Cascade autopsy: BTC, 2026-09-21 - $222.3M liquidated (n=1,478 tape events)

On 2026-09-21, our multi-venue tape recorded a BTC cascade: $222.3M in forced closes over 5 minutes (n=1,478 raw tape events in our own capture, not the whole market).

The liquidation map snapshot published 4 minutes before the start showed 23 levels; 10 were reached inside the cascade's traded range (n=23 levels, Wilson 95% lower bound 26%). Misses are shown at equal weight in the full autopsy.

The measured record as published that day: walk-forward precision 57.2% [Wilson 95% lower bound 33.3%], n=15 day-clusters.

Full re-verified anatomy (minute-by-minute timeline, before-map, venue breakdown): https://hunterkiller.io/autopsy/2026-09-21T0922-BTC

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