Custom-built Arti native libraries for Zapstore. Adapted from Amethyst's tools/arti-build: same size-optimized wrapper, JNI names retargeted to dev.zapstore.app.transport.ArtiNative.

The app ships arm64-v8a only. make vendor from the repo root runs ./build-arti.sh and writes:

src/main/jniLibs/arm64-v8a/libarti_android.so

Commit that .so after a successful vendor. Rebuild when bumping ARTI_VERSION, changing src/lib.rs, or verifying reproducibility.

Prerequisites

rustup (the toolchain in rust-toolchain.toml is installed automatically)
cargo install cargo-ndk --version "$(cat CARGO_NDK_VERSION)" --locked
The exact NDK in ANDROID_NDK_VERSION: sdkmanager "ndk;$(cat ANDROID_NDK_VERSION)"

Commands

./build-arti.sh              # arm64-v8a
./build-arti.sh --clean      # wipe the Arti clone and rebuild
./verify-reproducible.sh     # two clean builds, then diff

The compile happens at /tmp/zapstore-arti-build so the output is path-independent. Override with ARTI_REPRO_DIR only if you do not need to match committed bytes.