# PactVerity Internal Security Review v1

**Status:** Internal engineering review — not an independent audit  
**Review date:** 5 August 2026  
**Scope:** Proof Engine v1, Receipt API beta, receipt verification, optional Solana message-signature verification, public receipt activity endpoint, protocol simulator, and published Solana audit-candidate source.

## Security properties reviewed

- Strict input schemas, bounded JSON bodies and UTF-8 validation.
- Deterministic integer-based SLA checks and canonical receipt hashing.
- Tamper detection for receipt payloads, checks and outcomes.
- Strict Ed25519 verification for optional Solana wallet signatures.
- No custody, token spending, settlement or seed-phrase collection.
- Anonymous public activity records that omit agreement, evidence and wallet details.
- Clear separation between simulations, submitted evidence and real customer claims.

## Automated verification

The repository includes executable tests for deterministic receipt creation, breached criteria, tamper detection, malformed and oversized inputs, canonical timestamps, Ed25519 signing, forged signatures and low-order-key rejection. On 5 August 2026, the production build, artifact validation and all 24 automated tests passed before publication.

## Known limitations

- This review was performed by the project team and is not independent assurance.
- User-supplied evidence can be false; the current engine proves consistency, not truth.
- The public activity ledger counts voluntary hash-deduplicated submissions, not unique people or customers.
- Solana sale and escrow candidates are not deployed and have not received an independent program audit.
- No bug bounty or formal external vulnerability-reporting service is active.

## Required independent-audit deliverables

An external auditor must independently review the deployed source revision, reproduce the build, test receipt canonicalization and signature handling, review D1 data minimisation, assess API abuse controls, and—before any value-bearing Solana program launches—perform a full Anchor/Solana program and economic-security audit. Findings and remediation status must be published.