How to Calculate Transaction Hash

Transaction hash is calculated as follows:

ckbhash(molecule_encode(tx_excluding_witness))

Where:

• ckbhash is the BLAKE2b hash algorithm specifically used in CKB. For details, refer to ckbhash.

• molecule_encode serializes a structure into a binary format with the Molecule serialization method

• tx_excluding_witness refers to the transaction structure excluding the witness field, i.e., a raw transaction

The definition of RawTransaction is as follows:

table RawTransaction {
    version:        Uint32,
    cell_deps:      CellDepVec,
    header_deps:    Byte32Vec,
    inputs:         CellInputVec,
    outputs:        CellOutputVec,
    outputs_data:   BytesVec,
}