Glossary
Proof of work
Proof of work secures a blockchain by making miners spend computing power to add blocks.
Miners repeatedly hash block data until they find a result below a target. Rewriting history would mean redoing that work faster than the honest network. Bitcoin uses SHA-256; Dogecoin uses Scrypt.
See it in the timelines
Updated
Sources
Facts written in our own words. Last checked Oct 14, 2026.