Update app.py

app.py

@@ -8,7 +8,7 @@ import requests
 from blockchain import Blockchain
 from huggingface_hub import (create_repo,get_full_repo_name,upload_file,CommitOperationAdd,HfApi)
 
-main_chain='https://huggingface.co/datasets/Omnibus/blockchain-sim/raw/main/'
+main_chain='https://huggingface.co/datasets/Omnibus/blockchain-sim/raw/main/chains/'
 main_balance='https://huggingface.co/datasets/Omnibus/blockchain-sim/raw/main/balance/'
 
 main_nodes='https://huggingface.co/datasets/Omnibus/blockchain-sim/raw/main/node_file1.json'