Method ChargeRandomFees

src/darksend.cpp:760–790

charge the collateral randomly - Darksend is completely free, to pay miners we randomly pay the collateral of users.

// charge the collateral randomly
//  - Darksend is completely free, to pay miners we randomly pay the collateral of users.
void CDarkSendPool::ChargeRandomFees() {
    if (fMasterNode) {
        int i = 0;

        for (const CTransaction& txCollateral : vecSessionCollateral) {
            int r = rand() % 1000;

            /*
                Collateral Fee Charges:

                Being that DarkSend has "no fees" we need to have some kind of cost associated
                with using it to stop abuse. Otherwise it could serve as an attack vector and
                allow endless transaction that would bloat Lux and make it unusable. To
                stop these kinds of attacks 1 in 50 successful transactions are charged. This
                adds up to a cost of 0.002Lux per transaction on average.
            */
            if (r <= 20) {
                LogPrintf("CDarkSendPool::ChargeRandomFees -- charging random fees. %u\n", i);

                CWalletTx wtxCollateral = CWalletTx(pwalletMain, txCollateral);

                // Broadcast
                if (!wtxCollateral.AcceptToMemoryPool(true)) {
                    // This must not fail. The transaction has already been signed and recorded.
                    LogPrintf("CDarkSendPool::ChargeRandomFees() : Error: Transaction not valid");
                }
                wtxCollateral.RelayWalletTransaction();
            }
        }
    }
}

//
// Check for various timeouts (queue objects, darksend, etc)