BTC: Mining Difficulty — 40-Day Mean

Bitcoin Mining Difficulty — 40-Day Mean was 139,187,294,376,777.14 difficulty on 7 Nov 2026 (latest daily value).

Unweighted mean of the latest 40 UTC daily relative-difficulty observations, including the plotted day.

Why use it. Compare the difficulty trend across daily observation windows rather than individual retarget steps. How to read it. Every day has equal weight; this is not a block-count- or time-weighted mean. The daily value follows the highest canonical block height assigned to that UTC day, even if header time regresses. Missing input days or fewer than 40 observations leave a gap. A partial input makes the window partial; the mean does not certify completion.

Calculation. Use local canonical compact-target difficulty, retained as a native floating-point estimate relative to difficulty one. Select daily final-block snapshots, carrying a prior snapshot only across proved empty days. Apply sma(a,40) with 40-digit Decimal rounding to the 40 daily observations. This is difficulty, not raw hashes or measured miner capacity; published history and source finality remain authoritative.