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Zero-Knowledge Identity Verification

Developing ZK-SNARKs for multi-chain identity verification without cross-chain dependencies.

Dr. Anna Krasnov et al. - 2025

Abstract

This paper introduces a novel ZK-SNARK-based framework for identity verification without exposing sensitive personal information while maintaining cryptographic assurance across distributed systems.

Key Contributions

  • Multi-party identity attestation protocols with zero-knowledge proofs
  • Privacy-preserving verification of credentials without identity exposure
  • Cross-chain ZK verification systems for DID resolution
  • Formal validation of verification correctness through Coq proofs

Implementation

Our solution combines:

  • Circom: Custom identity verification circuits
  • Trusted Setup: MPC ceremonies for secure parameters
  • Blockchain: Cross-chain DID interoperability 
// Zero-knowledge identity circuit
template IdentityVerification() {
    signal private input user_credential;
    signal public output valid;

    component zkp = ZkProof();
    
    constraint zkp.prove(user_credential) === valid;
}

// Verification optimization
function optimize_identity_proof(proof) {
    return verify(proof.compress(0.98));
}
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