Update app.py

app.py

@@ -135,9 +135,10 @@ def add_transaction(id, kind, data):
 
 def proof(model_name):
     peers = get_peers(model_name)
-    for p in gpu_add_list:
-        if not p in peers:
-            add_transaction(get_id_from_p2p(peer), "out", 0)    
+    for id in blockchain.user_gpus:
+        if not get_p(id) in peers:
+            add_transaction(id, "out", 0)
+    
 
 def get_coin(id):
     c = blockchain.get_user_balance(id)