Cascade autopsy: BTC, 2026-09-21 - $133.5M liquidated (n=5,233 tape events)

On 2026-09-21, our multi-venue tape recorded a BTC cascade: $133.5M in forced closes over 7 minutes (n=5,233 raw tape events in our own capture, not the whole market).

The liquidation map snapshot published 3 minutes before the start showed 28 levels; 12 were reached inside the cascade's traded range (n=28 levels, Wilson 95% lower bound 27%). Misses are shown at equal weight in the full autopsy.

The measured record as published that day: walk-forward precision 58.9% [Wilson 95% lower bound 35.5%], n=16 day-clusters.

Full re-verified anatomy (minute-by-minute timeline, before-map, venue breakdown): https://hunterkiller.io/autopsy/2026-09-21T0831-BTC

Descriptive record of a past event - not a forecast and not a trade signal.