BTC: Mean Block Interval Minus 600 Seconds

Bitcoin Mean Block Interval Minus 600 Seconds was 44.05 seconds on 7 Nov 2026 (latest daily value).

How many seconds longer or shorter than 10 minutes Bitcoin's average block interval was each day.

Why use it. Blocks come faster when hash rate grows faster than difficulty and slower when miners leave, so the gap shows which way the next difficulty adjustment will go. How to read it. Positive means blocks were slower than the target, negative faster, zero exactly on target. Single days are noisy; read the run of days.

Calculation. Limits: block times come from the timestamps miners write into block headers. Exact definition: Each UTC day's mean signed block interval minus 600 seconds, keeping the sign of the difference. Positive values mean the day's mean interval was longer than 600 seconds (slower blocks), negative values shorter (faster blocks), and zero exactly 600. Full closed UTC days only, with no carry across missing inputs; canonical ancestry, source revisions, publication holds and weakest-input finality are inherited from the parent. a - 600, where a is the daily mean signed block interval in seconds from our own validated Bitcoin Core node. No absolute value or smoothing is applied, so the sign shows the direction of the difference. Uses the existing 40-digit Decimal formulas.