ZK-Proof
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In Brief
A zero-knowledge proof (ZK-proof) is a cryptographic method that lets one party prove a statement is true without revealing any of the underlying information — used in blockchain for privacy and to scale networks via ZK-rollups.
What Is a ZK-Proof (Zero-Knowledge Proof)?
A zero-knowledge proof (ZK-proof) is a cryptographic technique that allows one party (the prover) to prove to another (the verifier) that a statement is true — without revealing any of the underlying data. In other words, you can prove you know a secret or that something is valid without disclosing the secret itself.
In blockchain, ZK-proofs power two major use cases: privacy (proving a transaction is valid without revealing its details) and scalability (verifying batches of transactions efficiently in ZK-rollups).
How Does a ZK-Proof Work?
A prover wants to convince a verifier that a statement is true.
The prover generates a cryptographic proof based on the secret information.
The verifier checks the proof — confirming validity without learning the secret.
The verifier becomes convinced the statement is true, with zero knowledge of the underlying data.
A classic analogy: proving you know the password to a door without ever saying the password out loud.
Properties of a Zero-Knowledge Proof
| Property | What It Means |
|---|---|
| Completeness | If the statement is true, an honest verifier is convinced |
| Soundness | A false statement can't be proven true (except negligibly) |
| Zero-knowledge | The verifier learns nothing beyond the statement's truth |
ZK-SNARKs vs ZK-STARKs
ZK-SNARKs — Succinct Non-interactive ARguments of Knowledge; small, fast to verify, but often require a "trusted setup."
ZK-STARKs — Scalable Transparent ARguments of Knowledge; no trusted setup and quantum-resistant, but produce larger proofs.
Why Do ZK-Proofs Matter in Crypto?
Scalability — ZK-rollups use ZK-proofs to verify thousands of transactions cheaply on Layer 1.
Privacy — prove a transaction is valid without exposing amounts or addresses.
Identity — prove facts about yourself (e.g. age) without revealing personal data.
Efficiency — verifying a proof is far cheaper than re-checking every transaction.
ZK-Proofs and Trust Wallet
ZK technology powers many of the Layer 2 networks Trust Wallet supports, helping deliver faster, cheaper, and more private transactions. As a non-custodial, multi-chain wallet covering 100+ blockchains, Trust Wallet lets you interact with ZK-rollups and other advanced networks while keeping full control of your private keys — putting cutting-edge cryptography to work for everyday users.