Cryptionary
Term

Mempool Pinning

A tactic that makes an unconfirmed transaction difficult to replace or fee-bump, delaying confirmation.

Type:
mempool
security
1
definition

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.

2
mitigation
  • Use simple change structures and avoid unnecessary dependencies
  • Prefer wallets aware of package relay and pinning risks

All terms and definitions may update as the Cryptionary improves.