text: from blockchain import Blockchain
  
  block_one_transactions = {"sender": "Alice", "receiver": "Bob", "amount": "50"}
  block_two_transactions = {"sender": "Bob", "receiver": "Cole", "amount": "25"}
  block_three_transactions = {"sender": "Alice", "receiver": "Cole", "amount": "35"}
  
  # fake transaction
  fake_transactions = {"sender": "Bob", "receiver": "Cole, Alice", "amount": "25"}
  
  local_blockchain = Blockchain()
  local_blockchain.print_blocks()
  
  local_blockchain.add_block(block_one_transactions)
  local_blockchain.add_block(block_two_transactions)
  local_blockchain.add_block(block_three_transactions)
  local_blockchain.print_blocks()
  local_blockchain.chain[2].transactions = fake_transactions
  local_blockchain.validate_chain()
  
  