Bitcoin Optech

Bitcoin Optech is the Bitcoin Operations Technology Group founded in 2018, years after Satoshi Nakamoto stopped posting, publishing technical explainers such as its time-warp attack page.

1 entries

Event January 9, 2009 Added June 1, 2026 Updated August 11, 2026 Analysis

Bitcoin's time-warp attack — Satoshi's 2016-block off-by-one and the Great Consensus Cleanup (2024–2026)

Satoshi Nakamoto

Satoshi's difficulty retarget has an off-by-one: it measures 2,015 blocks instead of 2,016. A hashrate majority can exploit it via timestamp manipulation. The Great Consensus Cleanup proposes a fix.