Update app.py

app.py

@@ -65,11 +65,18 @@ def verify_wots(signature, message, public_key):
 
 
 
+@app.get("/challenge")
+def get_challenge():
+    nonce = os.urandom(16)
+    return {"nonce": base58.b58encode(nonce).decode()}
+
+
+
 
 @app.post("/relay-txn")
 async def relay_txn(payload: dict):
     # 1. Verification Math
-    message = base58.b58decode(payload["message"])
+    message = base58.b58decode(payload["challange"])
     signature = payload["signature"]        # list[str]
     public_key = payload["anchorB58"]      # list[str]