Conceptual on-chain structure that will anchor every audit's integrity proof.

AuditProof {
  auditId       u64       // unique scan identifier
  targetHash    bytes32   // sha256 of canonical target representation
  reportHash    bytes32   // sha256 of full report payload
  evidenceHash  bytes32   // merkle root of evidence artifacts
  auditor       address   // signing entity (audit-center key)
  timestamp     u64       // unix seconds
  riskScore     u16       // 0-100
  valid         bool      // verification status
}