How Does “Replace-by-Fee” (RBF) Impact a Miner’s Transaction Selection Process?

Replace-by-Fee (RBF) is a feature that allows a user to replace an unconfirmed transaction in the mempool with a new transaction that pays a higher fee. RBF impacts a miner's selection process by allowing them to prioritize the higher-fee replacement transaction over the original one.

This mechanism increases fee revenue for miners and provides users with a way to speed up a stuck transaction by increasing the fee, especially during periods of high congestion.