{
  "name": "Imports you can replay and undo",
  "durationSeconds": 16,
  "chapters": [
    {
      "start": 0,
      "end": 4,
      "narration": "Fingerprints and receipts make imports repeatable."
    },
    {
      "start": 4,
      "end": 8,
      "narration": "Unchanged exports must not change totals."
    },
    {
      "start": 8,
      "end": 12,
      "narration": "Replace and reset stay reversible."
    },
    {
      "start": 12,
      "end": 16,
      "narration": "Orphaned counts are treated as defects."
    }
  ]
}