Network, Relay & Client Sync • Estimated 40m

Replacement Cycling

protocol.replacement-cycling

Replacement cycling repeatedly uses RBF and CPFP to evict a time-sensitive multiparty transaction from the mempool, preventing its confirmation while the attacker can afford to keep cycling replacements.

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Curated resources (3)

• Bitcoin Optech: Replacement Cycling (article) Explains the repeated RBF-and-CPFP eviction attack and its impact on contract protocols.
• Bitcoin Optech: Transaction Pinning (article) Context for the wider family of fee-bumping and confirmation-blocking attacks.
• Mastering Bitcoin (book) Background on fee bumping, transaction packages, and mempool policy.

Direct prerequisites (2)

• Child Pays for Parent (CPFP)
• Replace-by-Fee (RBF)

Direct dependents (0)

• None

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