PROOF Layer

Immutable Audit Trail — What Happened and Why

If it's not logged, it didn't happen. PROOF makes governance verifiable.

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What is PROOF?

The PROOF layer creates an immutable, tamper-evident record of every governance decision:

1. Capture — Record all governance data
2. Chain — Link records cryptographically
3. Store — Persist with integrity guarantees
4. Anchor — Commit hashes to blockchain
5. Verify — Enable independent verification

┌─────────────────────────────────────────────────────────────┐
│                        PROOF LAYER                          │
└─────────────────────────────────────────────────────────────┘

     ┌─────────────────────┐
     │  From ENFORCE       │
     │  Gate Decision      │
     └──────────┬──────────┘
                │
                ▼
     ┌─────────────────────┐
     │      CAPTURE        │──▶ Intent + Decision + Context
     └──────────┬──────────┘
                │
                ▼
     ┌─────────────────────┐
     │       CHAIN         │──▶ Hash + link to previous
     └──────────┬──────────┘
                │
                ▼
     ┌─────────────────────┐
     │       STORE         │──▶ Append-only, 7+ years
     └──────────┬──────────┘
                │
                │ High-risk records
                ▼
     ┌─────────────────────┐
     │   ANCHOR (Chain)    │──▶ Polygon blockchain
     └─────────────────────┘

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Why PROOF Matters

Without PROOF	With PROOF
"The agent did it"	Exact decision trail
Trust the operator	Verify independently
Logs can be altered	Cryptographically chained
Compliance theater	Auditable compliance
Disputes are "he said/she said"	Mathematical proof

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The Chain

Each record links to the previous, creating a tamper-evident chain:

┌─────────────┐    ┌─────────────┐    ┌─────────────┐
│  Record 1   │    │  Record 2   │    │  Record 3   │
│             │    │             │    │             │
│ hash: 0xabc │◀───│ prev: 0xabc │◀───│ prev: 0xdef │
│             │    │ hash: 0xdef │    │ hash: 0x123 │
└─────────────┘    └─────────────┘    └─────────────┘

If anyone modifies Record 2:
- Its hash changes
- Record 3's previousHash no longer matches
- Chain is broken → tampering detected

---

Proof Record Schema

interface ProofRecord {
  proofId: string;
  version: "1.2";
  
  // Chain
  hash: string;
  previousHash: string;
  sequenceNumber: number;
  
  // Temporal
  timestamp: string; // ISO8601
  
  // Subject
  agentId: string;
  sessionId: string;
  
  // Event
  eventType: "intent_evaluated" | "gate_decision" | "escalation_created" | "escalation_resolved";
  
  // Data
  data: Record<string, any>;
  
  // Integrity
  signature: string;
  
  // Anchoring (if applicable)
  anchor?: {
    network: "polygon";
    txHash: string;
    blockNumber: number;
  };
}

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API Endpoints

POST /v1/proof/log          # Log a record
GET  /v1/proof/{proofId}    # Get a record
GET  /v1/proof/verify/{id}  # Verify a record

---

Implementation Requirements

Requirement	Description
REQ-PRF-001	Log every governance decision
REQ-PRF-002	Chain records cryptographically
REQ-PRF-003	Sign records with agent key
REQ-PRF-004	Anchor HIGH risk to blockchain
REQ-PRF-005	Anchor within 60s of decision
REQ-PRF-006	Retain for 7+ years
REQ-PRF-007	Enable independent verification

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Enhanced Security (Optional)

Beyond the required linear hash chain, PROOF supports optional security enhancements:

Merkle Tree Aggregation

Batch verification for high-volume environments with O(log n) proof verification:

       ┌─────────────┐
       │ Merkle Root │
       │   0xabc...  │
       └──────┬──────┘
              │
     ┌────────┴────────┐
     │                 │
┌────▼────┐      ┌────▼────┐
│  Hash   │      │  Hash   │
│ 0x12... │      │ 0x34... │
└────┬────┘      └────┬────┘
     │                 │
 ┌───┴───┐        ┌───┴───┐
 │       │        │       │
┌▼┐     ┌▼┐      ┌▼┐     ┌▼┐
│P│     │P│      │P│     │P│
│1│     │2│      │3│     │4│
└─┘     └─┘      └─┘     └─┘

• External Anchoring: Ethereum, Polygon, RFC 3161 TSA
• Batch Windows: Configurable aggregation periods
• Inclusion Proofs: Verify individual record membership

Zero-Knowledge Proofs

Privacy-preserving trust attestation via Circom/Groth16:

ZK Claim Type	Description
score_gte_threshold	Prove score meets minimum without revealing actual value
trust_level_gte	Prove trust level without revealing exact score
decay_milestone_lte	Prove recent activity without revealing exact dates
chain_valid	Prove proof chain integrity
no_denials_since	Prove clean record without revealing history details

---

Tiered Audit System

PROOF supports three audit modes to balance transparency and privacy:

Mode	Description	Use Case
Full	Complete proof chain export	Regulatory compliance, legal discovery
Selective	Filtered, redacted disclosure	Partner due diligence, incident review
ZK	Zero-knowledge claims only	Privacy-preserving verification

// Example: Request ZK audit
const audit = await proof.requestAudit({
  mode: 'zk',
  claims: [
    { type: 'score_gte_threshold', threshold: 75 },
    { type: 'trust_level_gte', level: 2 },
    { type: 'no_denials_since', days: 30 }
  ]
});
// Returns: proofs without revealing actual scores/history

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Next Layer

For high-risk decisions, PROOF commits to CHAIN for blockchain anchoring.

[PROOF] ──high-risk proofs──▶ [CHAIN]