code: def _validate_depedencies(batches):
      
      transaction_ids = set()
      for batch in batches:
          for txn in batch.transactions:
              txn_header = TransactionHeader()
              txn_header.ParseFromString(txn.header)
  
              if txn_header.dependencies:
                  unsatisfied_deps = [
                      id for id in txn_header.dependencies
                      if id not in transaction_ids
                  ]
                  if unsatisfied_deps:
                      raise CliException(
                          'Unsatisfied dependency in given transactions:'
                          ' {}'.format(unsatisfied_deps))
  
              transaction_ids.add(txn.header_signature)
docs: Validates the transaction dependencies for the transactions contained
      within the sequence of batches. Given that all the batches are expected to
      to be executed for the genesis blocks, it is assumed that any dependent
      transaction will proceed the depending transaction.