diff --git a/jsr.json b/jsr.json
index c959cf6..b2b80aa 100644
--- a/jsr.json
+++ b/jsr.json
@@ -1,6 +1,6 @@
 {
   "name": "@nostr/tools",
-  "version": "2.23.7",
+  "version": "2.23.8",
   "exports": {
     ".": "./index.ts",
     "./core": "./core.ts",
diff --git a/nip10.ts b/nip10.ts
index 6f5087e..d8b26d1 100644
--- a/nip10.ts
+++ b/nip10.ts
@@ -1,6 +1,8 @@
 import type { Event } from './core.ts'
 import type { EventPointer, ProfilePointer } from './nip19.ts'
 
+const HEX64 = /^[0-9a-fA-F]{64}$/
+
 export function parse(event: Pick<Event, 'tags'>): {
   /**
    * Pointer to the root of the thread.
@@ -41,7 +43,7 @@ export function parse(event: Pick<Event, 'tags'>): {
   for (let i = event.tags.length - 1; i >= 0; i--) {
     const tag = event.tags[i]
 
-    if (tag[0] === 'e' && tag[1]) {
+    if (tag[0] === 'e' && tag[1] && HEX64.test(tag[1])) {
       const [_, eTagEventId, eTagRelayUrl, eTagMarker, eTagAuthor] = tag as [
         string,
         string,
@@ -53,7 +55,7 @@ export function parse(event: Pick<Event, 'tags'>): {
       const eventPointer: EventPointer = {
         id: eTagEventId,
         relays: eTagRelayUrl ? [eTagRelayUrl] : [],
-        author: eTagAuthor,
+        author: eTagAuthor && HEX64.test(eTagAuthor) ? eTagAuthor : undefined,
       }
 
       if (eTagMarker === 'root') {
@@ -81,7 +83,7 @@ export function parse(event: Pick<Event, 'tags'>): {
       continue
     }
 
-    if (tag[0] === 'q' && tag[1]) {
+    if (tag[0] === 'q' && tag[1] && HEX64.test(tag[1])) {
       const [_, eTagEventId, eTagRelayUrl] = tag as [string, string, undefined | string]
       result.quotes.push({
         id: eTagEventId,
@@ -89,7 +91,7 @@ export function parse(event: Pick<Event, 'tags'>): {
       })
     }
 
-    if (tag[0] === 'p' && tag[1]) {
+    if (tag[0] === 'p' && tag[1] && HEX64.test(tag[1])) {
       result.profiles.push({
         pubkey: tag[1],
         relays: tag[2] ? [tag[2]] : [],
diff --git a/nip22.ts b/nip22.ts
index edcf011..d2d8a76 100644
--- a/nip22.ts
+++ b/nip22.ts
@@ -1,6 +1,8 @@
 import type { Event } from './core.ts'
 import type { AddressPointer, EventPointer, ProfilePointer } from './nip19.ts'
 
+const HEX64 = /^[0-9a-fA-F]{64}$/
+
 export type ExternalPointer = {
   value: string
   hint?: string
@@ -19,9 +21,12 @@ function parseAddressPointer(value: string, relayUrl?: string): AddressPointer |
   const kind = parseInt(value.slice(0, idx), 10)
   if (Number.isNaN(kind)) return undefined
 
+  const pubkey = value.slice(idx + 1, idx2)
+  if (!HEX64.test(pubkey)) return undefined
+
   return {
     kind,
-    pubkey: value.slice(idx + 1, idx2),
+    pubkey,
     identifier: value.slice(idx2 + 1),
     relays: relayUrl ? [relayUrl] : [],
   }
@@ -31,11 +36,11 @@ function parsePointer(tag: string[]): EventPointer | AddressPointer | ExternalPo
   switch (tag[0]) {
     case 'E':
     case 'e':
-      if (!tag[1]) return undefined
+      if (!tag[1] || !HEX64.test(tag[1])) return undefined
       return {
         id: tag[1],
         relays: tag[2] ? [tag[2]] : [],
-        author: tag[3],
+        author: tag[3] && HEX64.test(tag[3]) ? tag[3] : undefined,
       }
     case 'A':
     case 'a':
@@ -58,10 +63,12 @@ function parseQuote(tag: string[]): EventPointer | AddressPointer | ExternalPoin
     return parseAddressPointer(tag[1], tag[2])
   }
 
+  if (!HEX64.test(tag[1])) return undefined
+
   return {
     id: tag[1],
     relays: tag[2] ? [tag[2]] : [],
-    author: tag[3],
+    author: tag[3] && HEX64.test(tag[3]) ? tag[3] : undefined,
   }
 }
 
@@ -172,7 +179,7 @@ export function parse(event: Pick<Event, 'tags'>): {
       continue
     }
 
-    if ((tag[0] === 'P' || tag[0] === 'p') && tag[1]) {
+    if ((tag[0] === 'P' || tag[0] === 'p') && tag[1] && HEX64.test(tag[1])) {
       result.profiles.push({
         pubkey: tag[1],
         relays: tag[2] ? [tag[2]] : [],
diff --git a/package.json b/package.json
index 0bcf0a0..f44fa44 100644
--- a/package.json
+++ b/package.json
@@ -1,7 +1,7 @@
 {
   "type": "module",
   "name": "nostr-tools",
-  "version": "2.23.7",
+  "version": "2.23.8",
   "description": "Tools for making a Nostr client.",
   "repository": {
     "type": "git",