Method IsCollateralValid

src/darksend.cpp:954–1004

check to make sure the collateral provided by the client is valid

// check to make sure the collateral provided by the client is valid
bool CDarkSendPool::IsCollateralValid(const CTransaction& txCollateral) {
    if (txCollateral.vout.size() < 1) return false;
    if (txCollateral.nLockTime != 0) return false;

    int64_t nValueIn = 0;
    int64_t nValueOut = 0;
    bool missingTx = false;

    for (const CTxOut o : txCollateral.vout) {
        nValueOut += o.nValue;

        if (!o.scriptPubKey.IsNormalPaymentScript()) {
            LogPrintf ("CDarkSendPool::IsCollateralValid - Invalid Script %s\n", txCollateral.ToString().c_str());
            return false;
        }
    }

    for (const CTxIn i : txCollateral.vin) {
        CTransaction tx2;
        uint256 hash;
        if (GetTransaction(i.prevout.hash, tx2, Params().GetConsensus(), hash)) {
            if (tx2.vout.size() > i.prevout.n) {
                nValueIn += tx2.vout[i.prevout.n].nValue;
            }
        } else {
            missingTx = true;
        }
    }

    if (missingTx) {
        if (fDebug) LogPrintf ("CDarkSendPool::IsCollateralValid - Unknown inputs in collateral transaction - %s\n", txCollateral.ToString().c_str());
        return false;
    }

    //collateral transactions are required to pay out DARKSEND_COLLATERAL as a fee to the miners
    if (nValueIn - nValueOut < DARKSEND_COLLATERAL) {
        if (fDebug) LogPrintf ("CDarkSendPool::IsCollateralValid - did not include enough fees in transaction %d\n%s\n", nValueOut - nValueIn, txCollateral.ToString().c_str());
        return false;
    }

    if (fDebug) LogPrintf("CDarkSendPool::IsCollateralValid %s\n", txCollateral.ToString().c_str());

    CValidationState state;
    bool* pfMissingInputs = nullptr;
    if (!AcceptableInputs(mempool, state, txCollateral, false, pfMissingInputs)) {
        if (fDebug) LogPrintf ("CDarkSendPool::IsCollateralValid - didn't pass IsAcceptable\n");
        return false;
    }

    return true;
}


//