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CPFP (child pays for parent)
Child pays for parent (CPFP) is a way to speed up a stuck Bitcoin transaction by spending one of its unconfirmed outputs in a new transaction that pays a high fee. Miners weigh the two together, so the new child's fee pays for including its low-fee parent.
What it means for you. CPFP can be used by anyone who controls an output of the stuck transaction, so a recipient can speed up an incoming payment, or a sender can use their own change output. It adds a second transaction's worth of bytes, so the extra fee has to cover both the child and the parent.
Sources: Bitcoin Core 0.13.0 release notes (ancestor feerate mining), BIP-141: Segregated Witness (virtual size), BIP-125: Opt-in Full Replace-by-Fee Signaling · checked 4 October 2026
Replace-by-fee
Replace-by-fee (RBF) is a Bitcoin feature that lets a sender replace an unconfirmed transaction with a new version paying a higher fee. Described in BIP 125, it lets a payment stuck with too low a fee be pushed through faster. The replacement must pay at least the original fee plus more.
What it means for you. If your bitcoin transaction is stuck, a wallet with RBF can raise its fee instead of waiting. The same feature means an unconfirmed incoming payment can still be replaced by the sender, so a zero-confirmation payment is not settled.
Source: BIP 125: Opt-in Full Replace-by-Fee Signaling · checked 4 October 2026