input: 
  from typing import List
  
  def blockchain_initialized(blockchain_object) -> bool:
      """ Check if the given blockchain object is properly initialized, 
      containing at least one block.
      >>> blockchain = Blockchain()
      >>> block_data = {'timestamp': '2023-10-01T12:00:00', 'data': 'Transaction1'}
      >>> blockchain.add_block(block_data)
      >>> blockchain_initialized(blockchain)
      True
      >>> blockchain = Blockchain()
      >>> blockchain_initialized(blockchain)
      False
      """
  
output:     return len(blockchain_object.chain) > 0