CPFP
A fee-bumping technique where a new transaction spends an unconfirmed output and pays a high fee to incentivize miners to include both.
CPFP lets a receiver (or sender) spend an unconfirmed output with a high-fee child, pulling the low-fee parent into a block as a package so miners collect enough total fees. Useful when the original transaction cannot be replaced via RBF.
- Some wallets expose CPFP as "accelerate" or "unstick"
- Works across chains that support package relay and mining
Related Terms
Fee Rate
→A fee expressed per unit of transaction size (e.g., satoshis per vbyte) used to prioritize inclusion in blocks.
Mempool
→A temporary storage space in a node for pending transactions that have not yet been included in a confirmed block.
Replace By Fee (RBF)
→A Bitcoin node policy (BIP125) allowing an unconfirmed transaction to be replaced by a new one that pays a higher fee.
Zero Confirmation
→Transactions that have been broadcast to the network but not yet included in a block.
All terms and definitions may update as the Cryptionary improves.
