Definition. Rolling Max/Min 30D are the highest and lowest closes of the trailing 30 days (inclusive of the current bar). Range−30D (%) = (RollingMax30 − RollingMin30) ÷ RollingMax30 × 100, and the Compression Score = 100 − Range. The two are therefore exact complements, which is why the grey range line mirrors the coloured score line about 50%. Because a rolling extreme only changes when a new 30-day high or low is printed, the score moves as a staircase rather than a smooth curve — matching the reference chart.

Regimes. Expanded < 50 · Compression 50–75 · Strong compression 75–90 · Extreme compression ≥ 90. A squeeze alert marks a local maximum of the score that also clears 90, i.e. a 30-day coil that has stopped tightening — historically the point where a range expansion (and often a sharp move) follows. Alerts are detected on the loaded series, so they change if you change the source window.

Data. Yahoo Finance BTC-USD daily closes, written by btc-compression-update.py to .db_btc_compression.json and fetched by this page at load time. Daily bars only; the last bar is the current (incomplete) UTC day. Methodology follows the published CryptoQuant “Bitcoin 30D Price Compression Score” definition. Not investment advice.