{
  "id": "v03-leaf-payload-rejects-ecr",
  "chapter": "02",
  "title": "leaf payload refuses a non-loggable prefix (ecr_ is institutional-only, never anchored)",
  "check": "leaf_payload",
  "input": {
    "leaf": {
      "receipt_id": "TR_AB12CD34EF56",
      "prefix": "ecr",
      "sha256": "AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA",
      "issued_at": "2026-07-04T00:00:00Z"
    }
  },
  "expect": {
    "verdict": "fail"
  }
}