# Contract Evidence Review

**SKU:** CAIN-A75-044  
**Development:** #44 Evidence-based construction change orders  
**Product status:** DELIVERABLE  
**Engine:** `contract_evidence` (`cain_a75_engines/contractevidence/engine.py`)  
**Profile:** `rock_excavation_change`  
**Generated:** 2026-11-12T07:59:12Z UTC

## Result

VERIFIED: item arithmetic, clause references, signed evidence and role approvals recomputed; 15/15 change-order-failure cases as expected

- **rock_excavation_change**: VERIFIED
- **honest_change_order**: SOUND
- **item_without_evidence**: UNSOUND
- **unsigned_evidence**: UNSOUND
- **missing_required_role**: UNSOUND
- **self_approved**: UNSOUND
- **approval_before_request**: UNSOUND
- **approval_limit_exceeded**: UNSOUND
- **unknown_clause**: UNSOUND
- **arithmetic_mismatch**: UNSOUND
- **overage_exceeded**: UNSOUND
- **duplicate_item**: UNSOUND
- **claim_overstates**: UNSOUND
- **unknown_claim**: UNSOUND
- **wrong_schema**: UNSOUND
- **garbage**: UNSOUND

## Limits of this run

Reviews the change-order record. It does not visit the site, prove evidence is authentic, or interpret the contract. The run is Ed25519-signed; pin the issuer key out of band.

This is a bounded run on a sample. It is not an assessment of any production system, not a
certification, and not a signed attestation. The accompanying `manifest.json` records SHA-256
hashes so a recipient can detect a changed file. The manifest is not a signature and not an
attestation; it does not prove who produced the artifact.

## What this is not

- Not a vendor integration, partnership or endorsement.
- Not legal, tax, clinical, insurance or safety advice.
- Not a third-party audit, SOC 2 report, ISO certification or patent filing.
- Not a production write action: no downstream tool was called.

Prices and packaging are proposals. Built by a three-person team.