# Ocean6 local reference evidence — 20 Sep 2026

This is a self-published validation record of reference 0.2. The example is a synthetic shipping policy, not a customer case. It performs deterministic literal matching, not model inference. No remote Ocean6 node, GPU or payment is used.

## Reproduce
Requires Python 3.9+; cross-runtime checks also require Node.js. The exact tested environment is in report.json.

```sh
python3 test_reference.py
python3 test_cross_runtime.py
python3 reference_runtime.py run task.json result.json receipt.json
python3 reference_runtime.py verify task.json result.json receipt.json
python3 reference_runtime.py verify task.json modified-result.json receipt.json
```

The last command is expected to fail with REPLAY_MISMATCH and exit code 1. result.json contains two matching lines; the first match has score 2. modified-result.json changes that score to 9. Receipts are unsigned local records. Hashes and replay do not prove remote executor identity, trusted timestamps, model execution, payment, or original truth when all records are consistently replaced.

Rerunning overwrites result.json and receipt.json; receipt timestamps change. Preserve the downloaded files before reproducing if you wish to compare the original checksums. SHA256SUMS.txt checks file integrity relative to this publication, not independent publisher authenticity. Test files and logs are included for inspection.