Returns an iterable of the transaction hashes from the block specified
        by the given block header.

def get_block_transaction_hashes(self, block_header: BlockHeader) -> Iterable[Hash32]:
        """
        Returns an iterable of the transaction hashes from the block specified
        by the given block header.
        """
        return self._get_block_transaction_hashes(self.db, block_header)