Class CBlock

test/functional/test_framework/messages.py:1183–1260

assert_equal(BLOCK_HEADER_SIZE, 79)

class CBlock(CBlockHeader):
    __slots__ = ("vtx",)

    def __init__(self, header=None):
        super().__init__(header)
        self.vtx = []

    def deserialize(self, f):
        super().deserialize(f)
        self.vtx = deser_vector(f, CTransaction)

    def serialize(self, with_witness=True):
        r = b""
        r += super().serialize()
        if with_witness:
            r += ser_vector(self.vtx, "serialize_with_witness")
        else:
            r += ser_vector(self.vtx, "serialize_without_witness")
        return r

    # Calculate the merkle root given a vector of transaction hashes
    @classmethod
    def get_merkle_root(cls, hashes):
        while len(hashes) > 1:
            newhashes = []
            for i in range(0, len(hashes), 2):
                i2 = min(i+1, len(hashes)-1)
                newhashes.append(hash256(hashes[i] + hashes[i2]))
            hashes = newhashes
        return uint256_from_str(hashes[0])

    def calc_merkle_root(self):
        hashes = []
        for tx in self.vtx:
            tx.calc_sha256()
            hashes.append(ser_uint256(tx.sha256))
        return self.get_merkle_root(hashes)

    def calc_witness_merkle_root(self):
        hashes = []
        for tx in self.vtx:
            # Calculate the hashes with witness data
            hashes.append(tx.calc_witness_hash())

        # returns bitcoin hash print order hex string
        return calcfastmerkleroot(hashes)

    def is_valid(self):
        self.calc_sha256()
# TODO: check signatures
#        target = uint256_from_compact(self.nBits)
#        if self.sha256 > target:
#            return False
        for tx in self.vtx:
            if not tx.is_valid():
                return False
        if self.calc_merkle_root() != self.hashMerkleRoot:
            return False