Function GetBlockScriptFlags

src/validation.cpp:2001–2052

static ThresholdConditionCache warningcache[VERSIONBITS_NUM_BITS] GUARDED_BY(cs_main);

static unsigned int GetBlockScriptFlags(const CBlockIndex* pindex, const Consensus::Params& consensusparams)
{
    unsigned int flags = SCRIPT_VERIFY_NONE;

    // BIP16 didn't become active until Apr 1 2012 (on mainnet, and
    // retroactively applied to testnet)
    // However, only one historical block violated the P2SH rules (on both
    // mainnet and testnet), so for simplicity, always leave P2SH
    // on except for the one violating block.
    if (consensusparams.BIP16Exception.IsNull() || // no bip16 exception on this chain
        pindex->phashBlock == nullptr || // this is a new candidate block, eg from TestBlockValidity()
        *pindex->phashBlock != consensusparams.BIP16Exception) // this block isn't the historical exception
    {
        // Enforce WITNESS rules whenever P2SH is in effect
        flags |= SCRIPT_VERIFY_P2SH | SCRIPT_VERIFY_WITNESS;
    }

    // Enforce the DERSIG (BIP66) rule
    if (DeploymentActiveAt(*pindex, consensusparams, Consensus::DEPLOYMENT_DERSIG)) {
        flags |= SCRIPT_VERIFY_DERSIG;
    }

    // Enforce CHECKLOCKTIMEVERIFY (BIP65)
    if (DeploymentActiveAt(*pindex, consensusparams, Consensus::DEPLOYMENT_CLTV)) {
        flags |= SCRIPT_VERIFY_CHECKLOCKTIMEVERIFY;
    }

    // Enforce CHECKSEQUENCEVERIFY (BIP112)
    if (DeploymentActiveAt(*pindex, consensusparams, Consensus::DEPLOYMENT_CSV)) {
        flags |= SCRIPT_VERIFY_CHECKSEQUENCEVERIFY;
    }

    // Enforce Taproot (BIP340-BIP342)
    if (DeploymentActiveAt(*pindex, consensusparams, Consensus::DEPLOYMENT_TAPROOT)) {
        flags |= SCRIPT_VERIFY_TAPROOT;
    }

    // Enforce BIP147 NULLDUMMY (activated simultaneously with segwit)
    if (DeploymentActiveAt(*pindex, consensusparams, Consensus::DEPLOYMENT_SEGWIT)) {
        flags |= SCRIPT_VERIFY_NULLDUMMY;
    }

    if (DeploymentActiveAfter(pindex->pprev, consensusparams, Consensus::DEPLOYMENT_DYNA_FED)) {
        flags |= SCRIPT_SIGHASH_RANGEPROOF;
    }

    if (DeploymentActiveAfter(pindex->pprev, consensusparams, Consensus::DEPLOYMENT_SIMPLICITY)) {
        flags |= SCRIPT_VERIFY_SIMPLICITY;
    }

    return flags;
}