Mempool Pinning
A tactic that makes an unconfirmed transaction difficult to replace or fee-bump, delaying confirmation.
Mempool pinning occurs when transaction relationships or policy limits prevent effective RBF or CPFP. This can keep a transaction stuck even if participants try to bump fees.
- Use simple change structures and avoid unnecessary dependencies
- Prefer wallets aware of package relay and pinning risks
Related Terms
Mempool
→A temporary storage space in a node for pending transactions that have not yet been included in a confirmed block.
CPFP
→A fee-bumping technique where a new transaction spends an unconfirmed output and pays a high fee to incentivize miners to include both.
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.
Package Relay
→The ability for nodes to relay groups of related transactions together so miners evaluate fees on the package total.
All terms and definitions may update as the Cryptionary improves.
