Function CheckSignetBlockSolution

src/signet.cpp:125–152

Signet block solution checker

// Signet block solution checker
bool CheckSignetBlockSolution(const CBlock& block, const Consensus::Params& consensusParams)
{
    if (block.GetHash() == consensusParams.hashGenesisBlock) {
        // genesis block solution is always valid
        return true;
    }

    const CScript challenge(consensusParams.signet_challenge.begin(), consensusParams.signet_challenge.end());
    const std::optional<SignetTxs> signet_txs = SignetTxs::Create(block, challenge);

    if (!signet_txs) {
        LogPrint(BCLog::VALIDATION, "CheckSignetBlockSolution: Errors in block (block solution parse failure)\n");
        return false;
    }

    const CScript& scriptSig = signet_txs->m_to_sign.vin[0].scriptSig;
    const CScriptWitness& witness = signet_txs->m_to_sign.witness.vtxinwit[0].scriptWitness;

    PrecomputedTransactionData txdata;
    txdata.Init(signet_txs->m_to_sign, {signet_txs->m_to_spend.vout[0]});
    TransactionSignatureChecker sigcheck(&signet_txs->m_to_sign, /* nInIn= */ 0, /* amountIn= */ signet_txs->m_to_spend.vout[0].nValue, txdata, MissingDataBehavior::ASSERT_FAIL);

    if (!VerifyScript(scriptSig, signet_txs->m_to_spend.vout[0].scriptPubKey, &witness, BLOCK_SCRIPT_VERIFY_FLAGS, sigcheck)) {
        LogPrint(BCLog::VALIDATION, "CheckSignetBlockSolution: Errors in block (block solution invalid)\n");
        return false;
    }
    return true;
}