Protocol & Consensus • Estimated 40m

Time Warp Attack

protocol.time-warp-attack

Time warp attacks manipulate block timestamps across difficulty periods so miners can suppress or lower future difficulty despite faster block production. The exploit depends on Bitcoin's off-by-one retarget bug plus the consensus limits on miner-controlled time, so it sits at the intersection of retarget math and timestamp rules.

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Curated resources (4)

• Bitcoin Optech Topic: Time Warp (article) Canonical overview of the attack, why it matters, and the current mitigation discussion.
• BIP 54: Consensus Cleanup (article) Specification and motivation for fixing the time warp bug as part of the consensus cleanup bundle.
• Bitcoin Optech Newsletter #299 (article) Explains the off-by-one retarget bug and why it matters because it enables the time-warp exploit.
• Mastering Bitcoin (book) Broad technical reference for the mining, block-header, and consensus mechanics that make the exploit legible.

Direct prerequisites (2)

• Difficulty Adjustment
• Median Time Past

Direct dependents (0)

• None

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