What is a nonce?
The nonce is the field in a Bitcoin block header that miners change, over and over, to produce a different hash each time.
How it works
It is 32 bits, so it offers about 4.3 billion values, which a modern machine exhausts in a fraction of a second. Miners then change the extra nonce inside the coinbase transaction, or the timestamp, and start again.
Why it matters
Mining is the search for a nonce that gives a hash below the target. There is no shortcut; the only method is to try.
Related terms
All terms: the Bitcoin mining glossary.
Mining Disrupt 2027 tickets and passesMining Disrupt 2027 agendaMining Disrupt 2027 FAQ
Three days. One floor. The whole industry.
March 22–24, 2027 · Irving Convention Center · Dallas
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