What is SHA-256?
SHA-256 is the hash function Bitcoin mining uses. It turns any input into a 256-bit number that cannot be predicted without computing it.
How it works
Bitcoin hashes each block header twice with SHA-256. Changing a single bit of the header changes the output completely, so the only way to find a low enough hash is to keep trying inputs.
Why it matters
ASIC miners are machines that do this one calculation as cheaply as possible. Other coins that use SHA-256 can be mined by the same hardware.
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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