BTC: Header-Time Dormancy — 90-Day Mean

Bitcoin Header-Time Dormancy — 90-Day Mean was 13.33 days on 7 Nov 2026 (latest daily value).

The 90-day simple mean of daily header-time dormancy, the value-weighted average age of spent BTC, in days.

Why use it. Smooth daily dormancy to follow the average age of spent BTC over a 90-day window. How to read it. Larger values mean older coins were spent on average. This is a mean of daily dormancy values, not pooled coin-days divided by pooled volume. Days without spending have undefined dormancy, and the mean needs all 90 adjacent inputs, so a missing or undefined day leaves a gap. Change and self-spending remain; these are spent BTC amounts, not holder identities. Only sealed days are defined; provisional sealed values keep their label and open days are unknown.

Calculation. Each day's dormancy weights the age of every spent output, max(0, spending-header timestamp minus creation-header timestamp), by its BTC value. Average 90 adjacent daily values with the 40-significant-digit Decimal engine and no float intermediates. Daily UTC observations come from retained canonical Bitcoin history on our own validated Bitcoin Core node; source holds, MTP closure, six-block finality and revisions pass through from the weakest input.