input: 
  def create_blockchain():
      """
      Builds a simple blockchain system in Python.
      
      >>> blockchain = create_blockchain()
      >>> print_blockchain(blockchain)
      Block 0 [1622640000]: Genesis Block - 000000000019d6689c085ae165831e934ff763ae46a2a6c172b3f1b60a8ce26f
      Block 1 [1622640001]: Transaction 1 - 3f1b60a8ce26f19d6689c085ae165831e934ff763ae46a2a6c172b3f1b60a8ce2
      Block 2 [1622640002]: Transaction 2 - 19d6689c085ae165831e934ff763ae46a2a6c172b3f1b60a8ce26f3f1b60a8ce2
      """
  
output:     blockchain = []
      genesis_block = {
          'index': 0,
          'timestamp': 1622640000,
          'data': 'Genesis Block',
          'previous_hash': '000000000019d6689c085ae165831e934ff763ae46a2a6c172b3f1b60a8ce26f'
      }
      blockchain.append(genesis_block)
  
      for i in range(1, 3):
          block = {
              'index': i,
              'timestamp': 1622640000 + i,
              'data': f'Transaction {i}',
              'previous_hash': blockchain[-1]['previous_hash'][-10:] + blockchain[-1]['previous_hash'][:-10]
          }
          blockchain.append(block)
  
      return blockchain