Claims follow a simple structure:

claim = {
  claim_type,        // e.g. "over_18", "lives_in_eu"
  proven_by,         // attribute reference
  proof,             // ZK or attestation
  timestamp
}

Claims can be:

• Local proofs (generated in the Vault)
• Attested proofs (signed by trusted institutions)
• Hybrid proofs (attribute + external attestation)