def check_merkle_hash(self):
        calculated_hash = merkle([tx.hash() for tx in self.txs], double_sha256)
        if calculated_hash != self.merkle_root:
            raise BadMerkleRootError("calculated %s but block contains %s" % (b2h(calculated_hash), b2h(self.merkle_root)))
Raise a BadMerkleRootError if the Merkle hash of the
dataset/ETHPy150Open maraoz/proofofexistence/pycoin/block.py/Block.check_merkle_hash