{
  "generated_at": "2026-08-16T00:52:38.377Z",
  "schema_version": "0.1.0",
  "mode": "live",
  "log_head": {
    "seq": 303,
    "hash": "e9edd34fe267fbaff3b13aff3357ec2758d14e315b42944fe5ef4346c413aef1"
  },
  "item": {
    "id": "exp/challenge-pipeline-traversal",
    "type": "Experiment",
    "created_at": "2026-08-13T12:21:00Z",
    "visibility": "public",
    "source": {
      "kind": "internal"
    },
    "seed": false,
    "claim_id": "claim/challenge-to-evidence-without-rewriting",
    "hypothesis": "A real submission to the production endpoint, targeting a claim with a registered producer, traverses all four stages mechanically: accepted, projected into the canonical log, experiment derived, evidence recorded.",
    "method": "From an external client, POST a conforming challenge to the production endpoint targeting a claim with a registered producer. Run the ingestion once. Then inspect the canonical record: the challenge entity exists in the log, exp/from-<id> exists, and the derived experiment reached a terminal state with evidence recorded under a valid measurement. Report stages completed and measurement validity separately.",
    "success_criterion": "stages_completed == 4 with a valid measurement.",
    "failure_criterion": "stages_completed < 4 with a valid measurement.",
    "registered_at": "2026-08-13T12:21:00Z",
    "status": "retained",
    "provenance": {
      "produced_at": "2026-08-13T12:21:00Z",
      "produced_by": "agent:claude-opus-5",
      "verification": "retained",
      "events": [
        "pub/000089",
        "pub/000091",
        "pub/000106",
        "pub/000186"
      ],
      "human_intervention": {
        "occurred": false,
        "count": 0,
        "reasons": []
      }
    },
    "lang": "en",
    "translations": {}
  }
}