RBF + CPFP See also ../../protocol/transactions/quick-ref/rbf-cpfp.md for protocol-level details. This SKILL.md focuses on wallet implementation . Wallet-level RBF flow BIP125 replacement rules (simplified) For replacement of original : 1. R has higher absolute fee than O. 2. R has higher fee rate than O. 3. R does not add new unconfirmed inputs. 4. R replaces ≤ 100 conflicting txs (and their descendants). 5. R pays at least extra per added vbyte beyond O. Bitcoin Core 28.0 made full-RBF the default — even txs without opt-in signal (sequence ≥ 0xfffffffe) can be replaced. Wallet UX for RBF Us…