Notarization · Verifiable Attestations · Zero-Knowledge

Prove anything.
Reveal nothing.

Notarize documents, issue signed attestations, and verify claims independently — no central authority, no exposed data. Zero-knowledge selective disclosure is rolling out next.

See the Live Demo GitHub See How It Works

Document Notarization Signed Attestations (W3C-VC) Chain-Agnostic Anchoring Zero-Knowledge Proofs

liberproof / zkprover.js

Process

Three steps to sovereign proof

No raw data leaves your device. Every proof is mathematically verifiable. Every disclosure is exactly what you choose.

Step 01 / Issue

Credential Issued

A trusted issuer — government, institution, or protocol — signs a credential containing your attributes. The credential is stored locally, never on any server.

lp.attest({ subject, claim: { isOver18: true } })
→ signed attestation

→

Step 02 / Prove

Proof Generated

You select only what to prove. LiberProof generates a ZK-SNARK proof on-device — mathematically proving the statement without revealing the underlying data.

lp.notarize({ data, mimeType })
→ record.documentHash + proof

→

Step 03 / Verify

Claim Verified

Anyone — or any smart contract — can verify the proof is cryptographically valid. The verification confirms the claim is true. Nothing else is revealed.

lp.verify(attestation, issuerPublicKey)
→ { valid: true } // typical for Groth16 verification

Applications

What you can prove

Every proof reveals exactly what you intend — and nothing else. Signed attestations ship today; zero-knowledge selective disclosure is rolling out, starting with age-threshold.

Age Verification

Prove you're above an age threshold to access services, vote, or purchase — without revealing your date of birth or any identity document.

Prove age ≥ 18 · birthdate hidden

Agent Authorization

Prove an autonomous AI agent is authorized to spend — within the limits you set — without revealing the credential. Revoke it to lock the agent out instantly, at the identity layer.

Prove authorized-to-spend · see it live →

Citizenship & Jurisdiction

Prove you hold citizenship in a jurisdiction — qualifying you for services, contracts, or governance — without doxxing your identity or address.

Prove jurisdiction membership · identity hidden

Asset Thresholds

Prove your wallet holds above a required balance without revealing the amount — for DeFi access, DAOs, or collateral requirements.

Prove balance ≥ threshold · amount hidden

KYC Without KYC

Prove you've completed identity verification elsewhere — without sending your documents to every service that asks. One verification, infinite proofs.

Prove KYC passed · documents hidden

Credentials & Certifications

Prove you hold a license, degree, or certification — without revealing issuer details, GPA, or any personal data attached to the record.

Prove license valid · details hidden

Governance Eligibility

Prove you're eligible to vote or participate in governance without linking your on-chain identity to your real-world person — anonymous but verified.

Prove voter eligibility · identity hidden

Security Model

Cryptographic by design

The math does the work. Your raw data never leaves your device.

0 bytes

of raw data transmitted in a proof

A ZK-SNARK proof contains only a mathematical commitment — it encodes that a statement is true, with zero information about the underlying witness. The verifier learns nothing beyond the proven claim.

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Local Computation Only

Every proof is generated on your device using Groth16 circuits. No data is sent to any server during proof generation. The only thing that leaves your device is the compact, opaque proof and its public inputs.

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Groth16 Circuits

Groth16 is a pairing-based ZK-SNARK with constant proof size (~128 bytes) and sub-millisecond verification — typical for Groth16. Production signed attestations and notarization ship today; our zero-knowledge layer is in active development, with the age-threshold circuit live and more circuits expanding from there.

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On-Chain Anchoring

Proofs anchor on-chain today (EVM via calldata; Cardano rolling out as our launch chain) for tamper-evident timestamping — independently checkable by txHash on any block explorer. Native smart-contract verification is next on the roadmap.

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Open Source Circuits

Every circuit is open and auditable. The proving keys are derived from a transparent setup ceremony. Nothing is hidden in the cryptographic machinery.

🗝️

LiberVault Integration

LiberProof is wallet-agnostic (bring any secp256k1 / Ed25519 key) and pairs with LiberVault for wallet-held signing. Balance/ownership proofs are on the roadmap.

Ecosystem