zero-knowledge proof
A way to prove something is true without revealing how you know it.
A zero-knowledge proof is a cryptographic method that lets one person (the prover) convince another person (the verifier) that a statement is true, without sharing any information beyond that the statement is true. Think of it like proving you know a password without typing it.
These proofs exist because privacy and security often conflict—you may need to prove eligibility for something without exposing sensitive details like income, location, or identity. Zero-knowledge proofs are used in privacy-focused cryptocurrencies, financial systems that need confidentiality, and authentication systems. When you see this term in headlines, it usually signals that a technology is trying to solve the problem of verification without disclosure—letting systems confirm facts while protecting personal data.
Written once as a plain-English reference, not as advice. Nothing here is a recommendation to buy or sell anything.