input: 
  def construct_basic_blockchain():
      """Compose a basic blockchain system in Python using SHA256 for hashing.
      >>> block_data = {'timestamp': '2023-10-01 12:00:00', 'data': 'First block data'}
      >>> blockchain = Blockchain()
      >>> blockchain.add_block(block_data)
      >>> blockchain.get_chain()
      '[
        {
          "index": 0,
          "timestamp": "2023-10-01 12:00:00",
          "data": "First block data",
          "previous_hash": null,
          "hash": "3c35d05c...8b4e3603" # Redacted hash for brevity
        }
      ]'
      """
  
output:     
      class Block:
          def __init__(self, index, timestamp, data, previous_hash):
              self.index = index
              self.timestamp = timestamp
              self.data = data
              self.previous_hash = previous_hash
              self.hash = self.calculate_hash()
  
          def calculate_hash(self):
              block_string = f"{self.index}{self.timestamp}{self.data}{self.previous_hash}"
              return hashlib.sha256(block_string.encode()).hexdigest()
  
      class Blockchain:
          def __init__(self):
              self.chain = [self.create_genesis_block()]
  
          def create_genesis_block(self):
              return Block(0, "2023-10-01 12:00:00", "Genesis Block", "0")
  
          def get_latest_block(self):
              return self.chain[-1]
  
          def add_block(self, data):
              latest_block = self.get_latest_block()
              new_block = Block(latest_block.index + 1, data['timestamp'], data['data'], latest_block.hash)
              self.chain.append(new_block)
  
          def get_chain(self):
              chain_data = []
              for block in self.chain:
                  chain_data.append({
                      "index": block.index,
                      "timestamp": block.timestamp,
                      "data": block.data,
                      "previous_hash": block.previous_hash,
                      "hash": block.hash
                  })
              return json.dumps(chain_data, indent=4)
  