BTC: Cumulative Opportunity Bank — Since August 2010

Bitcoin Cumulative Opportunity Bank — Since August 2010 was 63,137,716.01 USD-days/BTC on 7 Nov 2026 (latest daily value).

The HODL bank behind Bitcoin's Reserve Risk: the running total since 20 August 2010 of each day's price minus the 30-day median of the price times supply-adjusted coin days destroyed, in USD-days per bitcoin.

Why use it. Reserve Risk divides the price by this bank: a large bank and a low price mean long-term holders are confident and the price is cheap against that confidence. How to read it. The bank grows while old coins stay put and shrinks when they move heavily. It is a running total that never restarts; days before 20 August 2010 are not counted.

Calculation. Exact definition: Running sum since 2010-08-20 of the signed daily opportunity component: price minus the 30-day median of price-weighted supply-adjusted CDD. Daily only, in USD-days per BTC. The bank starts on 2010-08-20, inclusive; earlier opportunity is excluded, not inserted as zero. Negative contributions stay negative and the bank is not clamped. Missing or invalid input in any required window leaves that day and all later values unknown until repaired; the sum never resets after a gap or with a narrower viewport. Change and self-transfers remain in CDD, and spending does not establish sales or holder conviction. Open days are null; six-block finality propagates. Cumulative sum of the daily opportunity component: the day's ending USD/BTC quote times one day, minus the 30-day moving median of quote times supply-adjusted CDD. Supply-adjusted CDD divides coin-days destroyed (spent BTC times max(0, spending minus creation header time)/86400) by actual cumulative issued BTC, in days. The median uses exactly 30 adjacent UTC days including the output day; the first component, 2010-08-20, uses 2010-07-22 through 2010-08-20. Quotes follow the admitted D+1 00:00 UTC convention; arithmetic is 40-significant-digit Decimal.