def METHOD_NAME(vtx):
    return (
        4  + # nVersion
        32 + # hashPrevBlock
        32 + # hashMerkleRoot
        32 + # hashFinalSaplingRoot
        4  + # nTime
        4  + # nBits
        32 + # nNonce
        compact_size_size(1344) + # solutionSize
        1344 + # solution
        compact_size_size(len(vtx)) +
        sum([v4_tx_size(**tx) for tx in vtx])
    )