{
  "schema": "TST001_MUTATION_RECEIPT_v1",
  "lesson_id": "TST-001",
  "lab_id": "TST001-LAB1",
  "attempt_id": "<generated>",
  "challenges": [
    {
      "challenge_id": "<opaque-id>",
      "outcome": "DETECTED|SURVIVED",
      "execution_timestamp": "<generated>"
    }
  ]
}