What is proof of work?
Proof of work is the rule that a Bitcoin block is only valid if its hash is below a target, which can only be achieved by spending energy on a very large number of attempts.
How it works
Anyone can check the result with a single hash, while producing it takes trillions. The chain with the most accumulated work is the one nodes accept.
Why it matters
It is what makes rewriting Bitcoin's history expensive, and it is the job miners are paid to do.
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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