A few days ago, a new version of the most widely used Bitcoin implementation, Bitcoin Core, was released. Version 24.0 includes the configuration “mempoolfullrbf”, which has already been the subject of lively discussion within the Bitcoin community for several weeks, in addition to numerous other undisputed updates.
At issue is the replace-by-fee (RBF) feature, a mempool policy that allows nodes to decide between competing unconfirmed transactions based on the fee rate.
RBF allows senders to replace an unconfirmed transaction in the mempool with another transaction. This is provided that there is at least one of the same inputs and pays a higher transaction fee.
This way, the creator of a transaction can expedite it if it is stuck in the mempool. Until the upgrade, it was the case that RBF was an opt-in feature.
With Bitcoin Core 24, this is changing as RBF will no longer be optional, but the default. Bitcoin Core has used…
