Update app.py

app.py

@@ -454,7 +454,7 @@ with gr.Blocks() as bc:
                         create_bc = gr.Button("Create New Blockchain")
                 #send=gr.Textbox(label="Sender")
                 send = gr.Dropdown(label="Sender", choices=[f for f in send_list], value = "Bank")
-                rec=gr.Dropdown(label="Recipient", choices=[f for f in rec_list])
+                rec=gr.Dropdown(label="Recipient", choices=[f for f in rec_list], allow_custom_value=True)
                 am=gr.Textbox(label="Amount")
                 send_trans=gr.Button("Post Transaction")
                 mine_b = gr.Button("Mine Block")