Method CreateNewBlock

src/node/miner.cpp:126–244

}

std::unique_ptr<CBlockTemplate> BlockAssembler::CreateNewBlock()
{
    const auto time_start{SteadyClock::now()};

    resetBlock();

    pblocktemplate.reset(new CBlockTemplate());
    CBlock* const pblock = &pblocktemplate->block; // pointer for convenience

    // Add dummy coinbase tx as first transaction. It is skipped by the
    // getblocktemplate RPC and mining interface consumers must not use it.
    pblock->vtx.emplace_back();

    LOCK(::cs_main);
    CBlockIndex* pindexPrev = m_chainstate.m_chain.Tip();
    assert(pindexPrev != nullptr);
    nHeight = pindexPrev->nHeight + 1;

    pblock->nVersion = m_chainstate.m_chainman.m_versionbitscache.ComputeBlockVersion(pindexPrev, chainparams.GetConsensus());
    // -regtest only: allow overriding block.nVersion with
    // -blockversion=N to test forking scenarios
    if (chainparams.MineBlocksOnDemand()) {
        pblock->nVersion = gArgs.GetIntArg("-blockversion", pblock->nVersion);
    }

    pblock->nTime = TicksSinceEpoch<std::chrono::seconds>(NodeClock::now());
    m_lock_time_cutoff = pindexPrev->GetMedianTimePast();

    if (m_mempool) {
        LOCK(m_mempool->cs);
        m_mempool->StartBlockBuilding();
        addChunks();
        m_mempool->StopBlockBuilding();
    }

    const auto time_1{SteadyClock::now()};

    m_last_block_num_txs = nBlockTx;
    m_last_block_weight = nBlockWeight;

    // Create coinbase transaction.
    CMutableTransaction coinbaseTx;

    // Construct coinbase transaction struct in parallel
    CoinbaseTx& coinbase_tx{pblocktemplate->m_coinbase_tx};
    coinbase_tx.version = coinbaseTx.version;

    coinbaseTx.vin.resize(1);
    coinbaseTx.vin[0].prevout.SetNull();
    coinbaseTx.vin[0].nSequence = CTxIn::MAX_SEQUENCE_NONFINAL; // Make sure timelock is enforced.
    coinbase_tx.sequence = coinbaseTx.vin[0].nSequence;

    // Add an output that spends the full coinbase reward.
    coinbaseTx.vout.resize(1);
    coinbaseTx.vout[0].scriptPubKey = m_options.coinbase_output_script;
    // Block subsidy + fees
    const CAmount block_reward{nFees + GetBlockSubsidy(nHeight, chainparams.GetConsensus())};
    coinbaseTx.vout[0].nValue = block_reward;