BTC: Difficulty: Eight-Day Change
Bitcoin Difficulty: Eight-Day Change was 0% on 7 Nov 2026 (latest daily value).
The percentage change in mining difficulty over the last eight days.
Why use it. Difficulty changes only at adjustments, about every two weeks, and follows hash rate with a lag: the eight-day change shows each adjustment's size for eight days after it and is zero in between. How to read it. Positive after an adjustment that raised difficulty (hash rate joined), negative after one that lowered it (miners switched off). Runs of negative values come with miner capitulation.
Calculation. 100 × (difficulty after the day's last block ÷ difficulty after the last block of the day eight UTC days earlier − 1). Computed by CryptoKeyhole from its own Bitcoin node: block heights, header times and difficulty. Periods are UTC hours or days by block header time, and each value describes the chain after the period's last block; a period without a block has no value and the open period is partial.