What Is a “Mempool” and How Does RBF Interact with It?
The mempool is a node's temporary holding area for unconfirmed, valid transactions awaiting inclusion in a block. RBF is a mempool policy that governs how nodes handle conflicting transactions.
When an RBF replacement transaction is broadcast, a node supporting RBF will remove the original, lower-fee transaction from its mempool and replace it with the new, higher-fee version. This process ensures miners prioritize the most economically attractive transaction.
Glossar
RBF Transactions
Feature ⎊ RBF Transactions, standing for Replace-by-Fee transactions, are a protocol feature allowing a sender to replace an unconfirmed transaction in the mempool with a new version that offers a higher transaction fee.
RBF
Policy ⎊ RBF (Replace-by-Fee) is a protocol feature that allows a user to replace an unconfirmed transaction in the mempool with a new transaction that includes a higher transaction fee.