diff --git a/src/lib/pubkey.ts b/src/lib/pubkey.ts
index 126dc9c1..d3258273 100644
--- a/src/lib/pubkey.ts
+++ b/src/lib/pubkey.ts
@@ -42,6 +42,10 @@ export function userIdToPubkey(userId: string) {
   return userId
 }
 
+export function isValidPubkey(pubkey: string) {
+  return /^[0-9a-f]{64}$/.test(pubkey)
+}
+
 const pubkeyImageCache = new LRUCache<string, string>({ max: 1000 })
 export function generateImageByPubkey(pubkey: string): string {
   if (pubkeyImageCache.has(pubkey)) {
diff --git a/src/lib/tag.ts b/src/lib/tag.ts
index 81339d8f..bf3d8f2b 100644
--- a/src/lib/tag.ts
+++ b/src/lib/tag.ts
@@ -1,5 +1,6 @@
 import { TImageInfo } from '@/types'
 import { isBlurhashValid } from 'blurhash'
+import { isValidPubkey } from './pubkey'
 
 export function tagNameEquals(tagName: string) {
   return (tag: string[]) => tag[0] === tagName
@@ -49,7 +50,7 @@ export function extractPubkeysFromEventTags(tags: string[][]) {
       tags
         .filter(tagNameEquals('p'))
         .map(([, pubkey]) => pubkey)
-        .filter(Boolean)
+        .filter((pubkey) => !!pubkey && isValidPubkey(pubkey))
         .reverse()
     )
   )