{
  "utterance_id": "UTT-01",
  "text_version": "TXT-v3",
  "audio_text_version": "TXT-v3",
  "token_id": "tok-07",
  "char_start": 42,
  "char_length": 9,
  "audio_asset_ref": "tts-A-v3.wav",
  "timing_source": "UNKNOWN",
  "start_ms": 1380,
  "end_ms": 1810,
  "elapsed_ms": 1380,
  "confidence": 0.94,
  "cue_id": "cue-02",
  "drift_ms": 52,
  "sync_state": "UNKNOWN",
  "fallback_mode": "NONE",
  "review_owner": "speech-qa",
  "timebase": "AUDIO_START_MS",
  "browser_boundary_supported": true,
  "browser_boundary_granularity": "WORD",
  "boundary_fields_supported": true,
  "alignment_available": true,
  "segment_requires_fallback": false
}