Update app.py

app.py

@@ -273,11 +273,11 @@ def mychain_mine_block_send(balance, chain_r=None,chain_n=None):
 
     previous_post = mychain_send.print_previous_block()
     
-    block = {'index': previous_post['index'],
+    block = {'index': previous_post[['index'],
             'timestamp': previous_post['timestamp'],
-            'sender': previous_post['transactions'][0],
-            'recipient': previous_post['transactions'][1],
-            'amount': previous_post['transactions'][2],
+            'sender': previous_post['transactions'][0]['sender'],
+            'recipient': previous_post['transactions'][0]['recipient'],
+            'amount': previous_post['transactions'][0]['amount'],
             'balance': previous_post['balance'], 
             'proof': previous_post['proof'],
             'previous_hash': previous_post['previous_hash']}