An overview of the cluster mempool proposal

[hebasto]

@sdaftuar

This graph shows why various heuristics for whether a replacement should be taken are unsatisfactory. Instead, to ensure that a replacement is always better for miners, we propose making the RBF validation rule be that the mempool must get “strictly better” using this feerate diagram check in order to be accepted.

1. Without knowing a mempool ordering, is it possible for a wallet to construct an RBF transaction candidate that will be guaranteed to be accepted?

if not,

2. What kind of a mempool ordering data would be sufficient for a wallet to achieve such a goal?