Zero-Knowledge Proof

A zero-knowledge proof lets one party prove that a statement is true without revealing the information behind it. A wallet could show it holds enough funds without disclosing its balance, or a rollup could prove thousands of transactions were executed correctly without republishing them all. A usable proof must convince an honest verifier, must be infeasible to fake for a false statement, and must leak nothing beyond the fact itself. In crypto, zero-knowledge proofs — often shortened to ZK proofs — power privacy tools, identity attestations and scaling systems where verifying is far cheaper than re-executing. They are mathematics, not anonymity by default: how much privacy you get depends on the circuit, the setup and how the surrounding application handles data.