code: def create_default_bls_bft_factory(node):
      '''
      Creates a default BLS factory to instantiate BLS BFT classes.
  
      :param node: Node instance
      :return: BLS factory instance
      '''
      bls_keys_dir = os.path.join(node.keys_dir, node.name)
      bls_crypto_factory = create_default_bls_crypto_factory(bls_keys_dir)
      return BlsFactoryBftPlenum(bls_crypto_factory, nodef create_default_bls_bft_factory(node):
      '''
      Creates a default BLS factory to instantiate BLS BFT classes.
  
      :param node: Node instance
      :return: BLS factory instance
      '''
      bls_keys_dir = os.path.join(node.keys_dir, node.name)
      bls_crypto_factory = create_default_bls_crypto_factory(bls_keys_dir)
      return BlsFactoryBftPlenum(bls_crypto_factory, node)
docs: Creates a default BLS factory to instantiate BLS BFT classes.
  
      :param node: Node instance
      :return: BLS factory instance