Update app.py

app.py

@@ -130,7 +130,7 @@ async def sign_message(payload: dict):
 
     message = base58.b58decode(payload["message"])
     signature = payload["signature"]        # list[str]
-    public_key = payload["public_key"]      # list[str]
+    public_key = payload["anchorB58"]      # list[str]
 
     is_valid = verify_wots(signature, message, public_key)