Function UpdatePSBTOutput

src/psbt.cpp:602–624

}

void UpdatePSBTOutput(const SigningProvider& provider, PartiallySignedTransaction& psbt, int index)
{
    std::optional<CMutableTransaction> unsigned_tx = psbt.GetUnsignedTx();
    if (!unsigned_tx) {
        return;
    }
    CMutableTransaction& tx = *unsigned_tx;
    const CTxOut& out = tx.vout.at(index);
    PSBTOutput& psbt_out = psbt.outputs.at(index);

    // Fill a SignatureData with output info
    SignatureData sigdata;
    psbt_out.FillSignatureData(sigdata);

    // Construct a would-be spend of this output, to update sigdata with.
    // Note that ProduceSignature is used to fill in metadata (not actual signatures),
    // so provider does not need to provide any private keys (it can be a HidingSigningProvider).
    MutableTransactionSignatureCreator creator(tx, /*input_idx=*/0, out.nValue, {.sighash_type = SIGHASH_ALL});
    ProduceSignature(provider, creator, out.scriptPubKey, sigdata);

    // Put redeem_script, witness_script, key paths, into PSBTOutput.
    psbt_out.FromSignatureData(sigdata);
}

std::optional<PrecomputedTransactionData> PrecomputePSBTData(const PartiallySignedTransaction& psbt)
{