Glossary

Zero-Knowledge Proof

Plain-language definition Crypto glossary

Key takeaways

A zero-knowledge proof is a cryptographic method that lets one party prove a statement is true to another without revealing anything beyond the fact that it is true.
The "prover" convinces the "verifier" they know or satisfy something without disclosing the underlying data, and modern schemes can compress this into a small proof that is quick to check.
Zero-knowledge proofs power two big trends in crypto: privacy, by proving things without exposing data, and scaling, since zero-knowledge rollups bundle many transactions into one succinct validity proof.

Definition

A zero-knowledge proof is a cryptographic method that lets one party prove to another that a statement is true without revealing anything beyond the fact that it is true.

How it works

The “prover” convinces the “verifier” they know or satisfy something — a password, a balance, the validity of a batch of transactions — without disclosing the underlying data itself. The verifier ends up confident the claim is correct while learning none of the secret details. Modern schemes can compress this into a small proof that is quick to check.

Why it matters

Zero-knowledge proofs power two big trends in crypto: privacy, by letting users prove things without exposing data, and scaling, since zero-knowledge rollups bundle many transactions into one succinct validity proof posted to a base chain.

Example

A zero-knowledge rollup proves thousands of transactions are valid with a single proof, without replaying each one on the main chain.

FAQ

Frequently asked questions

How can you prove something without revealing it?

In a zero-knowledge proof, the prover convinces the verifier that a statement is true, such as knowing a password or that a batch of transactions is valid, without disclosing the underlying data. The verifier ends up confident the claim is correct while learning none of the secret details.

How do zero-knowledge proofs help blockchains scale?

Zero-knowledge rollups bundle many transactions together and prove they are all valid with a single succinct proof posted to a base chain. This compresses a large amount of activity into one small, quick-to-check proof, easing the load on the underlying network.

What are zero-knowledge proofs used for in crypto?

They power two main trends: privacy, by letting users prove things without exposing their data, and scaling, through zero-knowledge rollups that bundle many transactions into one validity proof. Both rely on the same ability to prove a claim is true while revealing nothing extra.