What is difficulty adjustment?
The difficulty adjustment is Bitcoin's automatic reset of mining difficulty every 2,016 blocks, roughly every two weeks.
How it works
Each node compares how long the last 2,016 blocks took with the two weeks they should have taken. If they came faster, difficulty rises by the same proportion; if slower, it falls. A single adjustment cannot move by more than a factor of four in either direction.
Why it matters
It is why adding machines to the network does not produce more bitcoin. Miners watch the forecast because it tells them what their revenue will do on the day the adjustment lands.
Live figures: Next difficulty adjustment forecast.
Related terms
All terms: the Bitcoin mining glossary.
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