Function GetBlockScriptFlags

src/validation.cpp:1787–1836

}

static unsigned int GetBlockScriptFlags(const CBlockIndex* pindex, const Consensus::Params& consensusparams) {
    AssertLockHeld(cs_main);

    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
    {
        flags |= SCRIPT_VERIFY_P2SH;
    }

    // Enforce WITNESS rules whenever P2SH is in effect (and the segwit
    // deployment is defined).
    if (flags & SCRIPT_VERIFY_P2SH && IsScriptWitnessEnabled(consensusparams)) {
        flags |= SCRIPT_VERIFY_WITNESS;
    }

    // Start enforcing the DERSIG (BIP66) rule
    if (pindex->nHeight >= consensusparams.BIP66Height) {
        flags |= SCRIPT_VERIFY_DERSIG;
    }

    // Start enforcing CHECKLOCKTIMEVERIFY (BIP65) rule
    if (pindex->nHeight >= consensusparams.BIP65Height) {
        flags |= SCRIPT_VERIFY_CHECKLOCKTIMEVERIFY;
    }

    // Start enforcing BIP68 (sequence locks) and BIP112 (CHECKSEQUENCEVERIFY) using versionbits logic.
    if (VersionBitsState(pindex->pprev, consensusparams, Consensus::DEPLOYMENT_CSV, versionbitscache) == ThresholdState::ACTIVE) {
        flags |= SCRIPT_VERIFY_CHECKSEQUENCEVERIFY;
    }

    if (IsNullDummyEnabled(pindex->pprev, consensusparams)) {
        flags |= SCRIPT_VERIFY_NULLDUMMY;
    }

    if (IsBTGHardForkEnabled(pindex->pprev, consensusparams)) {
        flags |= SCRIPT_VERIFY_STRICTENC;
    } else {
        flags |= SCRIPT_FORKID_DISABLED;
    }

    return flags;
}