly_pubkey;
+
+int nostr_secp256k1_xonly_pubkey_parse(nostr_secp256k1_xonly_pubkey* pubkey, const unsigned char* input32);
+int nostr_secp256k1_schnorrsig_verify(const unsigned char* sig64, const unsigned char* msg32, const nostr_secp256k1_xonly_pubkey* pubkey);
+
+// Declare utility functions
+void nostr_bytes_to_hex(const unsigned char* bytes, size_t len, char* hex);
+int nostr_hex_to_bytes(const char* hex, unsigned char* bytes, size_t len);
+int nostr_sha256(const unsigned char* data, size_t len, unsigned char* hash);
+int nostr_ec_public_key_from_private_key(const unsigned char* private_key, unsigned char* public_key);
+int nostr_ec_sign(const unsigned char* private_key, const unsigned char* hash, unsigned char* signature);
+
+/**
+ * Create and sign a NOSTR event
+ */
+cJSON* nostr_create_and_sign_event(int kind, const char* content, cJSON* tags, const unsigned char* private_key, time_t timestamp) {
+    if (!private_key) {
+        return NULL;
+    }
+    
+    if (!content) {
+        content = ""; // Default to empty content
+    }
+    
+    // Convert private key to public key
+    unsigned char public_key[32];
+    if (nostr_ec_public_key_from_private_key(private_key, public_key) != 0) {
+        return NULL;
+    }
+    
+    // Convert public key to hex
+    char pubkey_hex[65];
+    nostr_bytes_to_hex(public_key, 32, pubkey_hex);
+    
+    // Create event structure
+    cJSON* event = cJSON_CreateObject();
+    if (!event) {
+        return NULL;
+    }
+    
+    // Use provided timestamp or current time if timestamp is 0
+    time_t event_time = (timestamp == 0) ? time(NULL) : timestamp;
+    
+    cJSON_AddStringToObject(event, "pubkey", pubkey_hex);
+    cJSON_AddNumberToObject(event, "created_at", (double)event_time);
+    cJSON_AddNumberToObject(event, "kind", kind);
+    
+    // Add tags (copy provided tags or create empty array)
+    if (tags) {
+        cJSON_AddItemToObject(event, "tags", cJSON_Duplicate(tags, 1));
+    } else {
+        cJSON_AddItemToObject(event, "tags", cJSON_CreateArray());
+    }
+    
+    cJSON_AddStringToObject(event, "content", content);
+    
+    // ============================================================================
+    // INLINE SERIALIZATION AND SIGNING LOGIC 
+    // ============================================================================
+    
+    // Get event fields for serialization
+    cJSON* pubkey_item = cJSON_GetObjectItem(event, "pubkey");
+    cJSON* created_at_item = cJSON_GetObjectItem(event, "created_at");
+    cJSON* kind_item = cJSON_GetObjectItem(event, "kind");
+    cJSON* tags_item = cJSON_GetObjectItem(event, "tags");
+    cJSON* content_item = cJSON_GetObjectItem(event, "content");
+    
+    if (!pubkey_item || !created_at_item || !kind_item || !tags_item || !content_item) {
+        cJSON_Delete(event);
+        return NULL;
+    }
+    
+    // Create serialization array: [0, pubkey, created_at, kind, tags, content]
+    cJSON* serialize_array = cJSON_CreateArray();
+    if (!serialize_array) {
+        cJSON_Delete(event);
+        return NULL;
+    }
+    
+    cJSON_AddItemToArray(serialize_array, cJSON_CreateNumber(0));
+    cJSON_AddItemToArray(serialize_array, cJSON_Duplicate(pubkey_item, 1));
+    cJSON_AddItemToArray(serialize_array, cJSON_Duplicate(created_at_item, 1));
+    cJSON_AddItemToArray(serialize_array, cJSON_Duplicate(kind_item, 1));
+    cJSON_AddItemToArray(serialize_array, cJSON_Duplicate(tags_item, 1));
+    cJSON_AddItemToArray(serialize_array, cJSON_Duplicate(content_item, 1));
+    
+    char* serialize_string = cJSON_PrintUnformatted(serialize_array);
+    cJSON_Delete(serialize_array);
+    
+    if (!serialize_string) {
+        cJSON_Delete(event);
+        return NULL;
+    }
+    
+    // Hash the serialized event
+    unsigned char event_hash[32];
+    if (nostr_sha256((const unsigned char*)serialize_string, strlen(serialize_string), event_hash) != 0) {
+        free(serialize_string);
+        cJSON_Delete(event);
+        return NULL;
+    }
+    
+    // Convert hash to hex for event ID
+    char event_id[65];
+    nostr_bytes_to_hex(event_hash, 32, event_id);
+    
+    // Sign the hash using ECDSA
+    unsigned char signature[64];
+    if (nostr_ec_sign(private_key, event_hash, signature) != 0) {
+        free(serialize_string);
+        cJSON_Delete(event);
+        return NULL;
+    }
+    
+    // Convert signature to hex
+    char sig_hex[129];
+    nostr_bytes_to_hex(signature, 64, sig_hex);
+    
+    // Add ID and signature to the event
+    cJSON_AddStringToObject(event, "id", event_id);
+    cJSON_AddStringToObject(event, "sig", sig_hex);
+    
+    free(serialize_string);
+    
+    return event;
+}
+
+/**
+ * Validate the structure of a NOSTR event
+ * Checks required fields, types, and basic format validation
+ */
+int nostr_validate_event_structure(cJSON* event) {
+    if (!event || !cJSON_IsObject(event)) {
+        return NOSTR_ERROR_EVENT_INVALID_STRUCTURE;
+    }
+    
+    // Check required fields exist
+    cJSON* id_item = cJSON_GetObjectItem(event, "id");
+    cJSON* pubkey_item = cJSON_GetObjectItem(event, "pubkey");
+    cJSON* created_at_item = cJSON_GetObjectItem(event, "created_at");
+    cJSON* kind_item = cJSON_GetObjectItem(event, "kind");
+    cJSON* tags_item = cJSON_GetObjectItem(event, "tags");
+    cJSON* content_item = cJSON_GetObjectItem(event, "content");
+    cJSON* sig_item = cJSON_GetObjectItem(event, "sig");
+    
+    if (!id_item || !pubkey_item || !created_at_item || !kind_item || 
+        !tags_item || !content_item || !sig_item) {
+        return NOSTR_ERROR_EVENT_INVALID_STRUCTURE;
+    }
+    
+    // Validate field types
+    if (!cJSON_IsString(id_item)) return NOSTR_ERROR_EVENT_INVALID_ID;
+    if (!cJSON_IsString(pubkey_item)) return NOSTR_ERROR_EVENT_INVALID_PUBKEY;
+    if (!cJSON_IsNumber(created_at_item)) return NOSTR_ERROR_EVENT_INVALID_CREATED_AT;
+    if (!cJSON_IsNumber(kind_item)) return NOSTR_ERROR_EVENT_INVALID_KIND;
+    if (!cJSON_IsArray(tags_item)) return NOSTR_ERROR_EVENT_INVALID_TAGS;
+    if (!cJSON_IsString(content_item)) return NOSTR_ERROR_EVENT_INVALID_CONTENT;
+    if (!cJSON_IsString(sig_item)) return NOSTR_ERROR_EVENT_INVALID_SIGNATURE;
+    
+    // Validate hex string lengths
+    const char* id_str = cJSON_GetStringValue(id_item);
+    const char* pubkey_str = cJSON_GetStringValue(pubkey_item);
+    const char* sig_str = cJSON_GetStringValue(sig_item);
+    
+    if (!id_str || strlen(id_str) != 64) return NOSTR_ERROR_EVENT_INVALID_ID;
+    if (!pubkey_str || strlen(pubkey_str) != 64) return NOSTR_ERROR_EVENT_INVALID_PUBKEY;
+    if (!sig_str || strlen(sig_str) != 128) return NOSTR_ERROR_EVENT_INVALID_SIGNATURE;
+    
+    // Validate hex characters (lowercase)
+    for (int i = 0; i < 64; i++) {
+        char c = id_str[i];
+        if (!((c >= '0' && c <= '9') || (c >= 'a' && c <= 'f'))) {
+            return NOSTR_ERROR_EVENT_INVALID_ID;
+        }
+        c = pubkey_str[i];
+        if (!((c >= '0' && c <= '9') || (c >= 'a' && c <= 'f'))) {
+            return NOSTR_ERROR_EVENT_INVALID_PUBKEY;
+        }
+    }
+    
+    // Validate signature hex characters (lowercase) - 128 characters
+    for (int i = 0; i < 128; i++) {
+        char c = sig_str[i];
+        if (!((c >= '0' && c <= '9') || (c >= 'a' && c <= 'f'))) {
+            return NOSTR_ERROR_EVENT_INVALID_SIGNATURE;
+        }
+    }
+    
+    // Validate created_at is a valid timestamp (positive number)
+    double created_at = cJSON_GetNumberValue(created_at_item);
+    if (created_at < 0) return NOSTR_ERROR_EVENT_INVALID_CREATED_AT;
+    
+    // Validate kind is valid (0-65535)
+    double kind = cJSON_GetNumberValue(kind_item);
+    if (kind < 0 || kind > 65535 || kind != (int)kind) {
+        return NOSTR_ERROR_EVENT_INVALID_KIND;
+    }
+    
+    // Validate tags array structure (array of arrays of strings)
+    cJSON* tag_item;
+    cJSON_ArrayForEach(tag_item, tags_item) {
+        if (!cJSON_IsArray(tag_item)) {
+            return NOSTR_ERROR_EVENT_INVALID_TAGS;
+        }
+        cJSON* tag_element;
+        cJSON_ArrayForEach(tag_element, tag_item) {
+            if (!cJSON_IsString(tag_element)) {
+                return NOSTR_ERROR_EVENT_INVALID_TAGS;
+            }
+        }
+    }
+    
+    return NOSTR_SUCCESS;
+}
+
+/**
+ * Verify the cryptographic signature of a NOSTR event
+ * Validates event ID and signature according to NIP-01
+ */
+int nostr_verify_event_signature(cJSON* event) {
+    if (!event) {
+        return NOSTR_ERROR_INVALID_INPUT;
+    }
+    
+    // Get event fields
+    cJSON* id_item = cJSON_GetObjectItem(event, "id");
+    cJSON* pubkey_item = cJSON_GetObjectItem(event, "pubkey");
+    cJSON* created_at_item = cJSON_GetObjectItem(event, "created_at");
+    cJSON* kind_item = cJSON_GetObjectItem(event, "kind");
+    cJSON* tags_item = cJSON_GetObjectItem(event, "tags");
+    cJSON* content_item = cJSON_GetObjectItem(event, "content");
+    cJSON* sig_item = cJSON_GetObjectItem(event, "sig");
+    
+    if (!id_item || !pubkey_item || !created_at_item || !kind_item || 
+        !tags_item || !content_item || !sig_item) {
+        return NOSTR_ERROR_EVENT_INVALID_STRUCTURE;
+    }
+    
+    // Create serialization array: [0, pubkey, created_at, kind, tags, content]
+    cJSON* serialize_array = cJSON_CreateArray();
+    if (!serialize_array) {
+        return NOSTR_ERROR_MEMORY_FAILED;
+    }
+    
+    cJSON_AddItemToArray(serialize_array, cJSON_CreateNumber(0));
+    cJSON_AddItemToArray(serialize_array, cJSON_Duplicate(pubkey_item, 1));
+    cJSON_AddItemToArray(serialize_array, cJSON_Duplicate(created_at_item, 1));
+    cJSON_AddItemToArray(serialize_array, cJSON_Duplicate(kind_item, 1));
+    cJSON_AddItemToArray(serialize_array, cJSON_Duplicate(tags_item, 1));
+    cJSON_AddItemToArray(serialize_array, cJSON_Duplicate(content_item, 1));
+    
+    char* serialize_string = cJSON_PrintUnformatted(serialize_array);
+    cJSON_Delete(serialize_array);
+    
+    if (!serialize_string) {
+        return NOSTR_ERROR_MEMORY_FAILED;
+    }
+    
+    // Hash the serialized event
+    unsigned char event_hash[32];
+    if (nostr_sha256((const unsigned char*)serialize_string, strlen(serialize_string), event_hash) != 0) {
+        free(serialize_string);
+        return NOSTR_ERROR_CRYPTO_FAILED;
+    }
+    
+    // Convert hash to hex for event ID verification
+    char calculated_id[65];
+    nostr_bytes_to_hex(event_hash, 32, calculated_id);
+    
+    // Compare with provided event ID
+    const char* provided_id = cJSON_GetStringValue(id_item);
+    if (!provided_id || strcmp(calculated_id, provided_id) != 0) {
+        free(serialize_string);
+        return NOSTR_ERROR_EVENT_INVALID_ID;
+    }
+    
+    // Verify signature
+    const char* pubkey_str = cJSON_GetStringValue(pubkey_item);
+    const char* sig_str = cJSON_GetStringValue(sig_item);
+    
+    if (!pubkey_str || !sig_str) {
+        free(serialize_string);
+        return NOSTR_ERROR_EVENT_INVALID_STRUCTURE;
+    }
+    
+    // Convert hex strings to bytes
+    unsigned char pubkey_bytes[32];
+    unsigned char sig_bytes[64];
+    
+    if (nostr_hex_to_bytes(pubkey_str, pubkey_bytes, 32) != 0 ||
+        nostr_hex_to_bytes(sig_str, sig_bytes, 64) != 0) {
+        free(serialize_string);
+        return NOSTR_ERROR_CRYPTO_FAILED;
+    }
+    
+    // Parse the public key into secp256k1 format
+    nostr_secp256k1_xonly_pubkey xonly_pubkey;
+    if (!nostr_secp256k1_xonly_pubkey_parse(&xonly_pubkey, pubkey_bytes)) {
+        free(serialize_string);
+        return NOSTR_ERROR_EVENT_INVALID_PUBKEY;
+    }
+    
+    // Verify Schnorr signature
+    if (!nostr_secp256k1_schnorrsig_verify(sig_bytes, event_hash, &xonly_pubkey)) {
+        free(serialize_string);
+        return NOSTR_ERROR_EVENT_INVALID_SIGNATURE;
+    }
+    
+    free(serialize_string);
+    return NOSTR_SUCCESS;
+}
+
+/**
+ * Complete validation of a NOSTR event
+ * Performs both structure and cryptographic validation
+ */
+int nostr_validate_event(cJSON* event) {
+    // First validate structure (fast check)
+    int structure_result = nostr_validate_event_structure(event);
+    if (structure_result != NOSTR_SUCCESS) {
+        return structure_result;
+    }
+    
+    // Then verify signature (expensive check)
+    return nostr_verify_event_signature(event);
+}
@@ -0,0 +1,23 @@
+/*
+ * NOSTR Core Library - NIP-001: Basic Protocol Flow
+ * 
+ * Event creation, signing, serialization and core protocol functions
+ */
+
+#ifndef NIP001_H
+#define NIP001_H
+
+#include <stdint.h>
+#include <time.h>
+#include "../cjson/cJSON.h"
+
+
+// Function declarations
+cJSON* nostr_create_and_sign_event(int kind, const char* content, cJSON* tags, const unsigned char* private_key, time_t timestamp);
+
+// Event validation functions
+int nostr_validate_event_structure(cJSON* event);
+int nostr_verify_event_signature(cJSON* event);
+int nostr_validate_event(cJSON* event);
+
+#endif // NIP001_H
@@ -0,0 +1,347 @@
+/*
+ * NIP-04: Encrypted Direct Message Implementation
+ * https://github.com/nostr-protocol/nips/blob/master/04.md
+ */
+
+#include "nip004.h"
+#include "utils.h"
+#include "nostr_common.h"
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+// Forward declarations for crypto functions (private API)
+// These functions are implemented in crypto/ but not exposed through public headers
+int ecdh_shared_secret(const unsigned char* private_key, const unsigned char* public_key, unsigned char* shared_secret);
+int nostr_secp256k1_get_random_bytes(unsigned char* buf, size_t len);
+
+// AES context and functions for NIP-04 encryption
+struct AES_ctx {
+    unsigned char RoundKey[240];  // AES-256 key expansion
+    unsigned char Iv[16];         // Initialization vector
+};
+
+void AES_init_ctx_iv(struct AES_ctx* ctx, const unsigned char* key, const unsigned char* iv);
+void AES_CBC_encrypt_buffer(struct AES_ctx* ctx, unsigned char* buf, size_t length);
+void AES_CBC_decrypt_buffer(struct AES_ctx* ctx, unsigned char* buf, size_t length);
+
+// Forward declarations for internal functions
+static int aes_cbc_encrypt(const unsigned char* key, const unsigned char* iv,
+                          const unsigned char* input, size_t input_len,
+                          unsigned char* output);
+static int aes_cbc_decrypt(const unsigned char* key, const unsigned char* iv,
+                          const unsigned char* input, size_t input_len,
+                          unsigned char* output);
+static size_t pkcs7_pad(unsigned char* data, size_t data_len, size_t block_size);
+static size_t pkcs7_unpad(unsigned char* data, size_t data_len);
+
+// Memory clearing utility
+static void memory_clear(const void *p, size_t len) {
+    if (p && len) {
+        memset((void *)p, 0, len);
+    }
+}
+
+// =============================================================================
+// AES-256-CBC ENCRYPTION/DECRYPTION USING TINYAES
+// =============================================================================
+
+static int aes_cbc_encrypt(const unsigned char* key, const unsigned char* iv,
+                          const unsigned char* input, size_t input_len,
+                          unsigned char* output) {
+    if (!key || !iv || !input || !output || input_len % 16 != 0) {
+        return -1;
+    }
+    
+    // Initialize AES context with key and IV
+    struct AES_ctx ctx;
+    AES_init_ctx_iv(&ctx, key, iv);
+    
+    // Copy input to output (tinyAES works in-place)
+    memcpy(output, input, input_len);
+    
+    // Encrypt using AES-256-CBC
+    AES_CBC_encrypt_buffer(&ctx, output, input_len);
+    
+    return 0;
+}
+
+static int aes_cbc_decrypt(const unsigned char* key, const unsigned char* iv,
+                          const unsigned char* input, size_t input_len,
+                          unsigned char* output) {
+    if (!key || !iv || !input || !output || input_len % 16 != 0) {
+        return -1;
+    }
+    
+    // Initialize AES context with key and IV
+    struct AES_ctx ctx;
+    AES_init_ctx_iv(&ctx, key, iv);
+    
+    // Copy input to output (tinyAES works in-place)
+    memcpy(output, input, input_len);
+    
+    // Decrypt using AES-256-CBC
+    AES_CBC_decrypt_buffer(&ctx, output, input_len);
+    
+    return 0;
+}
+
+// PKCS#7 padding functions
+static size_t pkcs7_pad(unsigned char* data, size_t data_len, size_t block_size) {
+    size_t padding = block_size - (data_len % block_size);
+    for (size_t i = 0; i < padding; i++) {
+        data[data_len + i] = (unsigned char)padding;
+    }
+    return data_len + padding;
+}
+
+static size_t pkcs7_unpad(unsigned char* data, size_t data_len) {
+    if (data_len == 0) return 0;
+    
+    unsigned char padding = data[data_len - 1];
+    if (padding == 0 || padding > 16) return 0; // Invalid padding
+    
+    // Verify padding
+    for (size_t i = data_len - padding; i < data_len; i++) {
+        if (data[i] != padding) return 0; // Invalid padding
+    }
+    
+    return data_len - padding;
+}
+
+// =============================================================================
+// NIP-04 IMPLEMENTATION
+// =============================================================================
+
+int nostr_nip04_encrypt(const unsigned char* sender_private_key,
+                       const unsigned char* recipient_public_key, 
+                       const char* plaintext,
+                       char* output,
+                       size_t output_size) {
+    if (!sender_private_key || !recipient_public_key || !plaintext || !output) {
+        return NOSTR_ERROR_INVALID_INPUT;
+    }
+    
+    size_t plaintext_len = strlen(plaintext);
+    
+    if (plaintext_len > NOSTR_NIP04_MAX_PLAINTEXT_SIZE) {
+        return NOSTR_ERROR_NIP04_BUFFER_TOO_SMALL;
+    }
+    
+    // FIX: Calculate final size requirements EARLY before any allocations
+    // CRITICAL: Account for PKCS#7 padding which ALWAYS adds 1-16 bytes
+    // If plaintext_len is a multiple of 16, PKCS#7 adds a full 16-byte block
+    size_t padded_len = ((plaintext_len / 16) + 1) * 16; // Always add one full block for PKCS#7
+    size_t ciphertext_b64_max = ((padded_len + 2) / 3) * 4 + 1;
+    size_t iv_b64_max = ((16 + 2) / 3) * 4 + 1;  // Always 25 bytes
+    size_t estimated_result_len = ciphertext_b64_max + 4 + iv_b64_max;  // +4 for "?iv="
+    
+    // FIX: Check output buffer size BEFORE doing any work
+    if (estimated_result_len > output_size) {
+        return NOSTR_ERROR_NIP04_BUFFER_TOO_SMALL;
+    }
+    
+    // Step 1: Compute ECDH shared secret
+    unsigned char shared_secret[32];
+    if (ecdh_shared_secret(sender_private_key, recipient_public_key, shared_secret) != 0) {
+        return NOSTR_ERROR_CRYPTO_FAILED;
+    }
+    
+    // Step 2: Generate random IV (16 bytes)
+    unsigned char iv[16];
+        if (nostr_secp256k1_get_random_bytes(iv, 16) != 1) {
+        return NOSTR_ERROR_CRYPTO_FAILED;
+    }
+    
+    // Step 3: Pad plaintext using PKCS#7
+    unsigned char* padded_data = malloc(padded_len);
+    if (!padded_data) {
+        return NOSTR_ERROR_MEMORY_FAILED;
+    }
+    
+    memcpy(padded_data, plaintext, plaintext_len);
+    size_t actual_padded_len = pkcs7_pad(padded_data, plaintext_len, 16);
+    
+    // Step 4: Encrypt using AES-256-CBC
+    unsigned char* ciphertext = malloc(padded_len);
+    if (!ciphertext) {
+        free(padded_data);
+        return NOSTR_ERROR_MEMORY_FAILED;
+    }
+    
+    if (aes_cbc_encrypt(shared_secret, iv, padded_data, actual_padded_len, ciphertext) != 0) {
+        free(padded_data);
+        free(ciphertext);
+        return NOSTR_ERROR_CRYPTO_FAILED;
+    }
+    
+    // Step 5: Base64 encode ciphertext and IV
+    size_t ciphertext_b64_len = ((actual_padded_len + 2) / 3) * 4 + 1;
+    size_t iv_b64_len = ((16 + 2) / 3) * 4 + 1;
+    
+    char* ciphertext_b64 = malloc(ciphertext_b64_len);
+    char* iv_b64 = malloc(iv_b64_len);
+    
+    if (!ciphertext_b64 || !iv_b64) {
+        free(padded_data);
+        free(ciphertext);
+        free(ciphertext_b64);
+        free(iv_b64);
+        return NOSTR_ERROR_MEMORY_FAILED;
+    }
+    
+    // FIX: Pass buffer sizes to base64_encode and check for success
+    size_t ct_b64_len = base64_encode(ciphertext, actual_padded_len, ciphertext_b64, ciphertext_b64_len);
+    size_t iv_b64_len_actual = base64_encode(iv, 16, iv_b64, iv_b64_len);
+    
+    // FIX: Check if encoding succeeded
+    if (ct_b64_len == 0 || iv_b64_len_actual == 0) {
+        free(padded_data);
+        free(ciphertext);
+        free(ciphertext_b64);
+        free(iv_b64);
+        memory_clear(shared_secret, 32);
+        return NOSTR_ERROR_CRYPTO_FAILED;
+    }
+    
+    // Step 6: Format as "ciphertext?iv=iv_base64" - size check moved earlier, now guaranteed to fit
+    size_t result_len = ct_b64_len + 4 + iv_b64_len_actual + 1; // +4 for "?iv=", +1 for null
+    
+    if (result_len > output_size) {
+        free(padded_data);
+        free(ciphertext);
+        free(ciphertext_b64);
+        free(iv_b64);
+        memory_clear(shared_secret, 32);
+        return NOSTR_ERROR_NIP04_BUFFER_TOO_SMALL;
+    }
+    
+    snprintf(output, output_size, "%s?iv=%s", ciphertext_b64, iv_b64);
+    
+    // Cleanup
+    memory_clear(shared_secret, 32);
+    memory_clear(padded_data, padded_len);
+    memory_clear(ciphertext, padded_len);
+    free(padded_data);
+    free(ciphertext);
+    free(ciphertext_b64);
+    free(iv_b64);
+    
+    return NOSTR_SUCCESS;
+}
+
+int nostr_nip04_decrypt(const unsigned char* recipient_private_key,
+                       const unsigned char* sender_public_key,
+                       const char* encrypted_data,
+                       char* output,
+                       size_t output_size) {
+    if (!recipient_private_key || !sender_public_key || !encrypted_data || !output) {
+        return NOSTR_ERROR_INVALID_INPUT;
+    }
+    
+    // Step 1: Parse encrypted data format "ciphertext?iv=iv_base64"
+    char* separator = strstr(encrypted_data, "?iv=");
+    if (!separator) {
+        return NOSTR_ERROR_NIP04_INVALID_FORMAT;
+    }
+    
+    size_t ciphertext_b64_len = separator - encrypted_data;
+    const char* iv_b64 = separator + 4; // Skip "?iv="
+    
+    if (ciphertext_b64_len == 0 || strlen(iv_b64) == 0) {
+        return NOSTR_ERROR_NIP04_INVALID_FORMAT;
+    }
+    
+    // Step 2: Create null-terminated copy of ciphertext base64
+    char* ciphertext_b64 = malloc(ciphertext_b64_len + 1);
+    if (!ciphertext_b64) {
+        return NOSTR_ERROR_MEMORY_FAILED;
+    }
+    
+    memcpy(ciphertext_b64, encrypted_data, ciphertext_b64_len);
+    ciphertext_b64[ciphertext_b64_len] = '\0';
+    
+    // Step 3: Calculate proper buffer sizes for decoded data
+    // Base64 decoding: 4 chars -> 3 bytes, so max decoded size is (len * 3) / 4
+    size_t max_ciphertext_len = ((ciphertext_b64_len + 3) / 4) * 3;
+    size_t max_iv_len = ((strlen(iv_b64) + 3) / 4) * 3;
+    
+    // Allocate buffers with proper sizes
+    unsigned char* ciphertext = malloc(max_ciphertext_len);
+    unsigned char* iv_buffer = malloc(max_iv_len);
+    
+    if (!ciphertext || !iv_buffer) {
+        free(ciphertext_b64);
+        free(ciphertext);
+        free(iv_buffer);
+        return NOSTR_ERROR_MEMORY_FAILED;
+    }
+    
+    // Step 4: Base64 decode ciphertext and IV
+    size_t ciphertext_len = base64_decode(ciphertext_b64, ciphertext);
+    size_t iv_len = base64_decode(iv_b64, iv_buffer);
+    
+    if (ciphertext_len == 0 || iv_len != 16 || ciphertext_len % 16 != 0) {
+        free(ciphertext_b64);
+        free(ciphertext);
+        free(iv_buffer);
+        return NOSTR_ERROR_NIP04_INVALID_FORMAT;
+    }
+    
+    // Copy IV to fixed-size buffer for safety
+    unsigned char iv[16];
+    memcpy(iv, iv_buffer, 16);
+    free(iv_buffer);
+    
+    // Step 5: Compute ECDH shared secret
+    unsigned char shared_secret[32];
+    if (ecdh_shared_secret(recipient_private_key, sender_public_key, shared_secret) != 0) {
+        free(ciphertext_b64);
+        free(ciphertext);
+        return NOSTR_ERROR_CRYPTO_FAILED;
+    }
+    
+    // Step 6: Decrypt using AES-256-CBC
+    unsigned char* plaintext_padded = malloc(ciphertext_len);
+    if (!plaintext_padded) {
+        free(ciphertext_b64);
+        free(ciphertext);
+        return NOSTR_ERROR_MEMORY_FAILED;
+    }
+    
+    if (aes_cbc_decrypt(shared_secret, iv, ciphertext, ciphertext_len, plaintext_padded) != 0) {
+        free(ciphertext_b64);
+        free(ciphertext);
+        free(plaintext_padded);
+        return NOSTR_ERROR_NIP04_DECRYPT_FAILED;
+    }
+    
+    // Step 7: Remove PKCS#7 padding
+    size_t plaintext_len = pkcs7_unpad(plaintext_padded, ciphertext_len);
+    if (plaintext_len == 0 || plaintext_len > ciphertext_len) {
+        free(ciphertext_b64);
+        free(ciphertext);
+        free(plaintext_padded);
+        return NOSTR_ERROR_NIP04_DECRYPT_FAILED;
+    }
+    
+    // Step 8: Copy to output buffer and null-terminate
+    if (plaintext_len + 1 > output_size) {
+        free(ciphertext_b64);
+        free(ciphertext);
+        free(plaintext_padded);
+        return NOSTR_ERROR_NIP04_BUFFER_TOO_SMALL;
+    }
+    
+    memcpy(output, plaintext_padded, plaintext_len);
+    output[plaintext_len] = '\0';
+    
+    // Cleanup
+    memory_clear(shared_secret, 32);
+    memory_clear(plaintext_padded, ciphertext_len);
+    free(ciphertext_b64);
+    free(ciphertext);
+    free(plaintext_padded);
+    
+    return NOSTR_SUCCESS;
+}
@@ -0,0 +1,56 @@
+/*
+ * NIP-04: Encrypted Direct Message
+ * https://github.com/nostr-protocol/nips/blob/master/04.md
+ */
+
+#ifndef NOSTR_NIP004_H
+#define NOSTR_NIP004_H
+
+#include <stddef.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+// NIP-04 constants
+// #define NOSTR_NIP04_MAX_PLAINTEXT_SIZE 1048576    // 1MB
+// NIP-04 Constants
+// #define NOSTR_NIP04_MAX_PLAINTEXT_SIZE 16777216    // 16MB
+// #define NOSTR_NIP04_MAX_ENCRYPTED_SIZE 22369621    // ~21.3MB (accounts for base64 overhead + IV)
+/**
+ * NIP-04: Encrypt a message using ECDH + AES-256-CBC
+ * 
+ * @param sender_private_key 32-byte sender private key
+ * @param recipient_public_key 32-byte recipient public key (x-only)
+ * @param plaintext Message to encrypt
+ * @param output Buffer for encrypted output (format: "ciphertext?iv=iv_base64")
+ * @param output_size Size of output buffer
+ * @return NOSTR_SUCCESS on success, error code on failure
+ */
+int nostr_nip04_encrypt(const unsigned char* sender_private_key,
+                       const unsigned char* recipient_public_key, 
+                       const char* plaintext,
+                       char* output,
+                       size_t output_size);
+
+/**
+ * NIP-04: Decrypt a message using ECDH + AES-256-CBC
+ * 
+ * @param recipient_private_key 32-byte recipient private key
+ * @param sender_public_key 32-byte sender public key (x-only)
+ * @param encrypted_data Encrypted message (format: "ciphertext?iv=iv_base64")
+ * @param output Buffer for decrypted plaintext
+ * @param output_size Size of output buffer
+ * @return NOSTR_SUCCESS on success, error code on failure
+ */
+int nostr_nip04_decrypt(const unsigned char* recipient_private_key,
+                       const unsigned char* sender_public_key,
+                       const char* encrypted_data,
+                       char* output,
+                       size_t output_size);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif // NOSTR_NIP004_H
@@ -0,0 +1,344 @@
+/*
+ * NOSTR Core Library - NIP-005: Mapping Nostr keys to DNS-based internet identifiers
+ */
+
+#include "nip005.h"
+#include "../cjson/cJSON.h"
+#include "nostr_common.h"
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <strings.h>  // For strcasecmp
+#include <ctype.h>
+
+
+#include <curl/curl.h>
+
+
+// Structure for HTTP response handling
+typedef struct {
+    char* data;
+    size_t size;
+    size_t capacity;
+} nip05_http_response_t;
+
+/**
+ * Callback function for curl to write HTTP response data
+ */
+static size_t nip05_write_callback(void* contents, size_t size, size_t nmemb, void* userp) {
+    nip05_http_response_t* response = (nip05_http_response_t*)userp;
+    size_t total_size = size * nmemb;
+    
+    // Check if we need to expand the buffer
+    if (response->size + total_size >= response->capacity) {
+        size_t new_capacity = response->capacity * 2;
+        if (new_capacity < response->size + total_size + 1) {
+            new_capacity = response->size + total_size + 1;
+        }
+        
+        char* new_data = realloc(response->data, new_capacity);
+        if (!new_data) {
+            return 0; // Out of memory
+        }
+        
+        response->data = new_data;
+        response->capacity = new_capacity;
+    }
+    
+    // Append the new data
+    memcpy(response->data + response->size, contents, total_size);
+    response->size += total_size;
+    response->data[response->size] = '\0';
+    
+    return total_size;
+}
+
+/**
+ * Parse and validate a NIP-05 identifier into local part and domain
+ */
+static int nip05_parse_identifier(const char* identifier, char* local_part, char* domain) {
+    if (!identifier || !local_part || !domain) {
+        return NOSTR_ERROR_INVALID_INPUT;
+    }
+    
+    // Find the @ symbol
+    const char* at_pos = strchr(identifier, '@');
+    if (!at_pos) {
+        return NOSTR_ERROR_NIP05_INVALID_IDENTIFIER;
+    }
+    
+    // Extract local part
+    size_t local_len = at_pos - identifier;
+    if (local_len == 0 || local_len >= 64) {
+        return NOSTR_ERROR_NIP05_INVALID_IDENTIFIER;
+    }
+    
+    strncpy(local_part, identifier, local_len);
+    local_part[local_len] = '\0';
+    
+    // Extract domain
+    const char* domain_start = at_pos + 1;
+    size_t domain_len = strlen(domain_start);
+    if (domain_len == 0 || domain_len >= 256) {
+        return NOSTR_ERROR_NIP05_INVALID_IDENTIFIER;
+    }
+    
+    strcpy(domain, domain_start);
+    
+    // Validate characters in local part (a-z0-9-_.)
+    for (size_t i = 0; i < local_len; i++) {
+        char c = local_part[i];
+        if (!((c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z') || 
+              (c >= '0' && c <= '9') || c == '-' || c == '_' || c == '.')) {
+            return NOSTR_ERROR_NIP05_INVALID_IDENTIFIER;
+        }
+    }
+    
+    return NOSTR_SUCCESS;
+}
+
+/**
+ * Make HTTP GET request to a URL
+ */
+static int nip05_http_get(const char* url, int timeout_seconds, char** response_data) {
+    if (!url || !response_data) {
+        return NOSTR_ERROR_INVALID_INPUT;
+    }
+    
+    CURL* curl = curl_easy_init();
+    if (!curl) {
+        return NOSTR_ERROR_NETWORK_FAILED;
+    }
+    
+    nip05_http_response_t response = {0};
+    response.capacity = 1024;
+    response.data = malloc(response.capacity);
+    if (!response.data) {
+        curl_easy_cleanup(curl);
+        return NOSTR_ERROR_MEMORY_FAILED;
+    }
+    response.data[0] = '\0';
+    
+    // Set curl options with proper type casting to fix warnings
+    curl_easy_setopt(curl, CURLOPT_URL, url);
+    curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, (curl_write_callback)nip05_write_callback);
+    curl_easy_setopt(curl, CURLOPT_WRITEDATA, &response);
+    curl_easy_setopt(curl, CURLOPT_TIMEOUT, (long)(timeout_seconds > 0 ? timeout_seconds : NIP05_DEFAULT_TIMEOUT));
+    curl_easy_setopt(curl, CURLOPT_FOLLOWLOCATION, 0L); // NIP-05 forbids redirects
+    curl_easy_setopt(curl, CURLOPT_SSL_VERIFYPEER, 1L);
+    curl_easy_setopt(curl, CURLOPT_SSL_VERIFYHOST, 2L);
+    curl_easy_setopt(curl, CURLOPT_USERAGENT, "nostr-core/1.0");
+    
+    // Perform the request
+    CURLcode res = curl_easy_perform(curl);
+    long response_code = 0;
+    curl_easy_getinfo(curl, CURLINFO_RESPONSE_CODE, &response_code);
+    
+    curl_easy_cleanup(curl);
+    
+    if (res != CURLE_OK) {
+        free(response.data);
+        return NOSTR_ERROR_NIP05_HTTP_FAILED;
+    }
+    
+    if (response_code != 200) {
+        free(response.data);
+        return NOSTR_ERROR_NIP05_HTTP_FAILED;
+    }
+    
+    *response_data = response.data;
+    return NOSTR_SUCCESS;
+}
+
+/**
+ * Validate that a hex string is a valid public key
+ */
+static int nip05_validate_pubkey_hex(const char* hex_pubkey) {
+    if (!hex_pubkey) {
+        return NOSTR_ERROR_INVALID_INPUT;
+    }
+    
+    size_t len = strlen(hex_pubkey);
+    if (len != 64) {
+        return NOSTR_ERROR_INVALID_INPUT;
+    }
+    
+    // Check all characters are valid hex
+    for (size_t i = 0; i < len; i++) {
+        char c = hex_pubkey[i];
+        if (!((c >= '0' && c <= '9') || (c >= 'a' && c <= 'f') || (c >= 'A' && c <= 'F'))) {
+            return NOSTR_ERROR_INVALID_INPUT;
+        }
+    }
+    
+    return NOSTR_SUCCESS;
+}
+
+/**
+ * Parse a .well-known/nostr.json response and extract pubkey and relays for a specific name
+ */
+int nostr_nip05_parse_well_known(const char* json_response, const char* local_part,
+                                 char* pubkey_hex_out, char*** relays, int* relay_count) {
+    if (!json_response || !local_part) {
+        return NOSTR_ERROR_INVALID_INPUT;
+    }
+    
+    // Initialize outputs
+    if (pubkey_hex_out) {
+        pubkey_hex_out[0] = '\0';
+    }
+    if (relays) {
+        *relays = NULL;
+    }
+    if (relay_count) {
+        *relay_count = 0;
+    }
+    
+    // Parse JSON
+    cJSON* json = cJSON_Parse(json_response);
+    if (!json) {
+        return NOSTR_ERROR_NIP05_JSON_PARSE_FAILED;
+    }
+    
+    int result = NOSTR_ERROR_NIP05_NAME_NOT_FOUND;
+    
+    // Get the "names" object
+    cJSON* names = cJSON_GetObjectItem(json, "names");
+    if (names && cJSON_IsObject(names)) {
+        cJSON* pubkey_item = cJSON_GetObjectItem(names, local_part);
+        if (pubkey_item && cJSON_IsString(pubkey_item)) {
+            const char* found_pubkey = cJSON_GetStringValue(pubkey_item);
+            
+            // Validate the public key format
+            if (nip05_validate_pubkey_hex(found_pubkey) == NOSTR_SUCCESS) {
+                if (pubkey_hex_out) {
+                    strcpy(pubkey_hex_out, found_pubkey);
+                }
+                result = NOSTR_SUCCESS;
+                
+                // Extract relays if requested
+                if (relays && relay_count) {
+                    cJSON* relays_obj = cJSON_GetObjectItem(json, "relays");
+                    if (relays_obj && cJSON_IsObject(relays_obj)) {
+                        cJSON* user_relays = cJSON_GetObjectItem(relays_obj, found_pubkey);
+                        if (user_relays && cJSON_IsArray(user_relays)) {
+                            int relay_array_size = cJSON_GetArraySize(user_relays);
+                            if (relay_array_size > 0) {
+                                char** relay_array = malloc(relay_array_size * sizeof(char*));
+                                if (relay_array) {
+                                    int valid_relays = 0;
+                                    for (int i = 0; i < relay_array_size; i++) {
+                                        cJSON* relay_item = cJSON_GetArrayItem(user_relays, i);
+                                        if (relay_item && cJSON_IsString(relay_item)) {
+                                            const char* relay_url = cJSON_GetStringValue(relay_item);
+                                            if (relay_url && strlen(relay_url) > 0) {
+                                                relay_array[valid_relays] = malloc(strlen(relay_url) + 1);
+                                                if (relay_array[valid_relays]) {
+                                                    strcpy(relay_array[valid_relays], relay_url);
+                                                    valid_relays++;
+                                                }
+                                            }
+                                        }
+                                    }
+                                    
+                                    if (valid_relays > 0) {
+                                        *relays = relay_array;
+                                        *relay_count = valid_relays;
+                                    } else {
+                                        free(relay_array);
+                                    }
+                                }
+                            }
+                        }
+                    }
+                }
+            }
+        }
+    }
+    
+    cJSON_Delete(json);
+    return result;
+}
+
+/**
+ * Lookup a public key from a NIP-05 identifier
+ */
+int nostr_nip05_lookup(const char* nip05_identifier, char* pubkey_hex_out,
+                       char*** relays, int* relay_count, int timeout_seconds) {
+    if (!nip05_identifier) {
+        return NOSTR_ERROR_INVALID_INPUT;
+    }
+    
+    char local_part[64];
+    char domain[256];
+    char url[NOSTR_MAX_URL_SIZE];
+    
+    // Parse the identifier
+    int parse_result = nip05_parse_identifier(nip05_identifier, local_part, domain);
+    if (parse_result != NOSTR_SUCCESS) {
+        return parse_result;
+    }
+    
+    // Construct the .well-known URL
+    int url_result = snprintf(url, sizeof(url), "https://%s/.well-known/nostr.json?name=%s", 
+                             domain, local_part);
+    if (url_result >= (int)sizeof(url) || url_result < 0) {
+        return NOSTR_ERROR_INVALID_INPUT;
+    }
+    
+    // Make HTTP request
+    char* response_data = NULL;
+    int http_result = nip05_http_get(url, timeout_seconds, &response_data);
+    if (http_result != NOSTR_SUCCESS) {
+        return http_result;
+    }
+    
+    // Parse the response
+    int parse_response_result = nostr_nip05_parse_well_known(response_data, local_part,
+                                                            pubkey_hex_out, relays, relay_count);
+    
+    free(response_data);
+    return parse_response_result;
+}
+
+/**
+ * Verify a NIP-05 identifier against a public key
+ */
+int nostr_nip05_verify(const char* nip05_identifier, const char* pubkey_hex, 
+                       char*** relays, int* relay_count, int timeout_seconds) {
+    if (!nip05_identifier || !pubkey_hex) {
+        return NOSTR_ERROR_INVALID_INPUT;
+    }
+    
+    // Validate the input public key format
+    if (nip05_validate_pubkey_hex(pubkey_hex) != NOSTR_SUCCESS) {
+        return NOSTR_ERROR_INVALID_INPUT;
+    }
+    
+    char found_pubkey[65];
+    
+    // Lookup the public key for this identifier
+    int lookup_result = nostr_nip05_lookup(nip05_identifier, found_pubkey, 
+                                          relays, relay_count, timeout_seconds);
+    if (lookup_result != NOSTR_SUCCESS) {
+        return lookup_result;
+    }
+    
+    // Compare the public keys (case insensitive)
+    if (strcasecmp(pubkey_hex, found_pubkey) != 0) {
+        // Clean up relays if verification failed
+        if (relays && *relays) {
+            for (int i = 0; i < (relay_count ? *relay_count : 0); i++) {
+                free((*relays)[i]);
+            }
+            free(*relays);
+            *relays = NULL;
+        }
+        if (relay_count) {
+            *relay_count = 0;
+        }
+        return NOSTR_ERROR_NIP05_PUBKEY_MISMATCH;
+    }
+    
+    return NOSTR_SUCCESS;
+}
@@ -0,0 +1,18 @@
+/*
+ * NOSTR Core Library - NIP-005: Mapping Nostr keys to DNS-based internet identifiers
+ */
+
+#ifndef NIP005_H
+#define NIP005_H
+
+#include "nip001.h"
+
+// Function declarations
+int nostr_nip05_parse_well_known(const char* json_response, const char* local_part,
+                                 char* pubkey_hex_out, char*** relays, int* relay_count);
+int nostr_nip05_lookup(const char* nip05_identifier, char* pubkey_hex_out,
+                       char*** relays, int* relay_count, int timeout_seconds);
+int nostr_nip05_verify(const char* nip05_identifier, const char* pubkey_hex, 
+                       char*** relays, int* relay_count, int timeout_seconds);
+
+#endif // NIP005_H
@@ -0,0 +1,118 @@
+/*
+ * NOSTR Core Library - NIP-006: Key Derivation from Mnemonic
+ */
+
+#include "nip006.h"
+#include "utils.h"
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <ctype.h>
+#include <time.h>
+#include "../nostr_core/nostr_common.h"
+
+int nostr_generate_keypair(unsigned char* private_key, unsigned char* public_key) {
+    if (!private_key || !public_key) {
+        return NOSTR_ERROR_INVALID_INPUT;
+    }
+    
+    // Generate random entropy using /dev/urandom
+    FILE* urandom = fopen("/dev/urandom", "rb");
+    if (!urandom) {
+        return NOSTR_ERROR_IO_FAILED;
+    }
+    
+    if (fread(private_key, 1, 32, urandom) != 32) {
+        fclose(urandom);
+        return NOSTR_ERROR_IO_FAILED;
+    }
+    fclose(urandom);
+    
+    // Validate private key
+    if (nostr_ec_private_key_verify(private_key) != 0) {
+        return NOSTR_ERROR_CRYPTO_FAILED;
+    }
+    
+    // Generate public key from private key (already x-only for NOSTR)
+    if (nostr_ec_public_key_from_private_key(private_key, public_key) != 0) {
+        return NOSTR_ERROR_CRYPTO_FAILED;
+    }
+    
+    return NOSTR_SUCCESS;
+}
+
+int nostr_generate_mnemonic_and_keys(char* mnemonic, size_t mnemonic_size, 
+                                    int account, unsigned char* private_key, 
+                                    unsigned char* public_key) {
+    if (!mnemonic || mnemonic_size < 256 || !private_key || !public_key) {
+        return NOSTR_ERROR_INVALID_INPUT;
+    }
+    
+    // Generate entropy for 12-word mnemonic
+    unsigned char entropy[16];
+    FILE* urandom = fopen("/dev/urandom", "rb");
+    if (!urandom) {
+        return NOSTR_ERROR_IO_FAILED;
+    }
+    
+    if (fread(entropy, 1, sizeof(entropy), urandom) != sizeof(entropy)) {
+        fclose(urandom);
+        return NOSTR_ERROR_IO_FAILED;
+    }
+    fclose(urandom);
+    
+    // Generate mnemonic from entropy
+    if (nostr_bip39_mnemonic_from_bytes(entropy, sizeof(entropy), mnemonic) != 0) {
+        return NOSTR_ERROR_CRYPTO_FAILED;
+    }
+    
+    // Derive keys from the generated mnemonic
+    return nostr_derive_keys_from_mnemonic(mnemonic, account, private_key, public_key);
+}
+
+int nostr_derive_keys_from_mnemonic(const char* mnemonic, int account,
+                                   unsigned char* private_key, unsigned char* public_key) {
+    if (!mnemonic || !private_key || !public_key) {
+        return NOSTR_ERROR_INVALID_INPUT;
+    }
+    
+    // Validate mnemonic
+    if (nostr_bip39_mnemonic_validate(mnemonic) != 0) {
+        return NOSTR_ERROR_INVALID_INPUT;
+    }
+    
+    // Convert mnemonic to seed
+    unsigned char seed[64];
+    if (nostr_bip39_mnemonic_to_seed(mnemonic, "", seed, sizeof(seed)) != 0) {
+        return NOSTR_ERROR_CRYPTO_FAILED;
+    }
+    
+    // Derive master key from seed
+    nostr_hd_key_t master_key;
+    if (nostr_bip32_key_from_seed(seed, sizeof(seed), &master_key) != 0) {
+        return NOSTR_ERROR_CRYPTO_FAILED;
+    }
+    
+    // NIP-06 path: m/44'/1237'/account'/0/0
+    nostr_hd_key_t derived_key;
+    uint32_t path[] = {
+        0x80000000 + 44,    // 44' (hardened)
+        0x80000000 + 1237,  // 1237' (hardened)
+        0x80000000 + account, // account' (hardened)
+        0,                   // 0 (not hardened)
+        0                    // 0 (not hardened)
+    };
+    
+    if (nostr_bip32_derive_path(&master_key, path, sizeof(path) / sizeof(path[0]), &derived_key) != 0) {
+        return NOSTR_ERROR_CRYPTO_FAILED;
+    }
+    
+    // Extract private key and public key
+    memcpy(private_key, derived_key.private_key, 32);
+    memcpy(public_key, derived_key.public_key + 1, 32); // Remove compression prefix for x-only
+    
+    return NOSTR_SUCCESS;
+}
+
+// Note: nostr_detect_input_type, nostr_decode_nsec, and nostr_decode_npub
+// are implemented in NIP-019 to avoid multiple definitions
@@ -0,0 +1,30 @@
+/*
+ * NOSTR Core Library - NIP-006: Key Derivation from Mnemonic
+ */
+
+#ifndef NIP006_H
+#define NIP006_H
+
+#include "nip001.h"
+#include <stdint.h>
+
+// Input type detection
+typedef enum {
+    NOSTR_INPUT_UNKNOWN = 0,
+    NOSTR_INPUT_NSEC_HEX,
+    NOSTR_INPUT_NSEC_BECH32,
+    NOSTR_INPUT_MNEMONIC
+} nostr_input_type_t;
+
+// Function declarations
+int nostr_generate_keypair(unsigned char* private_key, unsigned char* public_key);
+int nostr_generate_mnemonic_and_keys(char* mnemonic, size_t mnemonic_size, 
+                                    int account, unsigned char* private_key, 
+                                    unsigned char* public_key);
+int nostr_derive_keys_from_mnemonic(const char* mnemonic, int account,
+                                   unsigned char* private_key, unsigned char* public_key);
+nostr_input_type_t nostr_detect_input_type(const char* input);
+int nostr_decode_nsec(const char* input, unsigned char* private_key);
+int nostr_decode_npub(const char* input, unsigned char* public_key);
+
+#endif // NIP006_H
@@ -0,0 +1,473 @@
+/*
+ * NOSTR Core Library - NIP-011: Relay Information Document
+ */
+
+#include "nip011.h"
+#include "../cjson/cJSON.h"
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include "../nostr_core/nostr_common.h"
+
+#ifndef DISABLE_NIP05 // NIP-11 uses the same HTTP infrastructure as NIP-05
+
+#include <curl/curl.h>
+
+// Maximum sizes for NIP-11 operations
+#define NIP11_MAX_URL_SIZE 512
+#define NIP11_MAX_RESPONSE_SIZE 16384
+#define NIP11_DEFAULT_TIMEOUT 10
+
+// Structure for HTTP response handling (same as NIP-05)
+typedef struct {
+    char* data;
+    size_t size;
+    size_t capacity;
+} nip11_http_response_t;
+
+/**
+ * Callback function for curl to write HTTP response data
+ */
+static size_t nip11_write_callback(void* contents, size_t size, size_t nmemb, nip11_http_response_t* response) {
+    size_t total_size = size * nmemb;
+    
+    // Check if we need to expand the buffer
+    if (response->size + total_size >= response->capacity) {
+        size_t new_capacity = response->capacity * 2;
+        if (new_capacity < response->size + total_size + 1) {
+            new_capacity = response->size + total_size + 1;
+        }
+        
+        char* new_data = realloc(response->data, new_capacity);
+        if (!new_data) {
+            return 0; // Out of memory
+        }
+        
+        response->data = new_data;
+        response->capacity = new_capacity;
+    }
+    
+    // Append the new data
+    memcpy(response->data + response->size, contents, total_size);
+    response->size += total_size;
+    response->data[response->size] = '\0';
+    
+    return total_size;
+}
+
+/**
+ * Convert WebSocket URL to HTTP URL for NIP-11 document retrieval
+ */
+static char* nip11_ws_to_http_url(const char* ws_url) {
+    if (!ws_url) {
+        return NULL;
+    }
+    
+    size_t url_len = strlen(ws_url);
+    char* http_url = malloc(url_len + 10); // Extra space for protocol change
+    if (!http_url) {
+        return NULL;
+    }
+    
+    // Convert ws:// to http:// and wss:// to https://
+    if (strncmp(ws_url, "ws://", 5) == 0) {
+        sprintf(http_url, "http://%s", ws_url + 5);
+    } else if (strncmp(ws_url, "wss://", 6) == 0) {
+        sprintf(http_url, "https://%s", ws_url + 6);
+    } else {
+        // Assume it's already HTTP(S) or add https:// as default
+        if (strncmp(ws_url, "http://", 7) == 0 || strncmp(ws_url, "https://", 8) == 0) {
+            strcpy(http_url, ws_url);
+        } else {
+            sprintf(http_url, "https://%s", ws_url);
+        }
+    }
+    
+    return http_url;
+}
+
+/**
+ * Parse supported NIPs array from JSON
+ */
+static int nip11_parse_supported_nips(cJSON* nips_array, int** nips_out, size_t* count_out) {
+    if (!nips_array || !cJSON_IsArray(nips_array)) {
+        *nips_out = NULL;
+        *count_out = 0;
+        return NOSTR_SUCCESS;
+    }
+    
+    int array_size = cJSON_GetArraySize(nips_array);
+    if (array_size == 0) {
+        *nips_out = NULL;
+        *count_out = 0;
+        return NOSTR_SUCCESS;
+    }
+    
+    int* nips = malloc(array_size * sizeof(int));
+    if (!nips) {
+        return NOSTR_ERROR_MEMORY_FAILED;
+    }
+    
+    int valid_count = 0;
+    for (int i = 0; i < array_size; i++) {
+        cJSON* nip_item = cJSON_GetArrayItem(nips_array, i);
+        if (nip_item && cJSON_IsNumber(nip_item)) {
+            nips[valid_count++] = (int)cJSON_GetNumberValue(nip_item);
+        }
+    }
+    
+    if (valid_count == 0) {
+        free(nips);
+        *nips_out = NULL;
+        *count_out = 0;
+    } else {
+        *nips_out = nips;
+        *count_out = valid_count;
+    }
+    
+    return NOSTR_SUCCESS;
+}
+
+/**
+ * Parse string array from JSON
+ */
+static int nip11_parse_string_array(cJSON* json_array, char*** strings_out, size_t* count_out) {
+    if (!json_array || !cJSON_IsArray(json_array)) {
+        *strings_out = NULL;
+        *count_out = 0;
+        return NOSTR_SUCCESS;
+    }
+    
+    int array_size = cJSON_GetArraySize(json_array);
+    if (array_size == 0) {
+        *strings_out = NULL;
+        *count_out = 0;
+        return NOSTR_SUCCESS;
+    }
+    
+    char** strings = malloc(array_size * sizeof(char*));
+    if (!strings) {
+        return NOSTR_ERROR_MEMORY_FAILED;
+    }
+    
+    int valid_count = 0;
+    for (int i = 0; i < array_size; i++) {
+        cJSON* string_item = cJSON_GetArrayItem(json_array, i);
+        if (string_item && cJSON_IsString(string_item)) {
+            const char* str_value = cJSON_GetStringValue(string_item);
+            if (str_value && strlen(str_value) > 0) {
+                strings[valid_count] = malloc(strlen(str_value) + 1);
+                if (strings[valid_count]) {
+                    strcpy(strings[valid_count], str_value);
+                    valid_count++;
+                }
+            }
+        }
+    }
+    
+    if (valid_count == 0) {
+        free(strings);
+        *strings_out = NULL;
+        *count_out = 0;
+    } else {
+        *strings_out = strings;
+        *count_out = valid_count;
+    }
+    
+    return NOSTR_SUCCESS;
+}
+
+/**
+ * Helper to safely copy JSON string value
+ */
+static char* nip11_copy_json_string(cJSON* json_item) {
+    if (!json_item || !cJSON_IsString(json_item)) {
+        return NULL;
+    }
+    
+    const char* str_value = cJSON_GetStringValue(json_item);
+    if (!str_value) {
+        return NULL;
+    }
+    
+    char* copy = malloc(strlen(str_value) + 1);
+    if (copy) {
+        strcpy(copy, str_value);
+    }
+    
+    return copy;
+}
+
+/**
+ * Parse NIP-11 relay information document from JSON
+ */
+static int nip11_parse_relay_info(const char* json_response, nostr_relay_info_t* info) {
+    if (!json_response || !info) {
+        return NOSTR_ERROR_INVALID_INPUT;
+    }
+    
+    // Initialize structure
+    memset(info, 0, sizeof(nostr_relay_info_t));
+    
+    // Parse JSON
+    cJSON* json = cJSON_Parse(json_response);
+    if (!json) {
+        return NOSTR_ERROR_NIP05_JSON_PARSE_FAILED;
+    }
+    
+    // Parse basic information
+    info->basic.name = nip11_copy_json_string(cJSON_GetObjectItem(json, "name"));
+    info->basic.description = nip11_copy_json_string(cJSON_GetObjectItem(json, "description"));
+    info->basic.pubkey = nip11_copy_json_string(cJSON_GetObjectItem(json, "pubkey"));
+    info->basic.contact = nip11_copy_json_string(cJSON_GetObjectItem(json, "contact"));
+    info->basic.software = nip11_copy_json_string(cJSON_GetObjectItem(json, "software"));
+    info->basic.version = nip11_copy_json_string(cJSON_GetObjectItem(json, "version"));
+    
+    // Parse supported NIPs
+    cJSON* supported_nips = cJSON_GetObjectItem(json, "supported_nips");
+    nip11_parse_supported_nips(supported_nips, &info->basic.supported_nips, &info->basic.supported_nips_count);
+    
+    // Parse limitations (if present)
+    cJSON* limitation = cJSON_GetObjectItem(json, "limitation");
+    if (limitation && cJSON_IsObject(limitation)) {
+        info->has_limitations = 1;
+        
+        cJSON* item;
+        item = cJSON_GetObjectItem(limitation, "max_message_length");
+        info->limitations.max_message_length = (item && cJSON_IsNumber(item)) ? (int)cJSON_GetNumberValue(item) : -1;
+        
+        item = cJSON_GetObjectItem(limitation, "max_subscriptions");
+        info->limitations.max_subscriptions = (item && cJSON_IsNumber(item)) ? (int)cJSON_GetNumberValue(item) : -1;
+        
+        item = cJSON_GetObjectItem(limitation, "max_filters");
+        info->limitations.max_filters = (item && cJSON_IsNumber(item)) ? (int)cJSON_GetNumberValue(item) : -1;
+        
+        item = cJSON_GetObjectItem(limitation, "max_limit");
+        info->limitations.max_limit = (item && cJSON_IsNumber(item)) ? (int)cJSON_GetNumberValue(item) : -1;
+        
+        item = cJSON_GetObjectItem(limitation, "max_subid_length");
+        info->limitations.max_subid_length = (item && cJSON_IsNumber(item)) ? (int)cJSON_GetNumberValue(item) : -1;
+        
+        item = cJSON_GetObjectItem(limitation, "min_prefix");
+        info->limitations.min_prefix = (item && cJSON_IsNumber(item)) ? (int)cJSON_GetNumberValue(item) : -1;
+        
+        item = cJSON_GetObjectItem(limitation, "max_event_tags");
+        info->limitations.max_event_tags = (item && cJSON_IsNumber(item)) ? (int)cJSON_GetNumberValue(item) : -1;
+        
+        item = cJSON_GetObjectItem(limitation, "max_content_length");
+        info->limitations.max_content_length = (item && cJSON_IsNumber(item)) ? (int)cJSON_GetNumberValue(item) : -1;
+        
+        item = cJSON_GetObjectItem(limitation, "min_pow_difficulty");
+        info->limitations.min_pow_difficulty = (item && cJSON_IsNumber(item)) ? (int)cJSON_GetNumberValue(item) : -1;
+        
+        item = cJSON_GetObjectItem(limitation, "auth_required");
+        info->limitations.auth_required = (item && cJSON_IsBool(item)) ? (cJSON_IsTrue(item) ? 1 : 0) : -1;
+        
+        item = cJSON_GetObjectItem(limitation, "payment_required");
+        info->limitations.payment_required = (item && cJSON_IsBool(item)) ? (cJSON_IsTrue(item) ? 1 : 0) : -1;
+        
+        item = cJSON_GetObjectItem(limitation, "restricted_writes");
+        info->limitations.restricted_writes = (item && cJSON_IsBool(item)) ? (cJSON_IsTrue(item) ? 1 : 0) : -1;
+        
+        item = cJSON_GetObjectItem(limitation, "created_at_lower_limit");
+        info->limitations.created_at_lower_limit = (item && cJSON_IsNumber(item)) ? (long)cJSON_GetNumberValue(item) : -1;
+        
+        item = cJSON_GetObjectItem(limitation, "created_at_upper_limit");
+        info->limitations.created_at_upper_limit = (item && cJSON_IsNumber(item)) ? (long)cJSON_GetNumberValue(item) : -1;
+    }
+    
+    // Parse relay countries
+    cJSON* relay_countries = cJSON_GetObjectItem(json, "relay_countries");
+    if (relay_countries && cJSON_IsArray(relay_countries)) {
+        info->has_content_limitations = 1;
+        nip11_parse_string_array(relay_countries, &info->content_limitations.relay_countries, 
+                                &info->content_limitations.relay_countries_count);
+    }
+    
+    // Parse community preferences
+    cJSON* language_tags = cJSON_GetObjectItem(json, "language_tags");
+    cJSON* tags = cJSON_GetObjectItem(json, "tags");
+    cJSON* posting_policy = cJSON_GetObjectItem(json, "posting_policy");
+    
+    if ((language_tags && cJSON_IsArray(language_tags)) || 
+        (tags && cJSON_IsArray(tags)) || 
+        (posting_policy && cJSON_IsString(posting_policy))) {
+        info->has_community_preferences = 1;
+        
+        if (language_tags) {
+            nip11_parse_string_array(language_tags, &info->community_preferences.language_tags, 
+                                    &info->community_preferences.language_tags_count);
+        }
+        
+        if (tags) {
+            nip11_parse_string_array(tags, &info->community_preferences.tags, 
+                                    &info->community_preferences.tags_count);
+        }
+        
+        if (posting_policy) {
+            info->community_preferences.posting_policy = nip11_copy_json_string(posting_policy);
+        }
+    }
+    
+    // Parse icon
+    cJSON* icon = cJSON_GetObjectItem(json, "icon");
+    if (icon && cJSON_IsString(icon)) {
+        info->has_icon = 1;
+        info->icon.icon = nip11_copy_json_string(icon);
+    }
+    
+    cJSON_Delete(json);
+    return NOSTR_SUCCESS;
+}
+
+/**
+ * Fetch relay information document from a relay URL
+ */
+int nostr_nip11_fetch_relay_info(const char* relay_url, nostr_relay_info_t** info_out, int timeout_seconds) {
+    if (!relay_url || !info_out) {
+        return NOSTR_ERROR_INVALID_INPUT;
+    }
+    
+    // Convert WebSocket URL to HTTP URL
+    char* http_url = nip11_ws_to_http_url(relay_url);
+    if (!http_url) {
+        return NOSTR_ERROR_MEMORY_FAILED;
+    }
+    
+    // Allocate info structure
+    nostr_relay_info_t* info = malloc(sizeof(nostr_relay_info_t));
+    if (!info) {
+        free(http_url);
+        return NOSTR_ERROR_MEMORY_FAILED;
+    }
+    
+    // Make HTTP request with NIP-11 required header
+    CURL* curl = curl_easy_init();
+    if (!curl) {
+        free(http_url);
+        free(info);
+        return NOSTR_ERROR_NETWORK_FAILED;
+    }
+    
+    // Use the HTTP response structure
+    nip11_http_response_t response = {0};
+    response.capacity = 1024;
+    response.data = malloc(response.capacity);
+    if (!response.data) {
+        curl_easy_cleanup(curl);
+        free(http_url);
+        free(info);
+        return NOSTR_ERROR_MEMORY_FAILED;
+    }
+    response.data[0] = '\0';
+    
+    // Set up headers for NIP-11
+    struct curl_slist* headers = NULL;
+    headers = curl_slist_append(headers, "Accept: application/nostr+json");
+    
+    // Set curl options - use proper function pointer cast
+    curl_easy_setopt(curl, CURLOPT_URL, http_url);
+    curl_easy_setopt(curl, CURLOPT_HTTPHEADER, headers);
+    curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, (curl_write_callback)nip11_write_callback);
+    curl_easy_setopt(curl, CURLOPT_WRITEDATA, &response);
+    curl_easy_setopt(curl, CURLOPT_TIMEOUT, (long)(timeout_seconds > 0 ? timeout_seconds : NIP11_DEFAULT_TIMEOUT));
+    curl_easy_setopt(curl, CURLOPT_FOLLOWLOCATION, 1L); // NIP-11 allows redirects
+    curl_easy_setopt(curl, CURLOPT_MAXREDIRS, 3L);
+    curl_easy_setopt(curl, CURLOPT_SSL_VERIFYPEER, 1L);
+    curl_easy_setopt(curl, CURLOPT_SSL_VERIFYHOST, 2L);
+    curl_easy_setopt(curl, CURLOPT_USERAGENT, "nostr-core/1.0");
+    
+    // Perform the request
+    CURLcode res = curl_easy_perform(curl);
+    long response_code = 0;
+    curl_easy_getinfo(curl, CURLINFO_RESPONSE_CODE, &response_code);
+    
+    curl_slist_free_all(headers);
+    curl_easy_cleanup(curl);
+    free(http_url);
+    
+    if (res != CURLE_OK || response_code != 200) {
+        free(response.data);
+        free(info);
+        return NOSTR_ERROR_NIP05_HTTP_FAILED;
+    }
+    
+    // Parse the relay information
+    int parse_result = nip11_parse_relay_info(response.data, info);
+    free(response.data);
+    
+    if (parse_result != NOSTR_SUCCESS) {
+        nostr_nip11_relay_info_free(info);
+        return parse_result;
+    }
+    
+    *info_out = info;
+    return NOSTR_SUCCESS;
+}
+
+/**
+ * Free relay information structure
+ */
+void nostr_nip11_relay_info_free(nostr_relay_info_t* info) {
+    if (!info) {
+        return;
+    }
+    
+    // Free basic info strings
+    free(info->basic.name);
+    free(info->basic.description);
+    free(info->basic.pubkey);
+    free(info->basic.contact);
+    free(info->basic.software);
+    free(info->basic.version);
+    free(info->basic.supported_nips);
+    
+    // Free content limitations
+    if (info->has_content_limitations) {
+        for (size_t i = 0; i < info->content_limitations.relay_countries_count; i++) {
+            free(info->content_limitations.relay_countries[i]);
+        }
+        free(info->content_limitations.relay_countries);
+    }
+    
+    // Free community preferences
+    if (info->has_community_preferences) {
+        for (size_t i = 0; i < info->community_preferences.language_tags_count; i++) {
+            free(info->community_preferences.language_tags[i]);
+        }
+        free(info->community_preferences.language_tags);
+        
+        for (size_t i = 0; i < info->community_preferences.tags_count; i++) {
+            free(info->community_preferences.tags[i]);
+        }
+        free(info->community_preferences.tags);
+        
+        free(info->community_preferences.posting_policy);
+    }
+    
+    // Free icon
+    if (info->has_icon) {
+        free(info->icon.icon);
+    }
+    
+    free(info);
+}
+
+#else // DISABLE_NIP05
+
+/**
+ * Stub implementations when NIP-05 is disabled at compile time
+ */
+int nostr_nip11_fetch_relay_info(const char* relay_url, nostr_relay_info_t** info_out, int timeout_seconds) {
+    (void)relay_url;
+    (void)info_out;
+    (void)timeout_seconds;
+    return NOSTR_ERROR_NETWORK_FAILED; // NIP-11 disabled at compile time
+}
+
+void nostr_nip11_relay_info_free(nostr_relay_info_t* info) {
+    (void)info;
+    // No-op when disabled
+}
+
+#endif // DISABLE_NIP05
@@ -0,0 +1,84 @@
+/*
+ * NOSTR Core Library - NIP-011: Relay Information Document
+ */
+
+#ifndef NIP011_H
+#define NIP011_H
+
+#include "nip001.h"
+#include <stddef.h>
+
+// NIP-11 Relay Information structures
+
+// Basic relay information
+typedef struct {
+    char* name;
+    char* description;
+    char* pubkey;
+    char* contact;
+    char* software;
+    char* version;
+    int* supported_nips;
+    size_t supported_nips_count;
+} nostr_relay_basic_info_t;
+
+// Relay limitations
+typedef struct {
+    int max_message_length;
+    int max_subscriptions;
+    int max_filters;
+    int max_limit;
+    int max_subid_length;
+    int min_prefix;
+    int max_event_tags;
+    int max_content_length;
+    int min_pow_difficulty;
+    int auth_required;        // -1 = not specified, 0 = false, 1 = true
+    int payment_required;     // -1 = not specified, 0 = false, 1 = true
+    int restricted_writes;    // -1 = not specified, 0 = false, 1 = true
+    long created_at_lower_limit;
+    long created_at_upper_limit;
+} nostr_relay_limitations_t;
+
+// Content limitations
+typedef struct {
+    char** relay_countries;
+    size_t relay_countries_count;
+} nostr_relay_content_limitations_t;
+
+// Community preferences
+typedef struct {
+    char** language_tags;
+    size_t language_tags_count;
+    char** tags;
+    size_t tags_count;
+    char* posting_policy;
+} nostr_relay_community_preferences_t;
+
+// Icon information
+typedef struct {
+    char* icon;
+} nostr_relay_icon_t;
+
+// Complete relay information structure
+typedef struct {
+    nostr_relay_basic_info_t basic;
+    
+    int has_limitations;
+    nostr_relay_limitations_t limitations;
+    
+    int has_content_limitations;
+    nostr_relay_content_limitations_t content_limitations;
+    
+    int has_community_preferences;
+    nostr_relay_community_preferences_t community_preferences;
+    
+    int has_icon;
+    nostr_relay_icon_t icon;
+} nostr_relay_info_t;
+
+// Function declarations
+int nostr_nip11_fetch_relay_info(const char* relay_url, nostr_relay_info_t** info_out, int timeout_seconds);
+void nostr_nip11_relay_info_free(nostr_relay_info_t* info);
+
+#endif // NIP011_H
@@ -0,0 +1,613 @@
+/*
+ * NOSTR Core Library - NIP-013: Proof of Work
+ */
+
+#include "nip013.h"
+#include "nip001.h"
+#include "utils.h"
+#include "../cjson/cJSON.h"
+#include "nostr_log.h"
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <time.h>
+#include <stdint.h>
+#include "../nostr_core/nostr_common.h"
+
+/**
+ * Count leading zero bits in a hash (NIP-13 reference implementation)
+ */
+static int zero_bits(unsigned char b) {
+    int n = 0;
+    
+    if (b == 0)
+        return 8;
+    
+    while (b >>= 1)
+        n++;
+    
+    return 7-n;
+}
+
+/**
+ * Find the number of leading zero bits in a hash (NIP-13 reference implementation)
+ */
+static int count_leading_zero_bits(unsigned char *hash) {
+    int bits, total, i;
+    for (i = 0, total = 0; i < 32; i++) {
+        bits = zero_bits(hash[i]);
+        total += bits;
+        if (bits != 8)
+            break;
+    }
+    return total;
+}
+
+/**
+ * Add or update nonce tag with target difficulty
+ */
+static int update_nonce_tag_with_difficulty(cJSON* tags, uint64_t nonce, int target_difficulty) {
+    if (!tags) return -1;
+    
+    // Look for existing nonce tag and remove it
+    cJSON* tag = NULL;
+    int index = 0;
+    cJSON_ArrayForEach(tag, tags) {
+        if (cJSON_IsArray(tag) && cJSON_GetArraySize(tag) >= 2) {
+            cJSON* tag_type = cJSON_GetArrayItem(tag, 0);
+            if (tag_type && cJSON_IsString(tag_type) && 
+                strcmp(cJSON_GetStringValue(tag_type), "nonce") == 0) {
+                // Remove existing nonce tag
+                cJSON_DetachItemFromArray(tags, index);
+                cJSON_Delete(tag);
+                break;
+            }
+        }
+        index++;
+    }
+    
+    // Add new nonce tag with format: ["nonce", "<nonce>", "<target_difficulty>"]
+    cJSON* nonce_tag = cJSON_CreateArray();
+    if (!nonce_tag) return -1;
+    
+    char nonce_str[32];
+    char difficulty_str[16];
+    snprintf(nonce_str, sizeof(nonce_str), "%llu", (unsigned long long)nonce);
+    snprintf(difficulty_str, sizeof(difficulty_str), "%d", target_difficulty);
+    
+    cJSON_AddItemToArray(nonce_tag, cJSON_CreateString("nonce"));
+    cJSON_AddItemToArray(nonce_tag, cJSON_CreateString(nonce_str));
+    cJSON_AddItemToArray(nonce_tag, cJSON_CreateString(difficulty_str));
+    
+    cJSON_AddItemToArray(tags, nonce_tag);
+    return 0;
+}
+
+/**
+ * Helper function to replace event content with successful PoW result
+ */
+static void replace_event_content(cJSON* target_event, cJSON* source_event) {
+    // Remove old fields
+    cJSON_DeleteItemFromObject(target_event, "id");
+    cJSON_DeleteItemFromObject(target_event, "sig");
+    cJSON_DeleteItemFromObject(target_event, "tags");
+    cJSON_DeleteItemFromObject(target_event, "created_at");
+    
+    // Copy new fields from successful event
+    cJSON* id = cJSON_GetObjectItem(source_event, "id");
+    cJSON* sig = cJSON_GetObjectItem(source_event, "sig");
+    cJSON* tags = cJSON_GetObjectItem(source_event, "tags");
+    cJSON* created_at = cJSON_GetObjectItem(source_event, "created_at");
+    
+    if (id) cJSON_AddItemToObject(target_event, "id", cJSON_Duplicate(id, 1));
+    if (sig) cJSON_AddItemToObject(target_event, "sig", cJSON_Duplicate(sig, 1));
+    if (tags) cJSON_AddItemToObject(target_event, "tags", cJSON_Duplicate(tags, 1));
+    if (created_at) cJSON_AddItemToObject(target_event, "created_at", cJSON_Duplicate(created_at, 1));
+}
+
+/**
+ * Add NIP-13 Proof of Work to an event
+ * 
+ * @param event The event to add proof of work to
+ * @param private_key The private key for re-signing the event
+ * @param target_difficulty Target number of leading zero bits (default: 4 if 0)
+ * @param max_attempts Maximum number of mining attempts (default: 10,000,000 if <= 0)
+ * @param progress_report_interval How often to call progress callback (default: 10,000 if <= 0)
+ * @param timestamp_update_interval How often to update timestamp (default: 10,000 if <= 0)
+ * @param progress_callback Optional callback for mining progress
+ * @param user_data User data for progress callback
+ * @return NOSTR_SUCCESS on success, error code on failure
+ */
+int nostr_add_proof_of_work(cJSON* event, const unsigned char* private_key, 
+                           int target_difficulty, int max_attempts,
+                           int progress_report_interval, int timestamp_update_interval,
+                           void (*progress_callback)(int current_difficulty, uint64_t nonce, void* user_data),
+                           void* user_data) {
+    if (!event || !private_key) {
+        return NOSTR_ERROR_INVALID_INPUT;
+    }
+    
+    // Set default difficulty if not specified (but allow 0 to disable PoW)
+    if (target_difficulty < 0) {
+        target_difficulty = 4;
+    }
+    
+    // If target_difficulty is 0, skip proof of work entirely
+    if (target_difficulty == 0) {
+        return NOSTR_SUCCESS;
+    }
+    
+    // Set default values for parameters
+    if (max_attempts <= 0) {
+        max_attempts = 10000000;  // 10 million default
+    }
+    if (progress_report_interval <= 0) {
+        progress_report_interval = 10000;  // Every 10,000 attempts
+    }
+    if (timestamp_update_interval <= 0) {
+        timestamp_update_interval = 10000;  // Every 10,000 attempts
+    }
+    
+    // Extract event data for reconstruction
+    cJSON* kind_item = cJSON_GetObjectItem(event, "kind");
+    cJSON* content_item = cJSON_GetObjectItem(event, "content");
+    cJSON* created_at_item = cJSON_GetObjectItem(event, "created_at");
+    cJSON* tags_item = cJSON_GetObjectItem(event, "tags");
+    
+    if (!kind_item || !content_item || !created_at_item || !tags_item) {
+        return NOSTR_ERROR_INVALID_INPUT;
+    }
+    
+    int kind = (int)cJSON_GetNumberValue(kind_item);
+    const char* content = cJSON_GetStringValue(content_item);
+    time_t original_timestamp = (time_t)cJSON_GetNumberValue(created_at_item);
+    
+    uint64_t nonce = 0;
+    int attempts = 0;
+    time_t current_timestamp = original_timestamp;
+    
+    // PoW difficulty tracking variables
+    int best_difficulty_this_round = 0;
+    int best_difficulty_overall = 0;
+    
+    // Mining loop
+    while (attempts < max_attempts) {
+        // Update timestamp based on timestamp_update_interval
+        if (attempts % timestamp_update_interval == 0) {
+            current_timestamp = time(NULL);
+#ifdef ENABLE_DEBUG_LOGGING
+            nostr_log_emitf(NOSTR_LOG_LEVEL_DEBUG,
+                            "nip013",
+                            "PoW mining: %d attempts, best this round: %d, overall best: %d, goal: %d",
+                            attempts,
+                            best_difficulty_this_round,
+                            best_difficulty_overall,
+                            target_difficulty);
+#endif
+            // Reset best difficulty for the new round
+            best_difficulty_this_round = 0;
+        }
+        
+        // Call progress callback at specified intervals
+        if (progress_callback && (attempts % progress_report_interval == 0)) {
+            progress_callback(best_difficulty_overall, nonce, user_data);
+        }
+        
+        // Create working copy of tags and add nonce
+        cJSON* working_tags = cJSON_Duplicate(tags_item, 1);
+        if (!working_tags) {
+            return NOSTR_ERROR_MEMORY_FAILED;
+        }
+        
+        if (update_nonce_tag_with_difficulty(working_tags, nonce, target_difficulty) != 0) {
+            cJSON_Delete(working_tags);
+            return NOSTR_ERROR_CRYPTO_FAILED;
+        }
+        
+        // Create and sign new event with current nonce
+        cJSON* test_event = nostr_create_and_sign_event(kind, content, working_tags, 
+                                                       private_key, current_timestamp);
+        cJSON_Delete(working_tags);
+        
+        if (!test_event) {
+            return NOSTR_ERROR_CRYPTO_FAILED;
+        }
+        
+        // Check PoW difficulty
+        cJSON* id_item = cJSON_GetObjectItem(test_event, "id");
+        if (!id_item || !cJSON_IsString(id_item)) {
+            cJSON_Delete(test_event);
+            return NOSTR_ERROR_CRYPTO_FAILED;
+        }
+        
+        const char* event_id = cJSON_GetStringValue(id_item);
+        unsigned char hash[32];
+        if (nostr_hex_to_bytes(event_id, hash, 32) != NOSTR_SUCCESS) {
+            cJSON_Delete(test_event);
+            return NOSTR_ERROR_CRYPTO_FAILED;
+        }
+        
+        // Count leading zero bits using NIP-13 method
+        int current_difficulty = count_leading_zero_bits(hash);
+        
+        // Update difficulty tracking
+        if (current_difficulty > best_difficulty_this_round) {
+            best_difficulty_this_round = current_difficulty;
+        }
+        if (current_difficulty > best_difficulty_overall) {
+            best_difficulty_overall = current_difficulty;
+        }
+        
+        // Check if we've reached the target
+        if (current_difficulty >= target_difficulty) {
+#ifdef ENABLE_DEBUG_LOGGING
+            nostr_log_emitf(NOSTR_LOG_LEVEL_INFO,
+                            "nip013",
+                            "PoW SUCCESS: Found difficulty %d (target %d) at nonce %llu after %d attempts",
+                            current_difficulty,
+                            target_difficulty,
+                            (unsigned long long)nonce,
+                            attempts + 1);
+
+            // Print the final event JSON
+            char* event_json = cJSON_Print(test_event);
+            if (event_json) {
+                nostr_log_emitf(NOSTR_LOG_LEVEL_DEBUG,
+                                "nip013",
+                                "Final event: %s",
+                                event_json);
+                free(event_json);
+            }
+#endif
+            
+            // Copy successful result back to input event
+            replace_event_content(event, test_event);
+            cJSON_Delete(test_event);
+            return NOSTR_SUCCESS;
+        }
+        
+        cJSON_Delete(test_event);
+        nonce++;
+        attempts++;
+    }
+    
+#ifdef ENABLE_DEBUG_LOGGING
+    // Debug logging - failure
+    nostr_log_emitf(NOSTR_LOG_LEVEL_WARN,
+                    "nip013",
+                    "PoW FAILED: Mining failed after %d attempts",
+                    max_attempts);
+#endif
+    
+    // If we reach here, we've exceeded max attempts
+    return NOSTR_ERROR_CRYPTO_FAILED;
+}
+
+/**
+ * Calculate PoW difficulty (leading zero bits) for an event ID
+ *
+ * @param event_id_hex Hexadecimal event ID string (64 characters)
+ * @return Number of leading zero bits, or negative error code on failure
+ */
+int nostr_calculate_pow_difficulty(const char* event_id_hex) {
+    if (!event_id_hex) {
+        return NOSTR_ERROR_INVALID_INPUT;
+    }
+    
+    // Validate hex string length (should be 64 characters for SHA-256)
+    size_t hex_len = strlen(event_id_hex);
+    if (hex_len != 64) {
+        return NOSTR_ERROR_NIP13_CALCULATION;
+    }
+    
+    // Convert hex to bytes
+    unsigned char hash[32];
+    if (nostr_hex_to_bytes(event_id_hex, hash, 32) != NOSTR_SUCCESS) {
+        return NOSTR_ERROR_NIP13_CALCULATION;
+    }
+    
+    // Use existing NIP-13 reference implementation
+    return count_leading_zero_bits(hash);
+}
+
+/**
+ * Extract nonce information from event tags
+ *
+ * @param event Complete event JSON object
+ * @param nonce_out Output pointer for nonce value (can be NULL)
+ * @param target_difficulty_out Output pointer for target difficulty (can be NULL)
+ * @return NOSTR_SUCCESS if nonce tag found, NOSTR_ERROR_NIP13_NO_NONCE_TAG if not found, other error codes on failure
+ */
+int nostr_extract_nonce_info(cJSON* event, uint64_t* nonce_out, int* target_difficulty_out) {
+    if (!event) {
+        return NOSTR_ERROR_INVALID_INPUT;
+    }
+    
+    // Initialize output values
+    if (nonce_out) *nonce_out = 0;
+    if (target_difficulty_out) *target_difficulty_out = -1;
+    
+    // Get tags array
+    cJSON* tags = cJSON_GetObjectItem(event, "tags");
+    if (!tags || !cJSON_IsArray(tags)) {
+        return NOSTR_ERROR_NIP13_NO_NONCE_TAG;
+    }
+    
+    // Search for nonce tag
+    cJSON* tag = NULL;
+    cJSON_ArrayForEach(tag, tags) {
+        if (!cJSON_IsArray(tag) || cJSON_GetArraySize(tag) < 2) {
+            continue;
+        }
+        
+        // Check if this is a nonce tag
+        cJSON* tag_type = cJSON_GetArrayItem(tag, 0);
+        if (!tag_type || !cJSON_IsString(tag_type)) {
+            continue;
+        }
+        
+        const char* tag_name = cJSON_GetStringValue(tag_type);
+        if (!tag_name || strcmp(tag_name, "nonce") != 0) {
+            continue;
+        }
+        
+        // Extract nonce value (second element)
+        cJSON* nonce_item = cJSON_GetArrayItem(tag, 1);
+        if (!nonce_item || !cJSON_IsString(nonce_item)) {
+            return NOSTR_ERROR_NIP13_INVALID_NONCE_TAG;
+        }
+        
+        const char* nonce_str = cJSON_GetStringValue(nonce_item);
+        if (!nonce_str) {
+            return NOSTR_ERROR_NIP13_INVALID_NONCE_TAG;
+        }
+        
+        // Parse nonce value
+        char* endptr;
+        uint64_t nonce_val = strtoull(nonce_str, &endptr, 10);
+        if (*endptr != '\0') {
+            return NOSTR_ERROR_NIP13_INVALID_NONCE_TAG;
+        }
+        
+        if (nonce_out) *nonce_out = nonce_val;
+        
+        // Extract target difficulty (third element, optional)
+        if (cJSON_GetArraySize(tag) >= 3) {
+            cJSON* target_item = cJSON_GetArrayItem(tag, 2);
+            if (target_item && cJSON_IsString(target_item)) {
+                const char* target_str = cJSON_GetStringValue(target_item);
+                if (target_str) {
+                    char* endptr2;
+                    long target_val = strtol(target_str, &endptr2, 10);
+                    if (*endptr2 == '\0' && target_val >= 0) {
+                        if (target_difficulty_out) *target_difficulty_out = (int)target_val;
+                    }
+                }
+            }
+        }
+        
+        return NOSTR_SUCCESS;
+    }
+    
+    // No nonce tag found
+    return NOSTR_ERROR_NIP13_NO_NONCE_TAG;
+}
+
+/**
+ * Validate just the nonce tag format (without PoW calculation)
+ *
+ * @param nonce_tag_array JSON array representing a nonce tag
+ * @return NOSTR_SUCCESS if valid format, error code otherwise
+ */
+int nostr_validate_nonce_tag(cJSON* nonce_tag_array) {
+    if (!nonce_tag_array || !cJSON_IsArray(nonce_tag_array)) {
+        return NOSTR_ERROR_NIP13_INVALID_NONCE_TAG;
+    }
+    
+    int array_size = cJSON_GetArraySize(nonce_tag_array);
+    if (array_size < 2) {
+        return NOSTR_ERROR_NIP13_INVALID_NONCE_TAG;
+    }
+    
+    // First element should be "nonce"
+    cJSON* tag_type = cJSON_GetArrayItem(nonce_tag_array, 0);
+    if (!tag_type || !cJSON_IsString(tag_type)) {
+        return NOSTR_ERROR_NIP13_INVALID_NONCE_TAG;
+    }
+    
+    const char* tag_name = cJSON_GetStringValue(tag_type);
+    if (!tag_name || strcmp(tag_name, "nonce") != 0) {
+        return NOSTR_ERROR_NIP13_INVALID_NONCE_TAG;
+    }
+    
+    // Second element should be a valid nonce (numeric string)
+    cJSON* nonce_item = cJSON_GetArrayItem(nonce_tag_array, 1);
+    if (!nonce_item || !cJSON_IsString(nonce_item)) {
+        return NOSTR_ERROR_NIP13_INVALID_NONCE_TAG;
+    }
+    
+    const char* nonce_str = cJSON_GetStringValue(nonce_item);
+    if (!nonce_str) {
+        return NOSTR_ERROR_NIP13_INVALID_NONCE_TAG;
+    }
+    
+    // Validate nonce is a valid number
+    char* endptr;
+    strtoull(nonce_str, &endptr, 10);
+    if (*endptr != '\0') {
+        return NOSTR_ERROR_NIP13_INVALID_NONCE_TAG;
+    }
+    
+    // Third element (target difficulty) is optional, but if present should be valid
+    if (array_size >= 3) {
+        cJSON* target_item = cJSON_GetArrayItem(nonce_tag_array, 2);
+        if (target_item && cJSON_IsString(target_item)) {
+            const char* target_str = cJSON_GetStringValue(target_item);
+            if (target_str) {
+                char* endptr2;
+                strtol(target_str, &endptr2, 10);
+                if (*endptr2 != '\0') {
+                    return NOSTR_ERROR_NIP13_INVALID_NONCE_TAG;
+                }
+            }
+        }
+    }
+    
+    return NOSTR_SUCCESS;
+}
+
+/**
+ * Validate Proof of Work for an event according to NIP-13
+ *
+ * @param event Complete event JSON object to validate
+ * @param min_difficulty Minimum difficulty required by the relay (0 = no requirement)
+ * @param validation_flags Bitflags for validation options
+ * @param result_info Optional output struct for detailed results (can be NULL)
+ * @return NOSTR_SUCCESS if PoW is valid and meets requirements, error code otherwise
+ */
+int nostr_validate_pow(cJSON* event, int min_difficulty, int validation_flags,
+                      nostr_pow_result_t* result_info) {
+    if (!event) {
+        return NOSTR_ERROR_INVALID_INPUT;
+    }
+    
+    // Initialize result info if provided
+    if (result_info) {
+        result_info->actual_difficulty = 0;
+        result_info->committed_target = -1;
+        result_info->nonce_value = 0;
+        result_info->has_nonce_tag = 0;
+        result_info->error_detail[0] = '\0';
+    }
+    
+    // Get event ID for PoW calculation
+    cJSON* id_item = cJSON_GetObjectItem(event, "id");
+    if (!id_item || !cJSON_IsString(id_item)) {
+        if (result_info) {
+            snprintf(result_info->error_detail, sizeof(result_info->error_detail),
+                    "Missing or invalid event ID");
+        }
+        return NOSTR_ERROR_EVENT_INVALID_ID;
+    }
+    
+    const char* event_id = cJSON_GetStringValue(id_item);
+    if (!event_id) {
+        if (result_info) {
+            snprintf(result_info->error_detail, sizeof(result_info->error_detail),
+                    "Event ID is not a string");
+        }
+        return NOSTR_ERROR_EVENT_INVALID_ID;
+    }
+    
+    // Calculate actual PoW difficulty
+    int actual_difficulty = nostr_calculate_pow_difficulty(event_id);
+    if (actual_difficulty < 0) {
+        if (result_info) {
+            snprintf(result_info->error_detail, sizeof(result_info->error_detail),
+                    "Failed to calculate PoW difficulty");
+        }
+        return actual_difficulty; // Return the specific error from calculation
+    }
+    
+    if (result_info) {
+        result_info->actual_difficulty = actual_difficulty;
+    }
+    
+    // Check if minimum difficulty requirement is met
+    if (min_difficulty > 0 && actual_difficulty < min_difficulty) {
+        if (result_info) {
+            snprintf(result_info->error_detail, sizeof(result_info->error_detail),
+                    "Insufficient difficulty: %d < %d", actual_difficulty, min_difficulty);
+        }
+        return NOSTR_ERROR_NIP13_INSUFFICIENT;
+    }
+    
+    // Extract nonce information if validation flags require it
+    uint64_t nonce_value = 0;
+    int committed_target = -1;
+    int nonce_extract_result = nostr_extract_nonce_info(event, &nonce_value, &committed_target);
+    
+    if (result_info) {
+        result_info->nonce_value = nonce_value;
+        result_info->committed_target = committed_target;
+        result_info->has_nonce_tag = (nonce_extract_result == NOSTR_SUCCESS) ? 1 : 0;
+    }
+    
+    // Validate nonce tag presence if required
+    if (validation_flags & NOSTR_POW_VALIDATE_NONCE_TAG) {
+        if (nonce_extract_result == NOSTR_ERROR_NIP13_NO_NONCE_TAG) {
+            if (result_info) {
+                snprintf(result_info->error_detail, sizeof(result_info->error_detail),
+                        "Missing required nonce tag");
+            }
+            return NOSTR_ERROR_NIP13_NO_NONCE_TAG;
+        } else if (nonce_extract_result != NOSTR_SUCCESS) {
+            if (result_info) {
+                snprintf(result_info->error_detail, sizeof(result_info->error_detail),
+                        "Invalid nonce tag format");
+            }
+            return nonce_extract_result;
+        }
+        
+        // If strict format validation is enabled, validate the nonce tag structure
+        if (validation_flags & NOSTR_POW_STRICT_FORMAT) {
+            cJSON* tags = cJSON_GetObjectItem(event, "tags");
+            if (tags && cJSON_IsArray(tags)) {
+                cJSON* tag = NULL;
+                cJSON_ArrayForEach(tag, tags) {
+                    if (cJSON_IsArray(tag) && cJSON_GetArraySize(tag) >= 2) {
+                        cJSON* tag_type = cJSON_GetArrayItem(tag, 0);
+                        if (tag_type && cJSON_IsString(tag_type)) {
+                            const char* tag_name = cJSON_GetStringValue(tag_type);
+                            if (tag_name && strcmp(tag_name, "nonce") == 0) {
+                                int validation_result = nostr_validate_nonce_tag(tag);
+                                if (validation_result != NOSTR_SUCCESS) {
+                                    if (result_info) {
+                                        snprintf(result_info->error_detail, sizeof(result_info->error_detail),
+                                                "Nonce tag failed strict format validation");
+                                    }
+                                    return validation_result;
+                                }
+                                break;
+                            }
+                        }
+                    }
+                }
+            }
+        }
+    }
+    
+    // Validate committed target difficulty if required
+    if (validation_flags & NOSTR_POW_VALIDATE_TARGET_COMMIT) {
+        if (nonce_extract_result == NOSTR_SUCCESS && committed_target == -1) {
+            if (result_info) {
+                snprintf(result_info->error_detail, sizeof(result_info->error_detail),
+                        "Missing committed target difficulty in nonce tag");
+            }
+            return NOSTR_ERROR_NIP13_INVALID_NONCE_TAG;
+        }
+        
+        // Check for target/difficulty mismatch if rejecting lower targets
+        if (validation_flags & NOSTR_POW_REJECT_LOWER_TARGET) {
+            // According to NIP-13: "if you require 40 bits to reply to your thread and see
+            // a committed target of 30, you can safely reject it even if the note has 40 bits difficulty"
+            // This means we reject if committed_target < min_difficulty, not actual_difficulty
+            if (committed_target != -1 && min_difficulty > 0 && committed_target < min_difficulty) {
+                if (result_info) {
+                    snprintf(result_info->error_detail, sizeof(result_info->error_detail),
+                            "Committed target (%d) is lower than required minimum (%d)",
+                            committed_target, min_difficulty);
+                }
+                return NOSTR_ERROR_NIP13_TARGET_MISMATCH;
+            }
+        }
+    }
+    
+    // All validations passed
+    if (result_info) {
+        snprintf(result_info->error_detail, sizeof(result_info->error_detail),
+                "PoW validation successful");
+    }
+    
+    return NOSTR_SUCCESS;
+}
@@ -0,0 +1,48 @@
+/*
+ * NOSTR Core Library - NIP-013: Proof of Work
+ */
+
+#ifndef NIP013_H
+#define NIP013_H
+
+#include "nip001.h"
+#include <stdint.h>
+
+// PoW validation flags
+#define NOSTR_POW_VALIDATE_NONCE_TAG     0x01  // Require and validate nonce tag format
+#define NOSTR_POW_VALIDATE_TARGET_COMMIT  0x02  // Validate committed target difficulty
+#define NOSTR_POW_REJECT_LOWER_TARGET    0x04  // Reject if committed target < actual difficulty
+#define NOSTR_POW_STRICT_FORMAT          0x08  // Strict nonce tag format validation
+
+// Convenience combinations
+#define NOSTR_POW_VALIDATE_BASIC         (NOSTR_POW_VALIDATE_NONCE_TAG)
+#define NOSTR_POW_VALIDATE_FULL          (NOSTR_POW_VALIDATE_NONCE_TAG | NOSTR_POW_VALIDATE_TARGET_COMMIT)
+#define NOSTR_POW_VALIDATE_ANTI_SPAM     (NOSTR_POW_VALIDATE_FULL | NOSTR_POW_REJECT_LOWER_TARGET)
+
+// Result information structure (optional output)
+typedef struct {
+    int actual_difficulty;        // Calculated difficulty (leading zero bits)
+    int committed_target;         // Target difficulty from nonce tag (-1 if none)
+    uint64_t nonce_value;        // Nonce value from tag (0 if none)
+    int has_nonce_tag;           // 1 if nonce tag present, 0 otherwise
+    char error_detail[256];      // Detailed error description
+} nostr_pow_result_t;
+
+// Function declarations
+int nostr_add_proof_of_work(cJSON* event, const unsigned char* private_key,
+                           int target_difficulty, int max_attempts,
+                           int progress_report_interval, int timestamp_update_interval,
+                           void (*progress_callback)(int current_difficulty, uint64_t nonce, void* user_data),
+                           void* user_data);
+
+// PoW validation functions
+int nostr_validate_pow(cJSON* event, int min_difficulty, int validation_flags,
+                      nostr_pow_result_t* result_info);
+
+int nostr_calculate_pow_difficulty(const char* event_id_hex);
+
+int nostr_extract_nonce_info(cJSON* event, uint64_t* nonce_out, int* target_difficulty_out);
+
+int nostr_validate_nonce_tag(cJSON* nonce_tag_array);
+
+#endif // NIP013_H
@@ -0,0 +1,407 @@
+/*
+ * NIP-17: Private Direct Messages Implementation
+ * https://github.com/nostr-protocol/nips/blob/master/17.md
+ */
+
+#define _GNU_SOURCE
+#include "nip017.h"
+#include "nip059.h"
+#include "nip001.h"
+#include "utils.h"
+#include "nostr_common.h"
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <time.h>
+
+// Forward declarations for crypto functions
+int nostr_ec_public_key_from_private_key(const unsigned char* private_key, unsigned char* public_key);
+
+/**
+ * Create tags array for DM events
+ */
+static cJSON* create_dm_tags(const char** recipient_pubkeys,
+                           int num_recipients,
+                           const char* subject,
+                           const char* reply_to_event_id,
+                           const char* reply_relay_url) {
+    cJSON* tags = cJSON_CreateArray();
+    if (!tags) return NULL;
+
+    // Add "p" tags for each recipient
+    for (int i = 0; i < num_recipients; i++) {
+        cJSON* p_tag = cJSON_CreateArray();
+        if (!p_tag) {
+            cJSON_Delete(tags);
+            return NULL;
+        }
+        cJSON_AddItemToArray(p_tag, cJSON_CreateString("p"));
+        cJSON_AddItemToArray(p_tag, cJSON_CreateString(recipient_pubkeys[i]));
+        // Add relay URL if provided (recommended)
+        if (reply_relay_url) {
+            cJSON_AddItemToArray(p_tag, cJSON_CreateString(reply_relay_url));
+        }
+        cJSON_AddItemToArray(tags, p_tag);
+    }
+
+    // Add subject tag if provided
+    if (subject && strlen(subject) > 0) {
+        cJSON* subject_tag = cJSON_CreateArray();
+        if (!subject_tag) {
+            cJSON_Delete(tags);
+            return NULL;
+        }
+        cJSON_AddItemToArray(subject_tag, cJSON_CreateString("subject"));
+        cJSON_AddItemToArray(subject_tag, cJSON_CreateString(subject));
+        cJSON_AddItemToArray(tags, subject_tag);
+    }
+
+    // Add reply reference if provided
+    if (reply_to_event_id && strlen(reply_to_event_id) > 0) {
+        cJSON* e_tag = cJSON_CreateArray();
+        if (!e_tag) {
+            cJSON_Delete(tags);
+            return NULL;
+        }
+        cJSON_AddItemToArray(e_tag, cJSON_CreateString("e"));
+        cJSON_AddItemToArray(e_tag, cJSON_CreateString(reply_to_event_id));
+        if (reply_relay_url) {
+            cJSON_AddItemToArray(e_tag, cJSON_CreateString(reply_relay_url));
+        }
+        // For replies, add "reply" marker as per NIP-17
+        cJSON_AddItemToArray(e_tag, cJSON_CreateString("reply"));
+        cJSON_AddItemToArray(tags, e_tag);
+    }
+
+    return tags;
+}
+
+/**
+ * NIP-17: Create a chat message event (kind 14)
+ */
+cJSON* nostr_nip17_create_chat_event(const char* message,
+                                    const char** recipient_pubkeys,
+                                    int num_recipients,
+                                    const char* subject,
+                                    const char* reply_to_event_id,
+                                    const char* reply_relay_url,
+                                    const char* sender_pubkey_hex) {
+    if (!message || !recipient_pubkeys || num_recipients <= 0 || !sender_pubkey_hex) {
+        return NULL;
+    }
+
+    // Create tags
+    cJSON* tags = create_dm_tags(recipient_pubkeys, num_recipients, subject,
+                               reply_to_event_id, reply_relay_url);
+    if (!tags) {
+        return NULL;
+    }
+
+    // Create the chat rumor (kind 14, unsigned)
+    cJSON* chat_event = nostr_nip59_create_rumor(14, message, tags, sender_pubkey_hex, 0);
+
+    cJSON_Delete(tags); // Tags are duplicated in create_rumor
+
+    return chat_event;
+}
+
+/**
+ * NIP-17: Create a file message event (kind 15)
+ */
+cJSON* nostr_nip17_create_file_event(const char* file_url,
+                                   const char* file_type,
+                                   const char* encryption_algorithm,
+                                   const char* decryption_key,
+                                   const char* decryption_nonce,
+                                   const char* file_hash,
+                                   const char* original_file_hash,
+                                   size_t file_size,
+                                   const char* dimensions,
+                                   const char* blurhash,
+                                   const char* thumbnail_url,
+                                   const char** recipient_pubkeys,
+                                   int num_recipients,
+                                   const char* subject,
+                                   const char* reply_to_event_id,
+                                   const char* reply_relay_url,
+                                   const char* sender_pubkey_hex) {
+    if (!file_url || !file_type || !encryption_algorithm || !decryption_key ||
+        !decryption_nonce || !file_hash || !recipient_pubkeys ||
+        num_recipients <= 0 || !sender_pubkey_hex) {
+        return NULL;
+    }
+
+    // Create base tags
+    cJSON* tags = create_dm_tags(recipient_pubkeys, num_recipients, subject,
+                               reply_to_event_id, reply_relay_url);
+    if (!tags) {
+        return NULL;
+    }
+
+    // Add file-specific tags
+    cJSON* file_type_tag = cJSON_CreateArray();
+    cJSON_AddItemToArray(file_type_tag, cJSON_CreateString("file-type"));
+    cJSON_AddItemToArray(file_type_tag, cJSON_CreateString(file_type));
+    cJSON_AddItemToArray(tags, file_type_tag);
+
+    cJSON* encryption_tag = cJSON_CreateArray();
+    cJSON_AddItemToArray(encryption_tag, cJSON_CreateString("encryption-algorithm"));
+    cJSON_AddItemToArray(encryption_tag, cJSON_CreateString(encryption_algorithm));
+    cJSON_AddItemToArray(tags, encryption_tag);
+
+    cJSON* key_tag = cJSON_CreateArray();
+    cJSON_AddItemToArray(key_tag, cJSON_CreateString("decryption-key"));
+    cJSON_AddItemToArray(key_tag, cJSON_CreateString(decryption_key));
+    cJSON_AddItemToArray(tags, key_tag);
+
+    cJSON* nonce_tag = cJSON_CreateArray();
+    cJSON_AddItemToArray(nonce_tag, cJSON_CreateString("decryption-nonce"));
+    cJSON_AddItemToArray(nonce_tag, cJSON_CreateString(decryption_nonce));
+    cJSON_AddItemToArray(tags, nonce_tag);
+
+    cJSON* x_tag = cJSON_CreateArray();
+    cJSON_AddItemToArray(x_tag, cJSON_CreateString("x"));
+    cJSON_AddItemToArray(x_tag, cJSON_CreateString(file_hash));
+    cJSON_AddItemToArray(tags, x_tag);
+
+    // Optional tags
+    if (original_file_hash && strlen(original_file_hash) > 0) {
+        cJSON* ox_tag = cJSON_CreateArray();
+        cJSON_AddItemToArray(ox_tag, cJSON_CreateString("ox"));
+        cJSON_AddItemToArray(ox_tag, cJSON_CreateString(original_file_hash));
+        cJSON_AddItemToArray(tags, ox_tag);
+    }
+
+    if (file_size > 0) {
+        char size_str[32];
+        snprintf(size_str, sizeof(size_str), "%zu", file_size);
+        cJSON* size_tag = cJSON_CreateArray();
+        cJSON_AddItemToArray(size_tag, cJSON_CreateString("size"));
+        cJSON_AddItemToArray(size_tag, cJSON_CreateString(size_str));
+        cJSON_AddItemToArray(tags, size_tag);
+    }
+
+    if (dimensions && strlen(dimensions) > 0) {
+        cJSON* dim_tag = cJSON_CreateArray();
+        cJSON_AddItemToArray(dim_tag, cJSON_CreateString("dim"));
+        cJSON_AddItemToArray(dim_tag, cJSON_CreateString(dimensions));
+        cJSON_AddItemToArray(tags, dim_tag);
+    }
+
+    if (blurhash && strlen(blurhash) > 0) {
+        cJSON* blurhash_tag = cJSON_CreateArray();
+        cJSON_AddItemToArray(blurhash_tag, cJSON_CreateString("blurhash"));
+        cJSON_AddItemToArray(blurhash_tag, cJSON_CreateString(blurhash));
+        cJSON_AddItemToArray(tags, blurhash_tag);
+    }
+
+    if (thumbnail_url && strlen(thumbnail_url) > 0) {
+        cJSON* thumb_tag = cJSON_CreateArray();
+        cJSON_AddItemToArray(thumb_tag, cJSON_CreateString("thumb"));
+        cJSON_AddItemToArray(thumb_tag, cJSON_CreateString(thumbnail_url));
+        cJSON_AddItemToArray(tags, thumb_tag);
+    }
+
+    // Create the file rumor (kind 15, unsigned)
+    cJSON* file_event = nostr_nip59_create_rumor(15, file_url, tags, sender_pubkey_hex, 0);
+
+    cJSON_Delete(tags); // Tags are duplicated in create_rumor
+
+    return file_event;
+}
+
+/**
+ * NIP-17: Create a relay list event (kind 10050)
+ */
+cJSON* nostr_nip17_create_relay_list_event(const char** relay_urls,
+                                         int num_relays,
+                                         const unsigned char* private_key) {
+    if (!relay_urls || num_relays <= 0 || !private_key) {
+        return NULL;
+    }
+
+    // Get public key
+    unsigned char public_key[32];
+    if (nostr_ec_public_key_from_private_key(private_key, public_key) != 0) {
+        return NULL;
+    }
+
+    char pubkey_hex[65];
+    nostr_bytes_to_hex(public_key, 32, pubkey_hex);
+
+    // Create tags with relay URLs
+    cJSON* tags = cJSON_CreateArray();
+    if (!tags) {
+        return NULL;
+    }
+
+    for (int i = 0; i < num_relays; i++) {
+        cJSON* relay_tag = cJSON_CreateArray();
+        if (!relay_tag) {
+            cJSON_Delete(tags);
+            return NULL;
+        }
+        cJSON_AddItemToArray(relay_tag, cJSON_CreateString("relay"));
+        cJSON_AddItemToArray(relay_tag, cJSON_CreateString(relay_urls[i]));
+        cJSON_AddItemToArray(tags, relay_tag);
+    }
+
+    // Create and sign the event
+    cJSON* relay_event = nostr_create_and_sign_event(10050, "", tags, private_key, time(NULL));
+
+    cJSON_Delete(tags); // Tags are duplicated in create_and_sign_event
+
+    return relay_event;
+}
+
+/**
+ * NIP-17: Send a direct message to recipients
+ */
+int nostr_nip17_send_dm(cJSON* dm_event,
+                        const char** recipient_pubkeys,
+                        int num_recipients,
+                        const unsigned char* sender_private_key,
+                        cJSON** gift_wraps_out,
+                        int max_gift_wraps,
+                        long max_delay_sec) {
+    if (!dm_event || !recipient_pubkeys || num_recipients <= 0 ||
+        !sender_private_key || !gift_wraps_out || max_gift_wraps <= 0) {
+        return -1;
+    }
+
+    int created_wraps = 0;
+
+    for (int i = 0; i < num_recipients && created_wraps < max_gift_wraps; i++) {
+        // Convert recipient pubkey hex to bytes
+        unsigned char recipient_public_key[32];
+        if (nostr_hex_to_bytes(recipient_pubkeys[i], recipient_public_key, 32) != 0) {
+            continue; // Skip invalid pubkeys
+        }
+
+        // Create seal for this recipient
+        cJSON* seal = nostr_nip59_create_seal(dm_event, sender_private_key, recipient_public_key, max_delay_sec);
+        if (!seal) {
+            continue; // Skip if sealing fails
+        }
+
+        // Create gift wrap for this recipient
+        cJSON* gift_wrap = nostr_nip59_create_gift_wrap(seal, recipient_pubkeys[i], max_delay_sec);
+        cJSON_Delete(seal); // Seal is now wrapped
+
+        if (!gift_wrap) {
+            continue; // Skip if wrapping fails
+        }
+
+        gift_wraps_out[created_wraps++] = gift_wrap;
+    }
+
+    // Also create a gift wrap for the sender (so they can see their own messages)
+    if (created_wraps < max_gift_wraps) {
+        // Get sender's public key
+        unsigned char sender_public_key[32];
+        if (nostr_ec_public_key_from_private_key(sender_private_key, sender_public_key) == 0) {
+            char sender_pubkey_hex[65];
+            nostr_bytes_to_hex(sender_public_key, 32, sender_pubkey_hex);
+
+            // Create seal for sender
+            cJSON* sender_seal = nostr_nip59_create_seal(dm_event, sender_private_key, sender_public_key, max_delay_sec);
+            if (sender_seal) {
+                // Create gift wrap for sender
+                cJSON* sender_gift_wrap = nostr_nip59_create_gift_wrap(sender_seal, sender_pubkey_hex, max_delay_sec);
+                cJSON_Delete(sender_seal);
+
+                if (sender_gift_wrap) {
+                    gift_wraps_out[created_wraps++] = sender_gift_wrap;
+                }
+            }
+        }
+    }
+
+    return created_wraps;
+}
+
+/**
+ * NIP-17: Receive and decrypt a direct message
+ */
+cJSON* nostr_nip17_receive_dm(cJSON* gift_wrap,
+                            const unsigned char* recipient_private_key) {
+    if (!gift_wrap || !recipient_private_key) {
+        return NULL;
+    }
+
+    // Unwrap the gift wrap to get the seal
+    cJSON* seal = nostr_nip59_unwrap_gift(gift_wrap, recipient_private_key);
+    if (!seal) {
+        return NULL;
+    }
+
+    // Get sender's public key from the seal
+    cJSON* seal_pubkey_item = cJSON_GetObjectItem(seal, "pubkey");
+    if (!seal_pubkey_item || !cJSON_IsString(seal_pubkey_item)) {
+        cJSON_Delete(seal);
+        return NULL;
+    }
+
+    const char* sender_pubkey_hex = cJSON_GetStringValue(seal_pubkey_item);
+
+    // Convert sender pubkey hex to bytes
+    unsigned char sender_public_key[32];
+    if (nostr_hex_to_bytes(sender_pubkey_hex, sender_public_key, 32) != 0) {
+        cJSON_Delete(seal);
+        return NULL;
+    }
+
+    // Unseal the rumor
+    cJSON* rumor = nostr_nip59_unseal_rumor(seal, sender_public_key, recipient_private_key);
+    cJSON_Delete(seal); // Seal is no longer needed
+
+    return rumor;
+}
+
+/**
+ * NIP-17: Extract DM relay URLs from a user's kind 10050 event
+ */
+int nostr_nip17_extract_dm_relays(cJSON* relay_list_event,
+                                char** relay_urls_out,
+                                int max_relays) {
+    if (!relay_list_event || !relay_urls_out || max_relays <= 0) {
+        return -1;
+    }
+
+    // Check if this is a kind 10050 event
+    cJSON* kind_item = cJSON_GetObjectItem(relay_list_event, "kind");
+    if (!kind_item || !cJSON_IsNumber(kind_item) || cJSON_GetNumberValue(kind_item) != 10050) {
+        return -1;
+    }
+
+    // Get tags array
+    cJSON* tags_item = cJSON_GetObjectItem(relay_list_event, "tags");
+    if (!tags_item || !cJSON_IsArray(tags_item)) {
+        return -1;
+    }
+
+    int extracted = 0;
+    cJSON* tag_item;
+    cJSON_ArrayForEach(tag_item, tags_item) {
+        if (!cJSON_IsArray(tag_item) || cJSON_GetArraySize(tag_item) < 2) {
+            continue;
+        }
+
+        // Check if this is a "relay" tag
+        cJSON* tag_name = cJSON_GetArrayItem(tag_item, 0);
+        cJSON* relay_url = cJSON_GetArrayItem(tag_item, 1);
+
+        if (cJSON_IsString(tag_name) && cJSON_IsString(relay_url) &&
+            strcmp(cJSON_GetStringValue(tag_name), "relay") == 0) {
+
+            if (extracted < max_relays) {
+                relay_urls_out[extracted] = strdup(cJSON_GetStringValue(relay_url));
+                if (relay_urls_out[extracted]) {
+                    extracted++;
+                }
+            }
+        }
+    }
+
+    return extracted;
+}
@@ -0,0 +1,139 @@
+/*
+ * NIP-17: Private Direct Messages
+ * https://github.com/nostr-protocol/nips/blob/master/17.md
+ */
+
+#ifndef NOSTR_NIP017_H
+#define NOSTR_NIP017_H
+
+#include <stddef.h>
+#include "../cjson/cJSON.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/**
+ * NIP-17: Create a chat message event (kind 14)
+ *
+ * @param message Plain text message content
+ * @param recipient_pubkeys Array of recipient public keys (hex strings)
+ * @param num_recipients Number of recipients
+ * @param subject Optional conversation subject/title (can be NULL)
+ * @param reply_to_event_id Optional event ID this message replies to (can be NULL)
+ * @param reply_relay_url Optional relay URL for reply reference (can be NULL)
+ * @param sender_pubkey_hex Sender's public key in hex format
+ * @return cJSON object representing the unsigned chat event, or NULL on error
+ */
+cJSON* nostr_nip17_create_chat_event(const char* message,
+                                    const char** recipient_pubkeys,
+                                    int num_recipients,
+                                    const char* subject,
+                                    const char* reply_to_event_id,
+                                    const char* reply_relay_url,
+                                    const char* sender_pubkey_hex);
+
+/**
+ * NIP-17: Create a file message event (kind 15)
+ *
+ * @param file_url URL of the encrypted file
+ * @param file_type MIME type of the original file (e.g., "image/jpeg")
+ * @param encryption_algorithm Encryption algorithm used ("aes-gcm")
+ * @param decryption_key Base64-encoded decryption key
+ * @param decryption_nonce Base64-encoded decryption nonce
+ * @param file_hash SHA-256 hash of the encrypted file (hex)
+ * @param original_file_hash SHA-256 hash of the original file before encryption (hex, optional)
+ * @param file_size Size of encrypted file in bytes (optional, 0 to skip)
+ * @param dimensions Image dimensions in "WxH" format (optional, NULL to skip)
+ * @param blurhash Blurhash for preview (optional, NULL to skip)
+ * @param thumbnail_url URL of encrypted thumbnail (optional, NULL to skip)
+ * @param recipient_pubkeys Array of recipient public keys (hex strings)
+ * @param num_recipients Number of recipients
+ * @param subject Optional conversation subject/title (can be NULL)
+ * @param reply_to_event_id Optional event ID this message replies to (can be NULL)
+ * @param reply_relay_url Optional relay URL for reply reference (can be NULL)
+ * @param sender_pubkey_hex Sender's public key in hex format
+ * @return cJSON object representing the unsigned file event, or NULL on error
+ */
+cJSON* nostr_nip17_create_file_event(const char* file_url,
+                                   const char* file_type,
+                                   const char* encryption_algorithm,
+                                   const char* decryption_key,
+                                   const char* decryption_nonce,
+                                   const char* file_hash,
+                                   const char* original_file_hash,
+                                   size_t file_size,
+                                   const char* dimensions,
+                                   const char* blurhash,
+                                   const char* thumbnail_url,
+                                   const char** recipient_pubkeys,
+                                   int num_recipients,
+                                   const char* subject,
+                                   const char* reply_to_event_id,
+                                   const char* reply_relay_url,
+                                   const char* sender_pubkey_hex);
+
+/**
+ * NIP-17: Create a relay list event (kind 10050)
+ *
+ * @param relay_urls Array of relay URLs for DM delivery
+ * @param num_relays Number of relay URLs
+ * @param private_key Sender's private key for signing
+ * @return cJSON object representing the signed relay list event, or NULL on error
+ */
+cJSON* nostr_nip17_create_relay_list_event(const char** relay_urls,
+                                         int num_relays,
+                                         const unsigned char* private_key);
+
+/**
+ * NIP-17: Send a direct message to recipients
+ *
+ * This function creates the appropriate rumor, seals it, gift wraps it,
+ * and returns the final gift wrap events ready for publishing.
+ *
+ * @param dm_event The unsigned DM event (kind 14 or 15)
+ * @param recipient_pubkeys Array of recipient public keys (hex strings)
+ * @param num_recipients Number of recipients
+ * @param sender_private_key 32-byte sender private key
+ * @param gift_wraps_out Array to store resulting gift wrap events (caller must free)
+ * @param max_gift_wraps Maximum number of gift wraps to create
+ * @param max_delay_sec Maximum random timestamp delay in seconds (0 = no randomization)
+ * @return Number of gift wrap events created, or -1 on error
+ */
+int nostr_nip17_send_dm(cJSON* dm_event,
+                       const char** recipient_pubkeys,
+                       int num_recipients,
+                       const unsigned char* sender_private_key,
+                       cJSON** gift_wraps_out,
+                       int max_gift_wraps,
+                       long max_delay_sec);
+
+/**
+ * NIP-17: Receive and decrypt a direct message
+ *
+ * This function unwraps a gift wrap, unseals the rumor, and returns the original DM event.
+ *
+ * @param gift_wrap The received gift wrap event (kind 1059)
+ * @param recipient_private_key 32-byte recipient private key
+ * @return cJSON object representing the decrypted DM event, or NULL on error
+ */
+cJSON* nostr_nip17_receive_dm(cJSON* gift_wrap,
+                            const unsigned char* recipient_private_key);
+
+/**
+ * NIP-17: Extract DM relay URLs from a user's kind 10050 event
+ *
+ * @param relay_list_event The kind 10050 event
+ * @param relay_urls_out Array to store extracted relay URLs (caller must free)
+ * @param max_relays Maximum number of relays to extract
+ * @return Number of relay URLs extracted, or -1 on error
+ */
+int nostr_nip17_extract_dm_relays(cJSON* relay_list_event,
+                                char** relay_urls_out,
+                                int max_relays);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif // NOSTR_NIP017_H
@@ -0,0 +1,265 @@
+/*
+ * NOSTR Core Library - NIP-019: Bech32-encoded Entities
+ */
+
+#include "nip019.h"
+#include "utils.h"
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <ctype.h>
+#include "../nostr_core/nostr_common.h"
+
+#define BECH32_CONST 1
+
+static const char bech32_charset[] = "qpzry9x8gf2tvdw0s3jn54khce6mua7l";
+
+static const int8_t bech32_charset_rev[128] = {
+    -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
+    -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
+    -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
+    15, -1, 10, 17, 21, 20, 26, 30,  7,  5, -1, -1, -1, -1, -1, -1,
+    -1, 29, -1, 24, 13, 25,  9,  8, 23, -1, 18, 22, 31, 27, 19, -1,
+    1,  0,  3, 16, 11, 28, 12, 14,  6,  4,  2, -1, -1, -1, -1, -1,
+    -1, 29, -1, 24, 13, 25,  9,  8, 23, -1, 18, 22, 31, 27, 19, -1,
+    1,  0,  3, 16, 11, 28, 12, 14,  6,  4,  2, -1, -1, -1, -1, -1
+};
+
+static uint32_t bech32_polymod_step(uint32_t pre) {
+    uint8_t b = pre >> 25;
+    return ((pre & 0x1FFFFFF) << 5) ^
+           (-((b >> 0) & 1) & 0x3b6a57b2UL) ^
+           (-((b >> 1) & 1) & 0x26508e6dUL) ^
+           (-((b >> 2) & 1) & 0x1ea119faUL) ^
+           (-((b >> 3) & 1) & 0x3d4233ddUL) ^
+           (-((b >> 4) & 1) & 0x2a1462b3UL);
+}
+
+static int convert_bits(uint8_t *out, size_t *outlen, int outbits, const uint8_t *in, size_t inlen, int inbits, int pad) {
+    uint32_t val = 0;
+    int bits = 0;
+    uint32_t maxv = (((uint32_t)1) << outbits) - 1;
+    *outlen = 0;
+    while (inlen--) {
+        val = (val << inbits) | *(in++);
+        bits += inbits;
+        while (bits >= outbits) {
+            bits -= outbits;
+            out[(*outlen)++] = (val >> bits) & maxv;
+        }
+    }
+    if (pad) {
+        if (bits) {
+            out[(*outlen)++] = (val << (outbits - bits)) & maxv;
+        }
+    } else if (((val << (outbits - bits)) & maxv) || bits >= inbits) {
+        return 0;
+    }
+    return 1;
+}
+
+static int bech32_encode(char *output, const char *hrp, const uint8_t *data, size_t data_len) {
+    uint32_t chk = 1;
+    size_t i, hrp_len = strlen(hrp);
+    
+    for (i = 0; i < hrp_len; ++i) {
+        int ch = hrp[i];
+        if (ch < 33 || ch > 126) return 0;
+        if (ch >= 'A' && ch <= 'Z') return 0;
+        chk = bech32_polymod_step(chk) ^ (ch >> 5);
+    }
+    
+    chk = bech32_polymod_step(chk);
+    for (i = 0; i < hrp_len; ++i) {
+        chk = bech32_polymod_step(chk) ^ (hrp[i] & 0x1f);
+        *(output++) = hrp[i];
+    }
+    
+    *(output++) = '1';
+    for (i = 0; i < data_len; ++i) {
+        if (*data >> 5) return 0;
+        chk = bech32_polymod_step(chk) ^ (*data);
+        *(output++) = bech32_charset[*(data++)];
+    }
+    
+    for (i = 0; i < 6; ++i) {
+        chk = bech32_polymod_step(chk);
+    }
+    
+    chk ^= BECH32_CONST;
+    for (i = 0; i < 6; ++i) {
+        *(output++) = bech32_charset[(chk >> ((5 - i) * 5)) & 0x1f];
+    }
+    
+    *output = 0;
+    return 1;
+}
+
+static int bech32_decode(const char* input, const char* hrp, unsigned char* data, size_t* data_len) {
+    if (!input || !hrp || !data || !data_len) {
+        return 0;
+    }
+    
+    size_t input_len = strlen(input);
+    size_t hrp_len = strlen(hrp);
+    
+    if (input_len < hrp_len + 7) return 0;
+    if (strncmp(input, hrp, hrp_len) != 0) return 0;
+    if (input[hrp_len] != '1') return 0;
+    
+    const char* data_part = input + hrp_len + 1;
+    size_t data_part_len = input_len - hrp_len - 1;
+    
+    uint8_t values[256];
+    for (size_t i = 0; i < data_part_len; i++) {
+        unsigned char c = (unsigned char)data_part[i];
+        if (c >= 128) return 0;
+        int8_t val = bech32_charset_rev[c];
+        if (val == -1) return 0;
+        values[i] = (uint8_t)val;
+    }
+    
+    if (data_part_len < 6) return 0;
+    
+    uint32_t chk = 1;
+    for (size_t i = 0; i < hrp_len; i++) {
+        chk = bech32_polymod_step(chk) ^ (hrp[i] >> 5);
+    }
+    chk = bech32_polymod_step(chk);
+    for (size_t i = 0; i < hrp_len; i++) {
+        chk = bech32_polymod_step(chk) ^ (hrp[i] & 0x1f);
+    }
+    for (size_t i = 0; i < data_part_len; i++) {
+        chk = bech32_polymod_step(chk) ^ values[i];
+    }
+    
+    if (chk != BECH32_CONST) return 0;
+    
+    size_t payload_len = data_part_len - 6;
+    size_t decoded_len;
+    if (!convert_bits(data, &decoded_len, 8, values, payload_len, 5, 0)) {
+        return 0;
+    }
+    
+    *data_len = decoded_len;
+    return 1;
+}
+
+int nostr_key_to_bech32(const unsigned char* key, const char* hrp, char* output) {
+    if (!key || !hrp || !output) {
+        return NOSTR_ERROR_INVALID_INPUT;
+    }
+    
+    uint8_t conv[64];
+    size_t conv_len;
+    
+    if (!convert_bits(conv, &conv_len, 5, key, 32, 8, 1)) {
+        return NOSTR_ERROR_CRYPTO_FAILED;
+    }
+    
+    if (!bech32_encode(output, hrp, conv, conv_len)) {
+        return NOSTR_ERROR_CRYPTO_FAILED;
+    }
+    
+    return NOSTR_SUCCESS;
+}
+
+nostr_input_type_t nostr_detect_input_type(const char* input) {
+    if (!input || strlen(input) == 0) {
+        return NOSTR_INPUT_UNKNOWN;
+    }
+    
+    size_t len = strlen(input);
+    
+    // Check for bech32 nsec
+    if (len > 5 && strncmp(input, "nsec1", 5) == 0) {
+        return NOSTR_INPUT_NSEC_BECH32;
+    }
+    
+    // Check for hex nsec (64 characters, all hex)
+    if (len == 64) {
+        int is_hex = 1;
+        for (size_t i = 0; i < len; i++) {
+            if (!isxdigit(input[i])) {
+                is_hex = 0;
+                break;
+            }
+        }
+        if (is_hex) {
+            return NOSTR_INPUT_NSEC_HEX;
+        }
+    }
+    
+    // Check for mnemonic (space-separated words)
+    int word_count = 0;
+    char temp[1024];
+    strncpy(temp, input, sizeof(temp) - 1);
+    temp[sizeof(temp) - 1] = '\0';
+    
+    char* token = strtok(temp, " ");
+    while (token != NULL) {
+        word_count++;
+        token = strtok(NULL, " ");
+    }
+    
+    // BIP39 mnemonics are typically 12, 18, or 24 words
+    if (word_count >= 12 && word_count <= 24) {
+        return NOSTR_INPUT_MNEMONIC;
+    }
+    
+    return NOSTR_INPUT_UNKNOWN;
+}
+
+int nostr_decode_nsec(const char* input, unsigned char* private_key) {
+    if (!input || !private_key) {
+        return NOSTR_ERROR_INVALID_INPUT;
+    }
+    
+    nostr_input_type_t type = nostr_detect_input_type(input);
+    
+    if (type == NOSTR_INPUT_NSEC_HEX) {
+        if (nostr_hex_to_bytes(input, private_key, 32) != NOSTR_SUCCESS) {
+            return NOSTR_ERROR_INVALID_INPUT;
+        }
+    } else if (type == NOSTR_INPUT_NSEC_BECH32) {
+        size_t decoded_len;
+        if (!bech32_decode(input, "nsec", private_key, &decoded_len)) {
+            return NOSTR_ERROR_INVALID_INPUT;
+        }
+        if (decoded_len != 32) {
+            return NOSTR_ERROR_INVALID_INPUT;
+        }
+    } else {
+        return NOSTR_ERROR_INVALID_INPUT;
+    }
+    
+    // TODO: Add private key validation if crypto functions are available
+    
+    return NOSTR_SUCCESS;
+}
+
+int nostr_decode_npub(const char* input, unsigned char* public_key) {
+    if (!input || !public_key) {
+        return NOSTR_ERROR_INVALID_INPUT;
+    }
+    
+    nostr_input_type_t type = nostr_detect_input_type(input);
+    
+    if (type == NOSTR_INPUT_NSEC_HEX) {  // Actually public key hex
+        if (nostr_hex_to_bytes(input, public_key, 32) != NOSTR_SUCCESS) {
+            return NOSTR_ERROR_INVALID_INPUT;
+        }
+    } else if (strncmp(input, "npub1", 4) == 0) {  // Bech32 npub
+        size_t decoded_len;
+        if (!bech32_decode(input, "npub", public_key, &decoded_len)) {
+            return NOSTR_ERROR_INVALID_INPUT;
+        }
+        if (decoded_len != 32) {
+            return NOSTR_ERROR_INVALID_INPUT;
+        }
+    } else {
+        return NOSTR_ERROR_INVALID_INPUT;
+    }
+    
+    return NOSTR_SUCCESS;
+}
@@ -0,0 +1,17 @@
+/*
+ * NOSTR Core Library - NIP-019: Bech32-encoded Entities
+ */
+
+#ifndef NIP019_H
+#define NIP019_H
+
+#include "nip001.h"
+#include "nip006.h"  // For nostr_input_type_t enum
+
+// Function declarations
+int nostr_key_to_bech32(const unsigned char* key, const char* hrp, char* output);
+nostr_input_type_t nostr_detect_input_type(const char* input);
+int nostr_decode_nsec(const char* input, unsigned char* private_key);
+int nostr_decode_npub(const char* input, unsigned char* public_key);
+
+#endif // NIP019_H
@@ -0,0 +1,855 @@
+/*
+ * NOSTR Core Library - NIP-021: nostr: URI scheme
+ */
+
+#include "nip021.h"
+#include "nip019.h"  // For existing bech32 functions
+#include "utils.h"
+#include "nostr_common.h"  // For error codes
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <ctype.h>
+#include "../cjson/cJSON.h"
+
+// Forward declarations for internal parsing functions
+static int parse_nprofile_data(const uint8_t* data, size_t data_len, nostr_nprofile_t* nprofile);
+static int parse_nevent_data(const uint8_t* data, size_t data_len, nostr_nevent_t* nevent);
+static int parse_naddr_data(const uint8_t* data, size_t data_len, nostr_naddr_t* naddr);
+
+// Bech32 constants and functions (copied from nip019.c for internal use)
+static const char bech32_charset[] = "qpzry9x8gf2tvdw0s3jn54khce6mua7l";
+static const int8_t bech32_charset_rev[128] = {
+    -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
+    -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
+    -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
+    15, -1, 10, 17, 21, 20, 26, 30,  7,  5, -1, -1, -1, -1, -1, -1,
+    -1, 29, -1, 24, 13, 25,  9,  8, 23, -1, 18, 22, 31, 27, 19, -1,
+    1,  0,  3, 16, 11, 28, 12, 14,  6,  4,  2, -1, -1, -1, -1, -1,
+    -1, 29, -1, 24, 13, 25,  9,  8, 23, -1, 18, 22, 31, 27, 19, -1,
+    1,  0,  3, 16, 11, 28, 12, 14,  6,  4,  2, -1, -1, -1, -1, -1
+};
+
+static uint32_t bech32_polymod_step(uint32_t pre) {
+    uint8_t b = pre >> 25;
+    return ((pre & 0x1FFFFFF) << 5) ^
+           (-((b >> 0) & 1) & 0x3b6a57b2UL) ^
+           (-((b >> 1) & 1) & 0x26508e6dUL) ^
+           (-((b >> 2) & 1) & 0x1ea119faUL) ^
+           (-((b >> 3) & 1) & 0x3d4233ddUL) ^
+           (-((b >> 4) & 1) & 0x2a1462b3UL);
+}
+
+static int convert_bits(uint8_t *out, size_t *outlen, int outbits, const uint8_t *in, size_t inlen, int inbits, int pad) {
+    uint32_t val = 0;
+    int bits = 0;
+    uint32_t maxv = (((uint32_t)1) << outbits) - 1;
+    *outlen = 0;
+    while (inlen--) {
+        val = (val << inbits) | *(in++);
+        bits += inbits;
+        while (bits >= outbits) {
+            bits -= outbits;
+            out[(*outlen)++] = (val >> bits) & maxv;
+        }
+    }
+    if (pad) {
+        if (bits) {
+            out[(*outlen)++] = (val << (outbits - bits)) & maxv;
+        }
+    } else if (((val << (outbits - bits)) & maxv) || bits >= inbits) {
+        return 0;
+    }
+    return 1;
+}
+
+static int bech32_encode(char *output, const char *hrp, const uint8_t *data, size_t data_len) {
+    uint32_t chk = 1;
+    size_t i, hrp_len = strlen(hrp);
+
+    for (i = 0; i < hrp_len; ++i) {
+        int ch = hrp[i];
+        if (ch < 33 || ch > 126) return 0;
+        if (ch >= 'A' && ch <= 'Z') return 0;
+        chk = bech32_polymod_step(chk) ^ (ch >> 5);
+    }
+
+    chk = bech32_polymod_step(chk);
+    for (i = 0; i < hrp_len; ++i) {
+        chk = bech32_polymod_step(chk) ^ (hrp[i] & 0x1f);
+        *(output++) = hrp[i];
+    }
+
+    *(output++) = '1';
+    for (i = 0; i < data_len; ++i) {
+        if (*data >> 5) return 0;
+        chk = bech32_polymod_step(chk) ^ (*data);
+        *(output++) = bech32_charset[*(data++)];
+    }
+
+    for (i = 0; i < 6; ++i) {
+        chk = bech32_polymod_step(chk);
+    }
+
+    chk ^= 1;
+    for (i = 0; i < 6; ++i) {
+        *(output++) = bech32_charset[(chk >> ((5 - i) * 5)) & 0x1f];
+    }
+
+    *output = 0;
+    return 1;
+}
+
+static int bech32_decode(const char* input, const char* hrp, unsigned char* data, size_t* data_len) {
+    if (!input || !hrp || !data || !data_len) {
+        return 0;
+    }
+
+    size_t input_len = strlen(input);
+    size_t hrp_len = strlen(hrp);
+
+    if (input_len < hrp_len + 7) return 0;
+    if (strncmp(input, hrp, hrp_len) != 0) return 0;
+    if (input[hrp_len] != '1') return 0;
+
+    const char* data_part = input + hrp_len + 1;
+    size_t data_part_len = input_len - hrp_len - 1;
+
+    uint8_t values[256];
+    for (size_t i = 0; i < data_part_len; i++) {
+        unsigned char c = (unsigned char)data_part[i];
+        if (c >= 128) return 0;
+        int8_t val = bech32_charset_rev[c];
+        if (val == -1) return 0;
+        values[i] = (uint8_t)val;
+    }
+
+    if (data_part_len < 6) return 0;
+
+    uint32_t chk = 1;
+    for (size_t i = 0; i < hrp_len; i++) {
+        chk = bech32_polymod_step(chk) ^ (hrp[i] >> 5);
+    }
+    chk = bech32_polymod_step(chk);
+    for (size_t i = 0; i < hrp_len; i++) {
+        chk = bech32_polymod_step(chk) ^ (hrp[i] & 0x1f);
+    }
+    for (size_t i = 0; i < data_part_len; i++) {
+        chk = bech32_polymod_step(chk) ^ values[i];
+    }
+
+    if (chk != 1) return 0;
+
+    size_t payload_len = data_part_len - 6;
+    size_t decoded_len;
+    if (!convert_bits(data, &decoded_len, 8, values, payload_len, 5, 0)) {
+        return 0;
+    }
+
+    *data_len = decoded_len;
+    return 1;
+}
+
+// TLV (Type-Length-Value) constants for structured data
+#define TLV_SPECIAL 0
+#define TLV_RELAY 1
+#define TLV_AUTHOR 2
+#define TLV_KIND 3
+#define TLV_CREATED_AT 4
+#define TLV_IDENTIFIER 5
+
+// Forward declarations for internal functions
+static int tlv_encode(const uint8_t* data, size_t data_len, uint8_t type, uint8_t** output, size_t* output_len);
+static int encode_structured_bech32(const char* hrp, const uint8_t* data, size_t data_len, char* output, size_t output_size);
+static int decode_structured_bech32(const char* input, const char* expected_hrp, uint8_t** data, size_t* data_len);
+
+// Utility function to duplicate string array (removed - not used)
+
+// Free string array
+static void free_string_array(char** array, int count) {
+    if (!array) return;
+    for (int i = 0; i < count; i++) {
+        free(array[i]);
+    }
+    free(array);
+}
+
+// TLV encoding: Type (1 byte) + Length (1 byte) + Value
+static int tlv_encode(const uint8_t* data, size_t data_len, uint8_t type, uint8_t** output, size_t* output_len) {
+    if (data_len > 255) return 0; // Length must fit in 1 byte
+
+    *output_len = 2 + data_len;
+    *output = malloc(*output_len);
+    if (!*output) return 0;
+
+    (*output)[0] = type;
+    (*output)[1] = (uint8_t)data_len;
+    memcpy(*output + 2, data, data_len);
+    return 1;
+}
+
+// TLV decoding (removed - not used)
+
+// Encode structured data to bech32
+static int encode_structured_bech32(const char* hrp, const uint8_t* data, size_t data_len, char* output, size_t output_size) {
+    // For simple cases like note (32 bytes), use the existing key encoding
+    if (strcmp(hrp, "note") == 0 && data_len == 32) {
+        return nostr_key_to_bech32(data, "note", output);
+    }
+
+    uint8_t conv[256];
+    size_t conv_len;
+
+    if (!convert_bits(conv, &conv_len, 5, data, data_len, 8, 1)) {
+        return NOSTR_ERROR_INVALID_INPUT;
+    }
+
+    if (!bech32_encode(output, hrp, conv, conv_len)) {
+        return NOSTR_ERROR_INVALID_INPUT;
+    }
+
+    if (strlen(output) >= output_size) {
+        return NOSTR_ERROR_INVALID_INPUT;
+    }
+
+    return NOSTR_SUCCESS;
+}
+
+// Decode structured bech32 data
+static int decode_structured_bech32(const char* input, const char* expected_hrp, uint8_t** data, size_t* data_len) {
+    // bech32_decode already converts from 5-bit to 8-bit internally
+    *data = malloc(256);  // Max size
+    if (!*data) return NOSTR_ERROR_MEMORY_FAILED;
+
+    if (!bech32_decode(input, expected_hrp, *data, data_len)) {
+        free(*data);
+        return NOSTR_ERROR_INVALID_INPUT;
+    }
+
+    return NOSTR_SUCCESS;
+}
+
+// Detect URI type from string
+nostr_uri_type_t nostr_detect_uri_type(const char* uri) {
+    if (!uri) return NOSTR_URI_INVALID;
+
+    // Check for nostr: prefix
+    if (strncmp(uri, "nostr:", 6) != 0) {
+        return NOSTR_URI_INVALID;
+    }
+
+    const char* bech32_part = uri + 6;
+
+    // Check prefixes
+    if (strncmp(bech32_part, "npub1", 5) == 0) return NOSTR_URI_NPUB;
+    if (strncmp(bech32_part, "nsec1", 5) == 0) return NOSTR_URI_NSEC;
+    if (strncmp(bech32_part, "note1", 5) == 0) return NOSTR_URI_NOTE;
+    if (strncmp(bech32_part, "nprofile1", 9) == 0) return NOSTR_URI_NPROFILE;
+    if (strncmp(bech32_part, "nevent1", 7) == 0) return NOSTR_URI_NEVENT;
+    if (strncmp(bech32_part, "naddr1", 6) == 0) return NOSTR_URI_NADDR;
+
+    return NOSTR_URI_INVALID;
+}
+
+// Free URI result resources
+void nostr_uri_result_free(nostr_uri_result_t* result) {
+    if (!result) return;
+
+    switch (result->type) {
+        case NOSTR_URI_NPROFILE:
+            free_string_array(result->data.nprofile.relays, result->data.nprofile.relay_count);
+            break;
+        case NOSTR_URI_NEVENT:
+            free_string_array(result->data.nevent.relays, result->data.nevent.relay_count);
+            free(result->data.nevent.author);
+            free(result->data.nevent.kind);
+            free(result->data.nevent.created_at);
+            break;
+        case NOSTR_URI_NADDR:
+            free(result->data.naddr.identifier);
+            free_string_array(result->data.naddr.relays, result->data.naddr.relay_count);
+            break;
+        default:
+            break;
+    }
+}
+
+// Main URI parsing function
+int nostr_parse_uri(const char* uri, nostr_uri_result_t* result) {
+    if (!uri || !result) {
+        return NOSTR_ERROR_INVALID_INPUT;
+    }
+
+    memset(result, 0, sizeof(nostr_uri_result_t));
+
+    nostr_uri_type_t type = nostr_detect_uri_type(uri);
+    if (type == NOSTR_URI_INVALID) {
+        return NOSTR_ERROR_INVALID_INPUT;
+    }
+
+    const char* bech32_part = uri + 6; // Skip "nostr:"
+    result->type = type;
+
+    int ret;
+    switch (type) {
+        case NOSTR_URI_NPUB: {
+            ret = nostr_decode_npub(bech32_part, result->data.pubkey);
+            break;
+        }
+        case NOSTR_URI_NSEC: {
+            ret = nostr_decode_nsec(bech32_part, result->data.privkey);
+            break;
+        }
+        case NOSTR_URI_NOTE: {
+            // Note is similar to npub but with "note" prefix
+            uint8_t* decoded;
+            size_t decoded_len;
+            ret = decode_structured_bech32(bech32_part, "note", &decoded, &decoded_len);
+            if (ret == NOSTR_SUCCESS) {
+                if (decoded_len == 32) {
+                    memcpy(result->data.event_id, decoded, 32);
+                } else {
+                    ret = NOSTR_ERROR_INVALID_INPUT;
+                }
+                free(decoded);
+            }
+            break;
+        }
+        case NOSTR_URI_NPROFILE: {
+            uint8_t* decoded;
+            size_t decoded_len;
+            ret = decode_structured_bech32(bech32_part, "nprofile", &decoded, &decoded_len);
+            if (ret == NOSTR_SUCCESS) {
+                ret = parse_nprofile_data(decoded, decoded_len, &result->data.nprofile);
+                free(decoded);
+            }
+            break;
+        }
+        case NOSTR_URI_NEVENT: {
+            uint8_t* decoded;
+            size_t decoded_len;
+            ret = decode_structured_bech32(bech32_part, "nevent", &decoded, &decoded_len);
+            if (ret == NOSTR_SUCCESS) {
+                ret = parse_nevent_data(decoded, decoded_len, &result->data.nevent);
+                free(decoded);
+            }
+            break;
+        }
+        case NOSTR_URI_NADDR: {
+            uint8_t* decoded;
+            size_t decoded_len;
+            ret = decode_structured_bech32(bech32_part, "naddr", &decoded, &decoded_len);
+            if (ret == NOSTR_SUCCESS) {
+                ret = parse_naddr_data(decoded, decoded_len, &result->data.naddr);
+                free(decoded);
+            }
+            break;
+        }
+        default:
+            ret = NOSTR_ERROR_INVALID_INPUT;
+            break;
+    }
+
+    if (ret != NOSTR_SUCCESS) {
+        nostr_uri_result_free(result);
+        memset(result, 0, sizeof(nostr_uri_result_t));
+    }
+
+    return ret;
+}
+
+// Parse nprofile structured data
+static int parse_nprofile_data(const uint8_t* data, size_t data_len, nostr_nprofile_t* nprofile) {
+    size_t offset = 0;
+
+    while (offset < data_len) {
+        if (offset + 2 > data_len) return NOSTR_ERROR_INVALID_INPUT;
+
+        uint8_t type = data[offset];
+        uint8_t length = data[offset + 1];
+        offset += 2;
+
+        if (offset + length > data_len) return NOSTR_ERROR_INVALID_INPUT;
+
+        switch (type) {
+            case TLV_SPECIAL: // pubkey
+                if (length != 32) return NOSTR_ERROR_INVALID_INPUT;
+                memcpy(nprofile->pubkey, data + offset, 32);
+                break;
+            case TLV_RELAY: // relay URL
+                {
+                    char* relay = malloc(length + 1);
+                    if (!relay) return NOSTR_ERROR_MEMORY_FAILED;
+                    memcpy(relay, data + offset, length);
+                    relay[length] = '\0';
+
+                    char** new_relays = realloc(nprofile->relays, (nprofile->relay_count + 1) * sizeof(char*));
+                    if (!new_relays) {
+                        free(relay);
+                        return NOSTR_ERROR_MEMORY_FAILED;
+                    }
+                    nprofile->relays = new_relays;
+                    nprofile->relays[nprofile->relay_count++] = relay;
+                }
+                break;
+            default:
+                // Ignore unknown types
+                break;
+        }
+        offset += length;
+    }
+
+    return NOSTR_SUCCESS;
+}
+
+// Parse nevent structured data
+static int parse_nevent_data(const uint8_t* data, size_t data_len, nostr_nevent_t* nevent) {
+    size_t offset = 0;
+
+    while (offset < data_len) {
+        if (offset + 2 > data_len) return NOSTR_ERROR_INVALID_INPUT;
+
+        uint8_t type = data[offset];
+        uint8_t length = data[offset + 1];
+        offset += 2;
+
+        if (offset + length > data_len) return NOSTR_ERROR_INVALID_INPUT;
+
+        switch (type) {
+            case TLV_SPECIAL: // event ID
+                if (length != 32) return NOSTR_ERROR_INVALID_INPUT;
+                memcpy(nevent->event_id, data + offset, 32);
+                break;
+            case TLV_RELAY: // relay URL
+                {
+                    char* relay = malloc(length + 1);
+                    if (!relay) return NOSTR_ERROR_MEMORY_FAILED;
+                    memcpy(relay, data + offset, length);
+                    relay[length] = '\0';
+
+                    char** new_relays = realloc(nevent->relays, (nevent->relay_count + 1) * sizeof(char*));
+                    if (!new_relays) {
+                        free(relay);
+                        return NOSTR_ERROR_MEMORY_FAILED;
+                    }
+                    nevent->relays = new_relays;
+                    nevent->relays[nevent->relay_count++] = relay;
+                }
+                break;
+            case TLV_AUTHOR: // author pubkey
+                if (length != 32) return NOSTR_ERROR_INVALID_INPUT;
+                nevent->author = malloc(32);
+                if (!nevent->author) return NOSTR_ERROR_MEMORY_FAILED;
+                memcpy(nevent->author, data + offset, 32);
+                break;
+            case TLV_KIND: // kind
+                if (length != 4) return NOSTR_ERROR_INVALID_INPUT;
+                nevent->kind = malloc(sizeof(int));
+                if (!nevent->kind) return NOSTR_ERROR_MEMORY_FAILED;
+                *nevent->kind = (data[offset] << 24) | (data[offset+1] << 16) | (data[offset+2] << 8) | data[offset+3];
+                break;
+            case TLV_CREATED_AT: // created_at
+                if (length != 8) return NOSTR_ERROR_INVALID_INPUT;
+                nevent->created_at = malloc(sizeof(time_t));
+                if (!nevent->created_at) return NOSTR_ERROR_MEMORY_FAILED;
+                *nevent->created_at = ((time_t)data[offset] << 56) | ((time_t)data[offset+1] << 48) |
+                                     ((time_t)data[offset+2] << 40) | ((time_t)data[offset+3] << 32) |
+                                     ((time_t)data[offset+4] << 24) | ((time_t)data[offset+5] << 16) |
+                                     ((time_t)data[offset+6] << 8) | (time_t)data[offset+7];
+                break;
+            default:
+                // Ignore unknown types
+                break;
+        }
+        offset += length;
+    }
+
+    return NOSTR_SUCCESS;
+}
+
+// Parse naddr structured data
+static int parse_naddr_data(const uint8_t* data, size_t data_len, nostr_naddr_t* naddr) {
+    size_t offset = 0;
+
+    while (offset < data_len) {
+        if (offset + 2 > data_len) return NOSTR_ERROR_INVALID_INPUT;
+
+        uint8_t type = data[offset];
+        uint8_t length = data[offset + 1];
+        offset += 2;
+
+        if (offset + length > data_len) return NOSTR_ERROR_INVALID_INPUT;
+
+        switch (type) {
+            case TLV_IDENTIFIER: // identifier
+                naddr->identifier = malloc(length + 1);
+                if (!naddr->identifier) return NOSTR_ERROR_MEMORY_FAILED;
+                memcpy(naddr->identifier, data + offset, length);
+                naddr->identifier[length] = '\0';
+                break;
+            case TLV_SPECIAL: // pubkey
+                if (length != 32) return NOSTR_ERROR_INVALID_INPUT;
+                memcpy(naddr->pubkey, data + offset, 32);
+                break;
+            case TLV_KIND: // kind
+                if (length != 4) return NOSTR_ERROR_INVALID_INPUT;
+                naddr->kind = (data[offset] << 24) | (data[offset+1] << 16) | (data[offset+2] << 8) | data[offset+3];
+                break;
+            case TLV_RELAY: // relay URL
+                {
+                    char* relay = malloc(length + 1);
+                    if (!relay) return NOSTR_ERROR_MEMORY_FAILED;
+                    memcpy(relay, data + offset, length);
+                    relay[length] = '\0';
+
+                    char** new_relays = realloc(naddr->relays, (naddr->relay_count + 1) * sizeof(char*));
+                    if (!new_relays) {
+                        free(relay);
+                        return NOSTR_ERROR_MEMORY_FAILED;
+                    }
+                    naddr->relays = new_relays;
+                    naddr->relays[naddr->relay_count++] = relay;
+                }
+                break;
+            default:
+                // Ignore unknown types
+                break;
+        }
+        offset += length;
+    }
+
+    return NOSTR_SUCCESS;
+}
+
+
+// URI construction functions
+
+int nostr_build_uri_npub(const unsigned char* pubkey, char* output, size_t output_size) {
+    if (!pubkey || !output || output_size < 70) {
+        return NOSTR_ERROR_INVALID_INPUT;
+    }
+
+    char bech32[100];
+    int ret = nostr_key_to_bech32(pubkey, "npub", bech32);
+    if (ret != NOSTR_SUCCESS) return ret;
+
+    size_t len = strlen(bech32);
+    if (len + 7 >= output_size) return NOSTR_ERROR_INVALID_INPUT;
+
+    strcpy(output, "nostr:");
+    strcpy(output + 6, bech32);
+    return NOSTR_SUCCESS;
+}
+
+int nostr_build_uri_nsec(const unsigned char* privkey, char* output, size_t output_size) {
+    if (!privkey || !output || output_size < 70) {
+        return NOSTR_ERROR_INVALID_INPUT;
+    }
+
+    char bech32[100];
+    int ret = nostr_key_to_bech32(privkey, "nsec", bech32);
+    if (ret != NOSTR_SUCCESS) return ret;
+
+    size_t len = strlen(bech32);
+    if (len + 7 >= output_size) return NOSTR_ERROR_INVALID_INPUT;
+
+    strcpy(output, "nostr:");
+    strcpy(output + 6, bech32);
+    return NOSTR_SUCCESS;
+}
+
+// Helper to build URI with prefix
+static int build_uri_with_prefix(const char* bech32, char* output, size_t output_size) {
+    size_t len = strlen(bech32);
+    if (len + 7 >= output_size) return NOSTR_ERROR_INVALID_INPUT;
+
+    strcpy(output, "nostr:");
+    strcpy(output + 6, bech32);
+    return NOSTR_SUCCESS;
+}
+
+int nostr_build_uri_note(const unsigned char* event_id, char* output, size_t output_size) {
+    if (!event_id || !output || output_size < 70) {
+        return NOSTR_ERROR_INVALID_INPUT;
+    }
+
+    char bech32[100];
+    int ret = encode_structured_bech32("note", event_id, 32, bech32, sizeof(bech32));
+    if (ret != NOSTR_SUCCESS) return ret;
+
+    return build_uri_with_prefix(bech32, output, output_size);
+}
+
+int nostr_build_uri_nprofile(const unsigned char* pubkey, const char** relays, int relay_count,
+                            char* output, size_t output_size) {
+    if (!pubkey || !output) return NOSTR_ERROR_INVALID_INPUT;
+
+    // Build TLV data
+    uint8_t* data = NULL;
+    size_t data_len = 0;
+
+    // Add pubkey (special)
+    uint8_t* pubkey_tlv;
+    size_t pubkey_tlv_len;
+    if (!tlv_encode(pubkey, 32, TLV_SPECIAL, &pubkey_tlv, &pubkey_tlv_len)) {
+        return NOSTR_ERROR_INVALID_INPUT;
+    }
+
+    data = realloc(data, data_len + pubkey_tlv_len);
+    if (!data) {
+        free(pubkey_tlv);
+        return NOSTR_ERROR_MEMORY_FAILED;
+    }
+    memcpy(data + data_len, pubkey_tlv, pubkey_tlv_len);
+    data_len += pubkey_tlv_len;
+    free(pubkey_tlv);
+
+    // Add relays
+    for (int i = 0; i < relay_count; i++) {
+        size_t relay_len = strlen(relays[i]);
+        uint8_t* relay_tlv;
+        size_t relay_tlv_len;
+        if (!tlv_encode((uint8_t*)relays[i], relay_len, TLV_RELAY, &relay_tlv, &relay_tlv_len)) {
+            free(data);
+            return NOSTR_ERROR_INVALID_INPUT;
+        }
+
+        data = realloc(data, data_len + relay_tlv_len);
+        if (!data) {
+            free(relay_tlv);
+            return NOSTR_ERROR_MEMORY_FAILED;
+        }
+        memcpy(data + data_len, relay_tlv, relay_tlv_len);
+        data_len += relay_tlv_len;
+        free(relay_tlv);
+    }
+
+    // Encode to bech32
+    char bech32[500];
+    int ret = encode_structured_bech32("nprofile", data, data_len, bech32, sizeof(bech32));
+    free(data);
+    if (ret != NOSTR_SUCCESS) return ret;
+
+    return build_uri_with_prefix(bech32, output, output_size);
+}
+
+int nostr_build_uri_nevent(const unsigned char* event_id, const char** relays, int relay_count,
+                          const unsigned char* author, int kind, time_t created_at,
+                          char* output, size_t output_size) {
+    if (!event_id || !output) return NOSTR_ERROR_INVALID_INPUT;
+
+    // Build TLV data
+    uint8_t* data = NULL;
+    size_t data_len = 0;
+
+    // Add event_id (special)
+    uint8_t* event_tlv;
+    size_t event_tlv_len;
+    if (!tlv_encode(event_id, 32, TLV_SPECIAL, &event_tlv, &event_tlv_len)) {
+        return NOSTR_ERROR_INVALID_INPUT;
+    }
+
+    data = realloc(data, data_len + event_tlv_len);
+    if (!data) {
+        free(event_tlv);
+        return NOSTR_ERROR_MEMORY_FAILED;
+    }
+    memcpy(data + data_len, event_tlv, event_tlv_len);
+    data_len += event_tlv_len;
+    free(event_tlv);
+
+    // Add relays
+    for (int i = 0; i < relay_count; i++) {
+        size_t relay_len = strlen(relays[i]);
+        uint8_t* relay_tlv;
+        size_t relay_tlv_len;
+        if (!tlv_encode((uint8_t*)relays[i], relay_len, TLV_RELAY, &relay_tlv, &relay_tlv_len)) {
+            free(data);
+            return NOSTR_ERROR_INVALID_INPUT;
+        }
+
+        data = realloc(data, data_len + relay_tlv_len);
+        if (!data) {
+            free(relay_tlv);
+            return NOSTR_ERROR_MEMORY_FAILED;
+        }
+        memcpy(data + data_len, relay_tlv, relay_tlv_len);
+        data_len += relay_tlv_len;
+        free(relay_tlv);
+    }
+
+    // Add author if provided
+    if (author) {
+        uint8_t* author_tlv;
+        size_t author_tlv_len;
+        if (!tlv_encode(author, 32, TLV_AUTHOR, &author_tlv, &author_tlv_len)) {
+            free(data);
+            return NOSTR_ERROR_INVALID_INPUT;
+        }
+
+        data = realloc(data, data_len + author_tlv_len);
+        if (!data) {
+            free(author_tlv);
+            return NOSTR_ERROR_MEMORY_FAILED;
+        }
+        memcpy(data + data_len, author_tlv, author_tlv_len);
+        data_len += author_tlv_len;
+        free(author_tlv);
+    }
+
+    // Add kind if provided
+    if (kind >= 0) {
+        uint8_t kind_bytes[4];
+        kind_bytes[0] = (kind >> 24) & 0xFF;
+        kind_bytes[1] = (kind >> 16) & 0xFF;
+        kind_bytes[2] = (kind >> 8) & 0xFF;
+        kind_bytes[3] = kind & 0xFF;
+
+        uint8_t* kind_tlv;
+        size_t kind_tlv_len;
+        if (!tlv_encode(kind_bytes, 4, TLV_KIND, &kind_tlv, &kind_tlv_len)) {
+            free(data);
+            return NOSTR_ERROR_INVALID_INPUT;
+        }
+
+        data = realloc(data, data_len + kind_tlv_len);
+        if (!data) {
+            free(kind_tlv);
+            return NOSTR_ERROR_MEMORY_FAILED;
+        }
+        memcpy(data + data_len, kind_tlv, kind_tlv_len);
+        data_len += kind_tlv_len;
+        free(kind_tlv);
+    }
+
+    // Add created_at if provided
+    if (created_at > 0) {
+        uint8_t time_bytes[8];
+        time_bytes[0] = (created_at >> 56) & 0xFF;
+        time_bytes[1] = (created_at >> 48) & 0xFF;
+        time_bytes[2] = (created_at >> 40) & 0xFF;
+        time_bytes[3] = (created_at >> 32) & 0xFF;
+        time_bytes[4] = (created_at >> 24) & 0xFF;
+        time_bytes[5] = (created_at >> 16) & 0xFF;
+        time_bytes[6] = (created_at >> 8) & 0xFF;
+        time_bytes[7] = created_at & 0xFF;
+
+        uint8_t* time_tlv;
+        size_t time_tlv_len;
+        if (!tlv_encode(time_bytes, 8, TLV_CREATED_AT, &time_tlv, &time_tlv_len)) {
+            free(data);
+            return NOSTR_ERROR_INVALID_INPUT;
+        }
+
+        data = realloc(data, data_len + time_tlv_len);
+        if (!data) {
+            free(time_tlv);
+            return NOSTR_ERROR_MEMORY_FAILED;
+        }
+        memcpy(data + data_len, time_tlv, time_tlv_len);
+        data_len += time_tlv_len;
+        free(time_tlv);
+    }
+
+    // Encode to bech32
+    char bech32[1000];
+    int ret = encode_structured_bech32("nevent", data, data_len, bech32, sizeof(bech32));
+    free(data);
+    if (ret != NOSTR_SUCCESS) return ret;
+
+    return build_uri_with_prefix(bech32, output, output_size);
+}
+
+int nostr_build_uri_naddr(const char* identifier, const unsigned char* pubkey, int kind,
+                         const char** relays, int relay_count, char* output, size_t output_size) {
+    if (!identifier || !pubkey || !output) return NOSTR_ERROR_INVALID_INPUT;
+
+    // Build TLV data
+    uint8_t* data = NULL;
+    size_t data_len = 0;
+
+    // Add identifier
+    size_t id_len = strlen(identifier);
+    uint8_t* id_tlv;
+    size_t id_tlv_len;
+    if (!tlv_encode((uint8_t*)identifier, id_len, TLV_IDENTIFIER, &id_tlv, &id_tlv_len)) {
+        return NOSTR_ERROR_INVALID_INPUT;
+    }
+
+    data = realloc(data, data_len + id_tlv_len);
+    if (!data) {
+        free(id_tlv);
+        return NOSTR_ERROR_MEMORY_FAILED;
+    }
+    memcpy(data + data_len, id_tlv, id_tlv_len);
+    data_len += id_tlv_len;
+    free(id_tlv);
+
+    // Add pubkey (special)
+    uint8_t* pubkey_tlv;
+    size_t pubkey_tlv_len;
+    if (!tlv_encode(pubkey, 32, TLV_SPECIAL, &pubkey_tlv, &pubkey_tlv_len)) {
+        free(data);
+        return NOSTR_ERROR_INVALID_INPUT;
+    }
+
+    data = realloc(data, data_len + pubkey_tlv_len);
+    if (!data) {
+        free(pubkey_tlv);
+        return NOSTR_ERROR_MEMORY_FAILED;
+    }
+    memcpy(data + data_len, pubkey_tlv, pubkey_tlv_len);
+    data_len += pubkey_tlv_len;
+    free(pubkey_tlv);
+
+    // Add kind
+    uint8_t kind_bytes[4];
+    kind_bytes[0] = (kind >> 24) & 0xFF;
+    kind_bytes[1] = (kind >> 16) & 0xFF;
+    kind_bytes[2] = (kind >> 8) & 0xFF;
+    kind_bytes[3] = kind & 0xFF;
+
+    uint8_t* kind_tlv;
+    size_t kind_tlv_len;
+    if (!tlv_encode(kind_bytes, 4, TLV_KIND, &kind_tlv, &kind_tlv_len)) {
+        free(data);
+        return NOSTR_ERROR_INVALID_INPUT;
+    }
+
+    data = realloc(data, data_len + kind_tlv_len);
+    if (!data) {
+        free(kind_tlv);
+        return NOSTR_ERROR_MEMORY_FAILED;
+    }
+    memcpy(data + data_len, kind_tlv, kind_tlv_len);
+    data_len += kind_tlv_len;
+    free(kind_tlv);
+
+    // Add relays
+    for (int i = 0; i < relay_count; i++) {
+        size_t relay_len = strlen(relays[i]);
+        uint8_t* relay_tlv;
+        size_t relay_tlv_len;
+        if (!tlv_encode((uint8_t*)relays[i], relay_len, TLV_RELAY, &relay_tlv, &relay_tlv_len)) {
+            free(data);
+            return NOSTR_ERROR_INVALID_INPUT;
+        }
+
+        data = realloc(data, data_len + relay_tlv_len);
+        if (!data) {
+            free(relay_tlv);
+            return NOSTR_ERROR_MEMORY_FAILED;
+        }
+        memcpy(data + data_len, relay_tlv, relay_tlv_len);
+        data_len += relay_tlv_len;
+        free(relay_tlv);
+    }
+
+    // Encode to bech32
+    char bech32[1000];
+    int ret = encode_structured_bech32("naddr", data, data_len, bech32, sizeof(bech32));
+    free(data);
+    if (ret != NOSTR_SUCCESS) return ret;
+
+    return build_uri_with_prefix(bech32, output, output_size);
+}
@@ -0,0 +1,81 @@
+/*
+ * NOSTR Core Library - NIP-021: nostr: URI scheme
+ */
+
+#ifndef NIP021_H
+#define NIP021_H
+
+#include <stdint.h>
+#include <time.h>
+#include "nip001.h"
+
+// URI type enumeration
+typedef enum {
+    NOSTR_URI_NPUB,      // Simple 32-byte pubkey
+    NOSTR_URI_NSEC,      // Simple 32-byte privkey
+    NOSTR_URI_NOTE,      // Simple 32-byte event ID
+    NOSTR_URI_NPROFILE,  // Structured: pubkey + relays
+    NOSTR_URI_NEVENT,    // Structured: event ID + relays + metadata
+    NOSTR_URI_NADDR,     // Structured: address + relays + metadata
+    NOSTR_URI_INVALID
+} nostr_uri_type_t;
+
+// Structured data types for complex URIs
+typedef struct {
+    unsigned char pubkey[32];
+    char** relays;
+    int relay_count;
+} nostr_nprofile_t;
+
+typedef struct {
+    unsigned char event_id[32];
+    char** relays;
+    int relay_count;
+    unsigned char* author;     // Optional, 32 bytes if present
+    int* kind;                 // Optional
+    time_t* created_at;        // Optional
+} nostr_nevent_t;
+
+typedef struct {
+    char* identifier;
+    unsigned char pubkey[32];
+    int kind;
+    char** relays;
+    int relay_count;
+} nostr_naddr_t;
+
+// Unified URI result structure
+typedef struct {
+    nostr_uri_type_t type;
+    union {
+        unsigned char pubkey[32];      // For NPUB
+        unsigned char privkey[32];     // For NSEC
+        unsigned char event_id[32];    // For NOTE
+        nostr_nprofile_t nprofile;      // For NPROFILE
+        nostr_nevent_t nevent;         // For NEVENT
+        nostr_naddr_t naddr;           // For NADDR
+    } data;
+} nostr_uri_result_t;
+
+// Function declarations
+
+// Main parsing function - unified entry point
+int nostr_parse_uri(const char* uri, nostr_uri_result_t* result);
+
+// URI construction functions
+int nostr_build_uri_npub(const unsigned char* pubkey, char* output, size_t output_size);
+int nostr_build_uri_nsec(const unsigned char* privkey, char* output, size_t output_size);
+int nostr_build_uri_note(const unsigned char* event_id, char* output, size_t output_size);
+int nostr_build_uri_nprofile(const unsigned char* pubkey, const char** relays, int relay_count,
+                            char* output, size_t output_size);
+int nostr_build_uri_nevent(const unsigned char* event_id, const char** relays, int relay_count,
+                          const unsigned char* author, int kind, time_t created_at,
+                          char* output, size_t output_size);
+int nostr_build_uri_naddr(const char* identifier, const unsigned char* pubkey, int kind,
+                         const char** relays, int relay_count, char* output, size_t output_size);
+
+// Utility functions
+void nostr_uri_result_free(nostr_uri_result_t* result);
+nostr_uri_type_t nostr_detect_uri_type(const char* uri);
+
+#endif // NIP021_H
@@ -0,0 +1,628 @@
+/*
+ * NOSTR Core Library - NIP-042: Authentication of clients to relays
+ * 
+ * Implements client authentication through signed ephemeral events
+ */
+
+#include "nip042.h"
+#include "nip001.h"
+#include "utils.h"
+#include "../cjson/cJSON.h"
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <time.h>
+
+// Forward declarations for crypto functions
+int nostr_secp256k1_get_random_bytes(unsigned char* buf, size_t len);
+
+// =============================================================================
+// CLIENT-SIDE FUNCTIONS
+// =============================================================================
+
+/**
+ * Create NIP-42 authentication event (kind 22242)
+ */
+cJSON* nostr_nip42_create_auth_event(const char* challenge, 
+                                      const char* relay_url,
+                                      const unsigned char* private_key,
+                                      time_t timestamp) {
+    if (!challenge || !relay_url || !private_key) {
+        return NULL;
+    }
+
+    // Validate challenge format
+    size_t challenge_len = strlen(challenge);
+    if (challenge_len < NOSTR_NIP42_MIN_CHALLENGE_LENGTH || 
+        challenge_len >= NOSTR_NIP42_MAX_CHALLENGE_LENGTH) {
+        return NULL;
+    }
+
+    // Create tags array with relay and challenge
+    cJSON* tags = cJSON_CreateArray();
+    if (!tags) {
+        return NULL;
+    }
+
+    // Add relay tag
+    cJSON* relay_tag = cJSON_CreateArray();
+    if (!relay_tag) {
+        cJSON_Delete(tags);
+        return NULL;
+    }
+    cJSON_AddItemToArray(relay_tag, cJSON_CreateString("relay"));
+    cJSON_AddItemToArray(relay_tag, cJSON_CreateString(relay_url));
+    cJSON_AddItemToArray(tags, relay_tag);
+
+    // Add challenge tag
+    cJSON* challenge_tag = cJSON_CreateArray();
+    if (!challenge_tag) {
+        cJSON_Delete(tags);
+        return NULL;
+    }
+    cJSON_AddItemToArray(challenge_tag, cJSON_CreateString("challenge"));
+    cJSON_AddItemToArray(challenge_tag, cJSON_CreateString(challenge));
+    cJSON_AddItemToArray(tags, challenge_tag);
+
+    // Create authentication event using existing function
+    // Note: Empty content as per NIP-42 specification
+    cJSON* auth_event = nostr_create_and_sign_event(
+        NOSTR_NIP42_AUTH_EVENT_KIND,
+        "",  // Empty content
+        tags,
+        private_key,
+        timestamp
+    );
+
+    cJSON_Delete(tags);
+    return auth_event;
+}
+
+/**
+ * Create AUTH message JSON for relay communication
+ */
+char* nostr_nip42_create_auth_message(cJSON* auth_event) {
+    if (!auth_event) {
+        return NULL;
+    }
+
+    // Create AUTH message array: ["AUTH", <event-json>]
+    cJSON* message_array = cJSON_CreateArray();
+    if (!message_array) {
+        return NULL;
+    }
+
+    cJSON_AddItemToArray(message_array, cJSON_CreateString("AUTH"));
+    cJSON_AddItemToArray(message_array, cJSON_Duplicate(auth_event, 1));
+
+    char* message_string = cJSON_PrintUnformatted(message_array);
+    cJSON_Delete(message_array);
+
+    return message_string;
+}
+
+/**
+ * Validate challenge string format and freshness
+ */
+int nostr_nip42_validate_challenge(const char* challenge, 
+                                   time_t received_at,
+                                   int time_tolerance) {
+    if (!challenge) {
+        return NOSTR_ERROR_INVALID_INPUT;
+    }
+
+    size_t challenge_len = strlen(challenge);
+    
+    // Check challenge length
+    if (challenge_len < NOSTR_NIP42_MIN_CHALLENGE_LENGTH) {
+        return NOSTR_ERROR_NIP42_CHALLENGE_TOO_SHORT;
+    }
+    if (challenge_len >= NOSTR_NIP42_MAX_CHALLENGE_LENGTH) {
+        return NOSTR_ERROR_NIP42_CHALLENGE_TOO_LONG;
+    }
+
+    // Check time validity if provided
+    if (received_at > 0) {
+        time_t now = time(NULL);
+        int tolerance = (time_tolerance > 0) ? time_tolerance : NOSTR_NIP42_DEFAULT_TIME_TOLERANCE;
+        
+        if (now - received_at > tolerance) {
+            return NOSTR_ERROR_NIP42_CHALLENGE_EXPIRED;
+        }
+    }
+
+    return NOSTR_SUCCESS;
+}
+
+/**
+ * Parse AUTH challenge message from relay
+ */
+int nostr_nip42_parse_auth_challenge(const char* message,
+                                     char* challenge_out,
+                                     size_t challenge_size) {
+    if (!message || !challenge_out || challenge_size == 0) {
+        return NOSTR_ERROR_INVALID_INPUT;
+    }
+
+    cJSON* json = cJSON_Parse(message);
+    if (!json || !cJSON_IsArray(json)) {
+        if (json) cJSON_Delete(json);
+        return NOSTR_ERROR_NIP42_INVALID_MESSAGE_FORMAT;
+    }
+
+    // Check array has exactly 2 elements
+    if (cJSON_GetArraySize(json) != 2) {
+        cJSON_Delete(json);
+        return NOSTR_ERROR_NIP42_INVALID_MESSAGE_FORMAT;
+    }
+
+    // Check first element is "AUTH"
+    cJSON* message_type = cJSON_GetArrayItem(json, 0);
+    if (!message_type || !cJSON_IsString(message_type) || 
+        strcmp(cJSON_GetStringValue(message_type), "AUTH") != 0) {
+        cJSON_Delete(json);
+        return NOSTR_ERROR_NIP42_INVALID_MESSAGE_FORMAT;
+    }
+
+    // Get challenge string
+    cJSON* challenge_item = cJSON_GetArrayItem(json, 1);
+    if (!challenge_item || !cJSON_IsString(challenge_item)) {
+        cJSON_Delete(json);
+        return NOSTR_ERROR_NIP42_INVALID_MESSAGE_FORMAT;
+    }
+
+    const char* challenge_str = cJSON_GetStringValue(challenge_item);
+    if (!challenge_str || strlen(challenge_str) >= challenge_size) {
+        cJSON_Delete(json);
+        return NOSTR_ERROR_NIP42_INVALID_CHALLENGE;
+    }
+
+    strcpy(challenge_out, challenge_str);
+    cJSON_Delete(json);
+
+    return NOSTR_SUCCESS;
+}
+
+// =============================================================================
+// SERVER-SIDE FUNCTIONS
+// =============================================================================
+
+/**
+ * Generate cryptographically secure challenge string
+ */
+int nostr_nip42_generate_challenge(char* challenge_out, size_t length) {
+    if (!challenge_out || length < NOSTR_NIP42_MIN_CHALLENGE_LENGTH || 
+        length > NOSTR_NIP42_MAX_CHALLENGE_LENGTH / 2) {
+        return NOSTR_ERROR_INVALID_INPUT;
+    }
+
+    // Generate random bytes
+    unsigned char random_bytes[NOSTR_NIP42_MAX_CHALLENGE_LENGTH / 2];
+    if (nostr_secp256k1_get_random_bytes(random_bytes, length) != 1) {
+        return NOSTR_ERROR_CRYPTO_FAILED;
+    }
+
+    // Convert to hex string (reusing existing function)
+    nostr_bytes_to_hex(random_bytes, length, challenge_out);
+
+    return NOSTR_SUCCESS;
+}
+
+/**
+ * Verify NIP-42 authentication event
+ */
+int nostr_nip42_verify_auth_event(cJSON* auth_event,
+                                  const char* expected_challenge,
+                                  const char* relay_url,
+                                  int time_tolerance) {
+    if (!auth_event || !expected_challenge || !relay_url) {
+        return NOSTR_ERROR_INVALID_INPUT;
+    }
+
+    // First validate basic event structure using existing function
+    int structure_result = nostr_validate_event_structure(auth_event);
+    if (structure_result != NOSTR_SUCCESS) {
+        return structure_result;
+    }
+
+    // Validate NIP-42 specific structure
+    int nip42_structure_result = nostr_nip42_validate_auth_event_structure(
+        auth_event, relay_url, expected_challenge, time_tolerance);
+    if (nip42_structure_result != NOSTR_SUCCESS) {
+        return nip42_structure_result;
+    }
+
+    // Finally verify cryptographic signature using existing function
+    return nostr_verify_event_signature(auth_event);
+}
+
+/**
+ * Parse AUTH message from client
+ */
+int nostr_nip42_parse_auth_message(const char* message, cJSON** auth_event_out) {
+    if (!message || !auth_event_out) {
+        return NOSTR_ERROR_INVALID_INPUT;
+    }
+
+    cJSON* json = cJSON_Parse(message);
+    if (!json || !cJSON_IsArray(json)) {
+        if (json) cJSON_Delete(json);
+        return NOSTR_ERROR_NIP42_INVALID_MESSAGE_FORMAT;
+    }
+
+    // Check array has exactly 2 elements
+    if (cJSON_GetArraySize(json) != 2) {
+        cJSON_Delete(json);
+        return NOSTR_ERROR_NIP42_INVALID_MESSAGE_FORMAT;
+    }
+
+    // Check first element is "AUTH"
+    cJSON* message_type = cJSON_GetArrayItem(json, 0);
+    if (!message_type || !cJSON_IsString(message_type) || 
+        strcmp(cJSON_GetStringValue(message_type), "AUTH") != 0) {
+        cJSON_Delete(json);
+        return NOSTR_ERROR_NIP42_INVALID_MESSAGE_FORMAT;
+    }
+
+    // Get event object
+    cJSON* event_item = cJSON_GetArrayItem(json, 1);
+    if (!event_item || !cJSON_IsObject(event_item)) {
+        cJSON_Delete(json);
+        return NOSTR_ERROR_NIP42_INVALID_MESSAGE_FORMAT;
+    }
+
+    // Duplicate the event for the caller
+    *auth_event_out = cJSON_Duplicate(event_item, 1);
+    cJSON_Delete(json);
+
+    if (!*auth_event_out) {
+        return NOSTR_ERROR_MEMORY_FAILED;
+    }
+
+    return NOSTR_SUCCESS;
+}
+
+/**
+ * Create "auth-required" error response
+ */
+char* nostr_nip42_create_auth_required_message(const char* subscription_id,
+                                               const char* event_id,
+                                               const char* reason) {
+    const char* default_reason = "authentication required";
+    const char* message_reason = reason ? reason : default_reason;
+
+    cJSON* response = cJSON_CreateArray();
+    if (!response) {
+        return NULL;
+    }
+
+    if (subscription_id) {
+        // CLOSED message for subscriptions
+        cJSON_AddItemToArray(response, cJSON_CreateString("CLOSED"));
+        cJSON_AddItemToArray(response, cJSON_CreateString(subscription_id));
+        
+        char prefix_message[512];
+        snprintf(prefix_message, sizeof(prefix_message), "auth-required: %s", message_reason);
+        cJSON_AddItemToArray(response, cJSON_CreateString(prefix_message));
+    } else if (event_id) {
+        // OK message for events
+        cJSON_AddItemToArray(response, cJSON_CreateString("OK"));
+        cJSON_AddItemToArray(response, cJSON_CreateString(event_id));
+        cJSON_AddItemToArray(response, cJSON_CreateBool(0)); // false
+        
+        char prefix_message[512];
+        snprintf(prefix_message, sizeof(prefix_message), "auth-required: %s", message_reason);
+        cJSON_AddItemToArray(response, cJSON_CreateString(prefix_message));
+    } else {
+        cJSON_Delete(response);
+        return NULL;
+    }
+
+    char* message_string = cJSON_PrintUnformatted(response);
+    cJSON_Delete(response);
+
+    return message_string;
+}
+
+/**
+ * Create "restricted" error response
+ */
+char* nostr_nip42_create_restricted_message(const char* subscription_id,
+                                            const char* event_id,
+                                            const char* reason) {
+    const char* default_reason = "access restricted";
+    const char* message_reason = reason ? reason : default_reason;
+
+    cJSON* response = cJSON_CreateArray();
+    if (!response) {
+        return NULL;
+    }
+
+    if (subscription_id) {
+        // CLOSED message for subscriptions
+        cJSON_AddItemToArray(response, cJSON_CreateString("CLOSED"));
+        cJSON_AddItemToArray(response, cJSON_CreateString(subscription_id));
+        
+        char prefix_message[512];
+        snprintf(prefix_message, sizeof(prefix_message), "restricted: %s", message_reason);
+        cJSON_AddItemToArray(response, cJSON_CreateString(prefix_message));
+    } else if (event_id) {
+        // OK message for events
+        cJSON_AddItemToArray(response, cJSON_CreateString("OK"));
+        cJSON_AddItemToArray(response, cJSON_CreateString(event_id));
+        cJSON_AddItemToArray(response, cJSON_CreateBool(0)); // false
+        
+        char prefix_message[512];
+        snprintf(prefix_message, sizeof(prefix_message), "restricted: %s", message_reason);
+        cJSON_AddItemToArray(response, cJSON_CreateString(prefix_message));
+    } else {
+        cJSON_Delete(response);
+        return NULL;
+    }
+
+    char* message_string = cJSON_PrintUnformatted(response);
+    cJSON_Delete(response);
+
+    return message_string;
+}
+
+// =============================================================================
+// URL NORMALIZATION FUNCTIONS
+// =============================================================================
+
+/**
+ * Normalize relay URL for comparison
+ */
+char* nostr_nip42_normalize_url(const char* url) {
+    if (!url) {
+        return NULL;
+    }
+
+    size_t url_len = strlen(url);
+    char* normalized = malloc(url_len + 1);
+    if (!normalized) {
+        return NULL;
+    }
+
+    strcpy(normalized, url);
+
+    // Remove trailing slash
+    if (url_len > 1 && normalized[url_len - 1] == '/') {
+        normalized[url_len - 1] = '\0';
+    }
+
+    // Convert to lowercase for domain comparison
+    for (size_t i = 0; normalized[i]; i++) {
+        if (normalized[i] >= 'A' && normalized[i] <= 'Z') {
+            normalized[i] = normalized[i] + ('a' - 'A');
+        }
+    }
+
+    return normalized;
+}
+
+/**
+ * Check if two relay URLs match after normalization
+ */
+int nostr_nip42_urls_match(const char* url1, const char* url2) {
+    if (!url1 || !url2) {
+        return -1;
+    }
+
+    char* norm1 = nostr_nip42_normalize_url(url1);
+    char* norm2 = nostr_nip42_normalize_url(url2);
+
+    if (!norm1 || !norm2) {
+        free(norm1);
+        free(norm2);
+        return -1;
+    }
+
+    int result = (strcmp(norm1, norm2) == 0) ? 1 : 0;
+
+    free(norm1);
+    free(norm2);
+
+    return result;
+}
+
+// =============================================================================
+// UTILITY FUNCTIONS
+// =============================================================================
+
+/**
+ * Get string description of authentication state
+ */
+const char* nostr_nip42_auth_state_str(nostr_auth_state_t state) {
+    switch (state) {
+        case NOSTR_AUTH_STATE_NONE:
+            return "none";
+        case NOSTR_AUTH_STATE_CHALLENGE_RECEIVED:
+            return "challenge_received";
+        case NOSTR_AUTH_STATE_AUTHENTICATING:
+            return "authenticating";
+        case NOSTR_AUTH_STATE_AUTHENTICATED:
+            return "authenticated";
+        case NOSTR_AUTH_STATE_REJECTED:
+            return "rejected";
+        default:
+            return "unknown";
+    }
+}
+
+/**
+ * Initialize authentication context structure
+ */
+int nostr_nip42_init_auth_context(nostr_auth_context_t* ctx,
+                                  const char* relay_url,
+                                  const char* challenge,
+                                  int time_tolerance) {
+    if (!ctx || !relay_url || !challenge) {
+        return NOSTR_ERROR_INVALID_INPUT;
+    }
+
+    memset(ctx, 0, sizeof(nostr_auth_context_t));
+
+    ctx->relay_url = malloc(strlen(relay_url) + 1);
+    if (!ctx->relay_url) {
+        return NOSTR_ERROR_MEMORY_FAILED;
+    }
+    strcpy(ctx->relay_url, relay_url);
+
+    ctx->challenge = malloc(strlen(challenge) + 1);
+    if (!ctx->challenge) {
+        free(ctx->relay_url);
+        ctx->relay_url = NULL;
+        return NOSTR_ERROR_MEMORY_FAILED;
+    }
+    strcpy(ctx->challenge, challenge);
+
+    ctx->timestamp = time(NULL);
+    ctx->time_tolerance = (time_tolerance > 0) ? time_tolerance : NOSTR_NIP42_DEFAULT_TIME_TOLERANCE;
+
+    return NOSTR_SUCCESS;
+}
+
+/**
+ * Free authentication context structure
+ */
+void nostr_nip42_free_auth_context(nostr_auth_context_t* ctx) {
+    if (!ctx) {
+        return;
+    }
+
+    free(ctx->relay_url);
+    free(ctx->challenge);
+    free(ctx->pubkey_hex);
+
+    memset(ctx, 0, sizeof(nostr_auth_context_t));
+}
+
+/**
+ * Validate authentication event structure (without signature verification)
+ */
+int nostr_nip42_validate_auth_event_structure(cJSON* auth_event,
+                                              const char* relay_url,
+                                              const char* challenge,
+                                              int time_tolerance) {
+    if (!auth_event || !relay_url || !challenge) {
+        return NOSTR_ERROR_INVALID_INPUT;
+    }
+
+    // Check event kind is 22242
+    cJSON* kind_item = cJSON_GetObjectItem(auth_event, "kind");
+    if (!kind_item || !cJSON_IsNumber(kind_item) || 
+        (int)cJSON_GetNumberValue(kind_item) != NOSTR_NIP42_AUTH_EVENT_KIND) {
+        return NOSTR_ERROR_NIP42_AUTH_EVENT_INVALID;
+    }
+
+    // Check timestamp is within tolerance
+    cJSON* created_at_item = cJSON_GetObjectItem(auth_event, "created_at");
+    if (!created_at_item || !cJSON_IsNumber(created_at_item)) {
+        return NOSTR_ERROR_EVENT_INVALID_CREATED_AT;
+    }
+
+    time_t event_time = (time_t)cJSON_GetNumberValue(created_at_item);
+    time_t now = time(NULL);
+    int tolerance = (time_tolerance > 0) ? time_tolerance : NOSTR_NIP42_DEFAULT_TIME_TOLERANCE;
+    
+    if (abs((int)(now - event_time)) > tolerance) {
+        return NOSTR_ERROR_NIP42_TIME_TOLERANCE;
+    }
+
+    // Check tags contain required relay and challenge
+    cJSON* tags_item = cJSON_GetObjectItem(auth_event, "tags");
+    if (!tags_item || !cJSON_IsArray(tags_item)) {
+        return NOSTR_ERROR_EVENT_INVALID_TAGS;
+    }
+
+    int found_relay = 0, found_challenge = 0;
+
+    cJSON* tag_item;
+    cJSON_ArrayForEach(tag_item, tags_item) {
+        if (!cJSON_IsArray(tag_item) || cJSON_GetArraySize(tag_item) < 2) {
+            continue;
+        }
+
+        cJSON* tag_name = cJSON_GetArrayItem(tag_item, 0);
+        cJSON* tag_value = cJSON_GetArrayItem(tag_item, 1);
+
+        if (!cJSON_IsString(tag_name) || !cJSON_IsString(tag_value)) {
+            continue;
+        }
+
+        const char* name = cJSON_GetStringValue(tag_name);
+        const char* value = cJSON_GetStringValue(tag_value);
+
+        if (strcmp(name, "relay") == 0) {
+            if (nostr_nip42_urls_match(value, relay_url) == 1) {
+                found_relay = 1;
+            }
+        } else if (strcmp(name, "challenge") == 0) {
+            if (strcmp(value, challenge) == 0) {
+                found_challenge = 1;
+            }
+        }
+    }
+
+    if (!found_relay) {
+        return NOSTR_ERROR_NIP42_URL_MISMATCH;
+    }
+
+    if (!found_challenge) {
+        return NOSTR_ERROR_NIP42_INVALID_CHALLENGE;
+    }
+
+    return NOSTR_SUCCESS;
+}
+
+// =============================================================================
+// WEBSOCKET CLIENT INTEGRATION STUB FUNCTIONS
+// =============================================================================
+// Note: These will need to be implemented when WebSocket client structure is available
+
+int nostr_ws_authenticate(struct nostr_ws_client* client,
+                         const unsigned char* private_key,
+                         int time_tolerance) {
+    // TODO: Implement when WebSocket client structure is available
+    (void)client;
+    (void)private_key;
+    (void)time_tolerance;
+    return NOSTR_ERROR_NETWORK_FAILED; // Placeholder
+}
+
+nostr_auth_state_t nostr_ws_get_auth_state(struct nostr_ws_client* client) {
+    // TODO: Implement when WebSocket client structure is available
+    (void)client;
+    return NOSTR_AUTH_STATE_NONE; // Placeholder
+}
+
+int nostr_ws_has_valid_challenge(struct nostr_ws_client* client) {
+    // TODO: Implement when WebSocket client structure is available
+    (void)client;
+    return 0; // Placeholder
+}
+
+int nostr_ws_get_challenge(struct nostr_ws_client* client,
+                          char* challenge_out,
+                          size_t challenge_size) {
+    // TODO: Implement when WebSocket client structure is available
+    (void)client;
+    (void)challenge_out;
+    (void)challenge_size;
+    return NOSTR_ERROR_NETWORK_FAILED; // Placeholder
+}
+
+int nostr_ws_store_challenge(struct nostr_ws_client* client,
+                            const char* challenge) {
+    // TODO: Implement when WebSocket client structure is available
+    (void)client;
+    (void)challenge;
+    return NOSTR_ERROR_NETWORK_FAILED; // Placeholder
+}
+
+int nostr_ws_clear_auth_state(struct nostr_ws_client* client) {
+    // TODO: Implement when WebSocket client structure is available
+    (void)client;
+    return NOSTR_ERROR_NETWORK_FAILED; // Placeholder
+}
@@ -0,0 +1,281 @@
+/*
+ * NOSTR Core Library - NIP-042: Authentication of clients to relays
+ * 
+ * Implements client authentication through signed ephemeral events
+ */
+
+#ifndef NIP042_H
+#define NIP042_H
+
+#include <stddef.h>
+#include <stdint.h>
+#include <time.h>
+#include "../cjson/cJSON.h"
+#include "nostr_common.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+// =============================================================================
+// NIP-42 CONSTANTS AND DEFINITIONS
+// =============================================================================
+
+#define NOSTR_NIP42_AUTH_EVENT_KIND 22242
+#define NOSTR_NIP42_DEFAULT_CHALLENGE_LENGTH 32
+#define NOSTR_NIP42_DEFAULT_TIME_TOLERANCE 600  // 10 minutes in seconds
+#define NOSTR_NIP42_MAX_CHALLENGE_LENGTH 256
+#define NOSTR_NIP42_MIN_CHALLENGE_LENGTH 16
+
+// Authentication states for WebSocket client integration
+typedef enum {
+    NOSTR_AUTH_STATE_NONE = 0,               // No authentication attempted
+    NOSTR_AUTH_STATE_CHALLENGE_RECEIVED = 1,  // Challenge received from relay
+    NOSTR_AUTH_STATE_AUTHENTICATING = 2,      // AUTH event sent, waiting for OK
+    NOSTR_AUTH_STATE_AUTHENTICATED = 3,       // Successfully authenticated
+    NOSTR_AUTH_STATE_REJECTED = 4            // Authentication rejected
+} nostr_auth_state_t;
+
+// Challenge storage structure
+typedef struct {
+    char challenge[NOSTR_NIP42_MAX_CHALLENGE_LENGTH];
+    time_t received_at;
+    int is_valid;
+} nostr_auth_challenge_t;
+
+// Authentication context for relay verification
+typedef struct {
+    char* relay_url;
+    char* challenge;
+    time_t timestamp;
+    int time_tolerance;
+    char* pubkey_hex;
+} nostr_auth_context_t;
+
+// =============================================================================
+// CLIENT-SIDE FUNCTIONS (for nostr clients)
+// =============================================================================
+
+/**
+ * Create NIP-42 authentication event (kind 22242)
+ * @param challenge Challenge string received from relay
+ * @param relay_url Relay URL (normalized)
+ * @param private_key 32-byte private key for signing
+ * @param timestamp Event timestamp (0 for current time)
+ * @return cJSON event object or NULL on error
+ */
+cJSON* nostr_nip42_create_auth_event(const char* challenge, 
+                                      const char* relay_url,
+                                      const unsigned char* private_key,
+                                      time_t timestamp);
+
+/**
+ * Create AUTH message JSON for relay communication
+ * @param auth_event Authentication event (kind 22242)
+ * @return JSON string for AUTH message or NULL on error (caller must free)
+ */
+char* nostr_nip42_create_auth_message(cJSON* auth_event);
+
+/**
+ * Validate challenge string format and freshness
+ * @param challenge Challenge string to validate
+ * @param received_at Time when challenge was received (0 for no time check)
+ * @param time_tolerance Maximum age in seconds (0 for default)
+ * @return NOSTR_SUCCESS or error code
+ */
+int nostr_nip42_validate_challenge(const char* challenge, 
+                                   time_t received_at,
+                                   int time_tolerance);
+
+/**
+ * Parse AUTH challenge message from relay
+ * @param message Raw message from relay
+ * @param challenge_out Output buffer for challenge string
+ * @param challenge_size Size of challenge buffer
+ * @return NOSTR_SUCCESS or error code
+ */
+int nostr_nip42_parse_auth_challenge(const char* message,
+                                     char* challenge_out,
+                                     size_t challenge_size);
+
+// =============================================================================
+// SERVER-SIDE FUNCTIONS (for relay implementations)
+// =============================================================================
+
+/**
+ * Generate cryptographically secure challenge string
+ * @param challenge_out Output buffer for challenge (must be at least length*2+1)
+ * @param length Desired challenge length in bytes (16-128)
+ * @return NOSTR_SUCCESS or error code
+ */
+int nostr_nip42_generate_challenge(char* challenge_out, size_t length);
+
+/**
+ * Verify NIP-42 authentication event
+ * @param auth_event Authentication event to verify
+ * @param expected_challenge Challenge that was sent to client
+ * @param relay_url Expected relay URL
+ * @param time_tolerance Maximum timestamp deviation in seconds
+ * @return NOSTR_SUCCESS or error code
+ */
+int nostr_nip42_verify_auth_event(cJSON* auth_event,
+                                  const char* expected_challenge,
+                                  const char* relay_url,
+                                  int time_tolerance);
+
+/**
+ * Parse AUTH message from client
+ * @param message Raw AUTH message from client
+ * @param auth_event_out Output pointer to parsed event (caller must free)
+ * @return NOSTR_SUCCESS or error code
+ */
+int nostr_nip42_parse_auth_message(const char* message, cJSON** auth_event_out);
+
+/**
+ * Create "auth-required" error response
+ * @param subscription_id Subscription ID (for CLOSED) or NULL (for OK)
+ * @param event_id Event ID (for OK) or NULL (for CLOSED)
+ * @param reason Human-readable reason
+ * @return JSON string for response or NULL on error (caller must free)
+ */
+char* nostr_nip42_create_auth_required_message(const char* subscription_id,
+                                               const char* event_id,
+                                               const char* reason);
+
+/**
+ * Create "restricted" error response
+ * @param subscription_id Subscription ID (for CLOSED) or NULL (for OK)
+ * @param event_id Event ID (for OK) or NULL (for CLOSED)  
+ * @param reason Human-readable reason
+ * @return JSON string for response or NULL on error (caller must free)
+ */
+char* nostr_nip42_create_restricted_message(const char* subscription_id,
+                                            const char* event_id,
+                                            const char* reason);
+
+// =============================================================================
+// URL NORMALIZATION FUNCTIONS
+// =============================================================================
+
+/**
+ * Normalize relay URL for comparison (removes trailing slashes, etc.)
+ * @param url Original URL
+ * @return Normalized URL string or NULL on error (caller must free)
+ */
+char* nostr_nip42_normalize_url(const char* url);
+
+/**
+ * Check if two relay URLs match after normalization
+ * @param url1 First URL
+ * @param url2 Second URL  
+ * @return 1 if URLs match, 0 if they don't, -1 on error
+ */
+int nostr_nip42_urls_match(const char* url1, const char* url2);
+
+// =============================================================================
+// UTILITY FUNCTIONS
+// =============================================================================
+
+/**
+ * Get string description of authentication state
+ * @param state Authentication state
+ * @return Human-readable string
+ */
+const char* nostr_nip42_auth_state_str(nostr_auth_state_t state);
+
+/**
+ * Initialize authentication context structure
+ * @param ctx Context to initialize
+ * @param relay_url Relay URL
+ * @param challenge Challenge string
+ * @param time_tolerance Time tolerance in seconds
+ * @return NOSTR_SUCCESS or error code
+ */
+int nostr_nip42_init_auth_context(nostr_auth_context_t* ctx,
+                                  const char* relay_url,
+                                  const char* challenge,
+                                  int time_tolerance);
+
+/**
+ * Free authentication context structure
+ * @param ctx Context to free
+ */
+void nostr_nip42_free_auth_context(nostr_auth_context_t* ctx);
+
+/**
+ * Validate authentication event structure (without signature verification)
+ * @param auth_event Event to validate
+ * @param relay_url Expected relay URL
+ * @param challenge Expected challenge
+ * @param time_tolerance Maximum timestamp deviation in seconds  
+ * @return NOSTR_SUCCESS or error code
+ */
+int nostr_nip42_validate_auth_event_structure(cJSON* auth_event,
+                                              const char* relay_url,
+                                              const char* challenge,
+                                              int time_tolerance);
+
+// =============================================================================
+// WEBSOCKET CLIENT INTEGRATION
+// =============================================================================
+
+// Forward declaration for WebSocket client
+struct nostr_ws_client;
+
+/**
+ * Authenticate WebSocket client with relay
+ * @param client WebSocket client handle
+ * @param private_key 32-byte private key for authentication
+ * @param time_tolerance Maximum timestamp deviation in seconds (0 for default)
+ * @return NOSTR_SUCCESS or error code
+ */
+int nostr_ws_authenticate(struct nostr_ws_client* client,
+                         const unsigned char* private_key,
+                         int time_tolerance);
+
+/**
+ * Get current authentication state of WebSocket client
+ * @param client WebSocket client handle
+ * @return Current authentication state
+ */
+nostr_auth_state_t nostr_ws_get_auth_state(struct nostr_ws_client* client);
+
+/**
+ * Check if WebSocket client has stored valid challenge
+ * @param client WebSocket client handle
+ * @return 1 if valid challenge exists, 0 otherwise
+ */
+int nostr_ws_has_valid_challenge(struct nostr_ws_client* client);
+
+/**
+ * Get stored challenge from WebSocket client
+ * @param client WebSocket client handle
+ * @param challenge_out Output buffer for challenge
+ * @param challenge_size Size of output buffer
+ * @return NOSTR_SUCCESS or error code
+ */
+int nostr_ws_get_challenge(struct nostr_ws_client* client,
+                          char* challenge_out,
+                          size_t challenge_size);
+
+/**
+ * Store challenge in WebSocket client (internal function)
+ * @param client WebSocket client handle
+ * @param challenge Challenge string to store
+ * @return NOSTR_SUCCESS or error code
+ */
+int nostr_ws_store_challenge(struct nostr_ws_client* client,
+                            const char* challenge);
+
+/**
+ * Clear authentication state in WebSocket client
+ * @param client WebSocket client handle
+ * @return NOSTR_SUCCESS or error code
+ */
+int nostr_ws_clear_auth_state(struct nostr_ws_client* client);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif // NIP042_H
@@ -0,0 +1,511 @@
+/*
+ * NIP-44: Encrypted Payloads (Versioned) Implementation
+ * https://github.com/nostr-protocol/nips/blob/master/44.md
+ */
+
+#include "nip044.h"
+#include "utils.h"
+#include "nostr_common.h"
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+// Forward declarations for crypto functions (private API)
+// These functions are implemented in crypto/ but not exposed through public headers
+int ecdh_shared_secret(const unsigned char* private_key, const unsigned char* public_key, unsigned char* shared_secret);
+int nostr_secp256k1_get_random_bytes(unsigned char* buf, size_t len);
+
+// ChaCha20 functions for NIP-44 encryption
+int chacha20_encrypt(const unsigned char key[32], unsigned int counter,
+                     const unsigned char nonce[12], const unsigned char* input,
+                     unsigned char* output, size_t length);
+
+// HKDF functions for NIP-44 key derivation
+int nostr_hkdf_extract(const unsigned char* salt, size_t salt_len,
+                       const unsigned char* ikm, size_t ikm_len,
+                       unsigned char* prk);
+int nostr_hkdf_expand(const unsigned char* prk, size_t prk_len,
+                      const unsigned char* info, size_t info_len,
+                      unsigned char* okm, size_t okm_len);
+
+// HMAC-SHA256 function for NIP-44 authentication
+int nostr_hmac_sha256(const unsigned char* key, size_t key_len,
+                      const unsigned char* data, size_t data_len,
+                      unsigned char* hmac);
+
+// Forward declarations for internal functions
+static size_t calc_padded_len(size_t unpadded_len);
+static unsigned char* pad_plaintext(const char* plaintext, size_t* padded_len);
+static char* unpad_plaintext(const unsigned char* padded, size_t padded_len);
+static int constant_time_compare(const unsigned char* a, const unsigned char* b, size_t len);
+
+// Memory clearing utility
+static void memory_clear(const void *p, size_t len) {
+    if (p && len) {
+        memset((void *)p, 0, len);
+    }
+}
+
+
+// =============================================================================
+// NIP-44 UTILITY FUNCTIONS
+// =============================================================================
+
+// Constant-time comparison (security critical)
+static int constant_time_compare(const unsigned char* a, const unsigned char* b, size_t len) {
+    unsigned char result = 0;
+    for (size_t i = 0; i < len; i++) {
+        result |= (a[i] ^ b[i]);
+    }
+    return result == 0;
+}
+
+// NIP-44 padding calculation (per spec)
+static size_t calc_padded_len(size_t unpadded_len) {
+    if (unpadded_len <= 32) {
+        return 32;
+    }
+    
+    size_t next_power = 1;
+    while (next_power < unpadded_len) {
+        next_power <<= 1;
+    }
+    
+    size_t chunk = (next_power <= 256) ? 32 : (next_power / 8);
+    return chunk * ((unpadded_len - 1) / chunk + 1);
+}
+
+// NIP-44 padding (per spec)
+static unsigned char* pad_plaintext(const char* plaintext, size_t* padded_len) {
+    size_t unpadded_len = strlen(plaintext);
+    if (unpadded_len > 65535) {
+        return NULL;
+    }
+    
+    size_t padded_content_len = calc_padded_len(unpadded_len);
+    *padded_len = padded_content_len + 2; // Add 2 bytes for the length prefix
+    unsigned char* padded = malloc(*padded_len);
+    if (!padded) return NULL;
+    
+    // Write length prefix (big-endian u16)
+    padded[0] = (unpadded_len >> 8) & 0xFF;
+    padded[1] = unpadded_len & 0xFF;
+    
+    // Copy plaintext and add zero-padding
+    memcpy(padded + 2, plaintext, unpadded_len);
+    memset(padded + 2 + unpadded_len, 0, padded_content_len - unpadded_len);
+    
+    return padded;
+}
+
+// NIP-44 unpadding (per spec)
+static char* unpad_plaintext(const unsigned char* padded, size_t padded_len) {
+    if (padded_len < 4) return NULL; 
+
+    size_t unpadded_len = (padded[0] << 8) | padded[1];
+    size_t expected_padded_len = calc_padded_len(unpadded_len);
+
+
+    if (padded_len != expected_padded_len + 2) {
+        return NULL;
+    }
+
+    if (unpadded_len > padded_len - 2) {
+        return NULL;
+    }
+
+    char* plaintext = malloc(unpadded_len + 1);
+    if (!plaintext) return NULL;
+    
+    // Handle empty message case (unpadded_len can be 0)
+    if (unpadded_len > 0) {
+        memcpy(plaintext, padded + 2, unpadded_len);
+    }
+    plaintext[unpadded_len] = '\0';
+    
+    return plaintext;
+}
+
+// =============================================================================
+// NIP-44 IMPLEMENTATION
+// =============================================================================
+
+int nostr_nip44_encrypt_with_nonce(const unsigned char* sender_private_key,
+                                  const unsigned char* recipient_public_key,
+                                  const char* plaintext,
+                                  const unsigned char* nonce,
+                                  char* output,
+                                  size_t output_size) {
+    if (!sender_private_key || !recipient_public_key || !plaintext || !nonce || !output) {
+        return NOSTR_ERROR_INVALID_INPUT;
+    }
+    
+    size_t plaintext_len = strlen(plaintext);
+    if (plaintext_len > NOSTR_NIP44_MAX_PLAINTEXT_SIZE) {
+        return NOSTR_ERROR_NIP44_BUFFER_TOO_SMALL;
+    }
+    
+    
+    // Step 1: Compute ECDH shared secret
+    unsigned char shared_secret[32];
+    if (ecdh_shared_secret(sender_private_key, recipient_public_key, shared_secret) != 0) {
+        return NOSTR_ERROR_CRYPTO_FAILED;
+    }
+    
+    // Step 2: Calculate conversation key (HKDF-extract with "nip44-v2" as salt)
+    unsigned char conversation_key[32];
+    const char* salt_str = "nip44-v2";
+    if (nostr_hkdf_extract((const unsigned char*)salt_str, strlen(salt_str),
+                          shared_secret, 32, conversation_key) != 0) {
+        memory_clear(shared_secret, 32);
+        return NOSTR_ERROR_CRYPTO_FAILED;
+    }
+    
+    // Step 3: Use provided nonce (for testing)
+    // Copy nonce for consistency with existing code structure
+    unsigned char nonce_copy[32];
+    memcpy(nonce_copy, nonce, 32);
+    
+    
+    // Step 4: Derive message keys (HKDF-expand with nonce as info)
+    unsigned char message_keys[76]; // 32 chacha_key + 12 chacha_nonce + 32 hmac_key
+    if (nostr_hkdf_expand(conversation_key, 32, nonce_copy, 32, message_keys, 76) != 0) {
+        memory_clear(shared_secret, 32);
+        memory_clear(conversation_key, 32);
+        memory_clear(nonce_copy, 32);
+        return NOSTR_ERROR_CRYPTO_FAILED;
+    }
+    
+    unsigned char* chacha_key = message_keys;
+    unsigned char* chacha_nonce = message_keys + 32;
+    unsigned char* hmac_key = message_keys + 44;
+    
+    
+    // Step 5: Pad plaintext according to NIP-44 spec
+    size_t padded_len;
+    unsigned char* padded_plaintext = pad_plaintext(plaintext, &padded_len);
+    if (!padded_plaintext) {
+        memory_clear(shared_secret, 32);
+        memory_clear(conversation_key, 32);
+        memory_clear(nonce, 32);
+        memory_clear(message_keys, 76);
+        return NOSTR_ERROR_CRYPTO_FAILED;
+    }
+    
+    // Step 6: Encrypt using ChaCha20
+    unsigned char* ciphertext = malloc(padded_len);
+    if (!ciphertext) {
+        memory_clear(shared_secret, 32);
+        memory_clear(conversation_key, 32);
+        memory_clear(nonce, 32);
+        memory_clear(message_keys, 76);
+        memory_clear(padded_plaintext, padded_len);
+        free(padded_plaintext);
+        return NOSTR_ERROR_MEMORY_FAILED;
+    }
+    
+    if (chacha20_encrypt(chacha_key, 0, chacha_nonce, padded_plaintext, ciphertext, padded_len) != 0) {
+        memory_clear(shared_secret, 32);
+        memory_clear(conversation_key, 32);
+        memory_clear(nonce, 32);
+        memory_clear(message_keys, 76);
+        memory_clear(padded_plaintext, padded_len);
+        free(padded_plaintext);
+        free(ciphertext);
+        return NOSTR_ERROR_CRYPTO_FAILED;
+    }
+    
+    // Step 7: Compute HMAC with AAD (nonce + ciphertext)
+    unsigned char* aad_data = malloc(32 + padded_len);
+    if (!aad_data) {
+        memory_clear(shared_secret, 32);
+        memory_clear(conversation_key, 32);
+        memory_clear(nonce_copy, 32);
+        memory_clear(message_keys, 76);
+        memory_clear(padded_plaintext, padded_len);
+        free(padded_plaintext);
+        free(ciphertext);
+        return NOSTR_ERROR_MEMORY_FAILED;
+    }
+    
+    memcpy(aad_data, nonce_copy, 32);
+    memcpy(aad_data + 32, ciphertext, padded_len);
+    
+    unsigned char mac[32];
+    if (nostr_hmac_sha256(hmac_key, 32, aad_data, 32 + padded_len, mac) != 0) {
+        memory_clear(shared_secret, 32);
+        memory_clear(conversation_key, 32);
+        memory_clear(nonce, 32);
+        memory_clear(message_keys, 76);
+        memory_clear(padded_plaintext, padded_len);
+        memory_clear(aad_data, 32 + padded_len);
+        free(padded_plaintext);
+        free(ciphertext);
+        free(aad_data);
+        return NOSTR_ERROR_CRYPTO_FAILED;
+    }
+    
+    // Step 8: Format as base64(version + nonce + ciphertext + mac)
+    size_t payload_len = 1 + 32 + padded_len + 32; // version + nonce + ciphertext + mac
+    unsigned char* payload = malloc(payload_len);
+    if (!payload) {
+        memory_clear(shared_secret, 32);
+        memory_clear(conversation_key, 32);
+        memory_clear(nonce, 32);
+        memory_clear(message_keys, 76);
+        memory_clear(padded_plaintext, padded_len);
+        memory_clear(aad_data, 32 + padded_len);
+        free(padded_plaintext);
+        free(ciphertext);
+        free(aad_data);
+        return NOSTR_ERROR_MEMORY_FAILED;
+    }
+    
+    payload[0] = 0x02; // NIP-44 version 2
+    memcpy(payload + 1, nonce_copy, 32);
+    memcpy(payload + 33, ciphertext, padded_len);
+    memcpy(payload + 33 + padded_len, mac, 32);
+    
+    // Base64 encode
+    size_t b64_len = ((payload_len + 2) / 3) * 4 + 1;
+    if (b64_len > output_size) {
+        memory_clear(shared_secret, 32);
+        memory_clear(conversation_key, 32);
+        memory_clear(nonce, 32);
+        memory_clear(message_keys, 76);
+        memory_clear(padded_plaintext, padded_len);
+        memory_clear(aad_data, 32 + padded_len);
+        memory_clear(payload, payload_len);
+        free(padded_plaintext);
+        free(ciphertext);
+        free(aad_data);
+        free(payload);
+        return NOSTR_ERROR_NIP44_BUFFER_TOO_SMALL;
+    }
+    
+    if (base64_encode(payload, payload_len, output, output_size) == 0) {
+        memory_clear(shared_secret, 32);
+        memory_clear(conversation_key, 32);
+        memory_clear(nonce, 32);
+        memory_clear(message_keys, 76);
+        memory_clear(padded_plaintext, padded_len);
+        memory_clear(aad_data, 32 + padded_len);
+        memory_clear(payload, payload_len);
+        free(padded_plaintext);
+        free(ciphertext);
+        free(aad_data);
+        free(payload);
+        return NOSTR_ERROR_CRYPTO_FAILED;
+    }
+    
+    // Cleanup
+    memory_clear(shared_secret, 32);
+    memory_clear(conversation_key, 32);
+    memory_clear(nonce_copy, 32);
+    memory_clear(message_keys, 76);
+    memory_clear(padded_plaintext, padded_len);
+    memory_clear(aad_data, 32 + padded_len);
+    memory_clear(payload, payload_len);
+    free(padded_plaintext);
+    free(ciphertext);
+    free(aad_data);
+    free(payload);
+    
+    return NOSTR_SUCCESS;
+}
+
+int nostr_nip44_encrypt(const unsigned char* sender_private_key,
+                       const unsigned char* recipient_public_key,
+                       const char* plaintext,
+                       char* output,
+                       size_t output_size) {
+    // Generate random nonce and call the _with_nonce version
+    unsigned char nonce[32];
+    if (nostr_secp256k1_get_random_bytes(nonce, 32) != 1) {
+        return NOSTR_ERROR_CRYPTO_FAILED;
+    }
+    
+    return nostr_nip44_encrypt_with_nonce(sender_private_key, recipient_public_key, 
+                                         plaintext, nonce, output, output_size);
+}
+
+int nostr_nip44_decrypt(const unsigned char* recipient_private_key,
+                       const unsigned char* sender_public_key,
+                       const char* encrypted_data,
+                       char* output,
+                       size_t output_size) {
+    if (!recipient_private_key || !sender_public_key || !encrypted_data || !output) {
+        return NOSTR_ERROR_INVALID_INPUT;
+    }
+    
+    // Step 1: Base64 decode the encrypted data
+    size_t max_payload_len = ((strlen(encrypted_data) + 3) / 4) * 3;
+    unsigned char* payload = malloc(max_payload_len);
+    if (!payload) {
+        return NOSTR_ERROR_MEMORY_FAILED;
+    }
+    
+    size_t payload_len = base64_decode(encrypted_data, payload);
+    if (payload_len < 66) { // Minimum: version(1) + nonce(32) + mac(32) + 1 byte ciphertext
+        free(payload);
+        return NOSTR_ERROR_NIP44_INVALID_FORMAT;
+    }
+    
+    // Step 2: Extract components (version + nonce + ciphertext + mac)
+    if (payload[0] != 0x02) { // Check NIP-44 version
+        free(payload);
+        return NOSTR_ERROR_NIP44_INVALID_FORMAT;
+    }
+    
+    unsigned char* nonce = payload + 1;
+    unsigned char* ciphertext = payload + 33;
+    unsigned char* received_mac = payload + payload_len - 32;
+    size_t ciphertext_len = (payload + payload_len - 32) - (payload + 33); // mac_start - ciphertext_start
+    
+    // Step 3: Compute ECDH shared secret
+    unsigned char shared_secret[32];
+    if (ecdh_shared_secret(recipient_private_key, sender_public_key, shared_secret) != 0) {
+        memory_clear(payload, payload_len);
+        free(payload);
+        return NOSTR_ERROR_CRYPTO_FAILED;
+    }
+    
+    // Step 4: Calculate conversation key (HKDF-extract with "nip44-v2" as salt)
+    unsigned char conversation_key[32];
+    const char* salt_str = "nip44-v2";
+    if (nostr_hkdf_extract((const unsigned char*)salt_str, strlen(salt_str),
+                          shared_secret, 32, conversation_key) != 0) {
+        memory_clear(shared_secret, 32);
+        memory_clear(payload, payload_len);
+        free(payload);
+        return NOSTR_ERROR_CRYPTO_FAILED;
+    }
+    
+    // Step 5: Derive message keys (HKDF-expand with nonce as info)
+    unsigned char message_keys[76]; // 32 chacha_key + 12 chacha_nonce + 32 hmac_key
+    if (nostr_hkdf_expand(conversation_key, 32, nonce, 32, message_keys, 76) != 0) {
+        memory_clear(shared_secret, 32);
+        memory_clear(conversation_key, 32);
+        memory_clear(payload, payload_len);
+        free(payload);
+        return NOSTR_ERROR_CRYPTO_FAILED;
+    }
+    
+    unsigned char* chacha_key = message_keys;
+    unsigned char* chacha_nonce = message_keys + 32;
+    unsigned char* hmac_key = message_keys + 44;
+    
+    // Step 6: Verify HMAC with AAD (nonce + ciphertext)
+    unsigned char* aad_data = malloc(32 + ciphertext_len);
+    if (!aad_data) {
+        memory_clear(shared_secret, 32);
+        memory_clear(conversation_key, 32);
+        memory_clear(message_keys, 76);
+        memory_clear(payload, payload_len);
+        free(payload);
+        return NOSTR_ERROR_MEMORY_FAILED;
+    }
+    
+    memcpy(aad_data, nonce, 32);
+    memcpy(aad_data + 32, ciphertext, ciphertext_len);
+    
+    unsigned char computed_mac[32];
+    if (nostr_hmac_sha256(hmac_key, 32, aad_data, 32 + ciphertext_len, computed_mac) != 0) {
+        memory_clear(shared_secret, 32);
+        memory_clear(conversation_key, 32);
+        memory_clear(message_keys, 76);
+        memory_clear(aad_data, 32 + ciphertext_len);
+        memory_clear(payload, payload_len);
+        free(aad_data);
+        free(payload);
+        return NOSTR_ERROR_CRYPTO_FAILED;
+    }
+    
+    // Constant-time MAC verification
+    // Constant-time MAC verification
+    if (!constant_time_compare(received_mac, computed_mac, 32)) {
+        memory_clear(shared_secret, 32);
+        memory_clear(conversation_key, 32);
+        memory_clear(message_keys, 76);
+        memory_clear(aad_data, 32 + ciphertext_len);
+        memory_clear(payload, payload_len);
+        free(aad_data);
+        free(payload);
+        return NOSTR_ERROR_NIP44_DECRYPT_FAILED;
+    }
+    
+    // Step 7: Decrypt using ChaCha20
+    unsigned char* padded_plaintext = malloc(ciphertext_len);
+    if (!padded_plaintext) {
+        memory_clear(shared_secret, 32);
+        memory_clear(conversation_key, 32);
+        memory_clear(message_keys, 76);
+        memory_clear(aad_data, 32 + ciphertext_len);
+        memory_clear(payload, payload_len);
+        free(aad_data);
+        free(payload);
+        return NOSTR_ERROR_MEMORY_FAILED;
+    }
+    
+    if (chacha20_encrypt(chacha_key, 0, chacha_nonce, ciphertext, padded_plaintext, ciphertext_len) != 0) {
+        memory_clear(shared_secret, 32);
+        memory_clear(conversation_key, 32);
+        memory_clear(message_keys, 76);
+        memory_clear(aad_data, 32 + ciphertext_len);
+        memory_clear(payload, payload_len);
+        free(aad_data);
+        free(payload);
+        free(padded_plaintext);
+        return NOSTR_ERROR_CRYPTO_FAILED;
+    }
+    
+    // Step 8: Remove padding according to NIP-44 spec
+    // Step 8: Remove padding according to NIP-44 spec
+    char* plaintext = unpad_plaintext(padded_plaintext, ciphertext_len);
+    if (!plaintext) {
+        memory_clear(shared_secret, 32);
+        memory_clear(conversation_key, 32);
+        memory_clear(message_keys, 76);
+        memory_clear(aad_data, 32 + ciphertext_len);
+        memory_clear(payload, payload_len);
+        memory_clear(padded_plaintext, ciphertext_len);
+        free(aad_data);
+        free(payload);
+        free(padded_plaintext);
+        return NOSTR_ERROR_NIP44_DECRYPT_FAILED;
+    }
+    
+    // Step 9: Copy to output buffer
+    size_t plaintext_len = strlen(plaintext);
+    if (plaintext_len + 1 > output_size) {
+        memory_clear(shared_secret, 32);
+        memory_clear(conversation_key, 32);
+        memory_clear(message_keys, 76);
+        memory_clear(aad_data, 32 + ciphertext_len);
+        memory_clear(payload, payload_len);
+        memory_clear(padded_plaintext, ciphertext_len);
+        memory_clear(plaintext, plaintext_len);
+        free(aad_data);
+        free(payload);
+        free(padded_plaintext);
+        free(plaintext);
+        return NOSTR_ERROR_NIP44_BUFFER_TOO_SMALL;
+    }
+    
+    strcpy(output, plaintext);
+    
+    // Cleanup
+    memory_clear(shared_secret, 32);
+    memory_clear(conversation_key, 32);
+    memory_clear(message_keys, 76);
+    memory_clear(aad_data, 32 + ciphertext_len);
+    memory_clear(payload, payload_len);
+    memory_clear(padded_plaintext, ciphertext_len);
+    memory_clear(plaintext, plaintext_len);
+    free(aad_data);
+    free(payload);
+    free(padded_plaintext);
+    free(plaintext);
+    
+    return NOSTR_SUCCESS;
+}
@@ -0,0 +1,72 @@
+/*
+ * NIP-44: Encrypted Payloads (Versioned)
+ * https://github.com/nostr-protocol/nips/blob/master/44.md
+ */
+
+#ifndef NOSTR_NIP044_H
+#define NOSTR_NIP044_H
+
+#include <stddef.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+// NIP-44 constants
+// #define NOSTR_NIP44_MAX_PLAINTEXT_SIZE 1048576
+
+/**
+ * NIP-44: Encrypt a message using ECDH + ChaCha20 + HMAC
+ * 
+ * @param sender_private_key 32-byte sender private key
+ * @param recipient_public_key 32-byte recipient public key (x-only)
+ * @param plaintext Message to encrypt
+ * @param output Buffer for encrypted output (base64 encoded)
+ * @param output_size Size of output buffer
+ * @return NOSTR_SUCCESS on success, error code on failure
+ */
+int nostr_nip44_encrypt(const unsigned char* sender_private_key,
+                       const unsigned char* recipient_public_key,
+                       const char* plaintext,
+                       char* output,
+                       size_t output_size);
+
+/**
+ * NIP-44: Encrypt a message with a specific nonce (for testing)
+ * 
+ * @param sender_private_key 32-byte sender private key
+ * @param recipient_public_key 32-byte recipient public key (x-only)
+ * @param plaintext Message to encrypt
+ * @param nonce 32-byte nonce
+ * @param output Buffer for encrypted output (base64 encoded)
+ * @param output_size Size of output buffer
+ * @return NOSTR_SUCCESS on success, error code on failure
+ */
+int nostr_nip44_encrypt_with_nonce(const unsigned char* sender_private_key,
+                                  const unsigned char* recipient_public_key,
+                                  const char* plaintext,
+                                  const unsigned char* nonce,
+                                  char* output,
+                                  size_t output_size);
+
+/**
+ * NIP-44: Decrypt a message using ECDH + ChaCha20 + HMAC
+ * 
+ * @param recipient_private_key 32-byte recipient private key
+ * @param sender_public_key 32-byte sender public key (x-only)
+ * @param encrypted_data Encrypted message (base64 encoded)
+ * @param output Buffer for decrypted plaintext
+ * @param output_size Size of output buffer
+ * @return NOSTR_SUCCESS on success, error code on failure
+ */
+int nostr_nip44_decrypt(const unsigned char* recipient_private_key,
+                       const unsigned char* sender_public_key,
+                       const char* encrypted_data,
+                       char* output,
+                       size_t output_size);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif // NOSTR_NIP044_H
@@ -0,0 +1,987 @@
+/*
+ * NIP-46: Nostr Remote Signing Implementation
+ * https://github.com/nostr-protocol/nips/blob/master/46.md
+ */
+
+#define _GNU_SOURCE
+#include "nip046.h"
+#include "nip044.h"
+#include "nip004.h"
+#include "utils.h"
+#include "nostr_common.h"
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <ctype.h>
+#include <time.h>
+
+// Forward declarations for crypto/private APIs
+int nostr_ec_public_key_from_private_key(const unsigned char* private_key, unsigned char* public_key);
+int nostr_secp256k1_get_random_bytes(unsigned char* buf, size_t len);
+
+static char* nip46_strdup(const char* s) {
+    if (!s) return NULL;
+    size_t len = strlen(s);
+    char* out = (char*)malloc(len + 1);
+    if (!out) return NULL;
+    memcpy(out, s, len + 1);
+    return out;
+}
+
+static void safe_copy(char* dst, size_t dst_size, const char* src) {
+    if (!dst || dst_size == 0) return;
+    if (!src) {
+        dst[0] = '\0';
+        return;
+    }
+
+    size_t src_len = strlen(src);
+    size_t copy_len = (src_len < (dst_size - 1U)) ? src_len : (dst_size - 1U);
+    memcpy(dst, src, copy_len);
+    dst[copy_len] = '\0';
+}
+
+static int is_hex_64(const char* s) {
+    if (!s || strlen(s) != 64) return 0;
+    for (int i = 0; i < 64; i++) {
+        if (!isxdigit((unsigned char)s[i])) return 0;
+    }
+    return 1;
+}
+
+static int hex_val(char c) {
+    if (c >= '0' && c <= '9') return c - '0';
+    if (c >= 'a' && c <= 'f') return c - 'a' + 10;
+    if (c >= 'A' && c <= 'F') return c - 'A' + 10;
+    return -1;
+}
+
+static int url_decode(const char* in, char* out, size_t out_size) {
+    if (!in || !out || out_size == 0) return NOSTR_ERROR_INVALID_INPUT;
+
+    size_t oi = 0;
+    for (size_t i = 0; in[i] != '\0'; i++) {
+        if (oi + 1 >= out_size) return NOSTR_ERROR_NIP46_INVALID_NOSTRCONNECT;
+
+        if (in[i] == '%' && in[i + 1] && in[i + 2]) {
+            int hi = hex_val(in[i + 1]);
+            int lo = hex_val(in[i + 2]);
+            if (hi < 0 || lo < 0) return NOSTR_ERROR_NIP46_INVALID_NOSTRCONNECT;
+            out[oi++] = (char)((hi << 4) | lo);
+            i += 2;
+        } else if (in[i] == '+') {
+            out[oi++] = ' ';
+        } else {
+            out[oi++] = in[i];
+        }
+    }
+
+    out[oi] = '\0';
+    return NOSTR_SUCCESS;
+}
+
+static int is_unreserved(char c) {
+    return (isalnum((unsigned char)c) || c == '-' || c == '_' || c == '.' || c == '~');
+}
+
+static int url_encode(const char* in, char* out, size_t out_size) {
+    if (!in || !out || out_size == 0) return NOSTR_ERROR_INVALID_INPUT;
+
+    static const char* HEX = "0123456789ABCDEF";
+    size_t oi = 0;
+    for (size_t i = 0; in[i] != '\0'; i++) {
+        unsigned char c = (unsigned char)in[i];
+        if (is_unreserved((char)c)) {
+            if (oi + 1 >= out_size) return NOSTR_ERROR_NIP46_INVALID_NOSTRCONNECT;
+            out[oi++] = (char)c;
+        } else {
+            if (oi + 3 >= out_size) return NOSTR_ERROR_NIP46_INVALID_NOSTRCONNECT;
+            out[oi++] = '%';
+            out[oi++] = HEX[(c >> 4) & 0x0F];
+            out[oi++] = HEX[c & 0x0F];
+        }
+    }
+    out[oi] = '\0';
+    return NOSTR_SUCCESS;
+}
+
+const char* nostr_nip46_method_to_string(nostr_nip46_method_t method) {
+    switch (method) {
+        case NOSTR_NIP46_METHOD_CONNECT: return "connect";
+        case NOSTR_NIP46_METHOD_SIGN_EVENT: return "sign_event";
+        case NOSTR_NIP46_METHOD_PING: return "ping";
+        case NOSTR_NIP46_METHOD_GET_PUBLIC_KEY: return "get_public_key";
+        case NOSTR_NIP46_METHOD_NIP04_ENCRYPT: return "nip04_encrypt";
+        case NOSTR_NIP46_METHOD_NIP04_DECRYPT: return "nip04_decrypt";
+        case NOSTR_NIP46_METHOD_NIP44_ENCRYPT: return "nip44_encrypt";
+        case NOSTR_NIP46_METHOD_NIP44_DECRYPT: return "nip44_decrypt";
+        default: return "unknown";
+    }
+}
+
+nostr_nip46_method_t nostr_nip46_string_to_method(const char* method) {
+    if (!method) return NOSTR_NIP46_METHOD_UNKNOWN;
+    if (strcmp(method, "connect") == 0) return NOSTR_NIP46_METHOD_CONNECT;
+    if (strcmp(method, "sign_event") == 0) return NOSTR_NIP46_METHOD_SIGN_EVENT;
+    if (strcmp(method, "ping") == 0) return NOSTR_NIP46_METHOD_PING;
+    if (strcmp(method, "get_public_key") == 0) return NOSTR_NIP46_METHOD_GET_PUBLIC_KEY;
+    if (strcmp(method, "nip04_encrypt") == 0) return NOSTR_NIP46_METHOD_NIP04_ENCRYPT;
+    if (strcmp(method, "nip04_decrypt") == 0) return NOSTR_NIP46_METHOD_NIP04_DECRYPT;
+    if (strcmp(method, "nip44_encrypt") == 0) return NOSTR_NIP46_METHOD_NIP44_ENCRYPT;
+    if (strcmp(method, "nip44_decrypt") == 0) return NOSTR_NIP46_METHOD_NIP44_DECRYPT;
+    return NOSTR_NIP46_METHOD_UNKNOWN;
+}
+
+int nostr_nip46_generate_request_id(char* output, size_t output_size) {
+    if (!output || output_size < NOSTR_NIP46_MAX_REQUEST_ID_LEN) {
+        return NOSTR_ERROR_INVALID_INPUT;
+    }
+
+    unsigned char rnd[16];
+    if (nostr_secp256k1_get_random_bytes(rnd, sizeof(rnd)) != 1) {
+        return NOSTR_ERROR_CRYPTO_FAILED;
+    }
+
+    nostr_bytes_to_hex(rnd, sizeof(rnd), output);
+    return NOSTR_SUCCESS;
+}
+
+int nostr_nip46_create_request(const char* id,
+                               nostr_nip46_method_t method,
+                               const char** params,
+                               int param_count,
+                               nostr_nip46_request_t* out) {
+    if (!id || !out || param_count < 0) return NOSTR_ERROR_INVALID_INPUT;
+    if (strlen(id) >= sizeof(out->id)) return NOSTR_ERROR_NIP46_INVALID_REQUEST;
+
+    memset(out, 0, sizeof(*out));
+    safe_copy(out->id, sizeof(out->id), id);
+    out->method = method;
+    safe_copy(out->method_str, sizeof(out->method_str), nostr_nip46_method_to_string(method));
+
+    out->param_count = param_count;
+    if (param_count == 0) {
+        out->params = NULL;
+        return NOSTR_SUCCESS;
+    }
+
+    out->params = (char**)calloc((size_t)param_count, sizeof(char*));
+    if (!out->params) return NOSTR_ERROR_MEMORY_FAILED;
+
+    for (int i = 0; i < param_count; i++) {
+        const char* p = (params && params[i]) ? params[i] : "";
+        out->params[i] = nip46_strdup(p);
+        if (!out->params[i]) {
+            for (int j = 0; j < i; j++) free(out->params[j]);
+            free(out->params);
+            out->params = NULL;
+            out->param_count = 0;
+            return NOSTR_ERROR_MEMORY_FAILED;
+        }
+    }
+
+    return NOSTR_SUCCESS;
+}
+
+int nostr_nip46_create_response(const char* id,
+                                const char* result,
+                                const char* error,
+                                nostr_nip46_response_t* out) {
+    if (!id || !out) return NOSTR_ERROR_INVALID_INPUT;
+    if (strlen(id) >= sizeof(out->id)) return NOSTR_ERROR_NIP46_INVALID_RESPONSE;
+
+    memset(out, 0, sizeof(*out));
+    safe_copy(out->id, sizeof(out->id), id);
+
+    if (result) {
+        out->result = nip46_strdup(result);
+        if (!out->result) return NOSTR_ERROR_MEMORY_FAILED;
+    }
+
+    if (error) {
+        out->error = nip46_strdup(error);
+        if (!out->error) {
+            free(out->result);
+            out->result = NULL;
+            return NOSTR_ERROR_MEMORY_FAILED;
+        }
+    }
+
+    return NOSTR_SUCCESS;
+}
+
+void nostr_nip46_free_request(nostr_nip46_request_t* request) {
+    if (!request) return;
+    if (request->params) {
+        for (int i = 0; i < request->param_count; i++) {
+            free(request->params[i]);
+        }
+        free(request->params);
+    }
+    memset(request, 0, sizeof(*request));
+}
+
+void nostr_nip46_free_response(nostr_nip46_response_t* response) {
+    if (!response) return;
+    free(response->result);
+    free(response->error);
+    memset(response, 0, sizeof(*response));
+}
+
+int nostr_nip46_request_to_json(const nostr_nip46_request_t* request, char** output_json) {
+    if (!request || !output_json) return NOSTR_ERROR_INVALID_INPUT;
+
+    cJSON* root = cJSON_CreateObject();
+    if (!root) return NOSTR_ERROR_MEMORY_FAILED;
+
+    cJSON_AddStringToObject(root, "id", request->id);
+    cJSON_AddStringToObject(root, "method", request->method_str);
+
+    cJSON* params = cJSON_CreateArray();
+    if (!params) {
+        cJSON_Delete(root);
+        return NOSTR_ERROR_MEMORY_FAILED;
+    }
+
+    for (int i = 0; i < request->param_count; i++) {
+        cJSON_AddItemToArray(params, cJSON_CreateString(request->params[i] ? request->params[i] : ""));
+    }
+    cJSON_AddItemToObject(root, "params", params);
+
+    char* js = cJSON_PrintUnformatted(root);
+    cJSON_Delete(root);
+    if (!js) return NOSTR_ERROR_MEMORY_FAILED;
+
+    *output_json = js;
+    return NOSTR_SUCCESS;
+}
+
+int nostr_nip46_response_to_json(const nostr_nip46_response_t* response, char** output_json) {
+    if (!response || !output_json) return NOSTR_ERROR_INVALID_INPUT;
+
+    cJSON* root = cJSON_CreateObject();
+    if (!root) return NOSTR_ERROR_MEMORY_FAILED;
+
+    cJSON_AddStringToObject(root, "id", response->id);
+    cJSON_AddStringToObject(root, "result", response->result ? response->result : "");
+    if (response->error) {
+        cJSON_AddStringToObject(root, "error", response->error);
+    }
+
+    char* js = cJSON_PrintUnformatted(root);
+    cJSON_Delete(root);
+    if (!js) return NOSTR_ERROR_MEMORY_FAILED;
+
+    *output_json = js;
+    return NOSTR_SUCCESS;
+}
+
+int nostr_nip46_parse_request(const char* json_payload, nostr_nip46_request_t* out) {
+    if (!json_payload || !out) return NOSTR_ERROR_INVALID_INPUT;
+    memset(out, 0, sizeof(*out));
+
+    cJSON* root = cJSON_Parse(json_payload);
+    if (!root) return NOSTR_ERROR_NIP46_INVALID_REQUEST;
+
+    cJSON* id = cJSON_GetObjectItem(root, "id");
+    cJSON* method = cJSON_GetObjectItem(root, "method");
+    cJSON* params = cJSON_GetObjectItem(root, "params");
+
+    if (!cJSON_IsString(id) || !cJSON_IsString(method) || !cJSON_IsArray(params)) {
+        cJSON_Delete(root);
+        return NOSTR_ERROR_NIP46_INVALID_REQUEST;
+    }
+
+    safe_copy(out->id, sizeof(out->id), cJSON_GetStringValue(id));
+    safe_copy(out->method_str, sizeof(out->method_str), cJSON_GetStringValue(method));
+    out->method = nostr_nip46_string_to_method(out->method_str);
+
+    out->param_count = cJSON_GetArraySize(params);
+    if (out->param_count > 0) {
+        out->params = (char**)calloc((size_t)out->param_count, sizeof(char*));
+        if (!out->params) {
+            cJSON_Delete(root);
+            return NOSTR_ERROR_MEMORY_FAILED;
+        }
+
+        for (int i = 0; i < out->param_count; i++) {
+            cJSON* p = cJSON_GetArrayItem(params, i);
+            if (!cJSON_IsString(p)) {
+                nostr_nip46_free_request(out);
+                cJSON_Delete(root);
+                return NOSTR_ERROR_NIP46_INVALID_REQUEST;
+            }
+            out->params[i] = nip46_strdup(cJSON_GetStringValue(p));
+            if (!out->params[i]) {
+                nostr_nip46_free_request(out);
+                cJSON_Delete(root);
+                return NOSTR_ERROR_MEMORY_FAILED;
+            }
+        }
+    }
+
+    cJSON_Delete(root);
+    return NOSTR_SUCCESS;
+}
+
+int nostr_nip46_parse_response(const char* json_payload, nostr_nip46_response_t* out) {
+    if (!json_payload || !out) return NOSTR_ERROR_INVALID_INPUT;
+    memset(out, 0, sizeof(*out));
+
+    cJSON* root = cJSON_Parse(json_payload);
+    if (!root) return NOSTR_ERROR_NIP46_INVALID_RESPONSE;
+
+    cJSON* id = cJSON_GetObjectItem(root, "id");
+    cJSON* result = cJSON_GetObjectItem(root, "result");
+    cJSON* error = cJSON_GetObjectItem(root, "error");
+
+    if (!cJSON_IsString(id) || !cJSON_IsString(result)) {
+        cJSON_Delete(root);
+        return NOSTR_ERROR_NIP46_INVALID_RESPONSE;
+    }
+
+    safe_copy(out->id, sizeof(out->id), cJSON_GetStringValue(id));
+    out->result = nip46_strdup(cJSON_GetStringValue(result));
+    if (!out->result) {
+        cJSON_Delete(root);
+        return NOSTR_ERROR_MEMORY_FAILED;
+    }
+
+    if (error && cJSON_IsString(error)) {
+        out->error = nip46_strdup(cJSON_GetStringValue(error));
+        if (!out->error) {
+            nostr_nip46_free_response(out);
+            cJSON_Delete(root);
+            return NOSTR_ERROR_MEMORY_FAILED;
+        }
+    }
+
+    cJSON_Delete(root);
+    return NOSTR_SUCCESS;
+}
+
+static cJSON* create_nip46_event(int kind,
+                                 const char* encrypted_content,
+                                 const unsigned char* sender_private_key,
+                                 const unsigned char* recipient_public_key,
+                                 time_t timestamp) {
+    if (!encrypted_content || !sender_private_key || !recipient_public_key) return NULL;
+
+    char recipient_hex[65];
+    nostr_bytes_to_hex(recipient_public_key, 32, recipient_hex);
+
+    cJSON* tags = cJSON_CreateArray();
+    if (!tags) return NULL;
+
+    cJSON* ptag = cJSON_CreateArray();
+    if (!ptag) {
+        cJSON_Delete(tags);
+        return NULL;
+    }
+
+    cJSON_AddItemToArray(ptag, cJSON_CreateString("p"));
+    cJSON_AddItemToArray(ptag, cJSON_CreateString(recipient_hex));
+    cJSON_AddItemToArray(tags, ptag);
+
+    cJSON* evt = nostr_create_and_sign_event(kind, encrypted_content, tags, sender_private_key, timestamp);
+    cJSON_Delete(tags);
+    return evt;
+}
+
+cJSON* nostr_nip46_create_request_event(const nostr_nip46_request_t* request,
+                                        const unsigned char* sender_private_key,
+                                        const unsigned char* recipient_public_key,
+                                        time_t timestamp) {
+    if (!request || !sender_private_key || !recipient_public_key) return NULL;
+
+    char* json_payload = NULL;
+    if (nostr_nip46_request_to_json(request, &json_payload) != NOSTR_SUCCESS) return NULL;
+
+    char encrypted[NOSTR_NIP46_MAX_PAYLOAD_LEN];
+    int rc = nostr_nip44_encrypt(sender_private_key, recipient_public_key, json_payload,
+                                 encrypted, sizeof(encrypted));
+    free(json_payload);
+    if (rc != NOSTR_SUCCESS) return NULL;
+
+    return create_nip46_event(NOSTR_NIP46_EVENT_KIND, encrypted,
+                              sender_private_key, recipient_public_key, timestamp);
+}
+
+cJSON* nostr_nip46_create_response_event(const nostr_nip46_response_t* response,
+                                         const unsigned char* sender_private_key,
+                                         const unsigned char* recipient_public_key,
+                                         time_t timestamp) {
+    if (!response || !sender_private_key || !recipient_public_key) return NULL;
+
+    char* json_payload = NULL;
+    if (nostr_nip46_response_to_json(response, &json_payload) != NOSTR_SUCCESS) return NULL;
+
+    char encrypted[NOSTR_NIP46_MAX_PAYLOAD_LEN];
+    int rc = nostr_nip44_encrypt(sender_private_key, recipient_public_key, json_payload,
+                                 encrypted, sizeof(encrypted));
+    free(json_payload);
+    if (rc != NOSTR_SUCCESS) return NULL;
+
+    return create_nip46_event(NOSTR_NIP46_EVENT_KIND, encrypted,
+                              sender_private_key, recipient_public_key, timestamp);
+}
+
+int nostr_nip46_decrypt_event(cJSON* event,
+                              const unsigned char* recipient_private_key,
+                              char* output,
+                              size_t output_size) {
+    if (!event || !recipient_private_key || !output || output_size == 0) {
+        return NOSTR_ERROR_INVALID_INPUT;
+    }
+
+    cJSON* content = cJSON_GetObjectItem(event, "content");
+    cJSON* pubkey = cJSON_GetObjectItem(event, "pubkey");
+    cJSON* kind = cJSON_GetObjectItem(event, "kind");
+
+    if (!cJSON_IsString(content) || !cJSON_IsString(pubkey) || !cJSON_IsNumber(kind)) {
+        return NOSTR_ERROR_NIP46_INVALID_REQUEST;
+    }
+
+    if ((int)cJSON_GetNumberValue(kind) != NOSTR_NIP46_EVENT_KIND) {
+        return NOSTR_ERROR_NIP46_INVALID_REQUEST;
+    }
+
+    const char* sender_hex = cJSON_GetStringValue(pubkey);
+    unsigned char sender_pubkey[32];
+    if (nostr_hex_to_bytes(sender_hex, sender_pubkey, 32) != 0) {
+        return NOSTR_ERROR_NIP46_DECRYPTION_FAILED;
+    }
+
+    int rc = nostr_nip44_decrypt(recipient_private_key, sender_pubkey,
+                                 cJSON_GetStringValue(content), output, output_size);
+    if (rc != NOSTR_SUCCESS) return NOSTR_ERROR_NIP46_DECRYPTION_FAILED;
+    return NOSTR_SUCCESS;
+}
+
+static int parse_query_pairs(const char* query,
+                             int (*cb)(const char* key, const char* val, void* ctx),
+                             void* ctx) {
+    if (!query || !cb) return NOSTR_ERROR_INVALID_INPUT;
+
+    char* work = nip46_strdup(query);
+    if (!work) return NOSTR_ERROR_MEMORY_FAILED;
+
+    char* saveptr = NULL;
+    char* token = strtok_r(work, "&", &saveptr);
+    while (token) {
+        char* eq = strchr(token, '=');
+        if (eq) {
+            *eq = '\0';
+            const char* key = token;
+            const char* val = eq + 1;
+            int rc = cb(key, val, ctx);
+            if (rc != NOSTR_SUCCESS) {
+                free(work);
+                return rc;
+            }
+        }
+        token = strtok_r(NULL, "&", &saveptr);
+    }
+
+    free(work);
+    return NOSTR_SUCCESS;
+}
+
+typedef struct {
+    nostr_nip46_bunker_url_t* out;
+} bunker_parse_ctx_t;
+
+static int bunker_pair_cb(const char* key, const char* val, void* ctx) {
+    bunker_parse_ctx_t* pctx = (bunker_parse_ctx_t*)ctx;
+    char decoded[512];
+    int rc = url_decode(val, decoded, sizeof(decoded));
+    if (rc != NOSTR_SUCCESS) return rc;
+
+    if (strcmp(key, "relay") == 0) {
+        if (pctx->out->relay_count >= NOSTR_NIP46_MAX_RELAYS) return NOSTR_SUCCESS;
+        safe_copy(pctx->out->relays[pctx->out->relay_count],
+                  sizeof(pctx->out->relays[pctx->out->relay_count]), decoded);
+        pctx->out->relay_count++;
+    } else if (strcmp(key, "secret") == 0) {
+        safe_copy(pctx->out->secret, sizeof(pctx->out->secret), decoded);
+    }
+
+    return NOSTR_SUCCESS;
+}
+
+int nostr_nip46_parse_bunker_url(const char* url, nostr_nip46_bunker_url_t* out) {
+    if (!url || !out) return NOSTR_ERROR_INVALID_INPUT;
+    memset(out, 0, sizeof(*out));
+
+    const char* prefix = "bunker://";
+    size_t prefix_len = strlen(prefix);
+    if (strncmp(url, prefix, prefix_len) != 0) {
+        return NOSTR_ERROR_NIP46_INVALID_BUNKER_URL;
+    }
+
+    const char* after = url + prefix_len;
+    const char* q = strchr(after, '?');
+
+    char pubkey[65];
+    if (!q) {
+        safe_copy(pubkey, sizeof(pubkey), after);
+    } else {
+        size_t l = (size_t)(q - after);
+        if (l >= sizeof(pubkey)) return NOSTR_ERROR_NIP46_INVALID_BUNKER_URL;
+        memcpy(pubkey, after, l);
+        pubkey[l] = '\0';
+    }
+
+    if (!is_hex_64(pubkey)) return NOSTR_ERROR_NIP46_INVALID_BUNKER_URL;
+    safe_copy(out->remote_signer_pubkey, sizeof(out->remote_signer_pubkey), pubkey);
+
+    if (q && *(q + 1)) {
+        bunker_parse_ctx_t ctx = { out };
+        int rc = parse_query_pairs(q + 1, bunker_pair_cb, &ctx);
+        if (rc != NOSTR_SUCCESS) return rc;
+    }
+
+    return NOSTR_SUCCESS;
+}
+
+typedef struct {
+    nostr_nip46_nostrconnect_url_t* out;
+} nostrconnect_parse_ctx_t;
+
+static int nostrconnect_pair_cb(const char* key, const char* val, void* ctx) {
+    nostrconnect_parse_ctx_t* pctx = (nostrconnect_parse_ctx_t*)ctx;
+    char decoded[1024];
+    int rc = url_decode(val, decoded, sizeof(decoded));
+    if (rc != NOSTR_SUCCESS) return rc;
+
+    if (strcmp(key, "relay") == 0) {
+        if (pctx->out->relay_count >= NOSTR_NIP46_MAX_RELAYS) return NOSTR_SUCCESS;
+        safe_copy(pctx->out->relays[pctx->out->relay_count],
+                  sizeof(pctx->out->relays[pctx->out->relay_count]), decoded);
+        pctx->out->relay_count++;
+    } else if (strcmp(key, "secret") == 0) {
+        safe_copy(pctx->out->secret, sizeof(pctx->out->secret), decoded);
+    } else if (strcmp(key, "perms") == 0) {
+        safe_copy(pctx->out->perms, sizeof(pctx->out->perms), decoded);
+    } else if (strcmp(key, "name") == 0) {
+        safe_copy(pctx->out->name, sizeof(pctx->out->name), decoded);
+    } else if (strcmp(key, "url") == 0) {
+        safe_copy(pctx->out->url, sizeof(pctx->out->url), decoded);
+    } else if (strcmp(key, "image") == 0) {
+        safe_copy(pctx->out->image, sizeof(pctx->out->image), decoded);
+    }
+
+    return NOSTR_SUCCESS;
+}
+
+int nostr_nip46_parse_nostrconnect_url(const char* url, nostr_nip46_nostrconnect_url_t* out) {
+    if (!url || !out) return NOSTR_ERROR_INVALID_INPUT;
+    memset(out, 0, sizeof(*out));
+
+    const char* prefix = "nostrconnect://";
+    size_t prefix_len = strlen(prefix);
+    if (strncmp(url, prefix, prefix_len) != 0) {
+        return NOSTR_ERROR_NIP46_INVALID_NOSTRCONNECT;
+    }
+
+    const char* after = url + prefix_len;
+    const char* q = strchr(after, '?');
+
+    char pubkey[65];
+    if (!q) {
+        safe_copy(pubkey, sizeof(pubkey), after);
+    } else {
+        size_t l = (size_t)(q - after);
+        if (l >= sizeof(pubkey)) return NOSTR_ERROR_NIP46_INVALID_NOSTRCONNECT;
+        memcpy(pubkey, after, l);
+        pubkey[l] = '\0';
+    }
+
+    if (!is_hex_64(pubkey)) return NOSTR_ERROR_NIP46_INVALID_NOSTRCONNECT;
+    safe_copy(out->client_pubkey, sizeof(out->client_pubkey), pubkey);
+
+    if (q && *(q + 1)) {
+        nostrconnect_parse_ctx_t ctx = { out };
+        int rc = parse_query_pairs(q + 1, nostrconnect_pair_cb, &ctx);
+        if (rc != NOSTR_SUCCESS) return rc;
+    }
+
+    if (out->relay_count <= 0 || out->secret[0] == '\0') {
+        return NOSTR_ERROR_NIP46_INVALID_NOSTRCONNECT;
+    }
+
+    return NOSTR_SUCCESS;
+}
+
+int nostr_nip46_create_bunker_url(const nostr_nip46_bunker_url_t* in, char* output, size_t output_size) {
+    if (!in || !output || output_size == 0) return NOSTR_ERROR_INVALID_INPUT;
+    if (!is_hex_64(in->remote_signer_pubkey)) return NOSTR_ERROR_NIP46_INVALID_BUNKER_URL;
+
+    size_t used = (size_t)snprintf(output, output_size, "bunker://%s", in->remote_signer_pubkey);
+    if (used >= output_size) return NOSTR_ERROR_NIP46_INVALID_BUNKER_URL;
+
+    int first = 1;
+    for (int i = 0; i < in->relay_count; i++) {
+        char enc[768];
+        int rc = url_encode(in->relays[i], enc, sizeof(enc));
+        if (rc != NOSTR_SUCCESS) return rc;
+
+        int wrote = snprintf(output + used, output_size - used, "%crelay=%s", first ? '?' : '&', enc);
+        if (wrote < 0 || (size_t)wrote >= output_size - used) return NOSTR_ERROR_NIP46_INVALID_BUNKER_URL;
+        used += (size_t)wrote;
+        first = 0;
+    }
+
+    if (in->secret[0]) {
+        char encs[512];
+        int rc = url_encode(in->secret, encs, sizeof(encs));
+        if (rc != NOSTR_SUCCESS) return rc;
+
+        int wrote = snprintf(output + used, output_size - used, "%csecret=%s", first ? '?' : '&', encs);
+        if (wrote < 0 || (size_t)wrote >= output_size - used) return NOSTR_ERROR_NIP46_INVALID_BUNKER_URL;
+    }
+
+    return NOSTR_SUCCESS;
+}
+
+int nostr_nip46_create_nostrconnect_url(const nostr_nip46_nostrconnect_url_t* in,
+                                        char* output,
+                                        size_t output_size) {
+    if (!in || !output || output_size == 0) return NOSTR_ERROR_INVALID_INPUT;
+    if (!is_hex_64(in->client_pubkey)) return NOSTR_ERROR_NIP46_INVALID_NOSTRCONNECT;
+    if (in->relay_count <= 0 || in->secret[0] == '\0') return NOSTR_ERROR_NIP46_INVALID_NOSTRCONNECT;
+
+    size_t used = (size_t)snprintf(output, output_size, "nostrconnect://%s", in->client_pubkey);
+    if (used >= output_size) return NOSTR_ERROR_NIP46_INVALID_NOSTRCONNECT;
+
+    int first = 1;
+    for (int i = 0; i < in->relay_count; i++) {
+        char enc[768];
+        int rc = url_encode(in->relays[i], enc, sizeof(enc));
+        if (rc != NOSTR_SUCCESS) return rc;
+
+        int wrote = snprintf(output + used, output_size - used, "%crelay=%s", first ? '?' : '&', enc);
+        if (wrote < 0 || (size_t)wrote >= output_size - used) return NOSTR_ERROR_NIP46_INVALID_NOSTRCONNECT;
+        used += (size_t)wrote;
+        first = 0;
+    }
+
+    char enc_secret[512];
+    int rc = url_encode(in->secret, enc_secret, sizeof(enc_secret));
+    if (rc != NOSTR_SUCCESS) return rc;
+
+    int wrote = snprintf(output + used, output_size - used, "%csecret=%s", first ? '?' : '&', enc_secret);
+    if (wrote < 0 || (size_t)wrote >= output_size - used) return NOSTR_ERROR_NIP46_INVALID_NOSTRCONNECT;
+    used += (size_t)wrote;
+
+    if (in->perms[0]) {
+        char enc[1024];
+        rc = url_encode(in->perms, enc, sizeof(enc));
+        if (rc != NOSTR_SUCCESS) return rc;
+        wrote = snprintf(output + used, output_size - used, "&perms=%s", enc);
+        if (wrote < 0 || (size_t)wrote >= output_size - used) return NOSTR_ERROR_NIP46_INVALID_NOSTRCONNECT;
+        used += (size_t)wrote;
+    }
+
+    if (in->name[0]) {
+        char enc[512];
+        rc = url_encode(in->name, enc, sizeof(enc));
+        if (rc != NOSTR_SUCCESS) return rc;
+        wrote = snprintf(output + used, output_size - used, "&name=%s", enc);
+        if (wrote < 0 || (size_t)wrote >= output_size - used) return NOSTR_ERROR_NIP46_INVALID_NOSTRCONNECT;
+        used += (size_t)wrote;
+    }
+
+    if (in->url[0]) {
+        char enc[768];
+        rc = url_encode(in->url, enc, sizeof(enc));
+        if (rc != NOSTR_SUCCESS) return rc;
+        wrote = snprintf(output + used, output_size - used, "&url=%s", enc);
+        if (wrote < 0 || (size_t)wrote >= output_size - used) return NOSTR_ERROR_NIP46_INVALID_NOSTRCONNECT;
+        used += (size_t)wrote;
+    }
+
+    if (in->image[0]) {
+        char enc[768];
+        rc = url_encode(in->image, enc, sizeof(enc));
+        if (rc != NOSTR_SUCCESS) return rc;
+        wrote = snprintf(output + used, output_size - used, "&image=%s", enc);
+        if (wrote < 0 || (size_t)wrote >= output_size - used) return NOSTR_ERROR_NIP46_INVALID_NOSTRCONNECT;
+    }
+
+    return NOSTR_SUCCESS;
+}
+
+int nostr_nip46_client_session_init(nostr_nip46_client_session_t* session,
+                                    const unsigned char* client_private_key,
+                                    const char* bunker_url) {
+    if (!session || !client_private_key || !bunker_url) return NOSTR_ERROR_INVALID_INPUT;
+
+    memset(session, 0, sizeof(*session));
+    memcpy(session->client_private_key, client_private_key, 32);
+
+    unsigned char client_pub[32];
+    if (nostr_ec_public_key_from_private_key(client_private_key, client_pub) != 0) {
+        return NOSTR_ERROR_CRYPTO_FAILED;
+    }
+    nostr_bytes_to_hex(client_pub, 32, session->client_pubkey_hex);
+
+    nostr_nip46_bunker_url_t parsed;
+    int rc = nostr_nip46_parse_bunker_url(bunker_url, &parsed);
+    if (rc != NOSTR_SUCCESS) return rc;
+
+    safe_copy(session->remote_signer_pubkey_hex, sizeof(session->remote_signer_pubkey_hex), parsed.remote_signer_pubkey);
+    if (nostr_hex_to_bytes(parsed.remote_signer_pubkey, session->remote_signer_pubkey, 32) != 0) {
+        return NOSTR_ERROR_NIP46_INVALID_BUNKER_URL;
+    }
+
+    session->relay_count = parsed.relay_count;
+    for (int i = 0; i < parsed.relay_count; i++) {
+        safe_copy(session->relays[i], sizeof(session->relays[i]), parsed.relays[i]);
+    }
+
+    session->connected = 0;
+    return NOSTR_SUCCESS;
+}
+
+void nostr_nip46_client_session_destroy(nostr_nip46_client_session_t* session) {
+    if (!session) return;
+    memset(session, 0, sizeof(*session));
+}
+
+static int client_make_request_event(nostr_nip46_client_session_t* session,
+                                     nostr_nip46_method_t method,
+                                     const char** params,
+                                     int param_count,
+                                     cJSON** request_event_out) {
+    if (!session || !request_event_out) return NOSTR_ERROR_INVALID_INPUT;
+
+    char req_id[NOSTR_NIP46_MAX_REQUEST_ID_LEN];
+    int rc = nostr_nip46_generate_request_id(req_id, sizeof(req_id));
+    if (rc != NOSTR_SUCCESS) return rc;
+
+    nostr_nip46_request_t req;
+    rc = nostr_nip46_create_request(req_id, method, params, param_count, &req);
+    if (rc != NOSTR_SUCCESS) return rc;
+
+    cJSON* evt = nostr_nip46_create_request_event(&req, session->client_private_key,
+                                                  session->remote_signer_pubkey, 0);
+    nostr_nip46_free_request(&req);
+    if (!evt) return NOSTR_ERROR_NIP46_ENCRYPTION_FAILED;
+
+    *request_event_out = evt;
+    return NOSTR_SUCCESS;
+}
+
+int nostr_nip46_client_connect(nostr_nip46_client_session_t* session,
+                               const char* optional_secret,
+                               const char* optional_permissions,
+                               cJSON** request_event_out) {
+    if (!session || !request_event_out) return NOSTR_ERROR_INVALID_INPUT;
+
+    const char* params[3];
+    int count = 1;
+    params[0] = session->remote_signer_pubkey_hex;
+
+    if (optional_secret && optional_secret[0]) {
+        params[count++] = optional_secret;
+    }
+    if (optional_permissions && optional_permissions[0]) {
+        params[count++] = optional_permissions;
+    }
+
+    return client_make_request_event(session, NOSTR_NIP46_METHOD_CONNECT, params, count, request_event_out);
+}
+
+int nostr_nip46_client_get_public_key(nostr_nip46_client_session_t* session,
+                                      cJSON** request_event_out) {
+    return client_make_request_event(session, NOSTR_NIP46_METHOD_GET_PUBLIC_KEY, NULL, 0, request_event_out);
+}
+
+int nostr_nip46_client_ping(nostr_nip46_client_session_t* session,
+                            cJSON** request_event_out) {
+    return client_make_request_event(session, NOSTR_NIP46_METHOD_PING, NULL, 0, request_event_out);
+}
+
+int nostr_nip46_client_sign_event(nostr_nip46_client_session_t* session,
+                                  cJSON* unsigned_event,
+                                  cJSON** request_event_out) {
+    if (!session || !unsigned_event || !request_event_out) return NOSTR_ERROR_INVALID_INPUT;
+
+    char* ev = cJSON_PrintUnformatted(unsigned_event);
+    if (!ev) return NOSTR_ERROR_MEMORY_FAILED;
+
+    const char* params[1] = { ev };
+    int rc = client_make_request_event(session, NOSTR_NIP46_METHOD_SIGN_EVENT, params, 1, request_event_out);
+    free(ev);
+    return rc;
+}
+
+int nostr_nip46_signer_session_init(nostr_nip46_signer_session_t* session,
+                                    const unsigned char* signer_private_key,
+                                    const unsigned char* user_private_key,
+                                    const char** relays,
+                                    int relay_count) {
+    if (!session || !signer_private_key || !user_private_key) return NOSTR_ERROR_INVALID_INPUT;
+
+    memset(session, 0, sizeof(*session));
+    memcpy(session->signer_private_key, signer_private_key, 32);
+    memcpy(session->user_private_key, user_private_key, 32);
+
+    unsigned char signer_pub[32];
+    unsigned char user_pub[32];
+
+    if (nostr_ec_public_key_from_private_key(signer_private_key, signer_pub) != 0) return NOSTR_ERROR_CRYPTO_FAILED;
+    if (nostr_ec_public_key_from_private_key(user_private_key, user_pub) != 0) return NOSTR_ERROR_CRYPTO_FAILED;
+
+    nostr_bytes_to_hex(signer_pub, 32, session->signer_pubkey_hex);
+    nostr_bytes_to_hex(user_pub, 32, session->user_pubkey_hex);
+
+    if (relay_count > NOSTR_NIP46_MAX_RELAYS) relay_count = NOSTR_NIP46_MAX_RELAYS;
+    session->relay_count = relay_count;
+    for (int i = 0; i < relay_count; i++) {
+        safe_copy(session->relays[i], sizeof(session->relays[i]), relays[i]);
+    }
+
+    session->connected = 0;
+    return NOSTR_SUCCESS;
+}
+
+void nostr_nip46_signer_session_destroy(nostr_nip46_signer_session_t* session) {
+    if (!session) return;
+    memset(session, 0, sizeof(*session));
+}
+
+int nostr_nip46_signer_create_bunker_url(const nostr_nip46_signer_session_t* session,
+                                         const char* optional_secret,
+                                         char* output,
+                                         size_t output_size) {
+    if (!session || !output) return NOSTR_ERROR_INVALID_INPUT;
+
+    nostr_nip46_bunker_url_t b;
+    memset(&b, 0, sizeof(b));
+    safe_copy(b.remote_signer_pubkey, sizeof(b.remote_signer_pubkey), session->signer_pubkey_hex);
+    b.relay_count = session->relay_count;
+    for (int i = 0; i < session->relay_count; i++) {
+        safe_copy(b.relays[i], sizeof(b.relays[i]), session->relays[i]);
+    }
+    if (optional_secret) {
+        safe_copy(b.secret, sizeof(b.secret), optional_secret);
+    }
+
+    return nostr_nip46_create_bunker_url(&b, output, output_size);
+}
+
+static int signer_make_ok(const char* id, const char* result, nostr_nip46_response_t* out) {
+    return nostr_nip46_create_response(id, result, NULL, out);
+}
+
+static int signer_make_err(const char* id, const char* err, nostr_nip46_response_t* out) {
+    return nostr_nip46_create_response(id, "", err, out);
+}
+
+int nostr_nip46_signer_handle_request(nostr_nip46_signer_session_t* session,
+                                      const nostr_nip46_request_t* request,
+                                      nostr_nip46_response_t* response_out) {
+    if (!session || !request || !response_out) return NOSTR_ERROR_INVALID_INPUT;
+
+    switch (request->method) {
+        case NOSTR_NIP46_METHOD_CONNECT: {
+            if (request->param_count >= 1 && request->params[0] && request->params[0][0]) {
+                if (strcmp(request->params[0], session->signer_pubkey_hex) != 0) {
+                    return signer_make_err(request->id, "remote signer pubkey mismatch", response_out);
+                }
+            }
+            session->connected = 1;
+            if (request->param_count >= 2 && request->params[1] && request->params[1][0]) {
+                return signer_make_ok(request->id, request->params[1], response_out);
+            }
+            return signer_make_ok(request->id, "ack", response_out);
+        }
+
+        case NOSTR_NIP46_METHOD_PING:
+            return signer_make_ok(request->id, "pong", response_out);
+
+        case NOSTR_NIP46_METHOD_GET_PUBLIC_KEY:
+            return signer_make_ok(request->id, session->user_pubkey_hex, response_out);
+
+        case NOSTR_NIP46_METHOD_SIGN_EVENT: {
+            if (request->param_count < 1 || !request->params[0]) {
+                return signer_make_err(request->id, "missing sign_event payload", response_out);
+            }
+
+            cJSON* in = cJSON_Parse(request->params[0]);
+            if (!in) return signer_make_err(request->id, "invalid sign_event JSON", response_out);
+
+            cJSON* kind = cJSON_GetObjectItem(in, "kind");
+            cJSON* content = cJSON_GetObjectItem(in, "content");
+            cJSON* tags = cJSON_GetObjectItem(in, "tags");
+            cJSON* created = cJSON_GetObjectItem(in, "created_at");
+
+            if (!cJSON_IsNumber(kind) || !cJSON_IsString(content)) {
+                cJSON_Delete(in);
+                return signer_make_err(request->id, "invalid sign_event fields", response_out);
+            }
+
+            time_t ts = 0;
+            if (created && cJSON_IsNumber(created)) {
+                ts = (time_t)cJSON_GetNumberValue(created);
+            }
+
+            cJSON* signed_evt = nostr_create_and_sign_event((int)cJSON_GetNumberValue(kind),
+                                                            cJSON_GetStringValue(content),
+                                                            cJSON_IsArray(tags) ? tags : NULL,
+                                                            session->user_private_key,
+                                                            ts);
+            cJSON_Delete(in);
+            if (!signed_evt) {
+                return signer_make_err(request->id, "failed to sign event", response_out);
+            }
+
+            char* signed_json = cJSON_PrintUnformatted(signed_evt);
+            cJSON_Delete(signed_evt);
+            if (!signed_json) {
+                return signer_make_err(request->id, "failed to encode signed event", response_out);
+            }
+
+            int rc = signer_make_ok(request->id, signed_json, response_out);
+            free(signed_json);
+            return rc;
+        }
+
+        case NOSTR_NIP46_METHOD_NIP04_ENCRYPT:
+        case NOSTR_NIP46_METHOD_NIP04_DECRYPT:
+        case NOSTR_NIP46_METHOD_NIP44_ENCRYPT:
+        case NOSTR_NIP46_METHOD_NIP44_DECRYPT: {
+            if (request->param_count < 2 || !request->params[0] || !request->params[1]) {
+                return signer_make_err(request->id, "missing crypto params", response_out);
+            }
+
+            unsigned char peer_pub[32];
+            if (nostr_hex_to_bytes(request->params[0], peer_pub, 32) != 0) {
+                return signer_make_err(request->id, "invalid peer pubkey", response_out);
+            }
+
+            char out_buf[NOSTR_NIP46_MAX_PAYLOAD_LEN];
+            int rc;
+            if (request->method == NOSTR_NIP46_METHOD_NIP04_ENCRYPT) {
+                rc = nostr_nip04_encrypt(session->user_private_key, peer_pub, request->params[1], out_buf, sizeof(out_buf));
+            } else if (request->method == NOSTR_NIP46_METHOD_NIP04_DECRYPT) {
+                rc = nostr_nip04_decrypt(session->user_private_key, peer_pub, request->params[1], out_buf, sizeof(out_buf));
+            } else if (request->method == NOSTR_NIP46_METHOD_NIP44_ENCRYPT) {
+                rc = nostr_nip44_encrypt(session->user_private_key, peer_pub, request->params[1], out_buf, sizeof(out_buf));
+            } else {
+                rc = nostr_nip44_decrypt(session->user_private_key, peer_pub, request->params[1], out_buf, sizeof(out_buf));
+            }
+
+            if (rc != NOSTR_SUCCESS) {
+                return signer_make_err(request->id, nostr_strerror(rc), response_out);
+            }
+
+            return signer_make_ok(request->id, out_buf, response_out);
+        }
+
+        default:
+            return signer_make_err(request->id, "unknown method", response_out);
+    }
+}
@@ -0,0 +1,181 @@
+/*
+ * NIP-46: Nostr Remote Signing
+ * https://github.com/nostr-protocol/nips/blob/master/46.md
+ */
+
+#ifndef NOSTR_NIP046_H
+#define NOSTR_NIP046_H
+
+#include <stddef.h>
+#include <time.h>
+#include "nostr_common.h"
+#include "nip001.h"
+#include "../cjson/cJSON.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#define NOSTR_NIP46_EVENT_KIND 24133
+#define NOSTR_NIP46_MAX_RELAYS 8
+#define NOSTR_NIP46_MAX_RELAY_URL_LEN 256
+#define NOSTR_NIP46_MAX_SECRET_LEN 128
+#define NOSTR_NIP46_MAX_REQUEST_ID_LEN 65
+#define NOSTR_NIP46_MAX_METHOD_LEN 32
+#define NOSTR_NIP46_MAX_URL_LEN 2048
+#define NOSTR_NIP46_MAX_PAYLOAD_LEN 65536
+
+typedef enum {
+    NOSTR_NIP46_CONN_BUNKER = 0,
+    NOSTR_NIP46_CONN_NOSTRCONNECT = 1
+} nostr_nip46_connection_type_t;
+
+typedef enum {
+    NOSTR_NIP46_METHOD_CONNECT = 0,
+    NOSTR_NIP46_METHOD_SIGN_EVENT,
+    NOSTR_NIP46_METHOD_PING,
+    NOSTR_NIP46_METHOD_GET_PUBLIC_KEY,
+    NOSTR_NIP46_METHOD_NIP04_ENCRYPT,
+    NOSTR_NIP46_METHOD_NIP04_DECRYPT,
+    NOSTR_NIP46_METHOD_NIP44_ENCRYPT,
+    NOSTR_NIP46_METHOD_NIP44_DECRYPT,
+    NOSTR_NIP46_METHOD_UNKNOWN
+} nostr_nip46_method_t;
+
+typedef struct {
+    char remote_signer_pubkey[65];
+    char relays[NOSTR_NIP46_MAX_RELAYS][NOSTR_NIP46_MAX_RELAY_URL_LEN];
+    int relay_count;
+    char secret[NOSTR_NIP46_MAX_SECRET_LEN];
+} nostr_nip46_bunker_url_t;
+
+typedef struct {
+    char client_pubkey[65];
+    char relays[NOSTR_NIP46_MAX_RELAYS][NOSTR_NIP46_MAX_RELAY_URL_LEN];
+    int relay_count;
+    char secret[NOSTR_NIP46_MAX_SECRET_LEN];
+    char perms[512];
+    char name[128];
+    char url[256];
+    char image[256];
+} nostr_nip46_nostrconnect_url_t;
+
+typedef struct {
+    char id[NOSTR_NIP46_MAX_REQUEST_ID_LEN];
+    nostr_nip46_method_t method;
+    char method_str[NOSTR_NIP46_MAX_METHOD_LEN];
+    char** params;
+    int param_count;
+} nostr_nip46_request_t;
+
+typedef struct {
+    char id[NOSTR_NIP46_MAX_REQUEST_ID_LEN];
+    char* result;
+    char* error;
+} nostr_nip46_response_t;
+
+typedef struct {
+    unsigned char client_private_key[32];
+    char client_pubkey_hex[65];
+    char remote_signer_pubkey_hex[65];
+    unsigned char remote_signer_pubkey[32];
+    char user_pubkey_hex[65];
+    char relays[NOSTR_NIP46_MAX_RELAYS][NOSTR_NIP46_MAX_RELAY_URL_LEN];
+    int relay_count;
+    int connected;
+} nostr_nip46_client_session_t;
+
+typedef struct {
+    unsigned char signer_private_key[32];
+    char signer_pubkey_hex[65];
+    unsigned char user_private_key[32];
+    char user_pubkey_hex[65];
+    char client_pubkey_hex[65];
+    unsigned char client_pubkey[32];
+    char relays[NOSTR_NIP46_MAX_RELAYS][NOSTR_NIP46_MAX_RELAY_URL_LEN];
+    int relay_count;
+    int connected;
+} nostr_nip46_signer_session_t;
+
+/* URL parsing/creation */
+int nostr_nip46_parse_bunker_url(const char* url, nostr_nip46_bunker_url_t* out);
+int nostr_nip46_parse_nostrconnect_url(const char* url, nostr_nip46_nostrconnect_url_t* out);
+int nostr_nip46_create_bunker_url(const nostr_nip46_bunker_url_t* in, char* output, size_t output_size);
+int nostr_nip46_create_nostrconnect_url(const nostr_nip46_nostrconnect_url_t* in, char* output, size_t output_size);
+
+/* Method conversion */
+const char* nostr_nip46_method_to_string(nostr_nip46_method_t method);
+nostr_nip46_method_t nostr_nip46_string_to_method(const char* method);
+
+/* Request/response object utilities */
+int nostr_nip46_generate_request_id(char* output, size_t output_size);
+int nostr_nip46_create_request(const char* id,
+                               nostr_nip46_method_t method,
+                               const char** params,
+                               int param_count,
+                               nostr_nip46_request_t* out);
+int nostr_nip46_create_response(const char* id,
+                                const char* result,
+                                const char* error,
+                                nostr_nip46_response_t* out);
+int nostr_nip46_parse_request(const char* json_payload, nostr_nip46_request_t* out);
+int nostr_nip46_parse_response(const char* json_payload, nostr_nip46_response_t* out);
+void nostr_nip46_free_request(nostr_nip46_request_t* request);
+void nostr_nip46_free_response(nostr_nip46_response_t* response);
+
+/* JSON payload serialization */
+int nostr_nip46_request_to_json(const nostr_nip46_request_t* request, char** output_json);
+int nostr_nip46_response_to_json(const nostr_nip46_response_t* response, char** output_json);
+
+/* Event creation/decryption */
+cJSON* nostr_nip46_create_request_event(const nostr_nip46_request_t* request,
+                                        const unsigned char* sender_private_key,
+                                        const unsigned char* recipient_public_key,
+                                        time_t timestamp);
+cJSON* nostr_nip46_create_response_event(const nostr_nip46_response_t* response,
+                                         const unsigned char* sender_private_key,
+                                         const unsigned char* recipient_public_key,
+                                         time_t timestamp);
+int nostr_nip46_decrypt_event(cJSON* event,
+                              const unsigned char* recipient_private_key,
+                              char* output,
+                              size_t output_size);
+
+/* Client session */
+int nostr_nip46_client_session_init(nostr_nip46_client_session_t* session,
+                                    const unsigned char* client_private_key,
+                                    const char* bunker_url);
+void nostr_nip46_client_session_destroy(nostr_nip46_client_session_t* session);
+
+int nostr_nip46_client_connect(nostr_nip46_client_session_t* session,
+                               const char* optional_secret,
+                               const char* optional_permissions,
+                               cJSON** request_event_out);
+int nostr_nip46_client_get_public_key(nostr_nip46_client_session_t* session,
+                                      cJSON** request_event_out);
+int nostr_nip46_client_ping(nostr_nip46_client_session_t* session,
+                            cJSON** request_event_out);
+int nostr_nip46_client_sign_event(nostr_nip46_client_session_t* session,
+                                  cJSON* unsigned_event,
+                                  cJSON** request_event_out);
+
+/* Signer session */
+int nostr_nip46_signer_session_init(nostr_nip46_signer_session_t* session,
+                                    const unsigned char* signer_private_key,
+                                    const unsigned char* user_private_key,
+                                    const char** relays,
+                                    int relay_count);
+void nostr_nip46_signer_session_destroy(nostr_nip46_signer_session_t* session);
+int nostr_nip46_signer_handle_request(nostr_nip46_signer_session_t* session,
+                                      const nostr_nip46_request_t* request,
+                                      nostr_nip46_response_t* response_out);
+int nostr_nip46_signer_create_bunker_url(const nostr_nip46_signer_session_t* session,
+                                         const char* optional_secret,
+                                         char* output,
+                                         size_t output_size);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* NOSTR_NIP046_H */
@@ -0,0 +1,412 @@
+/*
+ * NIP-59: Gift Wrap Implementation
+ * https://github.com/nostr-protocol/nips/blob/master/59.md
+ */
+
+#include "nip059.h"
+#include "nip044.h"
+#include "nip001.h"
+#include "utils.h"
+#include "nostr_common.h"
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <time.h>
+
+// Forward declarations for crypto functions
+int nostr_secp256k1_get_random_bytes(unsigned char* buf, size_t len);
+int nostr_ec_public_key_from_private_key(const unsigned char* private_key, unsigned char* public_key);
+int nostr_ec_sign(const unsigned char* private_key, const unsigned char* hash, unsigned char* signature);
+
+// Memory clearing utility
+static void memory_clear(const void *p, size_t len) {
+    if (p && len) {
+        memset((void *)p, 0, len);
+    }
+}
+
+/**
+ * Create a random timestamp within max_delay_sec in the past (configurable)
+ */
+static time_t random_past_timestamp(long max_delay_sec) {
+    time_t now = time(NULL);
+
+    // If max_delay_sec is 0, return current timestamp (no randomization)
+    if (max_delay_sec == 0) {
+        return now;
+    }
+
+    // Random time up to max_delay_sec in the past
+    long random_offset = (long)(rand() % max_delay_sec);
+    return now - random_offset;
+}
+
+/**
+ * Generate a random private key for gift wrap
+ */
+static int generate_random_private_key(unsigned char* private_key) {
+    return nostr_secp256k1_get_random_bytes(private_key, 32);
+}
+
+/**
+ * Create event ID from event data (without signature)
+ */
+static int create_event_id(cJSON* event, char* event_id_hex) {
+    if (!event || !event_id_hex) {
+        return -1;
+    }
+
+    // Get event fields for serialization
+    cJSON* pubkey_item = cJSON_GetObjectItem(event, "pubkey");
+    cJSON* created_at_item = cJSON_GetObjectItem(event, "created_at");
+    cJSON* kind_item = cJSON_GetObjectItem(event, "kind");
+    cJSON* tags_item = cJSON_GetObjectItem(event, "tags");
+    cJSON* content_item = cJSON_GetObjectItem(event, "content");
+
+    if (!pubkey_item || !created_at_item || !kind_item || !tags_item || !content_item) {
+        return -1;
+    }
+
+    // Create serialization array: [0, pubkey, created_at, kind, tags, content]
+    cJSON* serialize_array = cJSON_CreateArray();
+    if (!serialize_array) {
+        return -1;
+    }
+
+    cJSON_AddItemToArray(serialize_array, cJSON_CreateNumber(0));
+    cJSON_AddItemToArray(serialize_array, cJSON_Duplicate(pubkey_item, 1));
+    cJSON_AddItemToArray(serialize_array, cJSON_Duplicate(created_at_item, 1));
+    cJSON_AddItemToArray(serialize_array, cJSON_Duplicate(kind_item, 1));
+    cJSON_AddItemToArray(serialize_array, cJSON_Duplicate(tags_item, 1));
+    cJSON_AddItemToArray(serialize_array, cJSON_Duplicate(content_item, 1));
+
+    char* serialize_string = cJSON_PrintUnformatted(serialize_array);
+    cJSON_Delete(serialize_array);
+
+    if (!serialize_string) {
+        return -1;
+    }
+
+    // Hash the serialized event
+    unsigned char event_hash[32];
+    if (nostr_sha256((const unsigned char*)serialize_string, strlen(serialize_string), event_hash) != 0) {
+        free(serialize_string);
+        return -1;
+    }
+
+    // Convert hash to hex
+    nostr_bytes_to_hex(event_hash, 32, event_id_hex);
+
+    free(serialize_string);
+    return 0;
+}
+
+/**
+ * NIP-59: Create a rumor (unsigned event)
+ */
+cJSON* nostr_nip59_create_rumor(int kind, const char* content, cJSON* tags,
+                               const char* pubkey_hex, time_t created_at) {
+    if (!pubkey_hex || !content) {
+        return NULL;
+    }
+
+    // Use provided timestamp or random past timestamp (default to 0 for compatibility)
+    time_t event_time = (created_at == 0) ? random_past_timestamp(0) : created_at;
+
+    // Create event structure (without id and sig - that's what makes it a rumor)
+    cJSON* rumor = cJSON_CreateObject();
+    if (!rumor) {
+        return NULL;
+    }
+
+    cJSON_AddStringToObject(rumor, "pubkey", pubkey_hex);
+    cJSON_AddNumberToObject(rumor, "created_at", (double)event_time);
+    cJSON_AddNumberToObject(rumor, "kind", kind);
+
+    // Add tags (copy provided tags or create empty array)
+    if (tags) {
+        cJSON_AddItemToObject(rumor, "tags", cJSON_Duplicate(tags, 1));
+    } else {
+        cJSON_AddItemToObject(rumor, "tags", cJSON_CreateArray());
+    }
+
+    cJSON_AddStringToObject(rumor, "content", content);
+
+    // Calculate and add event ID
+    char event_id[65];
+    if (create_event_id(rumor, event_id) != 0) {
+        cJSON_Delete(rumor);
+        return NULL;
+    }
+
+    cJSON_AddStringToObject(rumor, "id", event_id);
+
+    return rumor;
+}
+
+/**
+ * NIP-59: Create a seal (kind 13) wrapping a rumor
+ */
+cJSON* nostr_nip59_create_seal(cJSON* rumor, const unsigned char* sender_private_key,
+                               const unsigned char* recipient_public_key, long max_delay_sec) {
+    if (!rumor || !sender_private_key || !recipient_public_key) {
+        return NULL;
+    }
+
+    // Serialize the rumor to JSON
+    char* rumor_json = cJSON_PrintUnformatted(rumor);
+    if (!rumor_json) {
+        return NULL;
+    }
+
+    // Encrypt the rumor using NIP-44
+    char encrypted_content[4096]; // Should be large enough for most events
+    int encrypt_result = nostr_nip44_encrypt(sender_private_key, recipient_public_key,
+                                           rumor_json, encrypted_content, sizeof(encrypted_content));
+    free(rumor_json);
+
+    if (encrypt_result != NOSTR_SUCCESS) {
+        return NULL;
+    }
+
+    // Get sender's public key
+    unsigned char sender_public_key[32];
+    if (nostr_ec_public_key_from_private_key(sender_private_key, sender_public_key) != 0) {
+        return NULL;
+    }
+
+    char sender_pubkey_hex[65];
+    nostr_bytes_to_hex(sender_public_key, 32, sender_pubkey_hex);
+
+    // Create seal event (kind 13)
+    cJSON* seal = cJSON_CreateObject();
+    if (!seal) {
+        return NULL;
+    }
+
+    time_t seal_time = random_past_timestamp(max_delay_sec);
+
+    cJSON_AddStringToObject(seal, "pubkey", sender_pubkey_hex);
+    cJSON_AddNumberToObject(seal, "created_at", (double)seal_time);
+    cJSON_AddNumberToObject(seal, "kind", 13);
+    cJSON_AddItemToObject(seal, "tags", cJSON_CreateArray()); // Empty tags array
+    cJSON_AddStringToObject(seal, "content", encrypted_content);
+
+    // Calculate event ID
+    char event_id[65];
+    if (create_event_id(seal, event_id) != 0) {
+        cJSON_Delete(seal);
+        return NULL;
+    }
+    cJSON_AddStringToObject(seal, "id", event_id);
+
+    // Sign the seal
+    unsigned char event_hash[32];
+    if (nostr_hex_to_bytes(event_id, event_hash, 32) != 0) {
+        cJSON_Delete(seal);
+        return NULL;
+    }
+
+    unsigned char signature[64];
+    if (nostr_ec_sign(sender_private_key, event_hash, signature) != 0) {
+        cJSON_Delete(seal);
+        return NULL;
+    }
+
+    char sig_hex[129];
+    nostr_bytes_to_hex(signature, 64, sig_hex);
+    cJSON_AddStringToObject(seal, "sig", sig_hex);
+
+    return seal;
+}
+
+/**
+ * NIP-59: Create a gift wrap (kind 1059) wrapping a seal
+ */
+cJSON* nostr_nip59_create_gift_wrap(cJSON* seal, const char* recipient_public_key_hex, long max_delay_sec) {
+    if (!seal || !recipient_public_key_hex) {
+        return NULL;
+    }
+
+    // Serialize the seal to JSON
+    char* seal_json = cJSON_PrintUnformatted(seal);
+    if (!seal_json) {
+        return NULL;
+    }
+
+    // Generate random private key for gift wrap
+    unsigned char random_private_key[32];
+    if (generate_random_private_key(random_private_key) != 1) {
+        free(seal_json);
+        return NULL;
+    }
+
+    // Get random public key
+    unsigned char random_public_key[32];
+    if (nostr_ec_public_key_from_private_key(random_private_key, random_public_key) != 0) {
+        memory_clear(random_private_key, 32);
+        free(seal_json);
+        return NULL;
+    }
+
+    char random_pubkey_hex[65];
+    nostr_bytes_to_hex(random_public_key, 32, random_pubkey_hex);
+
+    // Convert recipient pubkey hex to bytes
+    unsigned char recipient_public_key[32];
+    if (nostr_hex_to_bytes(recipient_public_key_hex, recipient_public_key, 32) != 0) {
+        memory_clear(random_private_key, 32);
+        free(seal_json);
+        return NULL;
+    }
+
+    // Encrypt the seal using NIP-44
+    char encrypted_content[8192]; // Larger buffer for nested encryption
+    int encrypt_result = nostr_nip44_encrypt(random_private_key, recipient_public_key,
+                                           seal_json, encrypted_content, sizeof(encrypted_content));
+    free(seal_json);
+
+    if (encrypt_result != NOSTR_SUCCESS) {
+        memory_clear(random_private_key, 32);
+        return NULL;
+    }
+
+    // Create gift wrap event (kind 1059)
+    cJSON* gift_wrap = cJSON_CreateObject();
+    if (!gift_wrap) {
+        memory_clear(random_private_key, 32);
+        return NULL;
+    }
+
+    time_t wrap_time = random_past_timestamp(max_delay_sec);
+
+    cJSON_AddStringToObject(gift_wrap, "pubkey", random_pubkey_hex);
+    cJSON_AddNumberToObject(gift_wrap, "created_at", (double)wrap_time);
+    cJSON_AddNumberToObject(gift_wrap, "kind", 1059);
+
+    // Add p tag for recipient
+    cJSON* tags = cJSON_CreateArray();
+    cJSON* p_tag = cJSON_CreateArray();
+    cJSON_AddItemToArray(p_tag, cJSON_CreateString("p"));
+    cJSON_AddItemToArray(p_tag, cJSON_CreateString(recipient_public_key_hex));
+    cJSON_AddItemToArray(tags, p_tag);
+    cJSON_AddItemToObject(gift_wrap, "tags", tags);
+
+    cJSON_AddStringToObject(gift_wrap, "content", encrypted_content);
+
+    // Calculate event ID
+    char event_id[65];
+    if (create_event_id(gift_wrap, event_id) != 0) {
+        memory_clear(random_private_key, 32);
+        cJSON_Delete(gift_wrap);
+        return NULL;
+    }
+    cJSON_AddStringToObject(gift_wrap, "id", event_id);
+
+    // Sign the gift wrap
+    unsigned char event_hash[32];
+    if (nostr_hex_to_bytes(event_id, event_hash, 32) != 0) {
+        memory_clear(random_private_key, 32);
+        cJSON_Delete(gift_wrap);
+        return NULL;
+    }
+
+    unsigned char signature[64];
+    if (nostr_ec_sign(random_private_key, event_hash, signature) != 0) {
+        memory_clear(random_private_key, 32);
+        cJSON_Delete(gift_wrap);
+        return NULL;
+    }
+
+    char sig_hex[129];
+    nostr_bytes_to_hex(signature, 64, sig_hex);
+    cJSON_AddStringToObject(gift_wrap, "sig", sig_hex);
+
+    // Clear the random private key from memory
+    memory_clear(random_private_key, 32);
+
+    return gift_wrap;
+}
+
+/**
+ * NIP-59: Unwrap a gift wrap to get the seal
+ */
+cJSON* nostr_nip59_unwrap_gift(cJSON* gift_wrap, const unsigned char* recipient_private_key) {
+    if (!gift_wrap || !recipient_private_key) {
+        return NULL;
+    }
+
+    // Get the encrypted content
+    cJSON* content_item = cJSON_GetObjectItem(gift_wrap, "content");
+    if (!content_item || !cJSON_IsString(content_item)) {
+        return NULL;
+    }
+
+    const char* encrypted_content = cJSON_GetStringValue(content_item);
+
+    // Get the sender's public key (gift wrap pubkey)
+    cJSON* pubkey_item = cJSON_GetObjectItem(gift_wrap, "pubkey");
+    if (!pubkey_item || !cJSON_IsString(pubkey_item)) {
+        return NULL;
+    }
+
+    const char* sender_pubkey_hex = cJSON_GetStringValue(pubkey_item);
+
+    // Convert sender pubkey hex to bytes
+    unsigned char sender_public_key[32];
+    if (nostr_hex_to_bytes(sender_pubkey_hex, sender_public_key, 32) != 0) {
+        return NULL;
+    }
+
+    // Decrypt the content using NIP-44
+    char decrypted_json[8192];
+    int decrypt_result = nostr_nip44_decrypt(recipient_private_key, sender_public_key,
+                                           encrypted_content, decrypted_json, sizeof(decrypted_json));
+
+    if (decrypt_result != NOSTR_SUCCESS) {
+        return NULL;
+    }
+
+    // Parse the decrypted JSON as the seal event
+    cJSON* seal = cJSON_Parse(decrypted_json);
+    if (!seal) {
+        return NULL;
+    }
+
+    return seal;
+}
+
+/**
+ * NIP-59: Unseal a seal to get the rumor
+ */
+cJSON* nostr_nip59_unseal_rumor(cJSON* seal, const unsigned char* sender_public_key,
+                               const unsigned char* recipient_private_key) {
+    if (!seal || !sender_public_key || !recipient_private_key) {
+        return NULL;
+    }
+
+    // Get the encrypted content
+    cJSON* content_item = cJSON_GetObjectItem(seal, "content");
+    if (!content_item || !cJSON_IsString(content_item)) {
+        return NULL;
+    }
+
+    const char* encrypted_content = cJSON_GetStringValue(content_item);
+
+    // Decrypt the content using NIP-44
+    char decrypted_json[4096];
+    int decrypt_result = nostr_nip44_decrypt(recipient_private_key, sender_public_key,
+                                           encrypted_content, decrypted_json, sizeof(decrypted_json));
+
+    if (decrypt_result != NOSTR_SUCCESS) {
+        return NULL;
+    }
+
+    // Parse the decrypted JSON as the rumor event
+    cJSON* rumor = cJSON_Parse(decrypted_json);
+    if (!rumor) {
+        return NULL;
+    }
+
+    return rumor;
+}
@@ -0,0 +1,76 @@
+/*
+ * NIP-59: Gift Wrap
+ * https://github.com/nostr-protocol/nips/blob/master/59.md
+ */
+
+#ifndef NOSTR_NIP059_H
+#define NOSTR_NIP059_H
+
+#include <stddef.h>
+#include <time.h>
+#include "../cjson/cJSON.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/**
+ * NIP-59: Create a rumor (unsigned event)
+ *
+ * @param kind Event kind
+ * @param content Event content
+ * @param tags Event tags (cJSON array, can be NULL)
+ * @param pubkey_hex Sender's public key in hex format
+ * @param created_at Event timestamp (0 for current time)
+ * @return cJSON object representing the rumor, or NULL on error
+ */
+cJSON* nostr_nip59_create_rumor(int kind, const char* content, cJSON* tags,
+                               const char* pubkey_hex, time_t created_at);
+
+/**
+ * NIP-59: Create a seal (kind 13) wrapping a rumor
+ *
+ * @param rumor The rumor event to seal (cJSON object)
+ * @param sender_private_key 32-byte sender private key
+ * @param recipient_public_key 32-byte recipient public key (x-only)
+ * @param max_delay_sec Maximum random timestamp delay in seconds (0 = no randomization)
+ * @return cJSON object representing the seal event, or NULL on error
+ */
+cJSON* nostr_nip59_create_seal(cJSON* rumor, const unsigned char* sender_private_key,
+                               const unsigned char* recipient_public_key, long max_delay_sec);
+
+/**
+ * NIP-59: Create a gift wrap (kind 1059) wrapping a seal
+ *
+ * @param seal The seal event to wrap (cJSON object)
+ * @param recipient_public_key_hex Recipient's public key in hex format
+ * @param max_delay_sec Maximum random timestamp delay in seconds (0 = no randomization)
+ * @return cJSON object representing the gift wrap event, or NULL on error
+ */
+cJSON* nostr_nip59_create_gift_wrap(cJSON* seal, const char* recipient_public_key_hex, long max_delay_sec);
+
+/**
+ * NIP-59: Unwrap a gift wrap to get the seal
+ *
+ * @param gift_wrap The gift wrap event (cJSON object)
+ * @param recipient_private_key 32-byte recipient private key
+ * @return cJSON object representing the seal event, or NULL on error
+ */
+cJSON* nostr_nip59_unwrap_gift(cJSON* gift_wrap, const unsigned char* recipient_private_key);
+
+/**
+ * NIP-59: Unseal a seal to get the rumor
+ *
+ * @param seal The seal event (cJSON object)
+ * @param sender_public_key 32-byte sender public key (x-only)
+ * @param recipient_private_key 32-byte recipient private key
+ * @return cJSON object representing the rumor event, or NULL on error
+ */
+cJSON* nostr_nip59_unseal_rumor(cJSON* seal, const unsigned char* sender_public_key,
+                               const unsigned char* recipient_private_key);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif // NOSTR_NIP059_H
@@ -0,0 +1,791 @@
+/*
+ * NIP-60: Cashu Wallet Implementation
+ * https://github.com/nostr-protocol/nips/blob/master/60.md
+ */
+
+#include "nip060.h"
+#include "nip044.h"
+#include "utils.h"
+#include <stdlib.h>
+#include <string.h>
+#include <stdio.h>
+
+int nostr_ec_public_key_from_private_key(const unsigned char* private_key, unsigned char* public_key);
+
+static char* nip60_strdup(const char* s) {
+    if (!s) return NULL;
+    size_t len = strlen(s);
+    char* out = (char*)malloc(len + 1);
+    if (!out) return NULL;
+    memcpy(out, s, len + 1);
+    return out;
+}
+
+static const char* nip60_marker_to_string(nostr_nip60_ref_marker_t marker) {
+    switch (marker) {
+        case NOSTR_NIP60_REF_CREATED: return "created";
+        case NOSTR_NIP60_REF_DESTROYED: return "destroyed";
+        case NOSTR_NIP60_REF_REDEEMED: return "redeemed";
+        default: return "created";
+    }
+}
+
+static nostr_nip60_ref_marker_t nip60_string_to_marker(const char* s) {
+    if (!s) return NOSTR_NIP60_REF_CREATED;
+    if (strcmp(s, "created") == 0) return NOSTR_NIP60_REF_CREATED;
+    if (strcmp(s, "destroyed") == 0) return NOSTR_NIP60_REF_DESTROYED;
+    if (strcmp(s, "redeemed") == 0) return NOSTR_NIP60_REF_REDEEMED;
+    return NOSTR_NIP60_REF_CREATED;
+}
+
+static const char* nip60_direction_to_string(nostr_nip60_direction_t direction) {
+    return (direction == NOSTR_NIP60_DIRECTION_OUT) ? "out" : "in";
+}
+
+static nostr_nip60_direction_t nip60_string_to_direction(const char* s) {
+    if (s && strcmp(s, "out") == 0) return NOSTR_NIP60_DIRECTION_OUT;
+    return NOSTR_NIP60_DIRECTION_IN;
+}
+
+static int nip60_encrypt_self(const unsigned char* private_key,
+                              const char* plaintext,
+                              char* output,
+                              size_t output_size) {
+    if (!private_key || !plaintext || !output || output_size == 0) {
+        return NOSTR_ERROR_INVALID_INPUT;
+    }
+
+    unsigned char pubkey[32];
+    if (nostr_ec_public_key_from_private_key(private_key, pubkey) != 0) {
+        return NOSTR_ERROR_CRYPTO_FAILED;
+    }
+
+    return nostr_nip44_encrypt(private_key, pubkey, plaintext, output, output_size);
+}
+
+static int nip60_decrypt_event_content(cJSON* event,
+                                       const unsigned char* private_key,
+                                       char* output,
+                                       size_t output_size) {
+    if (!event || !private_key || !output || output_size == 0) {
+        return NOSTR_ERROR_INVALID_INPUT;
+    }
+
+    cJSON* pubkey_item = cJSON_GetObjectItem(event, "pubkey");
+    cJSON* content_item = cJSON_GetObjectItem(event, "content");
+    if (!pubkey_item || !content_item || !cJSON_IsString(pubkey_item) || !cJSON_IsString(content_item)) {
+        return NOSTR_ERROR_NIP60_DECRYPT_FAILED;
+    }
+
+    const char* pubkey_hex = cJSON_GetStringValue(pubkey_item);
+    const char* content = cJSON_GetStringValue(content_item);
+    if (!pubkey_hex || !content) {
+        return NOSTR_ERROR_NIP60_DECRYPT_FAILED;
+    }
+
+    unsigned char sender_pubkey[32];
+    if (nostr_hex_to_bytes(pubkey_hex, sender_pubkey, 32) != 0) {
+        return NOSTR_ERROR_NIP60_DECRYPT_FAILED;
+    }
+
+    int rc = nostr_nip44_decrypt(private_key, sender_pubkey, content, output, output_size);
+    if (rc != NOSTR_SUCCESS) {
+        return NOSTR_ERROR_NIP60_DECRYPT_FAILED;
+    }
+
+    return NOSTR_SUCCESS;
+}
+
+uint64_t nostr_nip60_sum_proofs(const nostr_cashu_proof_t* proofs, int proof_count) {
+    if (!proofs || proof_count <= 0) return 0;
+
+    uint64_t total = 0;
+    for (int i = 0; i < proof_count; i++) {
+        total += proofs[i].amount;
+    }
+    return total;
+}
+
+void nostr_nip60_free_proofs(nostr_cashu_proof_t* proofs, int proof_count) {
+    if (!proofs) return;
+
+    for (int i = 0; i < proof_count; i++) {
+        free(proofs[i].secret);
+        free(proofs[i].C);
+        proofs[i].secret = NULL;
+        proofs[i].C = NULL;
+    }
+    free(proofs);
+}
+
+cJSON* nostr_nip60_proofs_to_json(const nostr_cashu_proof_t* proofs, int proof_count) {
+    if (!proofs || proof_count < 0) return NULL;
+
+    cJSON* arr = cJSON_CreateArray();
+    if (!arr) return NULL;
+
+    for (int i = 0; i < proof_count; i++) {
+        cJSON* obj = cJSON_CreateObject();
+        if (!obj) {
+            cJSON_Delete(arr);
+            return NULL;
+        }
+
+        cJSON_AddStringToObject(obj, "id", proofs[i].id);
+        cJSON_AddNumberToObject(obj, "amount", (double)proofs[i].amount);
+        cJSON_AddStringToObject(obj, "secret", proofs[i].secret ? proofs[i].secret : "");
+        cJSON_AddStringToObject(obj, "C", proofs[i].C ? proofs[i].C : "");
+        cJSON_AddItemToArray(arr, obj);
+    }
+
+    return arr;
+}
+
+int nostr_nip60_proofs_from_json(cJSON* json_array,
+                                 nostr_cashu_proof_t** proofs_out,
+                                 int* proof_count_out) {
+    if (!json_array || !cJSON_IsArray(json_array) || !proofs_out || !proof_count_out) {
+        return NOSTR_ERROR_INVALID_INPUT;
+    }
+
+    *proofs_out = NULL;
+    *proof_count_out = 0;
+
+    int count = cJSON_GetArraySize(json_array);
+    if (count <= 0) {
+        return NOSTR_SUCCESS;
+    }
+
+    nostr_cashu_proof_t* proofs = (nostr_cashu_proof_t*)calloc((size_t)count, sizeof(nostr_cashu_proof_t));
+    if (!proofs) {
+        return NOSTR_ERROR_MEMORY_FAILED;
+    }
+
+    for (int i = 0; i < count; i++) {
+        cJSON* p = cJSON_GetArrayItem(json_array, i);
+        if (!p || !cJSON_IsObject(p)) {
+            nostr_nip60_free_proofs(proofs, count);
+            return NOSTR_ERROR_NIP60_INVALID_PROOFS;
+        }
+
+        cJSON* id_item = cJSON_GetObjectItem(p, "id");
+        cJSON* amount_item = cJSON_GetObjectItem(p, "amount");
+        cJSON* secret_item = cJSON_GetObjectItem(p, "secret");
+        cJSON* c_item = cJSON_GetObjectItem(p, "C");
+
+        if (!id_item || !amount_item || !secret_item || !c_item ||
+            !cJSON_IsString(id_item) || !cJSON_IsNumber(amount_item) ||
+            !cJSON_IsString(secret_item) || !cJSON_IsString(c_item)) {
+            nostr_nip60_free_proofs(proofs, count);
+            return NOSTR_ERROR_NIP60_INVALID_PROOFS;
+        }
+
+        const char* id = cJSON_GetStringValue(id_item);
+        const char* secret = cJSON_GetStringValue(secret_item);
+        const char* C = cJSON_GetStringValue(c_item);
+        if (!id || !secret || !C) {
+            nostr_nip60_free_proofs(proofs, count);
+            return NOSTR_ERROR_NIP60_INVALID_PROOFS;
+        }
+
+        strncpy(proofs[i].id, id, sizeof(proofs[i].id) - 1);
+        proofs[i].id[sizeof(proofs[i].id) - 1] = '\0';
+        proofs[i].amount = (uint64_t)cJSON_GetNumberValue(amount_item);
+        proofs[i].secret = nip60_strdup(secret);
+        proofs[i].C = nip60_strdup(C);
+
+        if (!proofs[i].secret || !proofs[i].C) {
+            nostr_nip60_free_proofs(proofs, count);
+            return NOSTR_ERROR_MEMORY_FAILED;
+        }
+    }
+
+    *proofs_out = proofs;
+    *proof_count_out = count;
+    return NOSTR_SUCCESS;
+}
+
+cJSON* nostr_nip60_create_wallet_event(const nostr_nip60_wallet_data_t* wallet_data,
+                                       const unsigned char* private_key,
+                                       time_t timestamp) {
+    if (!wallet_data || !private_key || wallet_data->mint_count <= 0) {
+        return NULL;
+    }
+
+    cJSON* payload = cJSON_CreateArray();
+    if (!payload) return NULL;
+
+    cJSON* priv_row = cJSON_CreateArray();
+    if (!priv_row) {
+        cJSON_Delete(payload);
+        return NULL;
+    }
+    cJSON_AddItemToArray(priv_row, cJSON_CreateString("privkey"));
+    cJSON_AddItemToArray(priv_row, cJSON_CreateString(wallet_data->privkey));
+    cJSON_AddItemToArray(payload, priv_row);
+
+    for (int i = 0; i < wallet_data->mint_count; i++) {
+        if (!wallet_data->mint_urls || !wallet_data->mint_urls[i]) continue;
+        cJSON* mint_row = cJSON_CreateArray();
+        if (!mint_row) {
+            cJSON_Delete(payload);
+            return NULL;
+        }
+        cJSON_AddItemToArray(mint_row, cJSON_CreateString("mint"));
+        cJSON_AddItemToArray(mint_row, cJSON_CreateString(wallet_data->mint_urls[i]));
+        cJSON_AddItemToArray(payload, mint_row);
+    }
+
+    char* plain = cJSON_PrintUnformatted(payload);
+    cJSON_Delete(payload);
+    if (!plain) return NULL;
+
+    char encrypted[65536];
+    int rc = nip60_encrypt_self(private_key, plain, encrypted, sizeof(encrypted));
+    free(plain);
+    if (rc != NOSTR_SUCCESS) return NULL;
+
+    return nostr_create_and_sign_event(NOSTR_NIP60_WALLET_KIND, encrypted, NULL, private_key, timestamp);
+}
+
+int nostr_nip60_parse_wallet_event(cJSON* event,
+                                   const unsigned char* private_key,
+                                   nostr_nip60_wallet_data_t* wallet_data_out) {
+    if (!event || !private_key || !wallet_data_out) {
+        return NOSTR_ERROR_INVALID_INPUT;
+    }
+
+    memset(wallet_data_out, 0, sizeof(*wallet_data_out));
+
+    cJSON* kind_item = cJSON_GetObjectItem(event, "kind");
+    if (!kind_item || !cJSON_IsNumber(kind_item) || (int)cJSON_GetNumberValue(kind_item) != NOSTR_NIP60_WALLET_KIND) {
+        return NOSTR_ERROR_NIP60_INVALID_WALLET;
+    }
+
+    char decrypted[65536];
+    int rc = nip60_decrypt_event_content(event, private_key, decrypted, sizeof(decrypted));
+    if (rc != NOSTR_SUCCESS) return rc;
+
+    cJSON* payload = cJSON_Parse(decrypted);
+    if (!payload || !cJSON_IsArray(payload)) {
+        cJSON_Delete(payload);
+        return NOSTR_ERROR_NIP60_INVALID_WALLET;
+    }
+
+    int mint_count = 0;
+    cJSON* row = NULL;
+    cJSON_ArrayForEach(row, payload) {
+        if (!cJSON_IsArray(row) || cJSON_GetArraySize(row) < 2) continue;
+        cJSON* k = cJSON_GetArrayItem(row, 0);
+        cJSON* v = cJSON_GetArrayItem(row, 1);
+        if (!k || !v || !cJSON_IsString(k) || !cJSON_IsString(v)) continue;
+        const char* key = cJSON_GetStringValue(k);
+        if (key && strcmp(key, "mint") == 0) mint_count++;
+    }
+
+    if (mint_count > 0) {
+        wallet_data_out->mint_urls = (char**)calloc((size_t)mint_count, sizeof(char*));
+        if (!wallet_data_out->mint_urls) {
+            cJSON_Delete(payload);
+            return NOSTR_ERROR_MEMORY_FAILED;
+        }
+    }
+
+    int mint_idx = 0;
+    cJSON_ArrayForEach(row, payload) {
+        if (!cJSON_IsArray(row) || cJSON_GetArraySize(row) < 2) continue;
+        cJSON* k = cJSON_GetArrayItem(row, 0);
+        cJSON* v = cJSON_GetArrayItem(row, 1);
+        if (!k || !v || !cJSON_IsString(k) || !cJSON_IsString(v)) continue;
+
+        const char* key = cJSON_GetStringValue(k);
+        const char* val = cJSON_GetStringValue(v);
+        if (!key || !val) continue;
+
+        if (strcmp(key, "privkey") == 0) {
+            strncpy(wallet_data_out->privkey, val, sizeof(wallet_data_out->privkey) - 1);
+            wallet_data_out->privkey[sizeof(wallet_data_out->privkey) - 1] = '\0';
+        } else if (strcmp(key, "mint") == 0 && mint_idx < mint_count) {
+            wallet_data_out->mint_urls[mint_idx] = nip60_strdup(val);
+            if (!wallet_data_out->mint_urls[mint_idx]) {
+                cJSON_Delete(payload);
+                nostr_nip60_free_wallet_data(wallet_data_out);
+                return NOSTR_ERROR_MEMORY_FAILED;
+            }
+            mint_idx++;
+        }
+    }
+
+    wallet_data_out->mint_count = mint_idx;
+    cJSON_Delete(payload);
+
+    if (wallet_data_out->privkey[0] == '\0' || wallet_data_out->mint_count == 0) {
+        nostr_nip60_free_wallet_data(wallet_data_out);
+        return NOSTR_ERROR_NIP60_INVALID_WALLET;
+    }
+
+    return NOSTR_SUCCESS;
+}
+
+void nostr_nip60_free_wallet_data(nostr_nip60_wallet_data_t* data) {
+    if (!data) return;
+    if (data->mint_urls) {
+        for (int i = 0; i < data->mint_count; i++) {
+            free(data->mint_urls[i]);
+        }
+        free(data->mint_urls);
+    }
+    memset(data, 0, sizeof(*data));
+}
+
+cJSON* nostr_nip60_create_token_event(const nostr_nip60_token_data_t* token_data,
+                                      const unsigned char* private_key,
+                                      time_t timestamp) {
+    if (!token_data || !private_key || !token_data->mint_url ||
+        !token_data->proofs || token_data->proof_count <= 0) {
+        return NULL;
+    }
+
+    cJSON* payload = cJSON_CreateObject();
+    if (!payload) return NULL;
+
+    cJSON_AddStringToObject(payload, "mint", token_data->mint_url);
+
+    cJSON* proofs = nostr_nip60_proofs_to_json(token_data->proofs, token_data->proof_count);
+    if (!proofs) {
+        cJSON_Delete(payload);
+        return NULL;
+    }
+    cJSON_AddItemToObject(payload, "proofs", proofs);
+
+    if (token_data->deleted_token_ids && token_data->deleted_count > 0) {
+        cJSON* del = cJSON_CreateArray();
+        if (!del) {
+            cJSON_Delete(payload);
+            return NULL;
+        }
+        for (int i = 0; i < token_data->deleted_count; i++) {
+            if (token_data->deleted_token_ids[i]) {
+                cJSON_AddItemToArray(del, cJSON_CreateString(token_data->deleted_token_ids[i]));
+            }
+        }
+        cJSON_AddItemToObject(payload, "del", del);
+    }
+
+    char* plain = cJSON_PrintUnformatted(payload);
+    cJSON_Delete(payload);
+    if (!plain) return NULL;
+
+    char encrypted[131072];
+    int rc = nip60_encrypt_self(private_key, plain, encrypted, sizeof(encrypted));
+    free(plain);
+    if (rc != NOSTR_SUCCESS) return NULL;
+
+    return nostr_create_and_sign_event(NOSTR_NIP60_TOKEN_KIND, encrypted, NULL, private_key, timestamp);
+}
+
+int nostr_nip60_parse_token_event(cJSON* event,
+                                  const unsigned char* private_key,
+                                  nostr_nip60_token_data_t* token_data_out) {
+    if (!event || !private_key || !token_data_out) {
+        return NOSTR_ERROR_INVALID_INPUT;
+    }
+
+    memset(token_data_out, 0, sizeof(*token_data_out));
+
+    cJSON* kind_item = cJSON_GetObjectItem(event, "kind");
+    if (!kind_item || !cJSON_IsNumber(kind_item) || (int)cJSON_GetNumberValue(kind_item) != NOSTR_NIP60_TOKEN_KIND) {
+        return NOSTR_ERROR_NIP60_INVALID_TOKEN;
+    }
+
+    char decrypted[131072];
+    int rc = nip60_decrypt_event_content(event, private_key, decrypted, sizeof(decrypted));
+    if (rc != NOSTR_SUCCESS) return rc;
+
+    cJSON* payload = cJSON_Parse(decrypted);
+    if (!payload || !cJSON_IsObject(payload)) {
+        cJSON_Delete(payload);
+        return NOSTR_ERROR_NIP60_INVALID_TOKEN;
+    }
+
+    cJSON* mint_item = cJSON_GetObjectItem(payload, "mint");
+    cJSON* proofs_item = cJSON_GetObjectItem(payload, "proofs");
+    if (!mint_item || !proofs_item || !cJSON_IsString(mint_item) || !cJSON_IsArray(proofs_item)) {
+        cJSON_Delete(payload);
+        return NOSTR_ERROR_NIP60_INVALID_TOKEN;
+    }
+
+    const char* mint_url = cJSON_GetStringValue(mint_item);
+    token_data_out->mint_url = nip60_strdup(mint_url ? mint_url : "");
+    if (!token_data_out->mint_url) {
+        cJSON_Delete(payload);
+        return NOSTR_ERROR_MEMORY_FAILED;
+    }
+
+    rc = nostr_nip60_proofs_from_json(proofs_item, &token_data_out->proofs, &token_data_out->proof_count);
+    if (rc != NOSTR_SUCCESS) {
+        cJSON_Delete(payload);
+        nostr_nip60_free_token_data(token_data_out);
+        return rc;
+    }
+
+    cJSON* del_item = cJSON_GetObjectItem(payload, "del");
+    if (del_item && cJSON_IsArray(del_item)) {
+        int del_count = cJSON_GetArraySize(del_item);
+        if (del_count > 0) {
+            token_data_out->deleted_token_ids = (char**)calloc((size_t)del_count, sizeof(char*));
+            if (!token_data_out->deleted_token_ids) {
+                cJSON_Delete(payload);
+                nostr_nip60_free_token_data(token_data_out);
+                return NOSTR_ERROR_MEMORY_FAILED;
+            }
+
+            for (int i = 0; i < del_count; i++) {
+                cJSON* it = cJSON_GetArrayItem(del_item, i);
+                if (!it || !cJSON_IsString(it)) continue;
+                const char* s = cJSON_GetStringValue(it);
+                if (!s) continue;
+                token_data_out->deleted_token_ids[token_data_out->deleted_count] = nip60_strdup(s);
+                if (!token_data_out->deleted_token_ids[token_data_out->deleted_count]) {
+                    cJSON_Delete(payload);
+                    nostr_nip60_free_token_data(token_data_out);
+                    return NOSTR_ERROR_MEMORY_FAILED;
+                }
+                token_data_out->deleted_count++;
+            }
+        }
+    }
+
+    cJSON_Delete(payload);
+    return NOSTR_SUCCESS;
+}
+
+void nostr_nip60_free_token_data(nostr_nip60_token_data_t* data) {
+    if (!data) return;
+
+    free(data->mint_url);
+    nostr_nip60_free_proofs(data->proofs, data->proof_count);
+
+    if (data->deleted_token_ids) {
+        for (int i = 0; i < data->deleted_count; i++) {
+            free(data->deleted_token_ids[i]);
+        }
+        free(data->deleted_token_ids);
+    }
+
+    memset(data, 0, sizeof(*data));
+}
+
+cJSON* nostr_nip60_create_token_deletion(const char* token_event_id,
+                                         const unsigned char* private_key,
+                                         time_t timestamp) {
+    if (!token_event_id || !private_key) return NULL;
+
+    cJSON* tags = cJSON_CreateArray();
+    if (!tags) return NULL;
+
+    cJSON* e_tag = cJSON_CreateArray();
+    cJSON_AddItemToArray(e_tag, cJSON_CreateString("e"));
+    cJSON_AddItemToArray(e_tag, cJSON_CreateString(token_event_id));
+    cJSON_AddItemToArray(tags, e_tag);
+
+    cJSON* k_tag = cJSON_CreateArray();
+    cJSON_AddItemToArray(k_tag, cJSON_CreateString("k"));
+    cJSON_AddItemToArray(k_tag, cJSON_CreateString("7375"));
+    cJSON_AddItemToArray(tags, k_tag);
+
+    cJSON* evt = nostr_create_and_sign_event(5, "NIP-60 token spent", tags, private_key, timestamp);
+    cJSON_Delete(tags);
+    return evt;
+}
+
+cJSON* nostr_nip60_create_rollover_token(const nostr_nip60_token_data_t* remaining_proofs,
+                                         const char** deleted_event_ids,
+                                         int deleted_count,
+                                         const unsigned char* private_key,
+                                         time_t timestamp) {
+    if (!remaining_proofs || !private_key) return NULL;
+
+    nostr_nip60_token_data_t token = *remaining_proofs;
+    token.deleted_token_ids = (char**)deleted_event_ids;
+    token.deleted_count = deleted_count;
+
+    return nostr_nip60_create_token_event(&token, private_key, timestamp);
+}
+
+cJSON* nostr_nip60_create_history_event(const nostr_nip60_history_data_t* history_data,
+                                        const unsigned char* private_key,
+                                        time_t timestamp) {
+    if (!history_data || !private_key) return NULL;
+
+    cJSON* payload = cJSON_CreateArray();
+    if (!payload) return NULL;
+
+    cJSON* dir = cJSON_CreateArray();
+    cJSON_AddItemToArray(dir, cJSON_CreateString("direction"));
+    cJSON_AddItemToArray(dir, cJSON_CreateString(nip60_direction_to_string(history_data->direction)));
+    cJSON_AddItemToArray(payload, dir);
+
+    char amount_buf[32];
+    snprintf(amount_buf, sizeof(amount_buf), "%llu", (unsigned long long)history_data->amount);
+    cJSON* amt = cJSON_CreateArray();
+    cJSON_AddItemToArray(amt, cJSON_CreateString("amount"));
+    cJSON_AddItemToArray(amt, cJSON_CreateString(amount_buf));
+    cJSON_AddItemToArray(payload, amt);
+
+    for (int i = 0; i < history_data->ref_count; i++) {
+        cJSON* e = cJSON_CreateArray();
+        cJSON_AddItemToArray(e, cJSON_CreateString("e"));
+        cJSON_AddItemToArray(e, cJSON_CreateString(history_data->refs[i].event_id));
+        cJSON_AddItemToArray(e, cJSON_CreateString(history_data->refs[i].relay_hint));
+        cJSON_AddItemToArray(e, cJSON_CreateString(nip60_marker_to_string(history_data->refs[i].marker)));
+        cJSON_AddItemToArray(payload, e);
+    }
+
+    char* plain = cJSON_PrintUnformatted(payload);
+    cJSON_Delete(payload);
+    if (!plain) return NULL;
+
+    char encrypted[65536];
+    int rc = nip60_encrypt_self(private_key, plain, encrypted, sizeof(encrypted));
+    free(plain);
+    if (rc != NOSTR_SUCCESS) return NULL;
+
+    cJSON* tags = cJSON_CreateArray();
+    if (!tags) return NULL;
+
+    for (int i = 0; i < history_data->ref_count; i++) {
+        if (history_data->refs[i].marker != NOSTR_NIP60_REF_REDEEMED) continue;
+
+        cJSON* e = cJSON_CreateArray();
+        cJSON_AddItemToArray(e, cJSON_CreateString("e"));
+        cJSON_AddItemToArray(e, cJSON_CreateString(history_data->refs[i].event_id));
+        cJSON_AddItemToArray(e, cJSON_CreateString(history_data->refs[i].relay_hint));
+        cJSON_AddItemToArray(e, cJSON_CreateString("redeemed"));
+        cJSON_AddItemToArray(tags, e);
+    }
+
+    cJSON* evt = nostr_create_and_sign_event(NOSTR_NIP60_HISTORY_KIND, encrypted, tags, private_key, timestamp);
+    cJSON_Delete(tags);
+    return evt;
+}
+
+int nostr_nip60_parse_history_event(cJSON* event,
+                                    const unsigned char* private_key,
+                                    nostr_nip60_history_data_t* history_data_out) {
+    if (!event || !private_key || !history_data_out) {
+        return NOSTR_ERROR_INVALID_INPUT;
+    }
+
+    memset(history_data_out, 0, sizeof(*history_data_out));
+
+    cJSON* kind_item = cJSON_GetObjectItem(event, "kind");
+    if (!kind_item || !cJSON_IsNumber(kind_item) || (int)cJSON_GetNumberValue(kind_item) != NOSTR_NIP60_HISTORY_KIND) {
+        return NOSTR_ERROR_NIP60_INVALID_HISTORY;
+    }
+
+    char decrypted[65536];
+    int rc = nip60_decrypt_event_content(event, private_key, decrypted, sizeof(decrypted));
+    if (rc != NOSTR_SUCCESS) return rc;
+
+    cJSON* payload = cJSON_Parse(decrypted);
+    if (!payload || !cJSON_IsArray(payload)) {
+        cJSON_Delete(payload);
+        return NOSTR_ERROR_NIP60_INVALID_HISTORY;
+    }
+
+    int ref_count = 0;
+    cJSON* row = NULL;
+    cJSON_ArrayForEach(row, payload) {
+        if (!cJSON_IsArray(row) || cJSON_GetArraySize(row) < 2) continue;
+        cJSON* k = cJSON_GetArrayItem(row, 0);
+        if (!k || !cJSON_IsString(k)) continue;
+        const char* key = cJSON_GetStringValue(k);
+        if (key && strcmp(key, "e") == 0) ref_count++;
+    }
+
+    if (ref_count > 0) {
+        history_data_out->refs = (nostr_nip60_history_ref_t*)calloc((size_t)ref_count, sizeof(nostr_nip60_history_ref_t));
+        if (!history_data_out->refs) {
+            cJSON_Delete(payload);
+            return NOSTR_ERROR_MEMORY_FAILED;
+        }
+    }
+
+    int ref_idx = 0;
+    cJSON_ArrayForEach(row, payload) {
+        if (!cJSON_IsArray(row) || cJSON_GetArraySize(row) < 2) continue;
+
+        cJSON* k = cJSON_GetArrayItem(row, 0);
+        cJSON* v = cJSON_GetArrayItem(row, 1);
+        if (!k || !v || !cJSON_IsString(k) || !cJSON_IsString(v)) continue;
+
+        const char* key = cJSON_GetStringValue(k);
+        const char* val = cJSON_GetStringValue(v);
+        if (!key || !val) continue;
+
+        if (strcmp(key, "direction") == 0) {
+            history_data_out->direction = nip60_string_to_direction(val);
+        } else if (strcmp(key, "amount") == 0) {
+            history_data_out->amount = (uint64_t)strtoull(val, NULL, 10);
+        } else if (strcmp(key, "e") == 0 && ref_idx < ref_count) {
+            strncpy(history_data_out->refs[ref_idx].event_id, val,
+                    sizeof(history_data_out->refs[ref_idx].event_id) - 1);
+
+            cJSON* relay_item = cJSON_GetArrayItem(row, 2);
+            cJSON* marker_item = cJSON_GetArrayItem(row, 3);
+
+            if (relay_item && cJSON_IsString(relay_item)) {
+                const char* relay = cJSON_GetStringValue(relay_item);
+                if (relay) {
+                    strncpy(history_data_out->refs[ref_idx].relay_hint, relay,
+                            sizeof(history_data_out->refs[ref_idx].relay_hint) - 1);
+                }
+            }
+
+            if (marker_item && cJSON_IsString(marker_item)) {
+                const char* m = cJSON_GetStringValue(marker_item);
+                history_data_out->refs[ref_idx].marker = nip60_string_to_marker(m);
+            } else {
+                history_data_out->refs[ref_idx].marker = NOSTR_NIP60_REF_CREATED;
+            }
+
+            ref_idx++;
+        }
+    }
+
+    history_data_out->ref_count = ref_idx;
+    cJSON_Delete(payload);
+    return NOSTR_SUCCESS;
+}
+
+void nostr_nip60_free_history_data(nostr_nip60_history_data_t* data) {
+    if (!data) return;
+    free(data->refs);
+    memset(data, 0, sizeof(*data));
+}
+
+cJSON* nostr_nip60_create_quote_event(const char* quote_id,
+                                      const char* mint_url,
+                                      time_t expiration,
+                                      const unsigned char* private_key,
+                                      time_t timestamp) {
+    if (!quote_id || !mint_url || !private_key || expiration <= 0) {
+        return NULL;
+    }
+
+    char encrypted[4096];
+    int rc = nip60_encrypt_self(private_key, quote_id, encrypted, sizeof(encrypted));
+    if (rc != NOSTR_SUCCESS) return NULL;
+
+    cJSON* tags = cJSON_CreateArray();
+    if (!tags) return NULL;
+
+    cJSON* exp_tag = cJSON_CreateArray();
+    cJSON_AddItemToArray(exp_tag, cJSON_CreateString("expiration"));
+
+    char exp_buf[32];
+    snprintf(exp_buf, sizeof(exp_buf), "%lld", (long long)expiration);
+    cJSON_AddItemToArray(exp_tag, cJSON_CreateString(exp_buf));
+    cJSON_AddItemToArray(tags, exp_tag);
+
+    cJSON* mint_tag = cJSON_CreateArray();
+    cJSON_AddItemToArray(mint_tag, cJSON_CreateString("mint"));
+    cJSON_AddItemToArray(mint_tag, cJSON_CreateString(mint_url));
+    cJSON_AddItemToArray(tags, mint_tag);
+
+    cJSON* evt = nostr_create_and_sign_event(NOSTR_NIP60_QUOTE_KIND, encrypted, tags, private_key, timestamp);
+    cJSON_Delete(tags);
+    return evt;
+}
+
+int nostr_nip60_parse_quote_event(cJSON* event,
+                                  const unsigned char* private_key,
+                                  char* quote_id_out,
+                                  size_t quote_id_size,
+                                  char* mint_url_out,
+                                  size_t mint_url_size,
+                                  time_t* expiration_out) {
+    if (!event || !private_key || !quote_id_out || quote_id_size == 0 ||
+        !mint_url_out || mint_url_size == 0) {
+        return NOSTR_ERROR_INVALID_INPUT;
+    }
+
+    cJSON* kind_item = cJSON_GetObjectItem(event, "kind");
+    if (!kind_item || !cJSON_IsNumber(kind_item) || (int)cJSON_GetNumberValue(kind_item) != NOSTR_NIP60_QUOTE_KIND) {
+        return NOSTR_ERROR_NIP60_INVALID_QUOTE;
+    }
+
+    char decrypted[4096];
+    int rc = nip60_decrypt_event_content(event, private_key, decrypted, sizeof(decrypted));
+    if (rc != NOSTR_SUCCESS) return rc;
+
+    strncpy(quote_id_out, decrypted, quote_id_size - 1);
+    quote_id_out[quote_id_size - 1] = '\0';
+
+    mint_url_out[0] = '\0';
+    if (expiration_out) *expiration_out = 0;
+
+    cJSON* tags = cJSON_GetObjectItem(event, "tags");
+    if (tags && cJSON_IsArray(tags)) {
+        cJSON* tag = NULL;
+        cJSON_ArrayForEach(tag, tags) {
+            if (!cJSON_IsArray(tag) || cJSON_GetArraySize(tag) < 2) continue;
+            cJSON* k = cJSON_GetArrayItem(tag, 0);
+            cJSON* v = cJSON_GetArrayItem(tag, 1);
+            if (!k || !v || !cJSON_IsString(k) || !cJSON_IsString(v)) continue;
+
+            const char* key = cJSON_GetStringValue(k);
+            const char* val = cJSON_GetStringValue(v);
+            if (!key || !val) continue;
+
+            if (strcmp(key, "mint") == 0) {
+                strncpy(mint_url_out, val, mint_url_size - 1);
+                mint_url_out[mint_url_size - 1] = '\0';
+            } else if (strcmp(key, "expiration") == 0 && expiration_out) {
+                *expiration_out = (time_t)strtoll(val, NULL, 10);
+            }
+        }
+    }
+
+    return NOSTR_SUCCESS;
+}
+
+cJSON* nostr_nip60_create_wallet_filter(const char* pubkey_hex) {
+    if (!pubkey_hex) return NULL;
+
+    cJSON* filter = cJSON_CreateObject();
+    if (!filter) return NULL;
+
+    cJSON* kinds = cJSON_CreateArray();
+    cJSON_AddItemToArray(kinds, cJSON_CreateNumber(NOSTR_NIP60_WALLET_KIND));
+    cJSON_AddItemToArray(kinds, cJSON_CreateNumber(NOSTR_NIP60_TOKEN_KIND));
+    cJSON_AddItemToObject(filter, "kinds", kinds);
+
+    cJSON* authors = cJSON_CreateArray();
+    cJSON_AddItemToArray(authors, cJSON_CreateString(pubkey_hex));
+    cJSON_AddItemToObject(filter, "authors", authors);
+
+    return filter;
+}
+
+cJSON* nostr_nip60_create_history_filter(const char* pubkey_hex, time_t since) {
+    if (!pubkey_hex) return NULL;
+
+    cJSON* filter = cJSON_CreateObject();
+    if (!filter) return NULL;
+
+    cJSON* kinds = cJSON_CreateArray();
+    cJSON_AddItemToArray(kinds, cJSON_CreateNumber(NOSTR_NIP60_HISTORY_KIND));
+    cJSON_AddItemToObject(filter, "kinds", kinds);
+
+    cJSON* authors = cJSON_CreateArray();
+    cJSON_AddItemToArray(authors, cJSON_CreateString(pubkey_hex));
+    cJSON_AddItemToObject(filter, "authors", authors);
+
+    if (since > 0) {
+        cJSON_AddNumberToObject(filter, "since", (double)since);
+    }
+
+    return filter;
+}
@@ -0,0 +1,146 @@
+/*
+ * NIP-60: Cashu Wallet
+ * https://github.com/nostr-protocol/nips/blob/master/60.md
+ */
+
+#ifndef NOSTR_NIP060_H
+#define NOSTR_NIP060_H
+
+#include <stddef.h>
+#include <stdint.h>
+#include <time.h>
+#include "nip001.h"
+#include "nostr_common.h"
+#include "../cjson/cJSON.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#define NOSTR_NIP60_WALLET_KIND 17375
+#define NOSTR_NIP60_TOKEN_KIND 7375
+#define NOSTR_NIP60_HISTORY_KIND 7376
+#define NOSTR_NIP60_QUOTE_KIND 7374
+
+#define NOSTR_CASHU_KEYSET_ID_HEX_SIZE 17
+#define NOSTR_CASHU_PUBKEY_HEX_SIZE 67
+#define NOSTR_CASHU_EVENT_ID_HEX_SIZE 65
+
+typedef struct {
+    char id[NOSTR_CASHU_KEYSET_ID_HEX_SIZE];
+    uint64_t amount;
+    char* secret;
+    char* C;
+} nostr_cashu_proof_t;
+
+typedef struct {
+    char privkey[65];
+    char** mint_urls;
+    int mint_count;
+} nostr_nip60_wallet_data_t;
+
+typedef struct {
+    char* mint_url;
+    nostr_cashu_proof_t* proofs;
+    int proof_count;
+    char** deleted_token_ids;
+    int deleted_count;
+} nostr_nip60_token_data_t;
+
+typedef enum {
+    NOSTR_NIP60_DIRECTION_IN = 0,
+    NOSTR_NIP60_DIRECTION_OUT = 1
+} nostr_nip60_direction_t;
+
+typedef enum {
+    NOSTR_NIP60_REF_CREATED = 0,
+    NOSTR_NIP60_REF_DESTROYED = 1,
+    NOSTR_NIP60_REF_REDEEMED = 2
+} nostr_nip60_ref_marker_t;
+
+typedef struct {
+    char event_id[NOSTR_CASHU_EVENT_ID_HEX_SIZE];
+    char relay_hint[256];
+    nostr_nip60_ref_marker_t marker;
+} nostr_nip60_history_ref_t;
+
+typedef struct {
+    nostr_nip60_direction_t direction;
+    uint64_t amount;
+    nostr_nip60_history_ref_t* refs;
+    int ref_count;
+} nostr_nip60_history_data_t;
+
+cJSON* nostr_nip60_create_wallet_event(const nostr_nip60_wallet_data_t* wallet_data,
+                                       const unsigned char* private_key,
+                                       time_t timestamp);
+
+int nostr_nip60_parse_wallet_event(cJSON* event,
+                                   const unsigned char* private_key,
+                                   nostr_nip60_wallet_data_t* wallet_data_out);
+
+void nostr_nip60_free_wallet_data(nostr_nip60_wallet_data_t* data);
+
+cJSON* nostr_nip60_create_token_event(const nostr_nip60_token_data_t* token_data,
+                                      const unsigned char* private_key,
+                                      time_t timestamp);
+
+int nostr_nip60_parse_token_event(cJSON* event,
+                                  const unsigned char* private_key,
+                                  nostr_nip60_token_data_t* token_data_out);
+
+void nostr_nip60_free_token_data(nostr_nip60_token_data_t* data);
+
+cJSON* nostr_nip60_create_token_deletion(const char* token_event_id,
+                                         const unsigned char* private_key,
+                                         time_t timestamp);
+
+cJSON* nostr_nip60_create_rollover_token(const nostr_nip60_token_data_t* remaining_proofs,
+                                         const char** deleted_event_ids,
+                                         int deleted_count,
+                                         const unsigned char* private_key,
+                                         time_t timestamp);
+
+cJSON* nostr_nip60_create_history_event(const nostr_nip60_history_data_t* history_data,
+                                        const unsigned char* private_key,
+                                        time_t timestamp);
+
+int nostr_nip60_parse_history_event(cJSON* event,
+                                    const unsigned char* private_key,
+                                    nostr_nip60_history_data_t* history_data_out);
+
+void nostr_nip60_free_history_data(nostr_nip60_history_data_t* data);
+
+cJSON* nostr_nip60_create_quote_event(const char* quote_id,
+                                      const char* mint_url,
+                                      time_t expiration,
+                                      const unsigned char* private_key,
+                                      time_t timestamp);
+
+int nostr_nip60_parse_quote_event(cJSON* event,
+                                  const unsigned char* private_key,
+                                  char* quote_id_out,
+                                  size_t quote_id_size,
+                                  char* mint_url_out,
+                                  size_t mint_url_size,
+                                  time_t* expiration_out);
+
+uint64_t nostr_nip60_sum_proofs(const nostr_cashu_proof_t* proofs, int proof_count);
+
+cJSON* nostr_nip60_proofs_to_json(const nostr_cashu_proof_t* proofs, int proof_count);
+
+int nostr_nip60_proofs_from_json(cJSON* json_array,
+                                 nostr_cashu_proof_t** proofs_out,
+                                 int* proof_count_out);
+
+void nostr_nip60_free_proofs(nostr_cashu_proof_t* proofs, int proof_count);
+
+cJSON* nostr_nip60_create_wallet_filter(const char* pubkey_hex);
+
+cJSON* nostr_nip60_create_history_filter(const char* pubkey_hex, time_t since);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* NOSTR_NIP060_H */
@@ -0,0 +1,540 @@
+/*
+ * NIP-61: Nutzaps Implementation
+ * https://github.com/nostr-protocol/nips/blob/master/61.md
+ */
+
+#include "nip061.h"
+#include "nip060.h"
+#include <stdlib.h>
+#include <string.h>
+#include <stdio.h>
+
+static char* nip61_strdup(const char* s) {
+    if (!s) return NULL;
+    size_t len = strlen(s);
+    char* out = (char*)malloc(len + 1);
+    if (!out) return NULL;
+    memcpy(out, s, len + 1);
+    return out;
+}
+
+static int nip61_mint_in_info(const char* mint_url, const nostr_nip61_nutzap_info_t* info) {
+    if (!mint_url || !info) return 0;
+    for (int i = 0; i < info->mint_count; i++) {
+        if (info->mints[i].url && strcmp(info->mints[i].url, mint_url) == 0) {
+            return 1;
+        }
+    }
+    return 0;
+}
+
+cJSON* nostr_nip61_create_nutzap_info_event(const nostr_nip61_nutzap_info_t* info,
+                                            const unsigned char* private_key,
+                                            time_t timestamp) {
+    if (!info || !private_key || info->mint_count <= 0 || info->relay_count <= 0 || info->pubkey[0] == '\0') {
+        return NULL;
+    }
+
+    cJSON* tags = cJSON_CreateArray();
+    if (!tags) return NULL;
+
+    for (int i = 0; i < info->relay_count; i++) {
+        if (!info->relay_urls || !info->relay_urls[i]) continue;
+        cJSON* relay = cJSON_CreateArray();
+        cJSON_AddItemToArray(relay, cJSON_CreateString("relay"));
+        cJSON_AddItemToArray(relay, cJSON_CreateString(info->relay_urls[i]));
+        cJSON_AddItemToArray(tags, relay);
+    }
+
+    for (int i = 0; i < info->mint_count; i++) {
+        if (!info->mints || !info->mints[i].url) continue;
+        cJSON* mint = cJSON_CreateArray();
+        cJSON_AddItemToArray(mint, cJSON_CreateString("mint"));
+        cJSON_AddItemToArray(mint, cJSON_CreateString(info->mints[i].url));
+        for (int u = 0; u < info->mints[i].unit_count; u++) {
+            if (info->mints[i].units && info->mints[i].units[u]) {
+                cJSON_AddItemToArray(mint, cJSON_CreateString(info->mints[i].units[u]));
+            }
+        }
+        cJSON_AddItemToArray(tags, mint);
+    }
+
+    cJSON* pub = cJSON_CreateArray();
+    cJSON_AddItemToArray(pub, cJSON_CreateString("pubkey"));
+    cJSON_AddItemToArray(pub, cJSON_CreateString(info->pubkey));
+    cJSON_AddItemToArray(tags, pub);
+
+    cJSON* evt = nostr_create_and_sign_event(NOSTR_NIP61_NUTZAP_INFO_KIND, "", tags, private_key, timestamp);
+    cJSON_Delete(tags);
+    return evt;
+}
+
+int nostr_nip61_parse_nutzap_info_event(cJSON* event,
+                                        nostr_nip61_nutzap_info_t* info_out) {
+    if (!event || !info_out) return NOSTR_ERROR_INVALID_INPUT;
+
+    memset(info_out, 0, sizeof(*info_out));
+
+    cJSON* kind_item = cJSON_GetObjectItem(event, "kind");
+    cJSON* tags = cJSON_GetObjectItem(event, "tags");
+    if (!kind_item || !cJSON_IsNumber(kind_item) || (int)cJSON_GetNumberValue(kind_item) != NOSTR_NIP61_NUTZAP_INFO_KIND ||
+        !tags || !cJSON_IsArray(tags)) {
+        return NOSTR_ERROR_NIP61_INVALID_INFO;
+    }
+
+    int relay_count = 0;
+    int mint_count = 0;
+
+    cJSON* tag = NULL;
+    cJSON_ArrayForEach(tag, tags) {
+        if (!cJSON_IsArray(tag) || cJSON_GetArraySize(tag) < 2) continue;
+        cJSON* t0 = cJSON_GetArrayItem(tag, 0);
+        if (!t0 || !cJSON_IsString(t0)) continue;
+        const char* key = cJSON_GetStringValue(t0);
+        if (!key) continue;
+        if (strcmp(key, "relay") == 0) relay_count++;
+        if (strcmp(key, "mint") == 0) mint_count++;
+    }
+
+    if (relay_count > 0) {
+        info_out->relay_urls = (char**)calloc((size_t)relay_count, sizeof(char*));
+        if (!info_out->relay_urls) return NOSTR_ERROR_MEMORY_FAILED;
+    }
+
+    if (mint_count > 0) {
+        info_out->mints = (nostr_nip61_mint_entry_t*)calloc((size_t)mint_count, sizeof(nostr_nip61_mint_entry_t));
+        if (!info_out->mints) {
+            nostr_nip61_free_nutzap_info(info_out);
+            return NOSTR_ERROR_MEMORY_FAILED;
+        }
+    }
+
+    int relay_idx = 0;
+    int mint_idx = 0;
+
+    cJSON_ArrayForEach(tag, tags) {
+        if (!cJSON_IsArray(tag) || cJSON_GetArraySize(tag) < 2) continue;
+        cJSON* t0 = cJSON_GetArrayItem(tag, 0);
+        cJSON* t1 = cJSON_GetArrayItem(tag, 1);
+        if (!t0 || !t1 || !cJSON_IsString(t0) || !cJSON_IsString(t1)) continue;
+
+        const char* key = cJSON_GetStringValue(t0);
+        const char* val = cJSON_GetStringValue(t1);
+        if (!key || !val) continue;
+
+        if (strcmp(key, "relay") == 0 && relay_idx < relay_count) {
+            info_out->relay_urls[relay_idx] = nip61_strdup(val);
+            if (!info_out->relay_urls[relay_idx]) {
+                nostr_nip61_free_nutzap_info(info_out);
+                return NOSTR_ERROR_MEMORY_FAILED;
+            }
+            relay_idx++;
+        } else if (strcmp(key, "mint") == 0 && mint_idx < mint_count) {
+            info_out->mints[mint_idx].url = nip61_strdup(val);
+            if (!info_out->mints[mint_idx].url) {
+                nostr_nip61_free_nutzap_info(info_out);
+                return NOSTR_ERROR_MEMORY_FAILED;
+            }
+
+            int total = cJSON_GetArraySize(tag);
+            int unit_count = (total > 2) ? (total - 2) : 0;
+            if (unit_count > 0) {
+                info_out->mints[mint_idx].units = (char**)calloc((size_t)unit_count, sizeof(char*));
+                if (!info_out->mints[mint_idx].units) {
+                    nostr_nip61_free_nutzap_info(info_out);
+                    return NOSTR_ERROR_MEMORY_FAILED;
+                }
+
+                for (int u = 0; u < unit_count; u++) {
+                    cJSON* unit_item = cJSON_GetArrayItem(tag, u + 2);
+                    if (unit_item && cJSON_IsString(unit_item)) {
+                        const char* us = cJSON_GetStringValue(unit_item);
+                        if (us) {
+                            info_out->mints[mint_idx].units[info_out->mints[mint_idx].unit_count] = nip61_strdup(us);
+                            if (!info_out->mints[mint_idx].units[info_out->mints[mint_idx].unit_count]) {
+                                nostr_nip61_free_nutzap_info(info_out);
+                                return NOSTR_ERROR_MEMORY_FAILED;
+                            }
+                            info_out->mints[mint_idx].unit_count++;
+                        }
+                    }
+                }
+            }
+            mint_idx++;
+        } else if (strcmp(key, "pubkey") == 0) {
+            strncpy(info_out->pubkey, val, sizeof(info_out->pubkey) - 1);
+            info_out->pubkey[sizeof(info_out->pubkey) - 1] = '\0';
+        }
+    }
+
+    info_out->relay_count = relay_idx;
+    info_out->mint_count = mint_idx;
+
+    if (info_out->pubkey[0] == '\0' || info_out->mint_count == 0) {
+        nostr_nip61_free_nutzap_info(info_out);
+        return NOSTR_ERROR_NIP61_INVALID_INFO;
+    }
+
+    return NOSTR_SUCCESS;
+}
+
+void nostr_nip61_free_nutzap_info(nostr_nip61_nutzap_info_t* info) {
+    if (!info) return;
+
+    if (info->relay_urls) {
+        for (int i = 0; i < info->relay_count; i++) {
+            free(info->relay_urls[i]);
+        }
+        free(info->relay_urls);
+    }
+
+    if (info->mints) {
+        for (int i = 0; i < info->mint_count; i++) {
+            free(info->mints[i].url);
+            if (info->mints[i].units) {
+                for (int u = 0; u < info->mints[i].unit_count; u++) {
+                    free(info->mints[i].units[u]);
+                }
+                free(info->mints[i].units);
+            }
+        }
+        free(info->mints);
+    }
+
+    memset(info, 0, sizeof(*info));
+}
+
+cJSON* nostr_nip61_create_nutzap_event(const nostr_nip61_nutzap_data_t* nutzap_data,
+                                       const unsigned char* sender_private_key,
+                                       time_t timestamp) {
+    if (!nutzap_data || !sender_private_key || !nutzap_data->mint_url ||
+        !nutzap_data->proofs || nutzap_data->proof_count <= 0 ||
+        nutzap_data->recipient_pubkey[0] == '\0') {
+        return NULL;
+    }
+
+    cJSON* tags = cJSON_CreateArray();
+    if (!tags) return NULL;
+
+    for (int i = 0; i < nutzap_data->proof_count; i++) {
+        cJSON* proof_json = cJSON_CreateObject();
+        cJSON_AddStringToObject(proof_json, "id", nutzap_data->proofs[i].id);
+        cJSON_AddNumberToObject(proof_json, "amount", (double)nutzap_data->proofs[i].amount);
+        cJSON_AddStringToObject(proof_json, "secret", nutzap_data->proofs[i].secret ? nutzap_data->proofs[i].secret : "");
+        cJSON_AddStringToObject(proof_json, "C", nutzap_data->proofs[i].C ? nutzap_data->proofs[i].C : "");
+
+        char* proof_str = cJSON_PrintUnformatted(proof_json);
+        cJSON_Delete(proof_json);
+        if (!proof_str) {
+            cJSON_Delete(tags);
+            return NULL;
+        }
+
+        cJSON* proof_tag = cJSON_CreateArray();
+        cJSON_AddItemToArray(proof_tag, cJSON_CreateString("proof"));
+        cJSON_AddItemToArray(proof_tag, cJSON_CreateString(proof_str));
+        cJSON_AddItemToArray(tags, proof_tag);
+        free(proof_str);
+    }
+
+    cJSON* u = cJSON_CreateArray();
+    cJSON_AddItemToArray(u, cJSON_CreateString("u"));
+    cJSON_AddItemToArray(u, cJSON_CreateString(nutzap_data->mint_url));
+    cJSON_AddItemToArray(tags, u);
+
+    cJSON* p = cJSON_CreateArray();
+    cJSON_AddItemToArray(p, cJSON_CreateString("p"));
+    cJSON_AddItemToArray(p, cJSON_CreateString(nutzap_data->recipient_pubkey));
+    cJSON_AddItemToArray(tags, p);
+
+    if (nutzap_data->nutzapped_event_id[0] != '\0') {
+        cJSON* e = cJSON_CreateArray();
+        cJSON_AddItemToArray(e, cJSON_CreateString("e"));
+        cJSON_AddItemToArray(e, cJSON_CreateString(nutzap_data->nutzapped_event_id));
+        cJSON_AddItemToArray(e, cJSON_CreateString(nutzap_data->nutzapped_relay_hint));
+        cJSON_AddItemToArray(tags, e);
+
+        if (nutzap_data->nutzapped_kind > 0) {
+            cJSON* k = cJSON_CreateArray();
+            char kind_buf[16];
+            snprintf(kind_buf, sizeof(kind_buf), "%d", nutzap_data->nutzapped_kind);
+            cJSON_AddItemToArray(k, cJSON_CreateString("k"));
+            cJSON_AddItemToArray(k, cJSON_CreateString(kind_buf));
+            cJSON_AddItemToArray(tags, k);
+        }
+    }
+
+    const char* content = nutzap_data->content ? nutzap_data->content : "";
+    cJSON* evt = nostr_create_and_sign_event(NOSTR_NIP61_NUTZAP_KIND, content, tags, sender_private_key, timestamp);
+    cJSON_Delete(tags);
+    return evt;
+}
+
+int nostr_nip61_parse_nutzap_event(cJSON* event,
+                                   nostr_nip61_nutzap_data_t* nutzap_data_out) {
+    if (!event || !nutzap_data_out) return NOSTR_ERROR_INVALID_INPUT;
+
+    memset(nutzap_data_out, 0, sizeof(*nutzap_data_out));
+
+    cJSON* kind_item = cJSON_GetObjectItem(event, "kind");
+    cJSON* tags = cJSON_GetObjectItem(event, "tags");
+    cJSON* content = cJSON_GetObjectItem(event, "content");
+
+    if (!kind_item || !cJSON_IsNumber(kind_item) || (int)cJSON_GetNumberValue(kind_item) != NOSTR_NIP61_NUTZAP_KIND ||
+        !tags || !cJSON_IsArray(tags) || !content || !cJSON_IsString(content)) {
+        return NOSTR_ERROR_NIP61_INVALID_NUTZAP;
+    }
+
+    const char* content_str = cJSON_GetStringValue(content);
+    nutzap_data_out->content = nip61_strdup(content_str ? content_str : "");
+    if (!nutzap_data_out->content) return NOSTR_ERROR_MEMORY_FAILED;
+
+    int proof_count = 0;
+    cJSON* tag = NULL;
+    cJSON_ArrayForEach(tag, tags) {
+        if (!cJSON_IsArray(tag) || cJSON_GetArraySize(tag) < 2) continue;
+        cJSON* t0 = cJSON_GetArrayItem(tag, 0);
+        if (t0 && cJSON_IsString(t0) && strcmp(cJSON_GetStringValue(t0), "proof") == 0) {
+            proof_count++;
+        }
+    }
+
+    if (proof_count > 0) {
+        nutzap_data_out->proofs = (nostr_cashu_proof_t*)calloc((size_t)proof_count, sizeof(nostr_cashu_proof_t));
+        if (!nutzap_data_out->proofs) {
+            nostr_nip61_free_nutzap_data(nutzap_data_out);
+            return NOSTR_ERROR_MEMORY_FAILED;
+        }
+    }
+
+    int proof_idx = 0;
+    cJSON_ArrayForEach(tag, tags) {
+        if (!cJSON_IsArray(tag) || cJSON_GetArraySize(tag) < 2) continue;
+        cJSON* t0 = cJSON_GetArrayItem(tag, 0);
+        cJSON* t1 = cJSON_GetArrayItem(tag, 1);
+        if (!t0 || !t1 || !cJSON_IsString(t0) || !cJSON_IsString(t1)) continue;
+
+        const char* key = cJSON_GetStringValue(t0);
+        const char* val = cJSON_GetStringValue(t1);
+        if (!key || !val) continue;
+
+        if (strcmp(key, "proof") == 0 && proof_idx < proof_count) {
+            cJSON* proof_obj = cJSON_Parse(val);
+            if (!proof_obj || !cJSON_IsObject(proof_obj)) {
+                cJSON_Delete(proof_obj);
+                continue;
+            }
+
+            cJSON* id = cJSON_GetObjectItem(proof_obj, "id");
+            cJSON* amount = cJSON_GetObjectItem(proof_obj, "amount");
+            cJSON* secret = cJSON_GetObjectItem(proof_obj, "secret");
+            cJSON* C = cJSON_GetObjectItem(proof_obj, "C");
+
+            if (id && cJSON_IsString(id) && amount && cJSON_IsNumber(amount) &&
+                secret && cJSON_IsString(secret) && C && cJSON_IsString(C)) {
+                const char* id_s = cJSON_GetStringValue(id);
+                const char* sec_s = cJSON_GetStringValue(secret);
+                const char* c_s = cJSON_GetStringValue(C);
+
+                if (id_s && sec_s && c_s) {
+                    strncpy(nutzap_data_out->proofs[proof_idx].id, id_s,
+                            sizeof(nutzap_data_out->proofs[proof_idx].id) - 1);
+                    nutzap_data_out->proofs[proof_idx].amount = (uint64_t)cJSON_GetNumberValue(amount);
+                    nutzap_data_out->proofs[proof_idx].secret = nip61_strdup(sec_s);
+                    nutzap_data_out->proofs[proof_idx].C = nip61_strdup(c_s);
+                    if (!nutzap_data_out->proofs[proof_idx].secret || !nutzap_data_out->proofs[proof_idx].C) {
+                        cJSON_Delete(proof_obj);
+                        nostr_nip61_free_nutzap_data(nutzap_data_out);
+                        return NOSTR_ERROR_MEMORY_FAILED;
+                    }
+                    proof_idx++;
+                }
+            }
+
+            cJSON_Delete(proof_obj);
+        } else if (strcmp(key, "u") == 0) {
+            free(nutzap_data_out->mint_url);
+            nutzap_data_out->mint_url = nip61_strdup(val);
+            if (!nutzap_data_out->mint_url) {
+                nostr_nip61_free_nutzap_data(nutzap_data_out);
+                return NOSTR_ERROR_MEMORY_FAILED;
+            }
+        } else if (strcmp(key, "p") == 0) {
+            strncpy(nutzap_data_out->recipient_pubkey, val, sizeof(nutzap_data_out->recipient_pubkey) - 1);
+        } else if (strcmp(key, "e") == 0) {
+            strncpy(nutzap_data_out->nutzapped_event_id, val, sizeof(nutzap_data_out->nutzapped_event_id) - 1);
+            cJSON* t2 = cJSON_GetArrayItem(tag, 2);
+            if (t2 && cJSON_IsString(t2)) {
+                const char* relay = cJSON_GetStringValue(t2);
+                if (relay) strncpy(nutzap_data_out->nutzapped_relay_hint, relay,
+                                   sizeof(nutzap_data_out->nutzapped_relay_hint) - 1);
+            }
+        } else if (strcmp(key, "k") == 0) {
+            nutzap_data_out->nutzapped_kind = atoi(val);
+        }
+    }
+
+    nutzap_data_out->proof_count = proof_idx;
+
+    if (!nutzap_data_out->mint_url || nutzap_data_out->recipient_pubkey[0] == '\0' || proof_idx == 0) {
+        nostr_nip61_free_nutzap_data(nutzap_data_out);
+        return NOSTR_ERROR_NIP61_INVALID_NUTZAP;
+    }
+
+    return NOSTR_SUCCESS;
+}
+
+void nostr_nip61_free_nutzap_data(nostr_nip61_nutzap_data_t* data) {
+    if (!data) return;
+    free(data->content);
+    free(data->mint_url);
+    nostr_nip60_free_proofs(data->proofs, data->proof_count);
+    memset(data, 0, sizeof(*data));
+}
+
+cJSON* nostr_nip61_create_redemption_event(const char* nutzap_event_id,
+                                           const char* nutzap_relay_hint,
+                                           const char* sender_pubkey,
+                                           const char* created_token_event_id,
+                                           const char* created_token_relay_hint,
+                                           uint64_t amount,
+                                           const unsigned char* private_key,
+                                           time_t timestamp) {
+    if (!nutzap_event_id || !sender_pubkey || !created_token_event_id || !private_key) {
+        return NULL;
+    }
+
+    nostr_nip60_history_ref_t refs[1];
+    memset(refs, 0, sizeof(refs));
+    strncpy(refs[0].event_id, created_token_event_id, sizeof(refs[0].event_id) - 1);
+    if (created_token_relay_hint) {
+        strncpy(refs[0].relay_hint, created_token_relay_hint, sizeof(refs[0].relay_hint) - 1);
+    }
+    refs[0].marker = NOSTR_NIP60_REF_CREATED;
+
+    nostr_nip60_history_data_t hist;
+    memset(&hist, 0, sizeof(hist));
+    hist.direction = NOSTR_NIP60_DIRECTION_IN;
+    hist.amount = amount;
+    hist.refs = refs;
+    hist.ref_count = 1;
+
+    cJSON* evt = nostr_nip60_create_history_event(&hist, private_key, timestamp);
+    if (!evt) return NULL;
+
+    cJSON* tags = cJSON_GetObjectItem(evt, "tags");
+    if (!tags || !cJSON_IsArray(tags)) return evt;
+
+    cJSON* e = cJSON_CreateArray();
+    cJSON_AddItemToArray(e, cJSON_CreateString("e"));
+    cJSON_AddItemToArray(e, cJSON_CreateString(nutzap_event_id));
+    cJSON_AddItemToArray(e, cJSON_CreateString(nutzap_relay_hint ? nutzap_relay_hint : ""));
+    cJSON_AddItemToArray(e, cJSON_CreateString("redeemed"));
+    cJSON_AddItemToArray(tags, e);
+
+    cJSON* p = cJSON_CreateArray();
+    cJSON_AddItemToArray(p, cJSON_CreateString("p"));
+    cJSON_AddItemToArray(p, cJSON_CreateString(sender_pubkey));
+    cJSON_AddItemToArray(tags, p);
+
+    return evt;
+}
+
+int nostr_nip61_verify_nutzap(cJSON* nutzap_event, cJSON* nutzap_info_event) {
+    if (!nutzap_event || !nutzap_info_event) return NOSTR_ERROR_INVALID_INPUT;
+
+    nostr_nip61_nutzap_data_t nutzap;
+    memset(&nutzap, 0, sizeof(nutzap));
+    int rc = nostr_nip61_parse_nutzap_event(nutzap_event, &nutzap);
+    if (rc != NOSTR_SUCCESS) return rc;
+
+    nostr_nip61_nutzap_info_t info;
+    memset(&info, 0, sizeof(info));
+    rc = nostr_nip61_parse_nutzap_info_event(nutzap_info_event, &info);
+    if (rc != NOSTR_SUCCESS) {
+        nostr_nip61_free_nutzap_data(&nutzap);
+        return rc;
+    }
+
+    if (!nip61_mint_in_info(nutzap.mint_url, &info)) {
+        nostr_nip61_free_nutzap_data(&nutzap);
+        nostr_nip61_free_nutzap_info(&info);
+        return NOSTR_ERROR_NIP61_MINT_MISMATCH;
+    }
+
+    int key_match = 0;
+    if (strlen(info.pubkey) == 64) {
+        for (int i = 0; i < nutzap.proof_count; i++) {
+            if (nutzap.proofs[i].secret && strstr(nutzap.proofs[i].secret, info.pubkey) != NULL) {
+                key_match = 1;
+                break;
+            }
+        }
+    } else if (strlen(info.pubkey) == 66 && strncmp(info.pubkey, "02", 2) == 0) {
+        const char* xonly = info.pubkey + 2;
+        for (int i = 0; i < nutzap.proof_count; i++) {
+            if (nutzap.proofs[i].secret && strstr(nutzap.proofs[i].secret, xonly) != NULL) {
+                key_match = 1;
+                break;
+            }
+        }
+    }
+
+    nostr_nip61_free_nutzap_data(&nutzap);
+    nostr_nip61_free_nutzap_info(&info);
+
+    if (!key_match) {
+        return NOSTR_ERROR_NIP61_PUBKEY_MISMATCH;
+    }
+
+    return NOSTR_SUCCESS;
+}
+
+cJSON* nostr_nip61_create_nutzap_info_filter(const char* pubkey_hex) {
+    if (!pubkey_hex) return NULL;
+
+    cJSON* filter = cJSON_CreateObject();
+    if (!filter) return NULL;
+
+    cJSON* kinds = cJSON_CreateArray();
+    cJSON_AddItemToArray(kinds, cJSON_CreateNumber(NOSTR_NIP61_NUTZAP_INFO_KIND));
+    cJSON_AddItemToObject(filter, "kinds", kinds);
+
+    cJSON* authors = cJSON_CreateArray();
+    cJSON_AddItemToArray(authors, cJSON_CreateString(pubkey_hex));
+    cJSON_AddItemToObject(filter, "authors", authors);
+
+    return filter;
+}
+
+cJSON* nostr_nip61_create_nutzap_filter(const char* recipient_pubkey_hex,
+                                        const char** mint_urls,
+                                        int mint_count,
+                                        time_t since) {
+    if (!recipient_pubkey_hex) return NULL;
+
+    cJSON* filter = cJSON_CreateObject();
+    if (!filter) return NULL;
+
+    cJSON* kinds = cJSON_CreateArray();
+    cJSON_AddItemToArray(kinds, cJSON_CreateNumber(NOSTR_NIP61_NUTZAP_KIND));
+    cJSON_AddItemToObject(filter, "kinds", kinds);
+
+    cJSON* pvals = cJSON_CreateArray();
+    cJSON_AddItemToArray(pvals, cJSON_CreateString(recipient_pubkey_hex));
+    cJSON_AddItemToObject(filter, "#p", pvals);
+
+    if (mint_urls && mint_count > 0) {
+        cJSON* uvals = cJSON_CreateArray();
+        for (int i = 0; i < mint_count; i++) {
+            if (mint_urls[i]) cJSON_AddItemToArray(uvals, cJSON_CreateString(mint_urls[i]));
+        }
+        cJSON_AddItemToObject(filter, "#u", uvals);
+    }
+
+    if (since > 0) {
+        cJSON_AddNumberToObject(filter, "since", (double)since);
+    }
+
+    return filter;
+}
@@ -0,0 +1,89 @@
+/*
+ * NIP-61: Nutzaps
+ * https://github.com/nostr-protocol/nips/blob/master/61.md
+ */
+
+#ifndef NOSTR_NIP061_H
+#define NOSTR_NIP061_H
+
+#include <stddef.h>
+#include <stdint.h>
+#include <time.h>
+#include "nip001.h"
+#include "nip060.h"
+#include "nostr_common.h"
+#include "../cjson/cJSON.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#define NOSTR_NIP61_NUTZAP_INFO_KIND 10019
+#define NOSTR_NIP61_NUTZAP_KIND 9321
+
+typedef struct {
+    char* url;
+    char** units;
+    int unit_count;
+} nostr_nip61_mint_entry_t;
+
+typedef struct {
+    char** relay_urls;
+    int relay_count;
+    nostr_nip61_mint_entry_t* mints;
+    int mint_count;
+    char pubkey[NOSTR_CASHU_PUBKEY_HEX_SIZE];
+} nostr_nip61_nutzap_info_t;
+
+typedef struct {
+    char* content;
+    nostr_cashu_proof_t* proofs;
+    int proof_count;
+    char* mint_url;
+    char recipient_pubkey[65];
+    char nutzapped_event_id[NOSTR_CASHU_EVENT_ID_HEX_SIZE];
+    char nutzapped_relay_hint[256];
+    int nutzapped_kind;
+} nostr_nip61_nutzap_data_t;
+
+cJSON* nostr_nip61_create_nutzap_info_event(const nostr_nip61_nutzap_info_t* info,
+                                            const unsigned char* private_key,
+                                            time_t timestamp);
+
+int nostr_nip61_parse_nutzap_info_event(cJSON* event,
+                                        nostr_nip61_nutzap_info_t* info_out);
+
+void nostr_nip61_free_nutzap_info(nostr_nip61_nutzap_info_t* info);
+
+cJSON* nostr_nip61_create_nutzap_event(const nostr_nip61_nutzap_data_t* nutzap_data,
+                                       const unsigned char* sender_private_key,
+                                       time_t timestamp);
+
+int nostr_nip61_parse_nutzap_event(cJSON* event,
+                                   nostr_nip61_nutzap_data_t* nutzap_data_out);
+
+void nostr_nip61_free_nutzap_data(nostr_nip61_nutzap_data_t* data);
+
+cJSON* nostr_nip61_create_redemption_event(const char* nutzap_event_id,
+                                           const char* nutzap_relay_hint,
+                                           const char* sender_pubkey,
+                                           const char* created_token_event_id,
+                                           const char* created_token_relay_hint,
+                                           uint64_t amount,
+                                           const unsigned char* private_key,
+                                           time_t timestamp);
+
+int nostr_nip61_verify_nutzap(cJSON* nutzap_event, cJSON* nutzap_info_event);
+
+cJSON* nostr_nip61_create_nutzap_info_filter(const char* pubkey_hex);
+
+cJSON* nostr_nip61_create_nutzap_filter(const char* recipient_pubkey_hex,
+                                        const char** mint_urls,
+                                        int mint_count,
+                                        time_t since);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* NOSTR_NIP061_H */
@@ -1,53 +0,0 @@
-#ifndef _NOSTR_AES_H_
-#define _NOSTR_AES_H_
-
-#include <stdint.h>
-#include <stddef.h>
-
-// Configure for NIP-04 requirements: AES-256-CBC only
-#define CBC 1
-#define ECB 0
-#define CTR 0
-
-// Configure for AES-256 (required by NIP-04)
-#define AES128 0
-#define AES192 0
-#define AES256 1
-
-#define AES_BLOCKLEN 16 // Block length in bytes - AES is 128b block only
-
-#if defined(AES256) && (AES256 == 1)
-    #define AES_KEYLEN 32
-    #define AES_keyExpSize 240
-#elif defined(AES192) && (AES192 == 1)
-    #define AES_KEYLEN 24
-    #define AES_keyExpSize 208
-#else
-    #define AES_KEYLEN 16   // Key length in bytes
-    #define AES_keyExpSize 176
-#endif
-
-struct AES_ctx
-{
-  uint8_t RoundKey[AES_keyExpSize];
-#if (defined(CBC) && (CBC == 1)) || (defined(CTR) && (CTR == 1))
-  uint8_t Iv[AES_BLOCKLEN];
-#endif
-};
-
-void AES_init_ctx(struct AES_ctx* ctx, const uint8_t* key);
-#if (defined(CBC) && (CBC == 1)) || (defined(CTR) && (CTR == 1))
-void AES_init_ctx_iv(struct AES_ctx* ctx, const uint8_t* key, const uint8_t* iv);
-void AES_ctx_set_iv(struct AES_ctx* ctx, const uint8_t* iv);
-#endif
-
-#if defined(CBC) && (CBC == 1)
-// buffer size MUST be multiple of AES_BLOCKLEN;
-// Suggest https://en.wikipedia.org/wiki/Padding_(cryptography)#PKCS7 for padding scheme
-// NOTES: you need to set IV in ctx via AES_init_ctx_iv() or AES_ctx_set_iv()
-//        no IV should ever be reused with the same key 
-void AES_CBC_encrypt_buffer(struct AES_ctx* ctx, uint8_t* buf, size_t length);
-void AES_CBC_decrypt_buffer(struct AES_ctx* ctx, uint8_t* buf, size_t length);
-#endif // #if defined(CBC) && (CBC == 1)
-
-#endif // _NOSTR_AES_H_
@@ -1,115 +0,0 @@
-/*
- * nostr_chacha20.h - ChaCha20 stream cipher implementation
- * 
- * Implementation based on RFC 8439 "ChaCha20 and Poly1305 for IETF Protocols"
- * 
- * This is a small, portable implementation for NIP-44 support in the NOSTR library.
- * The implementation prioritizes correctness and simplicity over performance.
- */
-
-#ifndef NOSTR_CHACHA20_H
-#define NOSTR_CHACHA20_H
-
-#include <stdint.h>
-#include <stddef.h>
-
-#ifdef __cplusplus
-extern "C" {
-#endif
-
-/*
- * ============================================================================
- * CONSTANTS AND DEFINITIONS
- * ============================================================================
- */
-
-#define CHACHA20_KEY_SIZE    32  /* 256 bits */
-#define CHACHA20_NONCE_SIZE  12  /* 96 bits */
-#define CHACHA20_BLOCK_SIZE  64  /* 512 bits */
-
-/*
- * ============================================================================
- * CORE CHACHA20 FUNCTIONS
- * ============================================================================
- */
-
-/**
- * ChaCha20 quarter round operation
- * 
- * Operates on four 32-bit words performing the core ChaCha20 quarter round:
- * a += b; d ^= a; d <<<= 16;
- * c += d; b ^= c; b <<<= 12;
- * a += b; d ^= a; d <<<= 8;
- * c += d; b ^= c; b <<<= 7;
- * 
- * @param state[in,out] ChaCha state as 16 32-bit words
- * @param a, b, c, d    Indices into state array for quarter round
- */
-void chacha20_quarter_round(uint32_t state[16], int a, int b, int c, int d);
-
-/**
- * ChaCha20 block function
- * 
- * Transforms a 64-byte input block using ChaCha20 algorithm with 20 rounds.
- * 
- * @param key[in]       32-byte key
- * @param counter[in]   32-bit block counter
- * @param nonce[in]     12-byte nonce
- * @param output[out]   64-byte output buffer
- * @return              0 on success, negative on error
- */
-int chacha20_block(const uint8_t key[32], uint32_t counter, 
-                   const uint8_t nonce[12], uint8_t output[64]);
-
-/**
- * ChaCha20 encryption/decryption
- * 
- * Encrypts or decrypts data using ChaCha20 stream cipher.
- * Since ChaCha20 is a stream cipher, encryption and decryption are the same operation.
- * 
- * @param key[in]           32-byte key
- * @param counter[in]       Initial 32-bit counter value
- * @param nonce[in]         12-byte nonce
- * @param input[in]         Input data to encrypt/decrypt
- * @param output[out]       Output buffer (can be same as input)
- * @param length[in]        Length of input data in bytes
- * @return                  0 on success, negative on error
- */
-int chacha20_encrypt(const uint8_t key[32], uint32_t counter, 
-                     const uint8_t nonce[12], const uint8_t* input, 
-                     uint8_t* output, size_t length);
-
-/*
- * ============================================================================
- * UTILITY FUNCTIONS
- * ============================================================================
- */
-
-/**
- * Initialize ChaCha20 state matrix
- * 
- * Sets up the initial 16-word state matrix with constants, key, counter, and nonce.
- * 
- * @param state[out]    16-word state array to initialize
- * @param key[in]       32-byte key
- * @param counter[in]   32-bit block counter
- * @param nonce[in]     12-byte nonce
- */
-void chacha20_init_state(uint32_t state[16], const uint8_t key[32], 
-                         uint32_t counter, const uint8_t nonce[12]);
-
-/**
- * Serialize ChaCha20 state to bytes
- * 
- * Converts 16 32-bit words to 64 bytes in little-endian format.
- * 
- * @param state[in]     16-word state array
- * @param output[out]   64-byte output buffer
- */
-void chacha20_serialize_state(const uint32_t state[16], uint8_t output[64]);
-
-#ifdef __cplusplus
-}
-#endif
-
-#endif /* NOSTR_CHACHA20_H */
@@ -0,0 +1,106 @@
+/*
+ * NOSTR Core Library - Common Utilities
+ * 
+ * Common functions and utilities shared across the library
+ */
+
+#include "nostr_common.h"
+#include "utils.h"
+
+/**
+ * Convert error code to human-readable string
+ * Handles all error codes defined in nostr_common.h
+ */
+const char* nostr_strerror(int error_code) {
+    switch (error_code) {
+        case NOSTR_SUCCESS: return "Success";
+        case NOSTR_ERROR_INVALID_INPUT: return "Invalid input";
+        case NOSTR_ERROR_CRYPTO_FAILED: return "Cryptographic operation failed";
+        case NOSTR_ERROR_MEMORY_FAILED: return "Memory allocation failed";
+        case NOSTR_ERROR_IO_FAILED: return "I/O operation failed";
+        case NOSTR_ERROR_NETWORK_FAILED: return "Network operation failed";
+        case NOSTR_ERROR_NIP04_INVALID_FORMAT: return "NIP-04 invalid format";
+        case NOSTR_ERROR_NIP04_DECRYPT_FAILED: return "NIP-04 decryption failed";
+        case NOSTR_ERROR_NIP04_BUFFER_TOO_SMALL: return "NIP-04 buffer too small";
+        case NOSTR_ERROR_NIP44_INVALID_FORMAT: return "NIP-44: Invalid format";
+        case NOSTR_ERROR_NIP44_DECRYPT_FAILED: return "NIP-44: Decryption failed";
+        case NOSTR_ERROR_NIP44_BUFFER_TOO_SMALL: return "NIP-44: Buffer too small";
+        case NOSTR_ERROR_NIP05_INVALID_IDENTIFIER: return "NIP-05: Invalid identifier format";
+        case NOSTR_ERROR_NIP05_HTTP_FAILED: return "NIP-05: HTTP request failed";
+        case NOSTR_ERROR_NIP05_JSON_PARSE_FAILED: return "NIP-05: JSON parsing failed";
+        case NOSTR_ERROR_NIP05_NAME_NOT_FOUND: return "NIP-05: Name not found in .well-known";
+        case NOSTR_ERROR_NIP05_PUBKEY_MISMATCH: return "NIP-05: Public key mismatch";
+        case NOSTR_ERROR_EVENT_INVALID_STRUCTURE: return "Event has invalid structure";
+        case NOSTR_ERROR_EVENT_INVALID_ID: return "Event has invalid ID";
+        case NOSTR_ERROR_EVENT_INVALID_PUBKEY: return "Event has invalid public key";
+        case NOSTR_ERROR_EVENT_INVALID_SIGNATURE: return "Event has invalid signature";
+        case NOSTR_ERROR_EVENT_INVALID_CREATED_AT: return "Event has invalid timestamp";
+        case NOSTR_ERROR_EVENT_INVALID_KIND: return "Event has invalid kind";
+        case NOSTR_ERROR_EVENT_INVALID_TAGS: return "Event has invalid tags";
+        case NOSTR_ERROR_EVENT_INVALID_CONTENT: return "Event has invalid content";
+        case NOSTR_ERROR_NIP13_INSUFFICIENT: return "NIP-13: Insufficient PoW difficulty";
+        case NOSTR_ERROR_NIP13_NO_NONCE_TAG: return "NIP-13: Missing nonce tag";
+        case NOSTR_ERROR_NIP13_INVALID_NONCE_TAG: return "NIP-13: Invalid nonce tag format";
+        case NOSTR_ERROR_NIP13_TARGET_MISMATCH: return "NIP-13: Target difficulty mismatch";
+        case NOSTR_ERROR_NIP13_CALCULATION: return "NIP-13: PoW calculation error";
+        case NOSTR_ERROR_NIP42_INVALID_CHALLENGE: return "NIP-42: Invalid challenge";
+        case NOSTR_ERROR_NIP42_CHALLENGE_EXPIRED: return "NIP-42: Challenge expired";
+        case NOSTR_ERROR_NIP42_AUTH_EVENT_INVALID: return "NIP-42: Authentication event invalid";
+        case NOSTR_ERROR_NIP42_URL_MISMATCH: return "NIP-42: Relay URL mismatch";
+        case NOSTR_ERROR_NIP42_TIME_TOLERANCE: return "NIP-42: Timestamp outside tolerance";
+        case NOSTR_ERROR_NIP42_NOT_AUTHENTICATED: return "NIP-42: Client not authenticated";
+        case NOSTR_ERROR_NIP42_INVALID_MESSAGE_FORMAT: return "NIP-42: Invalid message format";
+        case NOSTR_ERROR_NIP42_CHALLENGE_TOO_SHORT: return "NIP-42: Challenge too short";
+        case NOSTR_ERROR_NIP42_CHALLENGE_TOO_LONG: return "NIP-42: Challenge too long";
+        case NOSTR_ERROR_NIP46_INVALID_BUNKER_URL: return "NIP-46: Invalid bunker URL";
+        case NOSTR_ERROR_NIP46_INVALID_NOSTRCONNECT: return "NIP-46: Invalid nostrconnect URL";
+        case NOSTR_ERROR_NIP46_INVALID_REQUEST: return "NIP-46: Invalid request payload";
+        case NOSTR_ERROR_NIP46_INVALID_RESPONSE: return "NIP-46: Invalid response payload";
+        case NOSTR_ERROR_NIP46_ENCRYPTION_FAILED: return "NIP-46: Encryption failed";
+        case NOSTR_ERROR_NIP46_DECRYPTION_FAILED: return "NIP-46: Decryption failed";
+        case NOSTR_ERROR_NIP46_CONNECTION_FAILED: return "NIP-46: Connection failed";
+        case NOSTR_ERROR_NIP46_TIMEOUT: return "NIP-46: Timeout";
+        case NOSTR_ERROR_NIP46_SECRET_MISMATCH: return "NIP-46: Secret mismatch";
+        case NOSTR_ERROR_NIP46_UNKNOWN_METHOD: return "NIP-46: Unknown method";
+        case NOSTR_ERROR_NIP46_AUTH_CHALLENGE: return "NIP-46: Auth challenge required";
+        case NOSTR_ERROR_NIP46_NOT_CONNECTED: return "NIP-46: Not connected";
+        case NOSTR_ERROR_NIP60_INVALID_WALLET: return "NIP-60: Invalid wallet event";
+        case NOSTR_ERROR_NIP60_INVALID_TOKEN: return "NIP-60: Invalid token event";
+        case NOSTR_ERROR_NIP60_INVALID_HISTORY: return "NIP-60: Invalid history event";
+        case NOSTR_ERROR_NIP60_INVALID_QUOTE: return "NIP-60: Invalid quote event";
+        case NOSTR_ERROR_NIP60_DECRYPT_FAILED: return "NIP-60: Decryption failed";
+        case NOSTR_ERROR_NIP60_INVALID_PROOFS: return "NIP-60: Invalid proofs payload";
+        case NOSTR_ERROR_NIP60_INSUFFICIENT_FUNDS: return "NIP-60: Insufficient funds";
+        case NOSTR_ERROR_NIP61_INVALID_INFO: return "NIP-61: Invalid info event";
+        case NOSTR_ERROR_NIP61_INVALID_NUTZAP: return "NIP-61: Invalid nutzap event";
+        case NOSTR_ERROR_NIP61_MINT_MISMATCH: return "NIP-61: Mint mismatch";
+        case NOSTR_ERROR_NIP61_PUBKEY_MISMATCH: return "NIP-61: Pubkey mismatch";
+        case NOSTR_ERROR_NIP61_VERIFICATION_FAILED: return "NIP-61: Verification failed";
+        case NOSTR_ERROR_CASHU_HTTP_FAILED: return "Cashu: HTTP request failed";
+        case NOSTR_ERROR_CASHU_JSON_PARSE_FAILED: return "Cashu: JSON parsing failed";
+        case NOSTR_ERROR_CASHU_MINT_ERROR: return "Cashu: Mint returned an error";
+        case NOSTR_ERROR_CASHU_QUOTE_NOT_PAID: return "Cashu: Quote not paid";
+        case NOSTR_ERROR_CASHU_QUOTE_EXPIRED: return "Cashu: Quote expired";
+        case NOSTR_ERROR_CASHU_PROOFS_SPENT: return "Cashu: One or more proofs are already spent";
+        case NOSTR_ERROR_CASHU_CRYPTO_FAILED: return "Cashu: Cryptographic operation failed";
+        case NOSTR_ERROR_CASHU_INVALID_KEYSET: return "Cashu: Invalid keyset";
+        default: return "Unknown error";
+    }
+}
+
+/**
+ * Initialize the NOSTR library
+ */
+int nostr_init(void) {
+    if (nostr_crypto_init() != 0) {
+        return NOSTR_ERROR_CRYPTO_FAILED;
+    }
+    return NOSTR_SUCCESS;
+}
+
+/**
+ * Cleanup the NOSTR library
+ */
+void nostr_cleanup(void) {
+    nostr_crypto_cleanup();
+}
@@ -0,0 +1,131 @@
+/*
+ * NOSTR Core - Common Definitions
+ * Shared error constants and basic types for the modular NOSTR library
+ */
+
+#ifndef NOSTR_COMMON_H
+#define NOSTR_COMMON_H
+
+#include <stddef.h>
+#include <stdint.h>
+
+// Return codes
+#define NOSTR_SUCCESS 0
+#define NOSTR_ERROR_INVALID_INPUT -1
+#define NOSTR_ERROR_CRYPTO_FAILED -2
+#define NOSTR_ERROR_MEMORY_FAILED -3
+#define NOSTR_ERROR_IO_FAILED -4
+#define NOSTR_ERROR_NETWORK_FAILED -5
+#define NOSTR_ERROR_NIP04_INVALID_FORMAT -10
+#define NOSTR_ERROR_NIP04_DECRYPT_FAILED -11
+#define NOSTR_ERROR_NIP04_BUFFER_TOO_SMALL -12
+#define NOSTR_ERROR_NIP44_INVALID_FORMAT -13
+#define NOSTR_ERROR_NIP44_DECRYPT_FAILED -14
+#define NOSTR_ERROR_NIP44_BUFFER_TOO_SMALL -15
+#define NOSTR_ERROR_NIP05_INVALID_IDENTIFIER -16
+#define NOSTR_ERROR_NIP05_HTTP_FAILED -17
+#define NOSTR_ERROR_NIP05_JSON_PARSE_FAILED -18
+#define NOSTR_ERROR_NIP05_NAME_NOT_FOUND -19
+#define NOSTR_ERROR_NIP05_PUBKEY_MISMATCH -20
+#define NOSTR_ERROR_EVENT_INVALID_STRUCTURE -30
+#define NOSTR_ERROR_EVENT_INVALID_ID -31
+#define NOSTR_ERROR_EVENT_INVALID_PUBKEY -32
+#define NOSTR_ERROR_EVENT_INVALID_SIGNATURE -33
+#define NOSTR_ERROR_EVENT_INVALID_CREATED_AT -34
+#define NOSTR_ERROR_EVENT_INVALID_KIND -35
+#define NOSTR_ERROR_EVENT_INVALID_TAGS -36
+#define NOSTR_ERROR_EVENT_INVALID_CONTENT -37
+
+// Authentication Rules System Error Codes
+#define NOSTR_ERROR_AUTH_RULES_DISABLED -50
+#define NOSTR_ERROR_AUTH_RULES_DENIED -51
+#define NOSTR_ERROR_AUTH_RULES_DB_FAILED -52
+#define NOSTR_ERROR_AUTH_RULES_INVALID_RULE -53
+#define NOSTR_ERROR_AUTH_RULES_CACHE_FAILED -54
+#define NOSTR_ERROR_AUTH_RULES_BACKEND_NOT_FOUND -55
+
+// NIP-13 PoW-specific error codes
+#define NOSTR_ERROR_NIP13_INSUFFICIENT -100
+#define NOSTR_ERROR_NIP13_NO_NONCE_TAG -101
+#define NOSTR_ERROR_NIP13_INVALID_NONCE_TAG -102
+#define NOSTR_ERROR_NIP13_TARGET_MISMATCH -103
+#define NOSTR_ERROR_NIP13_CALCULATION -104
+
+// NIP-42 Authentication-specific error codes
+#define NOSTR_ERROR_NIP42_INVALID_CHALLENGE -200
+#define NOSTR_ERROR_NIP42_CHALLENGE_EXPIRED -201
+#define NOSTR_ERROR_NIP42_AUTH_EVENT_INVALID -202
+#define NOSTR_ERROR_NIP42_URL_MISMATCH -203
+#define NOSTR_ERROR_NIP42_TIME_TOLERANCE -204
+#define NOSTR_ERROR_NIP42_NOT_AUTHENTICATED -205
+#define NOSTR_ERROR_NIP42_INVALID_MESSAGE_FORMAT -206
+#define NOSTR_ERROR_NIP42_CHALLENGE_TOO_SHORT -207
+#define NOSTR_ERROR_NIP42_CHALLENGE_TOO_LONG -208
+
+// NIP-46 Remote Signing error codes
+#define NOSTR_ERROR_NIP46_INVALID_BUNKER_URL -300
+#define NOSTR_ERROR_NIP46_INVALID_NOSTRCONNECT -301
+#define NOSTR_ERROR_NIP46_INVALID_REQUEST -302
+#define NOSTR_ERROR_NIP46_INVALID_RESPONSE -303
+#define NOSTR_ERROR_NIP46_ENCRYPTION_FAILED -304
+#define NOSTR_ERROR_NIP46_DECRYPTION_FAILED -305
+#define NOSTR_ERROR_NIP46_CONNECTION_FAILED -306
+#define NOSTR_ERROR_NIP46_TIMEOUT -307
+#define NOSTR_ERROR_NIP46_SECRET_MISMATCH -308
+#define NOSTR_ERROR_NIP46_UNKNOWN_METHOD -309
+#define NOSTR_ERROR_NIP46_AUTH_CHALLENGE -310
+#define NOSTR_ERROR_NIP46_NOT_CONNECTED -311
+
+// NIP-60 Cashu Wallet error codes
+#define NOSTR_ERROR_NIP60_INVALID_WALLET -400
+#define NOSTR_ERROR_NIP60_INVALID_TOKEN -401
+#define NOSTR_ERROR_NIP60_INVALID_HISTORY -402
+#define NOSTR_ERROR_NIP60_INVALID_QUOTE -403
+#define NOSTR_ERROR_NIP60_DECRYPT_FAILED -404
+#define NOSTR_ERROR_NIP60_INVALID_PROOFS -405
+#define NOSTR_ERROR_NIP60_INSUFFICIENT_FUNDS -406
+
+// NIP-61 Nutzap error codes
+#define NOSTR_ERROR_NIP61_INVALID_INFO -410
+#define NOSTR_ERROR_NIP61_INVALID_NUTZAP -411
+#define NOSTR_ERROR_NIP61_MINT_MISMATCH -412
+#define NOSTR_ERROR_NIP61_PUBKEY_MISMATCH -413
+#define NOSTR_ERROR_NIP61_VERIFICATION_FAILED -414
+
+// Cashu Mint client error codes
+#define NOSTR_ERROR_CASHU_HTTP_FAILED -420
+#define NOSTR_ERROR_CASHU_JSON_PARSE_FAILED -421
+#define NOSTR_ERROR_CASHU_MINT_ERROR -422
+#define NOSTR_ERROR_CASHU_QUOTE_NOT_PAID -423
+#define NOSTR_ERROR_CASHU_QUOTE_EXPIRED -424
+#define NOSTR_ERROR_CASHU_PROOFS_SPENT -425
+#define NOSTR_ERROR_CASHU_CRYPTO_FAILED -426
+#define NOSTR_ERROR_CASHU_INVALID_KEYSET -427
+
+// Constants
+#define NOSTR_PRIVATE_KEY_SIZE 32
+#define NOSTR_PUBLIC_KEY_SIZE 32
+#define NOSTR_HEX_KEY_SIZE 65  // 64 + null terminator
+#define NOSTR_BECH32_KEY_SIZE 100
+#define NOSTR_MAX_CONTENT_SIZE 2048
+#define NOSTR_MAX_URL_SIZE 256
+#define NIP05_DEFAULT_TIMEOUT 10
+
+// NIP-04 Constants
+#define NOSTR_NIP04_MAX_PLAINTEXT_SIZE 1048576    // 1MB
+#define NOSTR_NIP04_MAX_ENCRYPTED_SIZE 22369621    // ~21.3MB (accounts for base64 overhead + IV)
+
+// NIP-44 Constants
+#define NOSTR_NIP44_MAX_PLAINTEXT_SIZE 65535         // 64KB - 1 (NIP-44 spec compliant)
+
+// Forward declaration for cJSON (to avoid requiring cJSON.h in header)
+struct cJSON;
+
+// Function declarations
+const char* nostr_strerror(int error_code);
+
+// Library initialization functions
+int nostr_init(void);
+void nostr_cleanup(void);
+
+#endif // NOSTR_COMMON_H
@@ -1,186 +0,0 @@
-/*
- * NOSTR Crypto - Self-contained cryptographic functions
- * 
- * Embedded implementations of crypto primitives needed for NOSTR
- * No external dependencies except standard C library
- */
-
-#ifndef NOSTR_CRYPTO_H
-#define NOSTR_CRYPTO_H
-
-#include <stdint.h>
-#include <stddef.h>
-
-#ifdef __cplusplus
-extern "C" {
-#endif
-
-// =============================================================================
-// CORE CRYPTO FUNCTIONS
-// =============================================================================
-
-// Initialize crypto subsystem
-int nostr_crypto_init(void);
-
-// Cleanup crypto subsystem
-void nostr_crypto_cleanup(void);
-
-// SHA-256 hash function
-int nostr_sha256(const unsigned char* data, size_t len, unsigned char* hash);
-
-// HMAC-SHA256
-int nostr_hmac_sha256(const unsigned char* key, size_t key_len,
-                      const unsigned char* data, size_t data_len,
-                      unsigned char* output);
-
-// HMAC-SHA512
-int nostr_hmac_sha512(const unsigned char* key, size_t key_len,
-                      const unsigned char* data, size_t data_len,
-                      unsigned char* output);
-
-// PBKDF2 with HMAC-SHA512
-int nostr_pbkdf2_hmac_sha512(const unsigned char* password, size_t password_len,
-                             const unsigned char* salt, size_t salt_len,
-                             int iterations,
-                             unsigned char* output, size_t output_len);
-
-// SHA-512 implementation (for testing)
-int nostr_sha512(const unsigned char* data, size_t len, unsigned char* hash);
-
-// =============================================================================
-// SECP256K1 ELLIPTIC CURVE FUNCTIONS
-// =============================================================================
-
-// Verify private key is valid
-int nostr_ec_private_key_verify(const unsigned char* private_key);
-
-// Generate public key from private key
-int nostr_ec_public_key_from_private_key(const unsigned char* private_key,
-                                        unsigned char* public_key);
-
-// Sign data with ECDSA
-int nostr_ec_sign(const unsigned char* private_key,
-                  const unsigned char* hash,
-                  unsigned char* signature);
-
-// RFC 6979 deterministic nonce generation
-int nostr_rfc6979_generate_k(const unsigned char* private_key,
-                            const unsigned char* message_hash,
-                            unsigned char* k_out);
-
-// =============================================================================
-// HKDF KEY DERIVATION FUNCTIONS
-// =============================================================================
-
-// HKDF Extract step
-int nostr_hkdf_extract(const unsigned char* salt, size_t salt_len,
-                      const unsigned char* ikm, size_t ikm_len,
-                      unsigned char* prk);
-
-// HKDF Expand step
-int nostr_hkdf_expand(const unsigned char* prk, size_t prk_len,
-                     const unsigned char* info, size_t info_len,
-                     unsigned char* okm, size_t okm_len);
-
-// HKDF (Extract + Expand)
-int nostr_hkdf(const unsigned char* salt, size_t salt_len,
-              const unsigned char* ikm, size_t ikm_len,
-              const unsigned char* info, size_t info_len,
-              unsigned char* okm, size_t okm_len);
-
-// ECDH shared secret computation (for debugging)
-int ecdh_shared_secret(const unsigned char* private_key, 
-                      const unsigned char* public_key_x, 
-                      unsigned char* shared_secret);
-
-// Base64 encoding function (for debugging)
-size_t base64_encode(const unsigned char* data, size_t len, char* output, size_t output_size);
-
-// =============================================================================
-// NIP-04 AND NIP-44 ENCRYPTION FUNCTIONS
-// =============================================================================
-
-// Note: NOSTR_NIP04_MAX_PLAINTEXT_SIZE already defined in nostr_core.h
-#define NOSTR_NIP44_MAX_PLAINTEXT_SIZE 65536
-
-// NIP-04 encryption (AES-256-CBC)
-int nostr_nip04_encrypt(const unsigned char* sender_private_key,
-                       const unsigned char* recipient_public_key,
-                       const char* plaintext,
-                       char* output,
-                       size_t output_size);
-
-// NIP-04 decryption
-int nostr_nip04_decrypt(const unsigned char* recipient_private_key,
-                       const unsigned char* sender_public_key,
-                       const char* encrypted_data,
-                       char* output,
-                       size_t output_size);
-
-// NIP-44 encryption (ChaCha20-Poly1305)
-int nostr_nip44_encrypt(const unsigned char* sender_private_key,
-                       const unsigned char* recipient_public_key,
-                       const char* plaintext,
-                       char* output,
-                       size_t output_size);
-
-// NIP-44 encryption with fixed nonce (for testing)
-int nostr_nip44_encrypt_with_nonce(const unsigned char* sender_private_key,
-                                  const unsigned char* recipient_public_key,
-                                  const char* plaintext,
-                                  const unsigned char* nonce,
-                                  char* output,
-                                  size_t output_size);
-
-// NIP-44 decryption
-int nostr_nip44_decrypt(const unsigned char* recipient_private_key,
-                       const unsigned char* sender_public_key,
-                       const char* encrypted_data,
-                       char* output,
-                       size_t output_size);
-
-// =============================================================================
-// BIP39 MNEMONIC FUNCTIONS
-// =============================================================================
-
-// Generate mnemonic from entropy
-int nostr_bip39_mnemonic_from_bytes(const unsigned char* entropy, size_t entropy_len,
-                                   char* mnemonic);
-
-// Validate mnemonic
-int nostr_bip39_mnemonic_validate(const char* mnemonic);
-
-// Convert mnemonic to seed
-int nostr_bip39_mnemonic_to_seed(const char* mnemonic, const char* passphrase,
-                                unsigned char* seed, size_t seed_len);
-
-// =============================================================================
-// BIP32 HD WALLET FUNCTIONS
-// =============================================================================
-
-typedef struct {
-    unsigned char private_key[32];
-    unsigned char public_key[33];
-    unsigned char chain_code[32];
-    uint32_t depth;
-    uint32_t parent_fingerprint;
-    uint32_t child_number;
-} nostr_hd_key_t;
-
-// Create master key from seed
-int nostr_bip32_key_from_seed(const unsigned char* seed, size_t seed_len,
-                             nostr_hd_key_t* master_key);
-
-// Derive child key from parent
-int nostr_bip32_derive_child(const nostr_hd_key_t* parent_key, uint32_t child_number,
-                            nostr_hd_key_t* child_key);
-
-// Derive key from path
-int nostr_bip32_derive_path(const nostr_hd_key_t* master_key, const uint32_t* path,
-                           size_t path_len, nostr_hd_key_t* derived_key);
-
-#ifdef __cplusplus
-}
-#endif
-
-#endif // NOSTR_CRYPTO_H
@@ -0,0 +1,54 @@
+#include "nostr_log.h"
+
+#include <stdio.h>
+
+#define NOSTR_LOG_BUFFER_SIZE 4096
+
+static nostr_log_callback_t g_log_callback = NULL;
+static void* g_log_user_data = NULL;
+static int g_log_min_level = NOSTR_LOG_LEVEL_ERROR;
+
+void nostr_set_log_callback(nostr_log_callback_t cb, void* user_data) {
+    g_log_callback = cb;
+    g_log_user_data = user_data;
+}
+
+void nostr_set_log_level(nostr_log_level_t min_level) {
+    if (min_level < NOSTR_LOG_LEVEL_ERROR) {
+        g_log_min_level = NOSTR_LOG_LEVEL_ERROR;
+        return;
+    }
+    if (min_level > NOSTR_LOG_LEVEL_TRACE) {
+        g_log_min_level = NOSTR_LOG_LEVEL_TRACE;
+        return;
+    }
+    g_log_min_level = (int)min_level;
+}
+
+void nostr_log_vemitf(int level, const char* component, const char* format, va_list args) {
+    if (!g_log_callback || !format) {
+        return;
+    }
+    if (level < g_log_min_level) {
+        return;
+    }
+
+    char message[NOSTR_LOG_BUFFER_SIZE];
+    int written = vsnprintf(message, sizeof(message), format, args);
+    if (written < 0) {
+        return;
+    }
+    message[sizeof(message) - 1] = '\0';
+
+    g_log_callback(level,
+                   component ? component : "unknown",
+                   message,
+                   g_log_user_data);
+}
+
+void nostr_log_emitf(int level, const char* component, const char* format, ...) {
+    va_list args;
+    va_start(args, format);
+    nostr_log_vemitf(level, component, format, args);
+    va_end(args);
+}
@@ -0,0 +1,35 @@
+#ifndef NOSTR_LOG_H
+#define NOSTR_LOG_H
+
+#include <stdarg.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+typedef enum {
+    NOSTR_LOG_LEVEL_ERROR = 1,
+    NOSTR_LOG_LEVEL_WARN = 2,
+    NOSTR_LOG_LEVEL_INFO = 3,
+    NOSTR_LOG_LEVEL_DEBUG = 4,
+    NOSTR_LOG_LEVEL_TRACE = 5
+} nostr_log_level_t;
+
+typedef void (*nostr_log_callback_t)(
+    int level,
+    const char* component,
+    const char* message,
+    void* user_data
+);
+
+void nostr_set_log_callback(nostr_log_callback_t cb, void* user_data);
+void nostr_set_log_level(nostr_log_level_t min_level);
+
+void nostr_log_emitf(int level, const char* component, const char* format, ...);
+void nostr_log_vemitf(int level, const char* component, const char* format, va_list args);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* NOSTR_LOG_H */
@@ -1,141 +0,0 @@
-#ifndef NOSTR_SECP256K1_H
-#define NOSTR_SECP256K1_H
-
-#ifdef __cplusplus
-extern "C" {
-#endif
-
-#include <stddef.h>
-
-/** Opaque data structure that holds a parsed and valid public key.
- *  Guaranteed to be 64 bytes in size, and can be safely copied/moved.
- */
-typedef struct nostr_secp256k1_pubkey {
-    unsigned char data[64];
-} nostr_secp256k1_pubkey;
-
-/** Opaque data structure that holds a parsed keypair.
- *  Guaranteed to be 96 bytes in size, and can be safely copied/moved.
- */
-typedef struct nostr_secp256k1_keypair {
-    unsigned char data[96];
-} nostr_secp256k1_keypair;
-
-/** Opaque data structure that holds a parsed x-only public key.
- *  Guaranteed to be 64 bytes in size, and can be safely copied/moved.
- */
-typedef struct nostr_secp256k1_xonly_pubkey {
-    unsigned char data[64];
-} nostr_secp256k1_xonly_pubkey;
-
-/** Initialize the secp256k1 library. Must be called before any other functions.
- *  Returns: 1 on success, 0 on failure.
- */
-int nostr_secp256k1_context_create(void);
-
-/** Clean up the secp256k1 library resources.
- */
-void nostr_secp256k1_context_destroy(void);
-
-/** Verify an elliptic curve secret key.
- *  Returns: 1: secret key is valid, 0: secret key is invalid
- *  In: seckey: pointer to a 32-byte secret key.
- */
-int nostr_secp256k1_ec_seckey_verify(const unsigned char *seckey);
-
-/** Compute the public key for a secret key.
- *  Returns: 1: secret was valid, public key stored. 0: secret was invalid.
- *  Out: pubkey: pointer to the created public key.
- *  In:  seckey: pointer to a 32-byte secret key.
- */
-int nostr_secp256k1_ec_pubkey_create(nostr_secp256k1_pubkey *pubkey, const unsigned char *seckey);
-
-/** Create a keypair from a secret key.
- *  Returns: 1: keypair created, 0: secret key invalid.
- *  Out: keypair: pointer to the created keypair.
- *  In:  seckey:  pointer to a 32-byte secret key.
- */
-int nostr_secp256k1_keypair_create(nostr_secp256k1_keypair *keypair, const unsigned char *seckey);
-
-/** Get the x-only public key from a keypair.
- *  Returns: 1 always.
- *  Out: pubkey: pointer to storage for the x-only public key.
- *  In:  keypair: pointer to a keypair.
- */
-int nostr_secp256k1_keypair_xonly_pub(nostr_secp256k1_xonly_pubkey *pubkey, const nostr_secp256k1_keypair *keypair);
-
-/** Parse an x-only public key from bytes.
- *  Returns: 1: public key parsed, 0: invalid public key.
- *  Out: pubkey: pointer to the created x-only public key.
- *  In:  input32: pointer to a 32-byte x-only public key.
- */
-int nostr_secp256k1_xonly_pubkey_parse(nostr_secp256k1_xonly_pubkey *pubkey, const unsigned char *input32);
-
-/** Serialize an x-only public key to bytes.
- *  Returns: 1 always.
- *  Out: output32: pointer to a 32-byte array to store the serialized key.
- *  In:  pubkey:   pointer to an x-only public key.
- */
-int nostr_secp256k1_xonly_pubkey_serialize(unsigned char *output32, const nostr_secp256k1_xonly_pubkey *pubkey);
-
-/** Create a Schnorr signature.
- *  Returns: 1: signature created, 0: nonce generation failed or secret key invalid.
- *  Out: sig64:     pointer to a 64-byte array where the signature will be placed.
- *  In:  msghash32: the 32-byte message hash being signed.
- *       keypair:   pointer to an initialized keypair.
- *       aux_rand32: pointer to 32 bytes of auxiliary randomness (can be NULL).
- */
-int nostr_secp256k1_schnorrsig_sign32(unsigned char *sig64, const unsigned char *msghash32, const nostr_secp256k1_keypair *keypair, const unsigned char *aux_rand32);
-
-/** Verify a Schnorr signature.
- *  Returns: 1: correct signature, 0: incorrect signature
- *  In: sig64:     pointer to the 64-byte signature being verified.
- *      msghash32: the 32-byte message hash being verified.
- *      pubkey:    pointer to an x-only public key to verify with.
- */
-int nostr_secp256k1_schnorrsig_verify(const unsigned char *sig64, const unsigned char *msghash32, const nostr_secp256k1_xonly_pubkey *pubkey);
-
-/** Serialize a pubkey object into a serialized byte sequence.
- *  Returns: 1 always.
- *  Out: output:     pointer to a 33-byte array to place the serialized key in.
- *  In:  pubkey:     pointer to a secp256k1_pubkey containing an initialized public key.
- *
- *  The output will be a 33-byte compressed public key (0x02 or 0x03 prefix + 32 bytes x coordinate).
- */
-int nostr_secp256k1_ec_pubkey_serialize_compressed(unsigned char *output, const nostr_secp256k1_pubkey *pubkey);
-
-/** Tweak a secret key by adding a 32-byte tweak to it.
- *  Returns: 1: seckey was valid, 0: seckey invalid or resulting key invalid
- *  In/Out: seckey: pointer to a 32-byte secret key. Will be modified in-place.
- *  In:     tweak:  pointer to a 32-byte tweak.
- */
-int nostr_secp256k1_ec_seckey_tweak_add(unsigned char *seckey, const unsigned char *tweak);
-
-/** Parse a variable-length public key into the pubkey object.
- *  Returns: 1: public key parsed, 0: invalid public key.
- *  Out: pubkey: pointer to the created public key.
- *  In:  input:  pointer to a serialized public key
- *       inputlen: length of the array pointed to by input
- */
-int nostr_secp256k1_ec_pubkey_parse(nostr_secp256k1_pubkey *pubkey, const unsigned char *input, size_t inputlen);
-
-/** Compute an EC Diffie-Hellman secret in constant time.
- *  Returns: 1: exponentiation was successful, 0: scalar was invalid (zero or overflow)
- *  Out: result: a 32-byte array which will be populated by an ECDH secret computed from point and scalar
- *  In:  pubkey: a pointer to a secp256k1_pubkey containing an initialized public key
- *       seckey: a 32-byte scalar with which to multiply the point
- */
-int nostr_secp256k1_ecdh(unsigned char *result, const nostr_secp256k1_pubkey *pubkey, const unsigned char *seckey, void *hashfp, void *data);
-
-/** Generate cryptographically secure random bytes.
- *  Returns: 1: success, 0: failure
- *  Out: buf: buffer to fill with random bytes
- *  In:  len: number of bytes to generate
- */
-int nostr_secp256k1_get_random_bytes(unsigned char *buf, size_t len);
-
-#ifdef __cplusplus
-}
-#endif
-
-#endif /* NOSTR_SECP256K1_H */
@@ -0,0 +1,274 @@
+/*
+ * NOSTR Core Library - Request Validator
+ * 
+ * Unified authentication and authorization system for NOSTR applications.
+ * Provides rule-based validation for requests with pluggable database backends.
+ * 
+ * This module combines basic NOSTR event validation with sophisticated 
+ * authentication rules to provide a single entry point for request validation
+ * across different NOSTR applications (ginxsom, c-relay, etc.).
+ */
+
+#ifndef NOSTR_REQUEST_VALIDATOR_H
+#define NOSTR_REQUEST_VALIDATOR_H
+
+#include "nostr_common.h"
+#include <time.h>
+#include <sqlite3.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+// Forward declaration for cJSON
+struct cJSON;
+
+// Authentication rule types
+typedef enum {
+    NOSTR_AUTH_RULE_PUBKEY_WHITELIST,
+    NOSTR_AUTH_RULE_PUBKEY_BLACKLIST,
+    NOSTR_AUTH_RULE_HASH_BLACKLIST,
+    NOSTR_AUTH_RULE_MIME_WHITELIST,
+    NOSTR_AUTH_RULE_MIME_BLACKLIST,
+    NOSTR_AUTH_RULE_SIZE_LIMIT,
+    NOSTR_AUTH_RULE_RATE_LIMIT,
+    NOSTR_AUTH_RULE_CUSTOM
+} nostr_auth_rule_type_t;
+
+// Authentication request context
+typedef struct {
+    const char* operation;        // Operation type ("upload", "delete", "list", "publish")
+    const char* auth_header;      // Raw authorization header (optional)
+    struct cJSON* event;          // NOSTR event for validation (optional)
+    
+    // Resource context (for file/blob operations)
+    const char* resource_hash;    // Resource hash (SHA-256, optional)
+    const char* mime_type;        // MIME type (optional)
+    long file_size;               // File size (optional)
+    
+    // Client context
+    const char* client_ip;        // Client IP for rate limiting (optional)
+    void* app_context;            // Application-specific context (optional)
+} nostr_request_t;
+
+// Authentication result
+typedef struct {
+    int valid;                    // 0 = invalid/denied, 1 = valid/allowed
+    int error_code;               // NOSTR_SUCCESS or specific error code
+    char reason[256];             // Human-readable reason for denial
+    char pubkey[65];              // Extracted pubkey from validated event (if available)
+    int rule_id;                  // Rule ID that made the decision (0 if no rule)
+    int priority;                 // Priority of the rule that matched
+    time_t cached_until;          // Cache expiration time
+} nostr_request_result_t;
+
+// Authentication rule definition
+typedef struct {
+    int rule_id;                  // Unique rule identifier
+    nostr_auth_rule_type_t type;  // Rule type
+    char operation[32];           // Target operation ("*", "upload", "delete", "publish", etc.)
+    char target[256];             // Rule target (pubkey, hash, mime pattern, etc.)
+    char value[256];              // Rule value (size limit, rate limit, custom data)
+    int priority;                 // Rule priority (lower number = higher priority)
+    int enabled;                  // 1 = enabled, 0 = disabled
+    time_t expires_at;            // Expiration timestamp (0 = never expires)
+    char description[512];        // Human-readable description
+    time_t created_at;            // Creation timestamp
+} nostr_auth_rule_t;
+
+// Database backend interface (pluggable)
+typedef struct nostr_auth_db_interface {
+    const char* name;             // Backend name ("sqlite", "redis", etc.)
+    
+    // Database lifecycle
+    int (*init)(const char* db_path, const char* app_name);
+    void (*cleanup)(void);
+    
+    // Configuration management
+    int (*get_config)(const char* key, char* value, size_t value_size);
+    int (*set_config)(const char* key, const char* value);
+    
+    // Rule querying and management
+    int (*query_rules)(const nostr_request_t* request, nostr_auth_rule_t** rules, int* count);
+    int (*rule_add)(const nostr_auth_rule_t* rule);
+    int (*rule_remove)(int rule_id);
+    int (*rule_update)(const nostr_auth_rule_t* rule);
+    int (*rule_list)(const char* operation, nostr_auth_rule_t** rules, int* count);
+    
+    // Caching operations
+    int (*cache_get)(const char* cache_key, nostr_request_result_t* result);
+    int (*cache_set)(const char* cache_key, const nostr_request_result_t* result, int ttl);
+    int (*cache_clear)(void);
+} nostr_auth_db_interface_t;
+
+//=============================================================================
+// CORE API FUNCTIONS
+//=============================================================================
+
+/**
+ * Initialize the request validator system with application database
+ * 
+ * @param app_db_path Path to application's SQLite database
+ * @param app_name Application name for logging/identification
+ * @return NOSTR_SUCCESS on success, error code on failure
+ */
+int nostr_request_validator_init(const char* app_db_path, const char* app_name);
+
+/**
+ * Initialize with shared database (future use)
+ * 
+ * @param shared_db_path Path to shared authentication database
+ * @param app_name Application name for logging/identification
+ * @return NOSTR_SUCCESS on success, error code on failure
+ */
+int nostr_request_validator_init_shared(const char* shared_db_path, const char* app_name);
+
+/**
+ * Main request validation function - validates both NOSTR events and authentication rules
+ * 
+ * @param request Request context with operation, auth header, and resource details
+ * @param result Result structure with validation outcome and details
+ * @return NOSTR_SUCCESS on successful validation processing, error code on system failure
+ */
+int nostr_validate_request(const nostr_request_t* request, nostr_request_result_t* result);
+
+/**
+ * Check if authentication rules system is enabled
+ * 
+ * @return 1 if enabled, 0 if disabled
+ */
+int nostr_auth_rules_enabled(void);
+
+/**
+ * Cleanup request validator resources
+ */
+void nostr_request_validator_cleanup(void);
+
+//=============================================================================
+// CONVENIENCE FUNCTIONS
+//=============================================================================
+
+/**
+ * Convenience function for upload validation (ginxsom integration)
+ * 
+ * @param pubkey Uploader public key (optional, extracted from auth if NULL)
+ * @param auth_header Authorization header with NOSTR event
+ * @param hash File hash (SHA-256)
+ * @param mime_type File MIME type
+ * @param file_size File size in bytes
+ * @return NOSTR_SUCCESS if allowed, error code if denied
+ */
+int nostr_auth_check_upload(const char* pubkey, const char* auth_header, 
+                           const char* hash, const char* mime_type, long file_size);
+
+/**
+ * Convenience function for delete validation (ginxsom integration)
+ * 
+ * @param pubkey Requester public key
+ * @param auth_header Authorization header with NOSTR event
+ * @param hash File hash to delete
+ * @return NOSTR_SUCCESS if allowed, error code if denied
+ */
+int nostr_auth_check_delete(const char* pubkey, const char* auth_header, const char* hash);
+
+/**
+ * Convenience function for publish validation (c-relay integration)
+ * 
+ * @param pubkey Publisher public key
+ * @param event NOSTR event to publish
+ * @return NOSTR_SUCCESS if allowed, error code if denied
+ */
+int nostr_auth_check_publish(const char* pubkey, struct cJSON* event);
+
+//=============================================================================
+// RULE MANAGEMENT FUNCTIONS
+//=============================================================================
+
+/**
+ * Add a new authentication rule
+ * 
+ * @param rule Rule definition to add
+ * @return NOSTR_SUCCESS on success, error code on failure
+ */
+int nostr_auth_rule_add(const nostr_auth_rule_t* rule);
+
+/**
+ * Remove an authentication rule by ID
+ * 
+ * @param rule_id Rule ID to remove
+ * @return NOSTR_SUCCESS on success, error code on failure
+ */
+int nostr_auth_rule_remove(int rule_id);
+
+/**
+ * Update an existing authentication rule
+ * 
+ * @param rule Updated rule definition
+ * @return NOSTR_SUCCESS on success, error code on failure
+ */
+int nostr_auth_rule_update(const nostr_auth_rule_t* rule);
+
+/**
+ * List authentication rules for a specific operation
+ * 
+ * @param operation Target operation ("*" for all operations)
+ * @param rules Pointer to receive allocated array of rules
+ * @param count Pointer to receive number of rules returned
+ * @return NOSTR_SUCCESS on success, error code on failure
+ */
+int nostr_auth_rule_list(const char* operation, nostr_auth_rule_t** rules, int* count);
+
+/**
+ * Free rule array allocated by nostr_auth_rule_list
+ * 
+ * @param rules Rule array to free
+ * @param count Number of rules in array
+ */
+void nostr_auth_rules_free(nostr_auth_rule_t* rules, int count);
+
+//=============================================================================
+// DATABASE BACKEND MANAGEMENT
+//=============================================================================
+
+/**
+ * Register a database backend implementation
+ * 
+ * @param backend Backend interface implementation
+ * @return NOSTR_SUCCESS on success, error code on failure
+ */
+int nostr_auth_register_db_backend(const nostr_auth_db_interface_t* backend);
+
+/**
+ * Set active database backend by name
+ * 
+ * @param backend_name Name of backend to activate
+ * @return NOSTR_SUCCESS on success, error code on failure
+ */
+int nostr_auth_set_db_backend(const char* backend_name);
+
+//=============================================================================
+// CACHE MANAGEMENT
+//=============================================================================
+
+/**
+ * Clear authentication decision cache
+ * 
+ * @return NOSTR_SUCCESS on success, error code on failure
+ */
+int nostr_auth_cache_clear(void);
+
+/**
+ * Get cache statistics
+ * 
+ * @param hit_count Pointer to receive cache hit count
+ * @param miss_count Pointer to receive cache miss count
+ * @param entries Pointer to receive current number of cache entries
+ * @return NOSTR_SUCCESS on success, error code on failure
+ */
+int nostr_auth_cache_stats(int* hit_count, int* miss_count, int* entries);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* NOSTR_REQUEST_VALIDATOR_H */
@@ -0,0 +1,189 @@
+/*
+ * NOSTR Core Library - Utilities
+ *
+ * General utility functions used across multiple NIPs
+ */
+
+#ifndef NOSTR_UTILS_H
+#define NOSTR_UTILS_H
+
+#include <stddef.h>
+#include <stdint.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+// =============================================================================
+// UTILITY FUNCTIONS
+// =============================================================================
+
+// Convert bytes to hexadecimal string
+void nostr_bytes_to_hex(const unsigned char *bytes, size_t len, char *hex);
+
+// Convert hexadecimal string to bytes
+int nostr_hex_to_bytes(const char *hex, unsigned char *bytes, size_t len);
+
+// Base64 encoding function 
+size_t base64_encode(const unsigned char *data, size_t len, char *output,
+                     size_t output_size);
+
+// Base64 decoding function
+size_t base64_decode(const char *input, unsigned char *output);
+
+
+// =============================================================================
+// CORE CRYPTO FUNCTIONS
+// =============================================================================
+
+// Initialize crypto subsystem
+int nostr_crypto_init(void);
+
+// Cleanup crypto subsystem
+void nostr_crypto_cleanup(void);
+
+// SHA-256 hash function
+int nostr_sha256(const unsigned char *data, size_t len, unsigned char *hash);
+
+// =============================================================================
+// STREAMING SHA-256 FUNCTIONS
+// =============================================================================
+
+// SHA-256 streaming context
+typedef struct {
+    uint32_t state[8];      // Current hash state
+    unsigned char buffer[64]; // Input buffer for incomplete blocks
+    uint64_t bitlen;        // Total bits processed
+    size_t buflen;          // Current buffer length
+} nostr_sha256_ctx_t;
+
+// Initialize SHA-256 streaming context
+int nostr_sha256_init(nostr_sha256_ctx_t* ctx);
+
+// Update SHA-256 context with new data
+int nostr_sha256_update(nostr_sha256_ctx_t* ctx, const unsigned char* data, size_t len);
+
+// Finalize SHA-256 and output hash
+int nostr_sha256_final(nostr_sha256_ctx_t* ctx, unsigned char* hash);
+
+// Stream SHA-256 hash of a file
+int nostr_sha256_file_stream(const char* filename, unsigned char* hash);
+
+// HMAC-SHA256
+int nostr_hmac_sha256(const unsigned char *key, size_t key_len,
+                      const unsigned char *data, size_t data_len,
+                      unsigned char *output);
+
+// HMAC-SHA512
+int nostr_hmac_sha512(const unsigned char *key, size_t key_len,
+                      const unsigned char *data, size_t data_len,
+                      unsigned char *output);
+
+// PBKDF2 with HMAC-SHA512
+int nostr_pbkdf2_hmac_sha512(const unsigned char *password, size_t password_len,
+                             const unsigned char *salt, size_t salt_len,
+                             int iterations, unsigned char *output,
+                             size_t output_len);
+
+// SHA-512 implementation (for testing)
+int nostr_sha512(const unsigned char *data, size_t len, unsigned char *hash);
+
+// =============================================================================
+// SECP256K1 ELLIPTIC CURVE FUNCTIONS
+// =============================================================================
+
+// Verify private key is valid
+int nostr_ec_private_key_verify(const unsigned char *private_key);
+
+// Generate public key from private key
+int nostr_ec_public_key_from_private_key(const unsigned char *private_key,
+                                         unsigned char *public_key);
+
+// Sign data with ECDSA
+int nostr_ec_sign(const unsigned char *private_key, const unsigned char *hash,
+                  unsigned char *signature);
+
+// RFC 6979 deterministic nonce generation
+int nostr_rfc6979_generate_k(const unsigned char *private_key,
+                             const unsigned char *message_hash,
+                             unsigned char *k_out);
+
+int nostr_schnorr_sign(const unsigned char* private_key,
+                       const unsigned char* hash,
+                       unsigned char* signature);
+
+
+// =============================================================================
+// HKDF KEY DERIVATION FUNCTIONS
+// =============================================================================
+
+// HKDF Extract step
+int nostr_hkdf_extract(const unsigned char *salt, size_t salt_len,
+                       const unsigned char *ikm, size_t ikm_len,
+                       unsigned char *prk);
+
+// HKDF Expand step
+int nostr_hkdf_expand(const unsigned char *prk, size_t prk_len,
+                      const unsigned char *info, size_t info_len,
+                      unsigned char *okm, size_t okm_len);
+
+// HKDF (Extract + Expand)
+int nostr_hkdf(const unsigned char *salt, size_t salt_len,
+               const unsigned char *ikm, size_t ikm_len,
+               const unsigned char *info, size_t info_len, unsigned char *okm,
+               size_t okm_len);
+
+// ECDH shared secret computation (for debugging)
+int ecdh_shared_secret(const unsigned char *private_key,
+                       const unsigned char *public_key_x,
+                       unsigned char *shared_secret);
+
+
+
+
+// =============================================================================
+// BIP39 MNEMONIC FUNCTIONS
+// =============================================================================
+
+// Generate mnemonic from entropy
+int nostr_bip39_mnemonic_from_bytes(const unsigned char *entropy,
+                                    size_t entropy_len, char *mnemonic);
+
+// Validate mnemonic
+int nostr_bip39_mnemonic_validate(const char *mnemonic);
+
+// Convert mnemonic to seed
+int nostr_bip39_mnemonic_to_seed(const char *mnemonic, const char *passphrase,
+                                 unsigned char *seed, size_t seed_len);
+
+// =============================================================================
+// BIP32 HD WALLET FUNCTIONS
+// =============================================================================
+
+typedef struct {
+  unsigned char private_key[32];
+  unsigned char public_key[33];
+  unsigned char chain_code[32];
+  uint32_t depth;
+  uint32_t parent_fingerprint;
+  uint32_t child_number;
+} nostr_hd_key_t;
+
+// Create master key from seed
+int nostr_bip32_key_from_seed(const unsigned char *seed, size_t seed_len,
+                              nostr_hd_key_t *master_key);
+
+// Derive child key from parent
+int nostr_bip32_derive_child(const nostr_hd_key_t *parent_key,
+                             uint32_t child_number, nostr_hd_key_t *child_key);
+
+// Derive key from path
+int nostr_bip32_derive_path(const nostr_hd_key_t *master_key,
+                            const uint32_t *path, size_t path_len,
+                            nostr_hd_key_t *derived_key);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif // NOSTR_UTILS_H
@@ -0,0 +1,10 @@
+{
+	"folders": [
+		{
+			"path": "."
+		}
+	],
+	"settings": {
+		"git.ignoreLimitWarning": true
+	}
+}
@@ -8,11 +8,11 @@ The NOSTR WebSocket library consists of these key files for export:

 ### Core Files (Required)
 - `nostr_websocket_tls.h` - Header with all function declarations and constants
- `nostr_websocket_mbedtls.c` - Main implementation using mbedTLS for SSL/TLS
+- `nostr_websocket_openssl.c` - Main implementation using OpenSSL for SSL/TLS
 - `../cjson/cJSON.h` and `../cjson/cJSON.c` - JSON parsing (lightweight)

 ### Dependencies
- **mbedTLS** - For SSL/TLS support (wss:// connections)
+- **OpenSSL** - For SSL/TLS support (wss:// connections) - libssl, libcrypto
 - **Standard C libraries** - socket, networking, etc.

 ## Quick Integration
@@ -21,23 +21,29 @@ The NOSTR WebSocket library consists of these key files for export:
 ```bash
 # Copy the library files
 cp nostr_websocket_tls.h your_project/
-cp nostr_websocket_mbedtls.c your_project/
+cp nostr_websocket_openssl.c your_project/
 cp ../cjson/cJSON.h your_project/
 cp ../cjson/cJSON.c your_project/
 ```

-### 2. Install mbedTLS Dependency
+### 2. Install OpenSSL Dependency
 ```bash
 # Ubuntu/Debian
-sudo apt-get install libmbedtls-dev
+sudo apt-get install libssl-dev

-# Or build from source (see mbedTLS documentation)
+# CentOS/RHEL/Fedora
+sudo yum install openssl-devel
+# or
+sudo dnf install openssl-devel
+
+# macOS (via Homebrew)
+brew install openssl
 ```

 ### 3. Compile Your Project
 ```bash
-gcc -o my_nostr_app my_app.c nostr_websocket_mbedtls.c cJSON.c \
-    -lmbedtls -lmbedx509 -lmbedcrypto -lm
+gcc -o my_nostr_app my_app.c nostr_websocket_openssl.c cJSON.c \
+    -lssl -lcrypto -lm
 ```

 ## Basic Usage Example
@@ -131,16 +137,17 @@ The library supports both TCP (`ws://`) and TLS (`wss://`) automatically based o

 ### Linux/Unix
 - Works out of the box with standard development tools
- Requires: gcc, mbedTLS development headers
+- Requires: gcc, OpenSSL development headers (libssl-dev)

-### Potential Windows Support
+### Windows Support
 - Would need Winsock2 adaptations in transport layer
- mbedTLS is cross-platform compatible
+- OpenSSL is widely available on Windows

 ### Embedded Systems
 - Lightweight design suitable for embedded use
 - Memory usage: ~4KB per client + message buffers
 - No dynamic allocations in hot paths
+- OpenSSL provides optimized implementations for various architectures

 ## Library Design Benefits

@@ -178,7 +185,21 @@ The library handles all WebSocket protocol details, SSL/TLS, and NOSTR message f

 - Based on WebSocket RFC 6455
 - Implements NOSTR WebSocket conventions
- SSL/TLS via proven mbedTLS library
+- SSL/TLS via industry-standard OpenSSL library
 - Tested with major NOSTR relays

+## Migration Notes
+
+If you were previously using the mbedTLS version of this library:
+
+### Code Changes Required
+- Update `#include` to reference `nostr_websocket_openssl.c` instead of `nostr_websocket_mbedtls.c`
+- Change linking flags from `-lmbedtls -lmbedx509 -lmbedcrypto` to `-lssl -lcrypto`
+- Install OpenSSL development headers instead of mbedTLS
+
+### API Compatibility
+- All function signatures remain identical
+- No changes to your application code required
+- Same performance characteristics and behavior
+
 This library provides a clean, efficient way to integrate NOSTR WebSocket functionality into any C project with minimal dependencies and maximum portability.
@@ -1,63 +0,0 @@
-# NOSTR WebSocket Library Makefile
-# Production-ready WebSocket implementation for NOSTR protocol
-
-CC = gcc
-CFLAGS = -Wall -Wextra -std=c99 -O2
-INCLUDES = -I. -I.. -I../mbedtls/include -I../mbedtls/tf-psa-crypto/include -I../mbedtls/tf-psa-crypto/drivers/builtin/include
-LIBS = -lm -L../mbedtls/library -lmbedtls -lmbedx509 -lmbedcrypto
-
-# Source files
-WEBSOCKET_SOURCES = nostr_websocket_mbedtls.c ../cjson/cJSON.c
-WEBSOCKET_HEADERS = nostr_websocket_tls.h ../cjson/cJSON.h
-
-# Test programs
-TEST_SOURCES = test_5_events_clean.c
-TEST_PROGRAMS = test_5_events_clean
-
-# Object files
-WEBSOCKET_OBJECTS = $(WEBSOCKET_SOURCES:.c=.o)
-
-.PHONY: all clean test
-
-all: $(TEST_PROGRAMS)
-
-# Test programs
-test_5_events_clean: test_5_events_clean.o $(WEBSOCKET_OBJECTS)
-	$(CC) -o $@ $^ $(LIBS)
-
-# Object file compilation
-%.o: %.c $(WEBSOCKET_HEADERS)
-	$(CC) $(CFLAGS) $(INCLUDES) -c $< -o $@
-
-# Test target
-test: test_5_events_clean
-	@echo "🧪 Running WebSocket test..."
-	@echo "Press Ctrl-C to stop the test"
-	./test_5_events_clean
-
-# Clean build artifacts
-clean:
-	rm -f *.o $(TEST_PROGRAMS)
-	rm -f ../cjson/*.o
-
-# Display library info
-info:
-	@echo "📚 NOSTR WebSocket Library"
-	@echo "=========================="
-	@echo "Core files:"
-	@echo "  - nostr_websocket_tls.h (header)"
-	@echo "  - nostr_websocket_mbedtls.c (implementation)"
-	@echo "  - ../cjson/cJSON.h/c (JSON support)"
-	@echo ""
-	@echo "Dependencies:"
-	@echo "  - mbedTLS (SSL/TLS support)"
-	@echo "  - Standard C libraries"
-	@echo ""
-	@echo "Usage:"
-	@echo "  make          - Build test programs"
-	@echo "  make test     - Run WebSocket test"
-	@echo "  make clean    - Clean build artifacts"
-	@echo "  make info     - Show this information"
-
-# Help target
-help: info
@@ -5,7 +5,7 @@ A production-ready, lightweight WebSocket client library specifically designed f
 ## Features

 - ✅ **WebSocket RFC 6455 Compliant** - Full WebSocket protocol implementation
- ✅ **SSL/TLS Support** - Secure `wss://` connections via mbedTLS
+- ✅ **SSL/TLS Support** - Secure `wss://` connections via OpenSSL
 - ✅ **NOSTR Protocol** - Built-in support for REQ, EVENT, CLOSE messages
 - ✅ **Production Ready** - Optimized performance and error handling
 - ✅ **Lightweight** - Minimal dependencies and memory footprint
@@ -54,11 +54,11 @@ cJSON_Delete(filter);

 ### Core Components
 - **`nostr_websocket_tls.h`** - Public API header
- **`nostr_websocket_mbedtls.c`** - Main implementation (mbedTLS backend)
+- **`nostr_websocket_openssl.c`** - Main implementation (OpenSSL backend)
 - **`../cjson/cJSON.h/c`** - JSON parsing support

 ### Dependencies
- **mbedTLS** - For SSL/TLS support
+- **OpenSSL** - For SSL/TLS support (libssl, libcrypto)
 - **Standard C libraries** - POSIX sockets, etc.

 ## Installation in Other Projects
@@ -121,14 +121,16 @@ make help     # Show help

 ## Development History

-This library evolved from the experimental WebSocket implementation in `../websocket_experiment/` and represents the production-ready, stable version suitable for integration into other projects.
+This library evolved from the experimental WebSocket implementation and represents the production-ready, stable version suitable for integration into other projects.

 Key improvements made during development:
+- **Migrated from mbedTLS to OpenSSL** - Better compatibility and performance
 - Fixed critical WebSocket frame parsing bugs
 - Optimized SSL/TLS performance
 - Reduced memory allocations
 - Enhanced error handling
 - Added comprehensive documentation
+- Improved build system integration

 ## License

@@ -1,5 +1,6 @@
 #define _GNU_SOURCE
 #include "nostr_websocket_tls.h"
+#include "../nostr_core/nostr_log.h"
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
@@ -12,14 +13,11 @@
 #include <time.h>
 #include <sys/select.h>

-// mbedTLS headers
-#include "mbedtls/ssl.h"
-#include "mbedtls/entropy.h"
-#include "mbedtls/ctr_drbg.h"
-#include "mbedtls/net_sockets.h"
-#include "mbedtls/error.h"
-#include "mbedtls/debug.h"
-#include "psa/crypto.h"
+// OpenSSL headers
+#include <openssl/ssl.h>
+#include <openssl/err.h>
+#include <openssl/rand.h>
+#include <openssl/x509v3.h>

 // WebSocket magic string for handshake
 #define WS_MAGIC_STRING "258EAFA5-E914-47DA-95CA-C5AB0DC85B11"
@@ -27,14 +25,6 @@
 #define MAX_HEADER_SIZE 4096
 #define MAX_FRAME_SIZE 65536

-// Debug logging (conditional compilation)
-#if defined(ENABLE_FILE_LOGGING) && defined(ENABLE_WEBSOCKET_LOGGING)
-static FILE* debug_log_file = NULL;
-static void debug_log_init(void);
-static void debug_log_message(const char* direction, const char* host, int port, const char* message);
-static const char* get_timestamp(void);
-#endif
-
 // Transport layer abstraction
 typedef struct {
    int (*connect)(void* ctx, const char* host, int port);
@@ -49,13 +39,11 @@ typedef struct {
    int socket_fd;
 } tcp_transport_t;

-// TLS transport context (mbedTLS)
+// TLS transport context (OpenSSL)
 typedef struct {
    int socket_fd;
-    mbedtls_ssl_context ssl;
-    mbedtls_ssl_config conf;
-    mbedtls_entropy_context entropy;
-    mbedtls_ctr_drbg_context ctr_drbg;
+    SSL_CTX* ssl_ctx;
+    SSL* ssl;
    int ssl_connected;
 } tls_transport_t;

@@ -117,12 +105,28 @@ static transport_ops_t tls_transport_ops = {
    .cleanup = tls_cleanup
 };

+// Global OpenSSL initialization flag
+static int openssl_initialized = 0;
+
+// Initialize OpenSSL
+static void init_openssl(void) {
+    if (!openssl_initialized) {
+        SSL_load_error_strings();
+        SSL_library_init();
+        OpenSSL_add_all_algorithms();
+        openssl_initialized = 1;
+    }
+}
+
 // ============================================================================
 // Core WebSocket Functions
 // ============================================================================

 nostr_ws_client_t* nostr_ws_connect(const char* url) {
    if (!url) return NULL;
+
+    // Initialize OpenSSL
+    init_openssl();
    
    nostr_ws_client_t* client = calloc(1, sizeof(nostr_ws_client_t));
    if (!client) return NULL;
@@ -442,6 +446,13 @@ static int tcp_connect(void* ctx, const char* host, int port) {
        tcp->socket_fd = -1;
        return -1;
    }
+
+    // Safety timeout: prevent indefinite blocking in recv/send on half-broken sockets.
+    struct timeval io_timeout;
+    io_timeout.tv_sec = 5;
+    io_timeout.tv_usec = 0;
+    (void)setsockopt(tcp->socket_fd, SOL_SOCKET, SO_RCVTIMEO, &io_timeout, sizeof(io_timeout));
+    (void)setsockopt(tcp->socket_fd, SOL_SOCKET, SO_SNDTIMEO, &io_timeout, sizeof(io_timeout));
    
    return 0;
 }
@@ -485,45 +496,9 @@ static void tcp_cleanup(void* ctx) {
 }

 // ============================================================================
-// TLS Transport Implementation (mbedTLS)
+// TLS Transport Implementation (OpenSSL)
 // ============================================================================

-// Custom certificate verification callback (accept all certificates for NOSTR)
-static int verify_cert(void *data, mbedtls_x509_crt *crt, int depth, uint32_t *flags) {
-    (void)data; (void)crt; (void)depth;
-    *flags = 0; // Clear all verification flags (accept any certificate)
-    return 0;
-}
-
-// Custom send function for mbedTLS
-static int mbedtls_send(void *ctx, const unsigned char *buf, size_t len) {
-    int sock_fd = *((int*)ctx);
-    ssize_t sent = send(sock_fd, buf, len, MSG_NOSIGNAL);
-    if (sent < 0) {
-        if (errno == EAGAIN || errno == EWOULDBLOCK) {
-            return MBEDTLS_ERR_SSL_WANT_WRITE;
-        }
-        return MBEDTLS_ERR_NET_SEND_FAILED;
-    }
-    return sent;
-}
-
-// Custom receive function for mbedTLS
-static int mbedtls_recv(void *ctx, unsigned char *buf, size_t len) {
-    int sock_fd = *((int*)ctx);
-    ssize_t received = recv(sock_fd, buf, len, 0);
-    if (received < 0) {
-        if (errno == EAGAIN || errno == EWOULDBLOCK) {
-            return MBEDTLS_ERR_SSL_WANT_READ;
-        }
-        return MBEDTLS_ERR_NET_RECV_FAILED;
-    }
-    if (received == 0) {
-        return MBEDTLS_ERR_SSL_PEER_CLOSE_NOTIFY;
-    }
-    return received;
-}
-
 static int tls_connect(void* ctx, const char* host, int port) {
    tls_transport_t* tls = (tls_transport_t*)ctx;
    int ret;
@@ -535,68 +510,50 @@ static int tls_connect(void* ctx, const char* host, int port) {
    }
    tls->socket_fd = tcp_ctx.socket_fd;
    
-    // Initialize PSA crypto (required for this version of mbedTLS)
-    psa_status_t psa_status = psa_crypto_init();
-    if (psa_status != PSA_SUCCESS) {
+    // Create SSL context
+    tls->ssl_ctx = SSL_CTX_new(TLS_client_method());
+    if (!tls->ssl_ctx) {
        goto cleanup;
    }
    
-    // Initialize mbedTLS structures
-    mbedtls_ssl_init(&tls->ssl);
-    mbedtls_ssl_config_init(&tls->conf);
-    mbedtls_entropy_init(&tls->entropy);
-    mbedtls_ctr_drbg_init(&tls->ctr_drbg);
-    
-    // Seed the random number generator
-    const char *pers = "nostr_ws_client";
-    if ((ret = mbedtls_ctr_drbg_seed(&tls->ctr_drbg, mbedtls_entropy_func, &tls->entropy,
-                               (const unsigned char *)pers, strlen(pers))) != 0) {
-        goto cleanup;
-    }
-    
-    // Set up SSL configuration
-    if ((ret = mbedtls_ssl_config_defaults(&tls->conf,
-                    MBEDTLS_SSL_IS_CLIENT,
-                    MBEDTLS_SSL_TRANSPORT_STREAM,
-                    MBEDTLS_SSL_PRESET_DEFAULT)) != 0) {
-        goto cleanup;
-    }
-    
-    // RNG is configured automatically through mbedtls_ssl_config_defaults
-    // The CTR_DRBG we initialized should be used automatically
+    // Set up SSL context options
+    SSL_CTX_set_options(tls->ssl_ctx, SSL_OP_NO_SSLv2 | SSL_OP_NO_SSLv3);
    
    // Disable certificate verification for NOSTR (we only need encryption)
-    mbedtls_ssl_conf_authmode(&tls->conf, MBEDTLS_SSL_VERIFY_NONE);
-    mbedtls_ssl_conf_verify(&tls->conf, verify_cert, NULL);
+    SSL_CTX_set_verify(tls->ssl_ctx, SSL_VERIFY_NONE, NULL);
    
-    // Set up SSL context
-    if ((ret = mbedtls_ssl_setup(&tls->ssl, &tls->conf)) != 0) {
+    // Create SSL connection
+    tls->ssl = SSL_new(tls->ssl_ctx);
+    if (!tls->ssl) {
        goto cleanup;
    }
    
    // Set hostname for SNI
-    if ((ret = mbedtls_ssl_set_hostname(&tls->ssl, host)) != 0) {
+    SSL_set_tlsext_host_name(tls->ssl, host);
+    
+    // Associate socket with SSL connection
+    if (SSL_set_fd(tls->ssl, tls->socket_fd) != 1) {
        goto cleanup;
    }
    
-    // Set I/O functions
-    mbedtls_ssl_set_bio(&tls->ssl, &tls->socket_fd, mbedtls_send, mbedtls_recv, NULL);
-    
    // Perform TLS handshake
-    while ((ret = mbedtls_ssl_handshake(&tls->ssl)) != 0) {
-        if (ret != MBEDTLS_ERR_SSL_WANT_READ && ret != MBEDTLS_ERR_SSL_WANT_WRITE) {
-            goto cleanup;
-        }
+    ret = SSL_connect(tls->ssl);
+    if (ret <= 0) {
+        goto cleanup;
    }
    
    tls->ssl_connected = 1;
    return 0;
    
 cleanup:
-    mbedtls_ssl_free(&tls->ssl);
-    mbedtls_ssl_config_free(&tls->conf);
-    mbedtls_ctr_drbg_free(&tls->ctr_drbg);
-    mbedtls_entropy_free(&tls->entropy);
+    if (tls->ssl) {
+        SSL_free(tls->ssl);
+        tls->ssl = NULL;
+    }
+    if (tls->ssl_ctx) {
+        SSL_CTX_free(tls->ssl_ctx);
+        tls->ssl_ctx = NULL;
+    }
    close(tls->socket_fd);
    tls->socket_fd = -1;
    return -1;
@@ -604,11 +561,12 @@ cleanup:

 static int tls_send(void* ctx, const void* data, size_t len) {
    tls_transport_t* tls = (tls_transport_t*)ctx;
-    if (!tls->ssl_connected) return -1;
+    if (!tls->ssl_connected || !tls->ssl) return -1;
    
-    int ret = mbedtls_ssl_write(&tls->ssl, (const unsigned char*)data, len);
-    if (ret < 0) {
-        if (ret == MBEDTLS_ERR_SSL_WANT_READ || ret == MBEDTLS_ERR_SSL_WANT_WRITE) {
+    int ret = SSL_write(tls->ssl, data, len);
+    if (ret <= 0) {
+        int err = SSL_get_error(tls->ssl, ret);
+        if (err == SSL_ERROR_WANT_READ || err == SSL_ERROR_WANT_WRITE) {
            return -1; // Would block
        }
        return -1;
@@ -618,28 +576,34 @@ static int tls_send(void* ctx, const void* data, size_t len) {

 static int tls_recv(void* ctx, void* data, size_t len, int timeout_ms) {
    tls_transport_t* tls = (tls_transport_t*)ctx;
-    if (!tls->ssl_connected) {
+    if (!tls->ssl_connected || !tls->ssl) {
        return -1;
    }
    
-    // Check if mbedTLS has pending data first - this avoids unnecessary select() calls
-    size_t pending = mbedtls_ssl_get_bytes_avail(&tls->ssl);
-    if (pending == 0 && timeout_ms > 0) {
-        // Only use select() if no data is pending in SSL buffers
+    // Always use select() to ensure proper blocking behavior
+    // If SSL has pending data, use zero timeout to return immediately
+    // Otherwise use the full timeout to block until data arrives
+    if (timeout_ms > 0) {
        fd_set readfds;
        struct timeval tv;
        
        FD_ZERO(&readfds);
        FD_SET(tls->socket_fd, &readfds);
        
-        tv.tv_sec = timeout_ms / 1000;
-        tv.tv_usec = (timeout_ms % 1000) * 1000;
+        // If SSL has buffered data, use zero timeout; otherwise use full timeout
+        if (SSL_pending(tls->ssl) > 0) {
+            tv.tv_sec = 0;
+            tv.tv_usec = 0;
+        } else {
+            tv.tv_sec = timeout_ms / 1000;
+            tv.tv_usec = (timeout_ms % 1000) * 1000;
+        }
        
        int result = select(tls->socket_fd + 1, &readfds, NULL, NULL, &tv);
        if (result < 0) {
            return -1;
-        } else if (result == 0) {
-            return -1; // Timeout
+        } else if (result == 0 && SSL_pending(tls->ssl) == 0) {
+            return -1; // Timeout with no pending data
        }
    }
    
@@ -648,13 +612,15 @@ static int tls_recv(void* ctx, void* data, size_t len, int timeout_ms) {
    const int max_attempts = 10;
    
    while (attempts < max_attempts) {
-        int ret = mbedtls_ssl_read(&tls->ssl, (unsigned char*)data, len);
+        int ret = SSL_read(tls->ssl, data, len);
        
-        if (ret >= 0) {
-            return ret; // Success or clean close
+        if (ret > 0) {
+            return ret; // Success
        }
        
-        if (ret == MBEDTLS_ERR_SSL_WANT_READ) {
+        int err = SSL_get_error(tls->ssl, ret);
+        
+        if (err == SSL_ERROR_WANT_READ) {
            // Check if more data is available on socket
            fd_set readfds;
            struct timeval tv = {0, 100000}; // 100ms timeout
@@ -670,16 +636,12 @@ static int tls_recv(void* ctx, void* data, size_t len, int timeout_ms) {
            attempts++;
            continue; // Retry the SSL read
            
-        } else if (ret == MBEDTLS_ERR_SSL_WANT_WRITE) {
+        } else if (err == SSL_ERROR_WANT_WRITE) {
            return -1;
            
-        } else if (ret == MBEDTLS_ERR_SSL_PEER_CLOSE_NOTIFY) {
+        } else if (err == SSL_ERROR_ZERO_RETURN) {
            return 0; // Clean close
            
-        } else if (ret == -0x7b00) { // MBEDTLS_ERR_SSL_RECEIVED_NEW_SESSION_TICKET
-            attempts++;
-            continue; // This is normal, keep trying to read application data
-            
        } else {
            return -1;
        }
@@ -690,8 +652,8 @@ static int tls_recv(void* ctx, void* data, size_t len, int timeout_ms) {
 static int tls_close(void* ctx) {
    tls_transport_t* tls = (tls_transport_t*)ctx;
    
-    if (tls->ssl_connected) {
-        mbedtls_ssl_close_notify(&tls->ssl);
+    if (tls->ssl_connected && tls->ssl) {
+        SSL_shutdown(tls->ssl);
        tls->ssl_connected = 0;
    }
    
@@ -708,10 +670,15 @@ static void tls_cleanup(void* ctx) {
    
    tls_close(ctx);
    
-    mbedtls_ssl_free(&tls->ssl);
-    mbedtls_ssl_config_free(&tls->conf);
-    mbedtls_ctr_drbg_free(&tls->ctr_drbg);
-    mbedtls_entropy_free(&tls->entropy);
+    if (tls->ssl) {
+        SSL_free(tls->ssl);
+        tls->ssl = NULL;
+    }
+    
+    if (tls->ssl_ctx) {
+        SSL_CTX_free(tls->ssl_ctx);
+        tls->ssl_ctx = NULL;
+    }
 }

 // ============================================================================
@@ -765,10 +732,13 @@ static int ws_parse_url(const char* url, char** host, int* port, char** path, in
 static int ws_create_handshake_key(char* key_out, size_t key_size) {
    if (key_size < WS_KEY_LEN + 1) return -1;
    
-    // Generate random 16 bytes
+    // Generate random 16 bytes using OpenSSL
    unsigned char random_bytes[16];
-    for (int i = 0; i < 16; i++) {
-        random_bytes[i] = rand() & 0xFF;
+    if (RAND_bytes(random_bytes, 16) != 1) {
+        // Fallback to basic rand if OpenSSL fails
+        for (int i = 0; i < 16; i++) {
+            random_bytes[i] = rand() & 0xFF;
+        }
    }
    
    // Base64 encode
@@ -818,32 +788,35 @@ static int ws_perform_handshake(nostr_ws_client_t* client, const char* key) {
    // Read response
    char response[MAX_HEADER_SIZE];
    int total_received = 0;
-    
+
    while ((size_t)total_received < sizeof(response) - 1) {
-        int received = client->transport->recv(&client->transport_ctx, 
-                                             response + total_received, 
-                                             sizeof(response) - total_received - 1, 
-                                             client->timeout_ms);
+        int received = client->transport->recv(&client->transport_ctx,
+                                              response + total_received,
+                                              sizeof(response) - total_received - 1,
+                                              client->timeout_ms);
        if (received <= 0) {
            return -1;
        }
-        
+
        total_received += received;
        response[total_received] = '\0';
-        
+
        // Check if we have complete headers
-        if (strstr(response, "\r\n\r\n")) break;
+        if (strstr(response, "\r\n\r\n")) {
+            break;
+        }
    }
    
    // Check if response starts with the correct HTTP status line
    if (strncmp(response, "HTTP/1.1 101 Switching Protocols\r\n", 34) != 0) {
        return -1;
    }
-    
-    if (!strstr(response, "Upgrade: websocket") && !strstr(response, "upgrade: websocket")) {
+
+    if (!strstr(response, "Upgrade: websocket") && !strstr(response, "upgrade: websocket") &&
+        !strstr(response, "Upgrade: WebSocket") && !strstr(response, "upgrade: WebSocket")) {
        return -1;
    }
-    
+
    return 0;
 }

@@ -887,10 +860,15 @@ static int ws_send_frame(nostr_ws_client_t* client, ws_opcode_t opcode, const ch
        frame_len += payload_len;
    }
    
-    // Log outgoing message to debug.log
-#if defined(ENABLE_FILE_LOGGING) && defined(ENABLE_WEBSOCKET_LOGGING)
+    // Emit outgoing message to consumer callback logger
+#if defined(ENABLE_WEBSOCKET_LOGGING)
    if (opcode == WS_OPCODE_TEXT && payload && payload_len > 0) {
-        debug_log_message("SEND", client->host, client->port, payload);
+        nostr_log_emitf(NOSTR_LOG_LEVEL_TRACE,
+                        "websocket",
+                        "SEND %s:%d: %s",
+                        client->host ? client->host : "",
+                        client->port,
+                        payload);
    }
 #endif
    
@@ -935,11 +913,6 @@ static int ws_receive_frame(nostr_ws_client_t* client, ws_opcode_t* opcode, char
        header_len = 10;
    }
    
-    // Check payload length
-    if (len > *payload_len) {
-        return -1;
-    }
-    
    // Read mask (if present)
    uint32_t mask = 0;
    if (masked) {
@@ -952,6 +925,21 @@ static int ws_receive_frame(nostr_ws_client_t* client, ws_opcode_t* opcode, char
               header[header_len + 3];
        header_len += 4;
    }
+
+    // Check payload length; if too large for caller buffer, drain frame to keep stream aligned
+    if (len > *payload_len) {
+        char discard[1024];
+        uint64_t remaining = len;
+        while (remaining > 0) {
+            size_t chunk = remaining > sizeof(discard) ? sizeof(discard) : (size_t)remaining;
+            int got = client->transport->recv(&client->transport_ctx, discard, chunk, timeout_ms);
+            if (got <= 0) {
+                return -1;
+            }
+            remaining -= (uint64_t)got;
+        }
+        return -1;
+    }
    
    // Read payload
    if (len > 0) {
@@ -970,14 +958,19 @@ static int ws_receive_frame(nostr_ws_client_t* client, ws_opcode_t* opcode, char
            ws_mask_payload(payload, len, mask);
        }
        
-        // Log incoming text messages to debug.log
-#if defined(ENABLE_FILE_LOGGING) && defined(ENABLE_WEBSOCKET_LOGGING)
+        // Emit incoming text messages to consumer callback logger
+#if defined(ENABLE_WEBSOCKET_LOGGING)
        if (*opcode == WS_OPCODE_TEXT && len > 0) {
            // Null terminate for logging
            char temp_payload[len + 1];
            memcpy(temp_payload, payload, len);
            temp_payload[len] = '\0';
-            debug_log_message("RECV", client->host, client->port, temp_payload);
+            nostr_log_emitf(NOSTR_LOG_LEVEL_TRACE,
+                            "websocket",
+                            "RECV %s:%d: %s",
+                            client->host ? client->host : "",
+                            client->port,
+                            temp_payload);
        }
 #endif
    }
@@ -1000,47 +993,11 @@ static void ws_mask_payload(char* payload, size_t len, uint32_t mask) {
 }

 static uint32_t ws_generate_mask(void) {
+    uint32_t mask;
+    if (RAND_bytes((unsigned char*)&mask, sizeof(mask)) == 1) {
+        return mask;
+    }
+    // Fallback to basic rand if OpenSSL fails
    return ((uint32_t)rand() << 16) | ((uint32_t)rand() & 0xFFFF);
 }

-// ============================================================================
-// Debug Logging Functions
-// ============================================================================
-
-#if defined(ENABLE_FILE_LOGGING) && defined(ENABLE_WEBSOCKET_LOGGING)
-static void debug_log_init(void) {
-    if (!debug_log_file) {
-        debug_log_file = fopen("debug.log", "a");
-        if (debug_log_file) {
-            fprintf(debug_log_file, "\n=== NOSTR WebSocket Debug Log Started ===\n");
-            fflush(debug_log_file);
-        }
-    }
-}
-
-
-static const char* get_timestamp(void) {
-    static char timestamp[32];
-    struct timespec ts;
-    struct tm *timeinfo;
-    
-    clock_gettime(CLOCK_REALTIME, &ts);
-    timeinfo = localtime(&ts.tv_sec);
-    
-    // Format: HH:MM:SS.mmm (with milliseconds)
-    strftime(timestamp, sizeof(timestamp), "%H:%M:%S", timeinfo);
-    snprintf(timestamp + 8, sizeof(timestamp) - 8, ".%03ld", ts.tv_nsec / 1000000);
-    
-    return timestamp;
-}
-
-static void debug_log_message(const char* direction, const char* host, int port, const char* message) {
-    debug_log_init();
-    
-    if (debug_log_file) {
-        fprintf(debug_log_file, "[%s] %s %s:%d: %s\n", 
-                get_timestamp(), direction, host, port, message);
-        fflush(debug_log_file);
-    }
-}
-#endif
@@ -13,7 +13,7 @@
  "keywords": [],
  "author": "",
  "license": "ISC",
-  "type": "commonjs",
+  "type": "module",
  "dependencies": {
    "nostr-tools": "^2.16.1"
  }
@@ -0,0 +1,148 @@
+# Logging Delegation Plan for `nostr_core_lib`
+
+## Objective
+
+Refactor `nostr_core_lib` so it does not own log destinations such as `debug.log`, and instead emits logs through a consumer-provided callback. This allows host applications such as [`didactyl`](../README.md) to route all library logs into their own logging system with consistent formatting, level control, and file policy.
+
+## Current State and Problem
+
+The library currently writes directly to `debug.log` in multiple places:
+
+- [`nostr_core_lib/nostr_websocket/nostr_websocket_openssl.c`](../nostr_websocket/nostr_websocket_openssl.c:1008)
+- [`nostr_core_lib/nostr_core/nip013.c`](../nostr_core/nip013.c:178)
+- [`nostr_core_lib/nostr_core/nip013.c`](../nostr_core/nip013.c:242)
+- [`nostr_core_lib/nostr_core/nip013.c`](../nostr_core/nip013.c:270)
+
+This creates collisions with consumer logs when the host app also uses `debug.log` such as [`didactyl/src/debug.c`](../../src/debug.c:18).
+
+## Target Design
+
+Adopt a callback-based logging API inside `nostr_core_lib`:
+
+1. Library owns no file handle for logs.
+2. Library emits structured log events by level and source.
+3. Consumer registers a callback once during startup.
+4. If no callback is set, logs are dropped by default.
+
+### High-Level Flow
+
+```mermaid
+flowchart TD
+    A[nostr_core_lib internal code] --> B[nostr_log_emit level source message]
+    B --> C{callback configured}
+    C -->|Yes| D[consumer callback]
+    C -->|No| E[drop log event]
+    D --> F[didactyl debug_log routing]
+    F --> G[didactyl log file or stdout]
+```
+
+## API Additions
+
+Add a small public logging API in [`nostr_core_lib/nostr_core/nostr_core.h`](../nostr_core/nostr_core.h):
+
+- `nostr_log_level_t` enum with levels compatible with host systems
+- `nostr_log_callback_t` callback type
+- `void nostr_set_log_callback(nostr_log_callback_t cb, void* user_data);`
+- `void nostr_set_log_level(nostr_log_level_t min_level);`
+
+Recommended callback shape:
+
+```c
+typedef void (*nostr_log_callback_t)(
+    int level,
+    const char* component,
+    const char* message,
+    void* user_data
+);
+```
+
+Notes:
+- Keep ABI simple by formatting message inside the library before callback invocation.
+- Include `component` values such as `websocket` and `nip013`.
+
+## Internal Implementation Plan
+
+## Phase 1: Logging Core
+
+1. Create `nostr_core_lib/nostr_core/nostr_log.h` and `nostr_core_lib/nostr_core/nostr_log.c`.
+2. Add internal singleton state:
+   - callback pointer
+   - callback user data
+   - minimum log level
+3. Add internal helpers:
+   - `nostr_log_emitf level component fmt ...`
+   - stack buffer formatting with truncation safety
+4. Default behavior when no callback set: no-op.
+
+## Phase 2: Replace File Logging in WebSocket Layer
+
+1. Remove file-specific static globals from [`nostr_websocket_openssl.c`](../nostr_websocket/nostr_websocket_openssl.c:27).
+2. Remove `debug_log_init` and `debug_log_message` path at [`nostr_websocket_openssl.c`](../nostr_websocket/nostr_websocket_openssl.c:1005).
+3. Replace call sites:
+   - outgoing frame logging near [`nostr_websocket_openssl.c`](../nostr_websocket/nostr_websocket_openssl.c:871)
+   - incoming frame logging near [`nostr_websocket_openssl.c`](../nostr_websocket/nostr_websocket_openssl.c:964)
+4. Emit through `nostr_log_emitf` with component `websocket`.
+
+## Phase 3: Replace File Logging in NIP-13
+
+1. Replace `fopen`/`fprintf` blocks in [`nip013.c`](../nostr_core/nip013.c:178), [`nip013.c`](../nostr_core/nip013.c:242), and [`nip013.c`](../nostr_core/nip013.c:270).
+2. Emit equivalent debug lines via `nostr_log_emitf` with component `nip013`.
+3. Preserve existing compile-time verbosity guards if needed, but route output through callback.
+
+## Phase 4: Wire Public API
+
+1. Export new functions in [`nostr_core.h`](../nostr_core/nostr_core.h:1).
+2. Ensure object file inclusion in `nostr_core_lib` build scripts and static archive.
+3. Document behavior in [`nostr_core_lib/README.md`](../README.md).
+
+## Phase 5: Consumer Integration in Didactyl
+
+1. In didactyl initialization path near [`src/nostr_handler.c`](../../src/nostr_handler.c:1519), register `nostr_set_log_callback`.
+2. Adapter callback maps library levels to didactyl levels from [`src/debug.h`](../../src/debug.h:7).
+3. Prefix messages with source namespace such as `[nostr:websocket]` and `[nostr:nip013]`.
+
+## Backward Compatibility Strategy
+
+- Keep existing compile guards but change behavior from file output to callback emission.
+- If callback not set, behavior remains safe and silent.
+- No breaking changes for consumers not using logging.
+
+## Testing Plan
+
+### Unit Tests in `nostr_core_lib`
+
+1. Add tests for callback registration and null behavior.
+2. Add tests for level filtering.
+3. Add tests that message formatting truncates safely and remains null terminated.
+
+### Integration Checks in Didactyl
+
+1. Start didactyl with debug enabled and callback wired.
+2. Verify websocket SEND and RECV lines appear through didactyl logger format from [`src/debug.c`](../../src/debug.c:31).
+3. Verify no separate websocket-only banner line from old path near [`nostr_websocket_openssl.c`](../nostr_websocket/nostr_websocket_openssl.c:1010).
+4. Verify LLM request log lines and nostr logs coexist in one log destination.
+
+## Rollout Steps
+
+1. Implement callback infrastructure and migrate websocket logging first.
+2. Validate no direct file writes remain in websocket module.
+3. Migrate nip013 logging.
+4. Add documentation and examples.
+5. Update didactyl wiring.
+6. Remove obsolete references to `ENABLE_FILE_LOGGING` for websocket logging behavior if no longer needed.
+
+## Risks and Mitigations
+
+- Risk: excessive callback volume from websocket trace traffic.
+  - Mitigation: implement minimum level filter in library and map websocket traffic to trace level.
+- Risk: callback reentrancy or thread concerns.
+  - Mitigation: document callback must be fast and thread-safe, avoid heavy blocking in callback.
+- Risk: API drift across consumers.
+  - Mitigation: keep callback signature minimal and stable.
+
+## Definition of Done
+
+- No direct `fopen("debug.log", ...)` remains in production logging paths in `nostr_core_lib`.
+- Consumer can set callback and receive websocket and nip013 logs.
+- Didactyl routes nostr_core_lib logs through its logger and single configured destination.
+- Documentation updated with migration and usage examples.
@@ -0,0 +1,209 @@
+# NIP-42 Authentication Support for core_relay_pool.c
+
+## Problem Statement
+
+The relay pool ([`core_relay_pool.c`](nostr_core/core_relay_pool.c)) does not handle NIP-42 authentication. When a relay sends an `AUTH` challenge message, the pool silently ignores it, causing:
+
+- Subscriptions to fail on auth-required relays (events never delivered)
+- Publishes to be rejected with `auth-required:` errors
+- No visibility into authentication state per relay
+
+The synchronous relay functions in [`core_relays.c`](nostr_core/core_relays.c) already have full NIP-42 support (lines 58-63, 211-239, 595-624). The NIP-42 primitives in [`nip042.c`](nostr_core/nip042.c) / [`nip042.h`](nostr_core/nip042.h) are production-ready. This plan wires them into the pool.
+
+## Architecture Overview
+
+```mermaid
+flowchart TD
+    A[Relay sends AUTH challenge] --> B[process_relay_message parses AUTH]
+    B --> C{pool has private_key?}
+    C -->|No| D[Log warning, mark relay auth_state = CHALLENGE_RECEIVED]
+    C -->|Yes| E[nostr_nip42_create_auth_event]
+    E --> F[nostr_nip42_create_auth_message]
+    F --> G[nostr_ws_send_text to relay]
+    G --> H[Mark relay auth_state = AUTHENTICATING]
+    H --> I[Relay sends OK for auth event]
+    I --> J[Mark relay auth_state = AUTHENTICATED]
+    
+    K[Relay sends OK with auth-required] --> L[process_relay_message detects prefix]
+    L --> M{relay already authenticated?}
+    M -->|No| N[Trigger auth flow if private_key available]
+    M -->|Yes| O[Surface as publish failure]
+    
+    P[Relay sends NOTICE] --> Q{Contains auth-required?}
+    Q -->|Yes| R[Log auth-required notice]
+    Q -->|No| S[Ignore or log]
+```
+
+## Detailed Changes
+
+### 1. Add NIP-42 include to core_relay_pool.c
+
+Add `#include "nip042.h"` alongside the existing includes at the top of [`core_relay_pool.c`](nostr_core/core_relay_pool.c:27).
+
+### 2. Add auth fields to `relay_connection_t` struct
+
+Modeled after [`core_relays.c:58-63`](nostr_core/core_relays.c:58), add to the [`relay_connection_t`](nostr_core/core_relay_pool.c:76) struct:
+
+```c
+// NIP-42 Authentication fields
+nostr_auth_state_t auth_state;
+char auth_challenge[NOSTR_NIP42_MAX_CHALLENGE_LENGTH];
+time_t auth_challenge_time;
+int nip42_enabled;
+```
+
+These go after the existing `last_connection_error_time` field (around line 106).
+
+### 3. Add private key and NIP-42 config to `nostr_relay_pool` struct
+
+Add to the [`nostr_relay_pool`](nostr_core/core_relay_pool.c:146) struct:
+
+```c
+// NIP-42 Authentication configuration
+int nip42_enabled;
+unsigned char private_key[32];
+int has_private_key;
+```
+
+### 4. Add public API: `nostr_relay_pool_set_auth()`
+
+Add to [`nostr_core.h`](nostr_core/nostr_core.h) after the existing pool management functions (around line 252):
+
+```c
+// NIP-42 Authentication configuration for relay pool
+int nostr_relay_pool_set_auth(nostr_relay_pool_t* pool, 
+                               const unsigned char* private_key,
+                               int enable);
+```
+
+Implement in [`core_relay_pool.c`](nostr_core/core_relay_pool.c):
+- Copies the 32-byte private key into the pool struct
+- Sets `nip42_enabled` flag
+- Propagates `nip42_enabled` to all existing relay connections
+
+### 5. Handle AUTH in `process_relay_message()`
+
+Add an `AUTH` handler in [`process_relay_message()`](nostr_core/core_relay_pool.c:912) between the existing `OK` and `PONG` handlers (around line 1097). The logic mirrors [`core_relays.c:211-239`](nostr_core/core_relays.c:211):
+
+```c
+} else if (strcmp(msg_type, "AUTH") == 0) {
+    // Handle AUTH challenge: ["AUTH", <challenge-string>]
+    if (pool->nip42_enabled && pool->has_private_key && 
+        cJSON_IsArray(parsed) && cJSON_GetArraySize(parsed) >= 2) {
+        cJSON* challenge_json = cJSON_GetArrayItem(parsed, 1);
+        if (cJSON_IsString(challenge_json)) {
+            const char* challenge = cJSON_GetStringValue(challenge_json);
+            
+            // Store challenge
+            strncpy(relay->auth_challenge, challenge, 
+                    sizeof(relay->auth_challenge) - 1);
+            relay->auth_challenge[sizeof(relay->auth_challenge) - 1] = '\0';
+            relay->auth_challenge_time = time(NULL);
+            relay->auth_state = NOSTR_AUTH_STATE_CHALLENGE_RECEIVED;
+            
+            // Create and send auth event
+            cJSON* auth_event = nostr_nip42_create_auth_event(
+                challenge, relay->url, pool->private_key, 0);
+            if (auth_event) {
+                char* auth_message = nostr_nip42_create_auth_message(auth_event);
+                if (auth_message) {
+                    if (nostr_ws_send_text(relay->ws_client, auth_message) >= 0) {
+                        relay->auth_state = NOSTR_AUTH_STATE_AUTHENTICATING;
+                    }
+                    free(auth_message);
+                }
+                cJSON_Delete(auth_event);
+            }
+        }
+    }
+}
+```
+
+### 6. Handle AUTH in `nostr_relay_pool_query_sync()` inline loop
+
+The [`nostr_relay_pool_query_sync()`](nostr_core/core_relay_pool.c:1107) function has its own inline message parsing loop (lines 1178-1227) that bypasses `process_relay_message()`. Add AUTH handling there too, similar to the pattern above.
+
+### 7. Handle NOTICE messages
+
+Add a `NOTICE` handler in [`process_relay_message()`](nostr_core/core_relay_pool.c:912):
+
+```c
+} else if (strcmp(msg_type, "NOTICE") == 0) {
+    // Handle NOTICE: ["NOTICE", <message>]
+    if (cJSON_IsArray(parsed) && cJSON_GetArraySize(parsed) >= 2) {
+        cJSON* notice_msg = cJSON_GetArrayItem(parsed, 1);
+        if (cJSON_IsString(notice_msg)) {
+            const char* notice = cJSON_GetStringValue(notice_msg);
+            // Detect auth-required notices
+            if (strstr(notice, "auth-required") != NULL) {
+                relay->auth_state = NOSTR_AUTH_STATE_NONE; // Reset for re-auth
+            }
+        }
+    }
+}
+```
+
+### 8. Handle OK auth-required rejections
+
+Enhance the existing [`OK` handler](nostr_core/core_relay_pool.c:1048) to detect `auth-required:` prefix in error messages. When detected:
+- If the pool has a private key and the relay hasn't been authenticated yet, trigger the auth flow
+- Surface the rejection through the publish callback with the auth-required message
+
+### 9. Initialize auth fields in `nostr_relay_pool_add_relay()`
+
+In [`nostr_relay_pool_add_relay()`](nostr_core/core_relay_pool.c:605), initialize the new auth fields:
+
+```c
+// Initialize NIP-42 authentication fields
+relay->auth_state = NOSTR_AUTH_STATE_NONE;
+memset(relay->auth_challenge, 0, sizeof(relay->auth_challenge));
+relay->auth_challenge_time = 0;
+relay->nip42_enabled = pool->nip42_enabled;
+```
+
+### 10. Secure cleanup in `nostr_relay_pool_destroy()`
+
+In [`nostr_relay_pool_destroy()`](nostr_core/core_relay_pool.c:684), zero the private key before freeing:
+
+```c
+// Securely zero private key
+if (pool->has_private_key) {
+    memset(pool->private_key, 0, sizeof(pool->private_key));
+    pool->has_private_key = 0;
+}
+```
+
+### 11. Test file
+
+Create `tests/nip42_pool_test.c` that:
+- Creates a pool with auth configured
+- Verifies `nostr_relay_pool_set_auth()` stores the key
+- Simulates AUTH challenge parsing logic (unit-level, no live relay needed)
+- Verifies auth event creation with the pool's private key
+
+### 12. Documentation updates
+
+- Update [`POOL_API.md`](POOL_API.md) with `nostr_relay_pool_set_auth()` documentation
+- Update [`README.md`](README.md) with a relay pool NIP-42 usage example
+
+## Files Modified
+
+| File | Change Type | Description |
+|------|-------------|-------------|
+| [`nostr_core/core_relay_pool.c`](nostr_core/core_relay_pool.c) | Modified | Add auth fields, AUTH/NOTICE handlers, auth config API |
+| [`nostr_core/nostr_core.h`](nostr_core/nostr_core.h) | Modified | Add `nostr_relay_pool_set_auth()` declaration |
+| [`tests/nip42_pool_test.c`](tests/nip42_pool_test.c) | New | NIP-42 pool authentication tests |
+| [`POOL_API.md`](POOL_API.md) | Modified | Document new auth API |
+| [`README.md`](README.md) | Modified | Add pool auth usage example |
+
+## Key Design Decisions
+
+1. **Private key stored in pool, not per-relay**: A single identity authenticates to all relays in the pool. This matches the common use case and mirrors how `core_relays.c` accepts a single `private_key` parameter.
+
+2. **Auth state tracked per-relay**: Each relay connection tracks its own `nostr_auth_state_t` since different relays may challenge at different times.
+
+3. **Automatic re-auth on reconnect**: When a relay reconnects (via the existing reconnection logic), the auth state resets to `NOSTR_AUTH_STATE_NONE`, allowing the relay to re-challenge.
+
+4. **No blocking on auth**: The AUTH response is sent asynchronously. If a relay requires auth before accepting subscriptions, the relay will re-send events after authentication succeeds. The pool does not block waiting for auth confirmation.
+
+5. **Reuse existing NIP-42 primitives**: All crypto and message formatting uses [`nostr_nip42_create_auth_event()`](nostr_core/nip042.c:26) and [`nostr_nip42_create_auth_message()`](nostr_core/nip042.c:84) — no new crypto code needed.
@@ -0,0 +1,350 @@
+# NIP-46 Remote Signing — Implementation Plan
+
+## Overview
+
+NIP-46 defines a protocol for **Nostr Remote Signing**, enabling 2-way communication between a client application and a remote signer (bunker) over Nostr relays. The remote signer holds the user's private keys and performs cryptographic operations on behalf of the client, reducing the attack surface by keeping keys off the client device.
+
+This plan covers implementing **both sides** of the protocol:
+- **Client-side**: sends requests to a remote signer and processes responses
+- **Remote-signer-side**: receives requests and produces responses (for building bunker applications)
+
+## Architecture
+
+### Protocol Flow
+
+```mermaid
+sequenceDiagram
+    participant C as Client
+    participant R as Relay
+    participant S as Remote Signer
+
+    Note over C: Generate client-keypair
+    C->>R: Subscribe to kind:24133 p-tagged to client-pubkey
+    C->>R: Publish connect request, kind:24133, p-tag remote-signer-pubkey
+    R->>S: Deliver connect request
+    S->>R: Publish connect response, kind:24133, p-tag client-pubkey
+    R->>C: Deliver connect response
+    Note over C: Connection established
+
+    C->>R: Publish get_public_key request
+    R->>S: Deliver request
+    S->>R: Publish response with user-pubkey
+    R->>C: Deliver response
+    Note over C: Now knows user-pubkey
+
+    C->>R: Publish sign_event request
+    R->>S: Deliver request
+    S->>R: Publish signed event response
+    R->>C: Deliver signed event
+```
+
+### Connection Initiation
+
+```mermaid
+flowchart TD
+    A[Connection Initiation] --> B{Who initiates?}
+    B -->|Remote Signer| C[bunker:// URL]
+    B -->|Client| D[nostrconnect:// URL]
+    
+    C --> E[Client parses bunker URL]
+    E --> F[Extract remote-signer-pubkey + relays + secret]
+    F --> G[Client sends connect request to remote-signer]
+    
+    D --> H[Remote signer parses nostrconnect URL]
+    H --> I[Extract client-pubkey + relays + secret + perms]
+    I --> J[Remote signer sends connect response to client]
+    
+    G --> K[Connection Established]
+    J --> K
+```
+
+### Component Dependency Map
+
+```mermaid
+graph TD
+    NIP46[nip046.c/h] --> NIP44[nip044 - NIP-44 Encryption]
+    NIP46 --> NIP04[nip004 - NIP-04 Encryption]
+    NIP46 --> NIP01[nip001 - Event Creation/Signing]
+    NIP46 --> POOL[core_relay_pool - Relay Communication]
+    NIP46 --> UTILS[utils - Hex/Bytes/Random]
+    NIP46 --> CJSON[cJSON - JSON Handling]
+    NIP46 --> COMMON[nostr_common - Error Codes/Constants]
+```
+
+## Data Structures
+
+### Core Types
+
+```c
+// NIP-46 event kind
+#define NOSTR_NIP46_REQUEST_KIND 24133
+
+// Connection types
+typedef enum {
+    NOSTR_NIP46_CONN_BUNKER,        // bunker:// initiated by remote-signer
+    NOSTR_NIP46_CONN_NOSTRCONNECT   // nostrconnect:// initiated by client
+} nostr_nip46_connection_type_t;
+
+// RPC Method types
+typedef enum {
+    NOSTR_NIP46_METHOD_CONNECT,
+    NOSTR_NIP46_METHOD_SIGN_EVENT,
+    NOSTR_NIP46_METHOD_PING,
+    NOSTR_NIP46_METHOD_GET_PUBLIC_KEY,
+    NOSTR_NIP46_METHOD_NIP04_ENCRYPT,
+    NOSTR_NIP46_METHOD_NIP04_DECRYPT,
+    NOSTR_NIP46_METHOD_NIP44_ENCRYPT,
+    NOSTR_NIP46_METHOD_NIP44_DECRYPT
+} nostr_nip46_method_t;
+
+// Parsed bunker:// URL
+typedef struct {
+    char remote_signer_pubkey[65];   // hex pubkey
+    char relays[8][256];             // up to 8 relay URLs
+    int relay_count;
+    char secret[128];                // optional secret
+} nostr_nip46_bunker_url_t;
+
+// Parsed nostrconnect:// URL
+typedef struct {
+    char client_pubkey[65];          // hex pubkey
+    char relays[8][256];             // relay URLs
+    int relay_count;
+    char secret[128];                // required secret
+    char perms[512];                 // optional permissions
+    char name[128];                  // optional app name
+    char url[256];                   // optional app URL
+    char image[256];                 // optional app image
+} nostr_nip46_nostrconnect_url_t;
+
+// JSON-RPC Request
+typedef struct {
+    char id[65];                     // random request ID
+    nostr_nip46_method_t method;
+    char method_str[32];             // string form of method
+    char** params;                   // array of string params
+    int param_count;
+} nostr_nip46_request_t;
+
+// JSON-RPC Response
+typedef struct {
+    char id[65];                     // matching request ID
+    char* result;                    // result string
+    char* error;                     // error string, NULL if success
+} nostr_nip46_response_t;
+
+// Client session state
+typedef struct {
+    unsigned char client_private_key[32];
+    char client_pubkey_hex[65];
+    char remote_signer_pubkey_hex[65];
+    unsigned char remote_signer_pubkey[32];
+    char user_pubkey_hex[65];        // learned via get_public_key
+    char relays[8][256];
+    int relay_count;
+    int connected;
+} nostr_nip46_client_session_t;
+
+// Signer session state
+typedef struct {
+    unsigned char signer_private_key[32];
+    char signer_pubkey_hex[65];
+    unsigned char user_private_key[32];
+    char user_pubkey_hex[65];
+    char client_pubkey_hex[65];
+    unsigned char client_pubkey[32];
+    char relays[8][256];
+    int relay_count;
+    int connected;
+} nostr_nip46_signer_session_t;
+```
+
+## Public API Functions
+
+### URL Parsing
+
+| Function | Description |
+|----------|-------------|
+| `nostr_nip46_parse_bunker_url()` | Parse `bunker://<pubkey>?relay=...&secret=...` |
+| `nostr_nip46_parse_nostrconnect_url()` | Parse `nostrconnect://<pubkey>?relay=...&secret=...&perms=...` |
+| `nostr_nip46_create_bunker_url()` | Generate a bunker:// connection token |
+| `nostr_nip46_create_nostrconnect_url()` | Generate a nostrconnect:// connection token |
+
+### JSON-RPC Message Construction
+
+| Function | Description |
+|----------|-------------|
+| `nostr_nip46_create_request()` | Build a JSON-RPC request object |
+| `nostr_nip46_create_response()` | Build a JSON-RPC response object |
+| `nostr_nip46_parse_request()` | Parse decrypted JSON into request struct |
+| `nostr_nip46_parse_response()` | Parse decrypted JSON into response struct |
+| `nostr_nip46_free_request()` | Free request struct memory |
+| `nostr_nip46_free_response()` | Free response struct memory |
+
+### Event Construction (kind: 24133)
+
+| Function | Description |
+|----------|-------------|
+| `nostr_nip46_create_request_event()` | Create NIP-44 encrypted kind:24133 request event |
+| `nostr_nip46_create_response_event()` | Create NIP-44 encrypted kind:24133 response event |
+| `nostr_nip46_decrypt_event()` | Decrypt a kind:24133 event content |
+
+### Client-Side Operations
+
+| Function | Description |
+|----------|-------------|
+| `nostr_nip46_client_session_init()` | Initialize client session from bunker URL |
+| `nostr_nip46_client_session_destroy()` | Clean up client session |
+| `nostr_nip46_client_connect()` | Send connect request to remote signer |
+| `nostr_nip46_client_get_public_key()` | Request user pubkey from remote signer |
+| `nostr_nip46_client_sign_event()` | Request event signing from remote signer |
+| `nostr_nip46_client_ping()` | Send ping to remote signer |
+| `nostr_nip46_client_nip04_encrypt()` | Request NIP-04 encryption |
+| `nostr_nip46_client_nip04_decrypt()` | Request NIP-04 decryption |
+| `nostr_nip46_client_nip44_encrypt()` | Request NIP-44 encryption |
+| `nostr_nip46_client_nip44_decrypt()` | Request NIP-44 decryption |
+
+### Remote-Signer-Side Operations
+
+| Function | Description |
+|----------|-------------|
+| `nostr_nip46_signer_session_init()` | Initialize signer session |
+| `nostr_nip46_signer_session_destroy()` | Clean up signer session |
+| `nostr_nip46_signer_handle_request()` | Process an incoming request and produce a response |
+| `nostr_nip46_signer_create_bunker_url()` | Generate bunker URL for distribution |
+
+### Utility
+
+| Function | Description |
+|----------|-------------|
+| `nostr_nip46_generate_request_id()` | Generate random request ID string |
+| `nostr_nip46_method_to_string()` | Convert method enum to string |
+| `nostr_nip46_string_to_method()` | Convert string to method enum |
+
+## Error Codes
+
+New error codes to add to `nostr_common.h`:
+
+```c
+// NIP-46 Remote Signing error codes
+#define NOSTR_ERROR_NIP46_INVALID_BUNKER_URL    -300
+#define NOSTR_ERROR_NIP46_INVALID_NOSTRCONNECT  -301
+#define NOSTR_ERROR_NIP46_INVALID_REQUEST       -302
+#define NOSTR_ERROR_NIP46_INVALID_RESPONSE      -303
+#define NOSTR_ERROR_NIP46_ENCRYPTION_FAILED     -304
+#define NOSTR_ERROR_NIP46_DECRYPTION_FAILED     -305
+#define NOSTR_ERROR_NIP46_CONNECTION_FAILED     -306
+#define NOSTR_ERROR_NIP46_TIMEOUT              -307
+#define NOSTR_ERROR_NIP46_SECRET_MISMATCH      -308
+#define NOSTR_ERROR_NIP46_UNKNOWN_METHOD       -309
+#define NOSTR_ERROR_NIP46_AUTH_CHALLENGE        -310
+#define NOSTR_ERROR_NIP46_NOT_CONNECTED        -311
+```
+
+## Files to Create/Modify
+
+### New Files
+
+| File | Purpose |
+|------|---------|
+| `nostr_core/nip046.h` | Header with all NIP-46 types, constants, and function declarations |
+| `nostr_core/nip046.c` | Implementation of all NIP-46 functions |
+| `tests/nip46_test.c` | Comprehensive test suite |
+| `examples/nip46_remote_signer.c` | Example showing both client and signer usage |
+
+### Modified Files
+
+| File | Change |
+|------|--------|
+| `nostr_core/nostr_core.h` | Add `#include "nip046.h"` and NIP-46 API docs in header comment |
+| `nostr_core/nostr_common.h` | Add NIP-46 error code defines |
+| `build.sh` | Add NIP-046 to auto-detection, `--nips=all` list, and description mapping |
+
+## Implementation Details
+
+### URL Parsing Strategy
+
+The `bunker://` and `nostrconnect://` URLs use standard URI format with query parameters. Implementation will:
+1. Validate the scheme prefix
+2. Extract the pubkey from the authority section
+3. Parse query parameters using simple string splitting — no external URL parsing library needed
+4. URL-decode relay values since they contain `://` characters
+
+### NIP-44 Encryption Integration
+
+All kind:24133 event content is NIP-44 encrypted. The implementation will use the existing `nostr_nip44_encrypt()` and `nostr_nip44_decrypt()` functions from `nip044.h`. The flow:
+1. Build JSON-RPC payload as a string
+2. Encrypt with `nostr_nip44_encrypt(client_privkey, remote_signer_pubkey, payload, ...)`
+3. Set as event content
+4. On receive: `nostr_nip44_decrypt(my_privkey, sender_pubkey, content, ...)`
+5. Parse decrypted JSON-RPC payload
+
+### Relay Communication
+
+For the initial implementation, the NIP-46 module will provide **event construction and parsing only** — it will not manage relay connections directly. Users will use the existing relay pool API to:
+1. Subscribe to kind:24133 events p-tagged to their pubkey
+2. Publish kind:24133 request/response events
+
+This keeps the module focused and composable, matching the pattern used by NIP-59 and NIP-17.
+
+A higher-level convenience layer could be added later that wraps the relay pool for a fully managed NIP-46 session.
+
+### Auth Challenge Handling
+
+When a response has `result: "auth_url"`, the error field contains a URL. The client-side API will return a specific error code `NOSTR_ERROR_NIP46_AUTH_CHALLENGE` and provide the URL in the response struct's error field, allowing the application to handle it appropriately.
+
+## Test Plan
+
+The test suite will cover:
+
+1. **URL Parsing Tests**
+   - Parse valid bunker:// URLs with single and multiple relays
+   - Parse valid nostrconnect:// URLs with all optional fields
+   - Reject malformed URLs
+   - Handle URL-encoded relay values
+
+2. **URL Generation Tests**
+   - Generate bunker:// URLs and verify round-trip parsing
+   - Generate nostrconnect:// URLs and verify round-trip parsing
+
+3. **JSON-RPC Message Tests**
+   - Create and parse each method type request
+   - Create and parse success responses
+   - Create and parse error responses
+   - Verify request ID matching
+
+4. **Event Construction Tests**
+   - Create kind:24133 request events with proper encryption
+   - Create kind:24133 response events with proper encryption
+   - Decrypt events and verify content matches
+
+5. **Method Enum Conversion Tests**
+   - Round-trip all method enum values through string conversion
+
+6. **Signer Request Handling Tests**
+   - Handle connect request and produce ack response
+   - Handle sign_event request and produce signed event response
+   - Handle ping request and produce pong response
+   - Handle get_public_key and return correct pubkey
+   - Handle NIP-04/NIP-44 encrypt/decrypt requests
+
+7. **End-to-End Flow Tests**
+   - Client creates connect request → Signer handles → Client processes response
+   - Client creates sign_event request → Signer signs → Client gets signed event
+   - Full bunker:// connection flow
+   - Secret validation on connect
+
+## Implementation Order
+
+1. Error codes in `nostr_common.h`
+2. Header file `nip046.h` with all declarations
+3. URL parsing functions
+4. JSON-RPC request/response construction and parsing
+5. Kind:24133 event creation and decryption
+6. Client session management
+7. Signer session and request handling
+8. Utility functions
+9. Build system updates
+10. Test suite
+11. Example program
+12. Documentation updates in `nostr_core.h`
@@ -0,0 +1,778 @@
+# NIP-60 Cashu Wallet & NIP-61 Nutzaps — Implementation Plan
+
+## Overview
+
+**NIP-60** defines a protocol for storing Cashu wallet state on Nostr relays, enabling cross-application wallet portability. The wallet stores unspent proofs as encrypted events, tracks spending history, and manages mint relationships.
+
+**NIP-61** defines "Nutzaps" — P2PK-locked Cashu tokens sent as zaps between Nostr users, where the payment itself serves as the receipt.
+
+This implementation covers:
+- **NIP-60**: Wallet event creation/parsing (kind:17375), token events (kind:7375), spending history (kind:7376), quote events (kind:7374)
+- **NIP-61**: Nutzap info events (kind:10019), nutzap events (kind:9321), nutzap redemption
+- **Cashu Mint HTTP Client**: Mint info, token swap, melt, and mint operations via curl
+
+## Architecture
+
+### Component Dependency Map
+
+```mermaid
+graph TD
+    NIP60[nip060.c/h - Cashu Wallet Events] --> NIP44[nip044 - NIP-44 Encryption]
+    NIP60 --> NIP01[nip001 - Event Creation/Signing]
+    NIP60 --> CJSON[cJSON - JSON Handling]
+    NIP60 --> UTILS[utils - Hex/Bytes/Base64]
+    NIP60 --> COMMON[nostr_common - Error Codes]
+
+    NIP61[nip061.c/h - Nutzaps] --> NIP44
+    NIP61 --> NIP01
+    NIP61 --> CJSON
+    NIP61 --> UTILS
+    NIP61 --> COMMON
+
+    CASHU[cashu_mint.c/h - Mint HTTP Client] --> CJSON
+    CASHU --> CURL[libcurl - HTTP]
+    CASHU --> COMMON
+
+    NIP60 -.->|optional| CASHU
+    NIP61 -.->|optional| CASHU
+```
+
+### NIP-60 High-Level Flow
+
+```mermaid
+sequenceDiagram
+    participant App as Application
+    participant W as NIP-60 Wallet Lib
+    participant R as Relay
+    participant M as Cashu Mint
+
+    Note over App: Initialize wallet
+    App->>W: nostr_nip60_create_wallet_event
+    W->>R: Publish kind:17375
+
+    Note over App: Receive tokens
+    App->>M: Mint tokens via cashu_mint_mint_tokens
+    M-->>App: Cashu proofs
+    App->>W: nostr_nip60_create_token_event
+    W->>R: Publish kind:7375
+
+    Note over App: Spend tokens
+    App->>W: nostr_nip60_spend_token
+    W->>M: Swap proofs via cashu_mint_swap
+    M-->>W: Change proofs
+    W->>R: Delete old kind:7375
+    W->>R: Publish new kind:7375 with change
+    W->>R: Publish kind:7376 history
+```
+
+### NIP-61 Nutzap Flow
+
+```mermaid
+sequenceDiagram
+    participant Alice as Alice - Sender
+    participant R as Relay
+    participant Bob as Bob - Recipient
+    participant M as Cashu Mint
+
+    Note over Bob: Setup
+    Bob->>R: Publish kind:10019 with mints + p2pk pubkey
+
+    Note over Alice: Send nutzap
+    Alice->>R: Fetch Bobs kind:10019
+    Alice->>M: Mint/swap P2PK-locked tokens
+    Alice->>R: Publish kind:9321 nutzap
+
+    Note over Bob: Receive nutzap
+    Bob->>R: Fetch kind:9321 events
+    Bob->>M: Swap P2PK tokens into wallet
+    Bob->>R: Publish kind:7376 redemption history
+```
+
+### Token State Transition
+
+```mermaid
+stateDiagram-v2
+    [*] --> Created: Mint/Receive tokens
+    Created --> Published: Publish kind 7375
+    Published --> Spending: Spend some proofs
+    Spending --> Deleted: NIP-09 delete old event
+    Spending --> RolledOver: New kind 7375 with unspent + change
+    RolledOver --> Published
+    Deleted --> [*]
+    Published --> Redeemed: All proofs spent
+    Redeemed --> Deleted
+```
+
+## File Structure
+
+```
+nostr_core/
+  nip060.h          # NIP-60 Cashu wallet types and function declarations
+  nip060.c          # NIP-60 implementation
+  nip061.h          # NIP-61 Nutzap types and function declarations
+  nip061.c          # NIP-61 implementation
+  cashu_mint.h      # Cashu mint HTTP client types and functions
+  cashu_mint.c      # Cashu mint HTTP client implementation
+tests/
+  nip60_test.c      # NIP-60 unit tests
+  nip61_test.c      # NIP-61 unit tests
+  cashu_mint_test.c # Cashu mint client tests
+examples/
+  cashu_wallet.c    # Complete wallet example
+```
+
+## Data Structures
+
+### NIP-60 Core Types
+
+```c
+// Event kinds
+#define NOSTR_NIP60_WALLET_KIND     17375
+#define NOSTR_NIP60_TOKEN_KIND      7375
+#define NOSTR_NIP60_HISTORY_KIND    7376
+#define NOSTR_NIP60_QUOTE_KIND      7374
+
+// A single Cashu proof
+typedef struct {
+    char id[17];           // Keyset ID, e.g. "005c2502034d4f12"
+    uint64_t amount;       // Denomination amount
+    char* secret;          // Proof secret (base64 or P2PK JSON)
+    char* C;               // Blinded signature (hex compressed point)
+} nostr_cashu_proof_t;
+
+// Token content - decrypted payload of kind:7375
+typedef struct {
+    char* mint_url;                    // Mint URL
+    nostr_cashu_proof_t* proofs;       // Array of proofs
+    int proof_count;                   // Number of proofs
+    char** deleted_token_ids;          // Event IDs of tokens destroyed
+    int deleted_count;                 // Number of deleted token IDs
+} nostr_nip60_token_data_t;
+
+// Wallet content - decrypted payload of kind:17375
+typedef struct {
+    char privkey[65];                  // Hex private key for P2PK
+    char** mint_urls;                  // Array of mint URLs
+    int mint_count;                    // Number of mints
+} nostr_nip60_wallet_data_t;
+
+// Spending history entry direction
+typedef enum {
+    NOSTR_NIP60_DIRECTION_IN,          // Received funds
+    NOSTR_NIP60_DIRECTION_OUT          // Sent funds
+} nostr_nip60_direction_t;
+
+// History event reference
+typedef enum {
+    NOSTR_NIP60_REF_CREATED,           // New token event created
+    NOSTR_NIP60_REF_DESTROYED,         // Token event destroyed
+    NOSTR_NIP60_REF_REDEEMED           // Nutzap redeemed
+} nostr_nip60_ref_marker_t;
+
+typedef struct {
+    char event_id[65];                 // Referenced event ID
+    char relay_hint[256];              // Optional relay hint
+    nostr_nip60_ref_marker_t marker;   // Reference type
+} nostr_nip60_history_ref_t;
+
+// Spending history data - decrypted payload of kind:7376
+typedef struct {
+    nostr_nip60_direction_t direction; // in or out
+    uint64_t amount;                   // Amount in sats
+    nostr_nip60_history_ref_t* refs;   // Event references
+    int ref_count;                     // Number of references
+} nostr_nip60_history_data_t;
+```
+
+### NIP-61 Core Types
+
+```c
+// Event kinds
+#define NOSTR_NIP61_NUTZAP_INFO_KIND  10019
+#define NOSTR_NIP61_NUTZAP_KIND       9321
+
+// Mint entry in kind:10019
+typedef struct {
+    char* url;                         // Mint URL
+    char** units;                      // Supported units, e.g. "sat", "usd"
+    int unit_count;                    // Number of units
+} nostr_nip61_mint_entry_t;
+
+// Nutzap info - parsed kind:10019
+typedef struct {
+    char** relay_urls;                 // Relays for receiving nutzaps
+    int relay_count;
+    nostr_nip61_mint_entry_t* mints;   // Trusted mints
+    int mint_count;
+    char pubkey[67];                   // P2PK pubkey (with 02 prefix)
+} nostr_nip61_nutzap_info_t;
+
+// Nutzap event data - parsed kind:9321
+typedef struct {
+    char* content;                     // Optional comment
+    nostr_cashu_proof_t* proofs;       // P2PK-locked proofs
+    int proof_count;
+    char* mint_url;                    // Mint URL
+    char recipient_pubkey[65];         // Recipient Nostr pubkey
+    char nutzapped_event_id[65];       // Event being nutzapped (optional)
+    char nutzapped_relay_hint[256];    // Relay hint for nutzapped event
+    int nutzapped_kind;                // Kind of nutzapped event
+} nostr_nip61_nutzap_data_t;
+```
+
+### Cashu Mint Client Types
+
+```c
+// Cashu protocol version
+#define CASHU_API_VERSION "v1"
+
+// Mint keyset
+typedef struct {
+    char id[17];                       // Keyset ID
+    char unit[8];                      // Unit, e.g. "sat"
+    int active;                        // Whether keyset is active
+    uint64_t* amounts;                 // Denomination amounts
+    char** pubkeys;                    // Corresponding public keys
+    int key_count;                     // Number of keys
+} cashu_keyset_t;
+
+// Mint info
+typedef struct {
+    char* name;
+    char* description;
+    char* version;
+    char** supported_nuts;             // NUT numbers supported
+    int nut_count;
+    cashu_keyset_t* keysets;
+    int keyset_count;
+} cashu_mint_info_t;
+
+// Mint quote (for minting new tokens)
+typedef struct {
+    char quote_id[128];
+    char payment_request[1024];        // Lightning invoice
+    int paid;
+    uint64_t amount;
+    time_t expiry;
+} cashu_mint_quote_t;
+
+// Melt quote (for paying Lightning invoices)
+typedef struct {
+    char quote_id[128];
+    uint64_t amount;
+    uint64_t fee_reserve;
+    int paid;
+    char* payment_preimage;
+    time_t expiry;
+} cashu_melt_quote_t;
+
+// Blind message for minting/swapping
+typedef struct {
+    uint64_t amount;
+    char* B_;                          // Blinded secret (hex)
+    char id[17];                       // Keyset ID
+} cashu_blinded_message_t;
+
+// Blind signature from mint
+typedef struct {
+    uint64_t amount;
+    char* C_;                          // Blinded signature (hex)
+    char id[17];                       // Keyset ID
+} cashu_blind_signature_t;
+```
+
+## API Functions
+
+### NIP-60 Wallet Functions
+
+```c
+// === Wallet Event (kind:17375) ===
+
+// Create a wallet event with encrypted content
+cJSON* nostr_nip60_create_wallet_event(
+    const nostr_nip60_wallet_data_t* wallet_data,
+    const unsigned char* private_key,
+    time_t timestamp);
+
+// Parse and decrypt a wallet event
+int nostr_nip60_parse_wallet_event(
+    cJSON* event,
+    const unsigned char* private_key,
+    nostr_nip60_wallet_data_t* wallet_data_out);
+
+// Free wallet data
+void nostr_nip60_free_wallet_data(nostr_nip60_wallet_data_t* data);
+
+// === Token Event (kind:7375) ===
+
+// Create a token event with encrypted proofs
+cJSON* nostr_nip60_create_token_event(
+    const nostr_nip60_token_data_t* token_data,
+    const unsigned char* private_key,
+    time_t timestamp);
+
+// Parse and decrypt a token event
+int nostr_nip60_parse_token_event(
+    cJSON* event,
+    const unsigned char* private_key,
+    nostr_nip60_token_data_t* token_data_out);
+
+// Free token data
+void nostr_nip60_free_token_data(nostr_nip60_token_data_t* data);
+
+// === Token Spending ===
+
+// Create a NIP-09 deletion event for a spent token
+cJSON* nostr_nip60_create_token_deletion(
+    const char* token_event_id,
+    const unsigned char* private_key,
+    time_t timestamp);
+
+// Create a rollover token event (unspent proofs + change from old token)
+cJSON* nostr_nip60_create_rollover_token(
+    const nostr_nip60_token_data_t* remaining_proofs,
+    const char** deleted_event_ids,
+    int deleted_count,
+    const unsigned char* private_key,
+    time_t timestamp);
+
+// === Spending History (kind:7376) ===
+
+// Create a spending history event
+cJSON* nostr_nip60_create_history_event(
+    const nostr_nip60_history_data_t* history_data,
+    const unsigned char* private_key,
+    time_t timestamp);
+
+// Parse and decrypt a spending history event
+int nostr_nip60_parse_history_event(
+    cJSON* event,
+    const unsigned char* private_key,
+    nostr_nip60_history_data_t* history_data_out);
+
+// Free history data
+void nostr_nip60_free_history_data(nostr_nip60_history_data_t* data);
+
+// === Quote Event (kind:7374) ===
+
+// Create a mint quote event
+cJSON* nostr_nip60_create_quote_event(
+    const char* quote_id,
+    const char* mint_url,
+    time_t expiration,
+    const unsigned char* private_key,
+    time_t timestamp);
+
+// Parse a quote event
+int nostr_nip60_parse_quote_event(
+    cJSON* event,
+    const unsigned char* private_key,
+    char* quote_id_out,
+    size_t quote_id_size,
+    char* mint_url_out,
+    size_t mint_url_size);
+
+// === Utility: Proof helpers ===
+
+// Calculate total amount from an array of proofs
+uint64_t nostr_nip60_sum_proofs(
+    const nostr_cashu_proof_t* proofs,
+    int proof_count);
+
+// Serialize proofs to JSON array
+cJSON* nostr_nip60_proofs_to_json(
+    const nostr_cashu_proof_t* proofs,
+    int proof_count);
+
+// Parse proofs from JSON array
+int nostr_nip60_proofs_from_json(
+    cJSON* json_array,
+    nostr_cashu_proof_t** proofs_out,
+    int* proof_count_out);
+
+// Free proof array
+void nostr_nip60_free_proofs(
+    nostr_cashu_proof_t* proofs,
+    int proof_count);
+
+// === Filter helpers ===
+
+// Create a filter to fetch wallet and token events
+cJSON* nostr_nip60_create_wallet_filter(const char* pubkey_hex);
+
+// Create a filter to fetch spending history
+cJSON* nostr_nip60_create_history_filter(const char* pubkey_hex, time_t since);
+```
+
+### NIP-61 Nutzap Functions
+
+```c
+// === Nutzap Info Event (kind:10019) ===
+
+// Create nutzap info event
+cJSON* nostr_nip61_create_nutzap_info_event(
+    const nostr_nip61_nutzap_info_t* info,
+    const unsigned char* private_key,
+    time_t timestamp);
+
+// Parse nutzap info event
+int nostr_nip61_parse_nutzap_info_event(
+    cJSON* event,
+    nostr_nip61_nutzap_info_t* info_out);
+
+// Free nutzap info
+void nostr_nip61_free_nutzap_info(nostr_nip61_nutzap_info_t* info);
+
+// === Nutzap Event (kind:9321) ===
+
+// Create a nutzap event
+cJSON* nostr_nip61_create_nutzap_event(
+    const nostr_nip61_nutzap_data_t* nutzap_data,
+    const unsigned char* sender_private_key,
+    time_t timestamp);
+
+// Parse a nutzap event
+int nostr_nip61_parse_nutzap_event(
+    cJSON* event,
+    nostr_nip61_nutzap_data_t* nutzap_data_out);
+
+// Free nutzap data
+void nostr_nip61_free_nutzap_data(nostr_nip61_nutzap_data_t* data);
+
+// === Nutzap Redemption ===
+
+// Create a redemption history event (kind:7376 with redeemed marker)
+cJSON* nostr_nip61_create_redemption_event(
+    const char* nutzap_event_id,
+    const char* nutzap_relay_hint,
+    const char* sender_pubkey,
+    const char* created_token_event_id,
+    const char* created_token_relay_hint,
+    uint64_t amount,
+    const unsigned char* private_key,
+    time_t timestamp);
+
+// === Nutzap Verification ===
+
+// Verify a nutzap against recipients kind:10019
+int nostr_nip61_verify_nutzap(
+    cJSON* nutzap_event,
+    cJSON* nutzap_info_event);
+
+// === Filter helpers ===
+
+// Create filter to fetch nutzap info for a user
+cJSON* nostr_nip61_create_nutzap_info_filter(const char* pubkey_hex);
+
+// Create filter to fetch incoming nutzaps
+cJSON* nostr_nip61_create_nutzap_filter(
+    const char* recipient_pubkey_hex,
+    const char** mint_urls,
+    int mint_count,
+    time_t since);
+```
+
+### Cashu Mint HTTP Client Functions
+
+```c
+// === Mint Connection ===
+
+// Get mint info
+int cashu_mint_get_info(
+    const char* mint_url,
+    cashu_mint_info_t* info_out,
+    int timeout_seconds);
+
+// Free mint info
+void cashu_mint_free_info(cashu_mint_info_t* info);
+
+// === Keysets ===
+
+// Get active keysets from mint
+int cashu_mint_get_keysets(
+    const char* mint_url,
+    cashu_keyset_t** keysets_out,
+    int* keyset_count_out,
+    int timeout_seconds);
+
+// Get specific keyset keys
+int cashu_mint_get_keys(
+    const char* mint_url,
+    const char* keyset_id,
+    cashu_keyset_t* keyset_out,
+    int timeout_seconds);
+
+// Free keysets
+void cashu_mint_free_keysets(cashu_keyset_t* keysets, int count);
+
+// === Minting (receiving Lightning) ===
+
+// Request a mint quote (get Lightning invoice)
+int cashu_mint_request_mint_quote(
+    const char* mint_url,
+    uint64_t amount,
+    const char* unit,
+    cashu_mint_quote_t* quote_out,
+    int timeout_seconds);
+
+// Check mint quote status
+int cashu_mint_check_mint_quote(
+    const char* mint_url,
+    const char* quote_id,
+    cashu_mint_quote_t* quote_out,
+    int timeout_seconds);
+
+// Mint tokens (after quote is paid)
+int cashu_mint_mint_tokens(
+    const char* mint_url,
+    const char* quote_id,
+    const cashu_blinded_message_t* blinded_messages,
+    int message_count,
+    cashu_blind_signature_t** signatures_out,
+    int* signature_count_out,
+    int timeout_seconds);
+
+// === Melting (paying Lightning) ===
+
+// Request a melt quote (estimate fee for paying invoice)
+int cashu_mint_request_melt_quote(
+    const char* mint_url,
+    const char* payment_request,
+    const char* unit,
+    cashu_melt_quote_t* quote_out,
+    int timeout_seconds);
+
+// Check melt quote status
+int cashu_mint_check_melt_quote(
+    const char* mint_url,
+    const char* quote_id,
+    cashu_melt_quote_t* quote_out,
+    int timeout_seconds);
+
+// Melt tokens (pay Lightning invoice)
+int cashu_mint_melt_tokens(
+    const char* mint_url,
+    const char* quote_id,
+    const nostr_cashu_proof_t* proofs,
+    int proof_count,
+    cashu_melt_quote_t* result_out,
+    cashu_blind_signature_t** change_out,
+    int* change_count_out,
+    int timeout_seconds);
+
+// === Swapping ===
+
+// Swap proofs (split/combine denominations)
+int cashu_mint_swap(
+    const char* mint_url,
+    const nostr_cashu_proof_t* inputs,
+    int input_count,
+    const cashu_blinded_message_t* outputs,
+    int output_count,
+    cashu_blind_signature_t** signatures_out,
+    int* signature_count_out,
+    int timeout_seconds);
+
+// === Token State ===
+
+// Check if proofs have been spent
+int cashu_mint_check_proofs_state(
+    const char* mint_url,
+    const nostr_cashu_proof_t* proofs,
+    int proof_count,
+    int* states_out,
+    int timeout_seconds);
+
+// === Crypto Helpers ===
+
+// Generate blinded messages for a target amount
+int cashu_create_blinded_messages(
+    uint64_t amount,
+    const char* keyset_id,
+    cashu_blinded_message_t** messages_out,
+    int* message_count_out,
+    char*** secrets_out,
+    char*** rs_out);
+
+// Unblind signatures to get proofs
+int cashu_unblind_signatures(
+    const cashu_blind_signature_t* signatures,
+    int signature_count,
+    const char** secrets,
+    const char** rs,
+    const cashu_keyset_t* keyset,
+    nostr_cashu_proof_t** proofs_out,
+    int* proof_count_out);
+
+// Create P2PK-locked blinded messages
+int cashu_create_p2pk_blinded_messages(
+    uint64_t amount,
+    const char* keyset_id,
+    const char* recipient_pubkey_hex,
+    cashu_blinded_message_t** messages_out,
+    int* message_count_out,
+    char*** secrets_out,
+    char*** rs_out);
+
+// Free blinded messages
+void cashu_free_blinded_messages(cashu_blinded_message_t* messages, int count);
+
+// Free blind signatures
+void cashu_free_blind_signatures(cashu_blind_signature_t* signatures, int count);
+```
+
+## Error Codes
+
+New error codes to add to `nostr_common.h`:
+
+```c
+// NIP-60 Cashu Wallet error codes
+#define NOSTR_ERROR_NIP60_INVALID_WALLET     -400
+#define NOSTR_ERROR_NIP60_INVALID_TOKEN      -401
+#define NOSTR_ERROR_NIP60_INVALID_HISTORY    -402
+#define NOSTR_ERROR_NIP60_INVALID_QUOTE      -403
+#define NOSTR_ERROR_NIP60_DECRYPT_FAILED     -404
+#define NOSTR_ERROR_NIP60_INVALID_PROOFS     -405
+#define NOSTR_ERROR_NIP60_INSUFFICIENT_FUNDS -406
+
+// NIP-61 Nutzap error codes
+#define NOSTR_ERROR_NIP61_INVALID_INFO       -410
+#define NOSTR_ERROR_NIP61_INVALID_NUTZAP     -411
+#define NOSTR_ERROR_NIP61_MINT_MISMATCH      -412
+#define NOSTR_ERROR_NIP61_PUBKEY_MISMATCH    -413
+#define NOSTR_ERROR_NIP61_VERIFICATION_FAILED -414
+
+// Cashu Mint client error codes
+#define NOSTR_ERROR_CASHU_HTTP_FAILED        -420
+#define NOSTR_ERROR_CASHU_JSON_PARSE_FAILED  -421
+#define NOSTR_ERROR_CASHU_MINT_ERROR         -422
+#define NOSTR_ERROR_CASHU_QUOTE_NOT_PAID     -423
+#define NOSTR_ERROR_CASHU_QUOTE_EXPIRED      -424
+#define NOSTR_ERROR_CASHU_PROOFS_SPENT       -425
+#define NOSTR_ERROR_CASHU_CRYPTO_FAILED      -426
+#define NOSTR_ERROR_CASHU_INVALID_KEYSET     -427
+```
+
+## Build System Changes
+
+### build.sh Updates
+
+1. Add `060` and `061` to the NIP detection patterns
+2. Add `cashu_mint.c` as a source when NIP-60 or NIP-61 is detected
+3. Add NIP descriptions: `NIP-060(Cashu-Wallet)`, `NIP-061(Nutzaps)`
+4. Update the `--nips=all` list to include `060` and `061`
+5. Update the help text with new NIP descriptions
+
+### nostr_core.h Updates
+
+Add includes:
+```c
+#include "nip060.h"  // Cashu Wallet
+#include "nip061.h"  // Nutzaps
+#include "cashu_mint.h"  // Cashu Mint HTTP Client
+```
+
+Add NIP-60/61 functions to the quick reference comment block.
+
+## Implementation Order
+
+The implementation should proceed in this order due to dependencies:
+
+1. **Error codes** in `nostr_common.h` — no dependencies
+2. **Cashu proof types** — shared between NIP-60 and NIP-61
+3. **`cashu_mint.h/c`** — Cashu mint HTTP client (depends on curl, cJSON)
+4. **`nip060.h/c`** — NIP-60 wallet events (depends on NIP-44, NIP-01, cashu types)
+5. **`nip061.h/c`** — NIP-61 nutzaps (depends on NIP-60 types, cashu types)
+6. **Build system** — update `build.sh` and `nostr_core.h`
+7. **Tests** — `nip60_test.c`, `nip61_test.c`, `cashu_mint_test.c`
+8. **Example** — `cashu_wallet.c`
+
+## Key Design Decisions
+
+### 1. Self-encryption for NIP-44
+NIP-60 encrypts content to the user's own key (sender = recipient). The NIP-44 encrypt/decrypt functions take sender_private_key and recipient_public_key. For self-encryption, we derive the user's public key from their private key and use that as the recipient.
+
+### 2. Cashu Crypto (Blinding)
+The Cashu protocol requires elliptic curve blinding operations (hash-to-curve, blind/unblind). These use secp256k1 which is already a dependency. The blinding math is:
+- `B_ = Y + r*G` where Y = hash_to_curve(secret), r = random blinding factor
+- `C_ = k*B_` (mint signs)
+- `C = C_ - r*K` where K = mint's public key (unblind)
+
+### 3. P2PK Secrets
+For NIP-61 nutzaps, proof secrets use the P2PK format:
+```json
+["P2PK", {"nonce": "<random>", "data": "02<pubkey>"}]
+```
+The `02` prefix is required for nostr-cashu compatibility.
+
+### 4. Curl Usage
+Following the same pattern as `nip005.c` — direct curl usage with write callbacks. No abstraction layer needed since curl is already a project dependency.
+
+## Test Strategy
+
+### NIP-60 Tests
+- Create and parse wallet events (round-trip encryption)
+- Create and parse token events with multiple proofs
+- Token deletion event creation
+- Rollover token creation with del references
+- History event creation and parsing
+- Quote event creation and parsing
+- Proof sum calculation
+- Filter creation helpers
+
+### NIP-61 Tests
+- Create and parse nutzap info events
+- Create and parse nutzap events
+- Nutzap verification against kind:10019
+- Redemption history event creation
+- Filter creation helpers
+
+### Cashu Mint Tests
+- Mint info parsing from JSON
+- Keyset parsing
+- Blinded message creation
+- Signature unblinding
+- P2PK secret generation
+- Proof state checking (mock or live mint)
+
+## Example Usage
+
+```c
+#include "nostr_core/nostr_core.h"
+
+// Create a wallet
+nostr_nip60_wallet_data_t wallet = {0};
+strcpy(wallet.privkey, "<generated-hex-privkey>");
+wallet.mint_urls = (char*[]){"https://mint.example.com"};
+wallet.mint_count = 1;
+
+cJSON* wallet_event = nostr_nip60_create_wallet_event(&wallet, my_privkey, 0);
+// Publish wallet_event to relays...
+
+// Store tokens
+nostr_cashu_proof_t proofs[2] = {
+    {.id = "00ad268c4d1f5826", .amount = 1, .secret = "...", .C = "02..."},
+    {.id = "00ad268c4d1f5826", .amount = 4, .secret = "...", .C = "02..."}
+};
+nostr_nip60_token_data_t token = {
+    .mint_url = "https://mint.example.com",
+    .proofs = proofs,
+    .proof_count = 2
+};
+
+cJSON* token_event = nostr_nip60_create_token_event(&token, my_privkey, 0);
+// Publish token_event to relays...
+
+// Send a nutzap
+nostr_nip61_nutzap_data_t nutzap = {
+    .content = "Great post!",
+    .proofs = p2pk_locked_proofs,
+    .proof_count = 1,
+    .mint_url = "https://mint.example.com",
+    .recipient_pubkey = "<bob-pubkey>",
+    .nutzapped_event_id = "<event-id>"
+};
+
+cJSON* nutzap_event = nostr_nip61_create_nutzap_event(&nutzap, my_privkey, 0);
+// Publish nutzap_event to relays...
+```
@@ -0,0 +1,47 @@
+[Tue Oct  7 05:51:04 2025] 🚀 Pool test started
+
+[Tue Oct  7 05:51:07 2025] 🏊 Pool started with default relay
+
+[Tue Oct  7 05:52:03 2025] 🔍 New subscription created (ID: 1)
+Filter: {
+	"limit":	10
+}
+
+[Tue Oct  7 05:52:03 2025] 📨 EVENT from ws://localhost:7555
+├── ID: 8433206a6e00...
+├── Pubkey: 17323141f3a9...
+├── Kind: 1
+├── Created: 1759687410
+└── Content: Test post at 2025-10-05 14:03:30
+
+[Tue Oct  7 05:52:03 2025] 📨 EVENT from ws://localhost:7555
+├── ID: ec98292f5700...
+├── Pubkey: aa3b44608a9e...
+├── Kind: 1
+├── Created: 1759687283
+└── Content: Test post at 2025-10-05 14:01:23
+
+[Tue Oct  7 05:52:03 2025] 📨 EVENT from ws://localhost:7555
+├── ID: c70d6c5c8745...
+├── Pubkey: 2a0c81450868...
+├── Kind: 1
+├── Created: 1759687249
+└── Content: Test post at 2025-10-05 14:00:49
+
+[Tue Oct  7 05:52:03 2025] 📨 EVENT from ws://localhost:7555
+├── ID: 15dbe2cfe923...
+├── Pubkey: 7c2065299249...
+├── Kind: 1
+├── Created: 1759687219
+└── Content: Test post at 2025-10-05 14:00:19
+
+[Tue Oct  7 05:52:03 2025] 📋 EOSE received - 0 events collected
+
+[Tue Oct  7 05:52:31 2025] 🔍 New subscription created (ID: 2)
+Filter: {
+	"since":	1759830747,
+	"limit":	10
+}
+
+[Tue Oct  7 05:52:31 2025] 📋 EOSE received - 0 events collected
+
--- a/Show More
+++ b/Show More
Author	SHA1	Message	Date
laantungir	363b7e9adf	Release v0.5.0	2026-03-19 09:13:59 -04:00
laantungir	3186c2ead6	just want to increment	2026-03-19 09:09:59 -04:00
laantungir	f07433578a	just want to increment	2026-03-19 09:09:46 -04:00
laantungir	d264d9f5ed	nip60	2026-03-19 09:01:11 -04:00
Your Name	98094cac86	fix relay pool sync query repeat behavior and add regression test	2026-03-16 05:27:23 -04:00
Your Name	79d98587d3	Delegate nostr_core_lib logging via callback and integrate single-file didactyl logging	2026-03-13 13:57:20 -04:00
Your Name	81814e8518	Various changes	2026-03-05 15:18:44 -04:00
Your Name	784cfc09c3	Add relay state transition cause capture in poll loop	2026-03-05 15:18:13 -04:00
Your Name	c87f8db6d8	Fix oversized ws frame handling and increase receive buffers	2026-03-05 14:42:14 -04:00
Your Name	c871c40219	query_sync: forward non-matching relay messages to pool dispatch	2026-03-05 14:07:11 -04:00
Your Name	2b3113dafc	relay_pool: skip reconnect attempts in publish_async	2026-03-05 11:01:21 -04:00
Your Name	5c51ab1f9f	Add socket recv/send timeouts after connect to prevent websocket poll hangs on half-broken connections	2026-03-05 10:39:51 -04:00
laantungir	df50ca1273	Add NIP-42 auth support to relay pool with verbose auth diagnostics test and docs updates	2026-03-01 08:49:55 -04:00
laantungir	2ce2ecbbfb	Implement NIP-46 remote signing API, tests/example, build integration, and refresh README docs	2026-02-28 09:53:35 -04:00
Your Name	57ecbf0c11	Fix SSL_pending busy-wait causing 100% CPU usage The tls_recv() function was skipping the select() call when SSL_pending() returned non-zero, causing a tight busy-wait loop. This fix ensures select() is always called, using a zero timeout when SSL has buffered data to return immediately, or the full timeout to properly block when waiting for new data. This prevents the relay client from consuming 100% CPU while maintaining the WebSocket connection.	2026-02-03 14:16:00 -04:00
laantungir	e87d7364ff	Rollback of nip44 changes, and added ability to modify timestamps in giftwraps.	2025-10-27 13:16:06 -04:00
Your Name	0b2cca6549	Add configurable timestamp randomization for NIP-59 gift wraps	2025-10-27 12:57:25 -04:00
laantungir	fca1a8077d	Revert NIP-44 to spec compliance (65535 bytes), keep NIP-04 at 1MB	2025-10-27 12:51:50 -04:00
laantungir	2c128a6295	Upgrade nip4 and nip44 to be able to handle 1MB payloads.	2025-10-24 18:56:30 -04:00
laantungir	24903b8c90	Adding async publish to relay pool	2025-10-09 09:19:11 -04:00
laantungir	c6896eebb4	added nip 17	2025-10-04 18:32:28 -04:00
laantungir	4e06d8f723	Implement NIP-21: nostr: URI scheme with full support for note, nprofile, nevent, and naddr URIs including TLV encoding/decoding and comprehensive test suite	2025-10-03 06:10:56 -04:00
laantungir	d7a8aa1dc4	nip 17, and 59	2025-10-03 04:25:10 -04:00
laantungir	cdeb569a16	Add enhanced subscription functionality with EOSE result modes	2025-10-02 15:00:50 -04:00
laantungir	2224448d12	Getting the relay pool up to speed	2025-10-02 11:51:41 -04:00
laantungir	9bf74e76ce	Updated synchronous relay queries to handle nip42.	2025-09-30 12:16:23 -04:00
laantungir	d52ac9c106	Merge branch 'master' of ssh://git.laantungir.net:222/laantungir/nostr_core_lib Working on Ginxsom auth and NIP 42 on a different computer at the same time. My bad.	2025-09-07 13:07:02 -04:00
laantungir	e087a17eb9	Add NIP-42 implementation and local updates - Added NIP-42 authentication implementation (nip042.c, nip042.h) - Added NIP-42 test suite (nip42_test.c, nip42_test) - Updated common core files for NIP-42 support - Updated build script - Rebuilt test binaries	2025-09-07 13:04:53 -04:00
Your Name	d7e43328bb	Add unified request validation system with authentication rules - Add request_validator.h/c with comprehensive authentication system - Implement pluggable database backend interface (SQLite default) - Add priority-based rule evaluation engine with caching - Support pubkey whitelist/blacklist, hash blacklist, MIME restrictions - Add new authentication error codes to nostr_common.h - Include request_validator.h in nostr_core.h - Update build.sh to compile request_validator.c - Designed for shared use between ginxsom and c-relay projects	2025-09-07 09:44:38 -04:00
laantungir	0af77dffab	nip13 validation added	2025-09-05 13:42:03 -04:00
laantungir	0f72d7433a	readme.md	2025-09-03 15:16:08 -04:00
laantungir	2f3140d4f6	remove exposed .h crypto headers	2025-09-02 12:36:52 -04:00
laantungir	31947d12b7	Streaming sha256	2025-08-19 11:24:48 -04:00
laantungir	9e9fcba96c	version	2025-08-19 07:02:42 -04:00
laantungir	4a096ff35f	Nostr note validation added to nip01	2025-08-19 06:59:04 -04:00
laantungir	64aee10a21	clean up	2025-08-17 14:14:52 -04:00
laantungir	a9a1aff682	Fixed bug in nip44.c, was an error in ecdh_shared_secret. Added comments	2025-08-17 11:29:07 -04:00
laantungir	a4fbba027e	Fixed error in nip04 implementation. Now working	2025-08-17 10:42:38 -04:00
laantungir	fdc7cc2a38	comparison test for debugging	2025-08-16 17:48:02 -04:00
laantungir	9879457d7e	remove secp256 from project	2025-08-16 14:09:26 -04:00
laantungir	6722d09579	feat: migrate to system dependencies from static linking BREAKING CHANGE: Library now requires system-installed dependencies Major Changes: - Convert secp256k1 from bundled static lib to system dependency - Convert OpenSSL from bundled static lib to system dependency - Convert curl from bundled static lib to system dependency - Update build.sh with pkg-config detection and fallback logic - Remove all static library extraction/building logic - Update README.md with new dependency requirements and installation Build System: - Add detect_system_secp256k1() with pkg-config support - Add detect_system_openssl() with pkg-config support - Add detect_system_curl() with pkg-config support - Remove secp256k1 building/extraction from ar archive - Update CFLAGS and LIBS to use system library variables - Clear error messages for missing dependencies with install commands Documentation: - Add system dependency installation for Ubuntu/Debian/CentOS/macOS - Update all compile/link examples to include -lssl -lcrypto -lcurl -lsecp256k1 - Remove references to 'self-contained' and 'no external dependencies' - Update integration examples throughout README Benefits: - Smaller library size (only internal code bundled) - Automatic security updates via system package manager - Standard Linux library distribution pattern - Reduced build complexity - Better system integration with pkg-config Required Installation: Ubuntu/Debian: sudo apt install libssl-dev libcurl4-openssl-dev libsecp256k1-dev CentOS/RHEL: sudo yum install openssl-devel libcurl-devel libsecp256k1-devel macOS: brew install openssl curl secp256k1	2025-08-16 13:59:29 -04:00
laantungir	3533c874ea	un-nest curl	2025-08-16 11:22:44 -04:00
laantungir	553774fdc4	secp256k1	2025-08-16 10:48:58 -04:00
laantungir	3f5024c24c	Add in secp256k repo so that customer can build.	2025-08-16 10:39:49 -04:00
laantungir	8bcf76387b	Updated build.sh to build curl, openssl, and 256k1 if needed	2025-08-16 10:26:39 -04:00
laantungir	7bf39a7e10	Simplify build script directory validation - Replace file-based validation with directory name check - Now simply checks if current directory is named 'nostr_core_lib' - More reliable and clearer error messages for customers - Fixes issue where customers get validation errors when running from properly named directories	2025-08-16 09:45:27 -04:00
laantungir	ec5a97f951	Update library usage documentation	2025-08-16 09:36:39 -04:00
laantungir	9913f92c96	Fix build script path resolution for customer Makefile usage - Added BUILD_DIR=/home/teknari/Sync/Programming/VibeCoding/nostr_core_lib to capture absolute build directory - Changed relative paths to absolute paths in archive extraction - Fixes 'No such file or directory' error when build.sh is called from customer Makefiles - Maintains backward compatibility for all existing use cases	2025-08-16 09:34:57 -04:00
laantungir	dad1f5aa52	Working in the mines	2025-08-16 08:51:04 -04:00
laantungir	241ca036ed	Refactor and consolidate test suite - Moved old tests from tests/old/ to main tests/ directory - Renamed nostr_test_bip32.c to bip32_test.c for consistency - Renamed nostr_crypto_test.c to crypto_test.c for consistency - Renamed wss_test.c and moved from old directory - Fixed unused variable warning in bip32_test.c - Updated build system and workspace rules - Cleaned up old compiled test executables - Updated nostr_common.h and core_relays.c - Removed obsolete nostr_core.h.old backup file This consolidates all active tests into the main directory and removes outdated test files while maintaining a clean, organized structure.	2025-08-16 08:38:41 -04:00
laantungir	997c3e976b	Completed refactoring to separate nip files, and updating build.sh	2025-08-16 07:42:48 -04:00
laantungir	ea9b8918f6	Last version before deleting Makefile and CmakeLists.txt	2025-08-15 16:32:59 -04:00
laantungir	52e5d300fc	Final fix for curl callback function signature - use proper void* types	2025-08-15 09:14:53 -04:00
laantungir	ace0b5a792	Fixed curl type warnings - callback function signature and timeout parameter casting	2025-08-15 09:12:55 -04:00
laantungir	04f22e6f47	Improved POW	2025-08-15 07:47:16 -04:00
laantungir	e8c0fcdf63	.	2025-08-14 19:15:55 -04:00
laantungir	7cf7ffe025	.	2025-08-14 18:30:16 -04:00
laantungir	a2b700cf40	version	2025-08-14 17:52:45 -04:00
laantungir	dfe8a20e2e	Add automatic dependency building to Makefile - Add secp256k1 auto-building rule for x64 target - Fix customer build errors with missing secp256k1/.libs/libsecp256k1.a - Force clean rebuild when secp256k1 library is missing - Customers can now run 'make' directly without manual dependency building - Maintains existing ARM64 cross-compilation auto-building functionality	2025-08-14 17:43:33 -04:00
laantungir	3cfddbe75b	.	2025-08-14 16:43:46 -04:00
laantungir	8c610b6e36	Fix submodule compatibility: Remove version.c dependency and include cjson source files - Remove nostr_core/version.c from Makefile LIB_SOURCES to fix submodule build failures - Remove cjson/ from .gitignore and add cjson source files to repository - Consolidate cJSON.h into cjson/ directory (remove duplicate from nostr_core/) - Simplify build.sh versioning to only manage git tags and VERSION file - Update examples/version_test.c to work without version functions - Consumer projects can now use 'make' directly without missing file errors	2025-08-14 16:40:34 -04:00
laantungir	2de890da5c	clean up versioning	2025-08-14 16:26:37 -04:00
laantungir	bb673cc1a4	Initial template structure from nostr_core_lib - Complete C library template with OpenSSL-based crypto - Comprehensive build system (Makefile, build.sh) - Example code and test suite - Documentation and usage guides - Cross-platform compatibility (x64/ARM64) - Production-ready structure for C library projects	2025-08-14 15:10:59 -04:00
laantungir	f6c8ef6246	Adding in curl and openssl repos	2025-08-14 12:09:30 -04:00
laantungir	01d382c0d3	Complete mbedTLS cleanup - Removed all mbedTLS dependencies and updated documentation - Moved mbedTLS directories to Trash/ (mbedtls/, mbedtls-install/, mbedtls-arm64-install/) - Removed obsolete nostr_websocket_mbedtls.c implementation - Updated nostr_websocket/Makefile to use OpenSSL instead of mbedTLS - Updated nostr_websocket/README.md with OpenSSL migration notes - Updated nostr_websocket/EXPORT_GUIDE.md with OpenSSL instructions - All tests pass: crypto tests, static linking verification - Build system fully functional with OpenSSL-only dependencies	2025-08-14 11:59:03 -04:00
laantungir	f86fb256b2	Pre-mbedTLS cleanup checkpoint - OpenSSL migration complete, all tests passing	2025-08-14 11:51:26 -04:00
laantungir	ac85ab6f07	Last commit before switching from mbedtls to openssl	2025-08-14 09:58:24 -04:00
laantungir	cfde3bcb0f	cJSON.h added	2025-08-12 21:05:39 -04:00
laantungir	a4ae8df66f	Fully statically linked for both x64 and arm64. Updated build.sh to always compile both versions	2025-08-11 06:54:50 -04:00
laantungir	3108661b0a	added nostr_decode_npub	2025-08-09 11:40:34 -04:00
laantungir	3b076ea372	.	2025-08-09 11:07:11 -04:00
@@ -1 +1 @@
 .0.157
 .5.0