27 Nov '15, 4pm

Opt-in Full-RBF just got merged into Bitcoin Core: https://t.co/Aj4Js35viD

So, you mean the scenario where we have a high fee-rate transaction that is spent by one or more low fee-rate transactions? For instance suppose we have two transactions in our mempool: tx1a, 1KB w/ 1mBTC fee, which is spent by tx2, 10KB w/ 1mBTC fee. We get tx1b, 10KB w/ 2.1mBTC fee. Since the overall feerate of tx1b is higher than tx1a+tx2, it'll be accepted, even though a miner might have rather mined tx1a instead, ignoring tx2 (for now). I agree that's less than optimal. If we make the assumption that there's always more demand for blockchain space than supply, it might be reasonable for the replacement logic criteria to be whether or not we're increasing the fee-rate of any subset of the mempool. (while still paying more fees than the replaced transactions) Without taking CPFP into account, you could simply use the same kind of priority heap logic as in CreateNewBlock...

Full article: https://github.com/bitcoin/bitcoin/pull/6871#event-476297575

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