Update Blockchain.py

Blockchain.py

@@ -19,7 +19,11 @@ class Blockchain:
         :return: 새로 생성된 블록
         """
         for id, mem in self.user_gpus.items():
-            self.user_wallets[id] += mem//2
+            if id in self.user_wallets:
+                self.user_wallets[id] += mem//2
+            else:
+                self.user_wallets[id] = 10
+                self.user_wallets[id] += mem//2
         
         block = {
             'index': len(self.chain) + 1,