REPO — Each submission carries predictions_summary_hash, a deterministic…
Each submission carries predictions_summary_hash, a deterministic lowercase SHA-256 over a canonical serialisation of predictions joined on instance IDs; the pipeline recomputes and rejects mismatches, so published metrics cannot be silently altered from their predictions.
Source: puma-community README.md; wiki/Anonymity-And-Privacy.md · Traceability: corpus unit
SAT-004· Confidence: repo-backed