{
  "video_id": "knaLhBVLRWg",
  "video_url": "https://www.youtube.com/shorts/knaLhBVLRWg",
  "observed_date_utc": "2026-10-06",
  "published_record_date": "2026-10-07",
  "scope": "One account, one 12-second Short, signed-in desktop Chrome; no synchronized phone/desktop/player recording.",
  "environment": {
    "os": "macOS 27.0.1",
    "browser": "Chrome",
    "browser_version": "UNKNOWN"
  },
  "b_save_click_utc": "2026-10-06T14:07:21.493Z",
  "observations": [
    {
      "observed_at_utc": "2026-10-06T14:08:20.531Z",
      "seconds_after_save_click": 59.038,
      "surface": "Studio details reopened",
      "observed_image": "B / TRIANGLE"
    },
    {
      "observed_at_utc": "2026-10-06T14:08:23.517Z",
      "seconds_after_save_click": 62.024,
      "surface": "Static channel Shorts card",
      "observed_image": "A / SQUARE"
    },
    {
      "observed_at_utc": "2026-10-06T14:08:56.891Z",
      "seconds_after_save_click": 95.398,
      "surface": "Static channel Shorts card revisited",
      "observed_image": "A / SQUARE"
    }
  ],
  "later_desktop_checks": [
    {
      "observed_at_utc": "2026-10-06T15:27:45.051Z",
      "surface": "Studio details",
      "observed_image": "A / SQUARE"
    },
    {
      "observed_at_utc": "2026-10-06T15:27:57.636Z",
      "surface": "Static channel Shorts card",
      "observed_image": "A / SQUARE"
    }
  ],
  "inputs": [
    {
      "image": "A",
      "url": "/shorts-samples/cover-input-a.png",
      "bytes": 189187,
      "width": 1080,
      "height": 1920,
      "sha256": "df291633555bb693404379f932a22ba614b4dcd28afdad0cebb7c0246069696f",
      "kind": "Original diagnostic input; not a YouTube screenshot"
    },
    {
      "image": "B",
      "url": "/shorts-samples/cover-input-b.png",
      "bytes": 211338,
      "width": 1080,
      "height": 1920,
      "sha256": "2ef4a2f21f7f1cd3d03b9033bf6136d3010043254b759b2662548580dd85b34a",
      "kind": "Original diagnostic input; not a YouTube screenshot"
    }
  ],
  "limits": [
    "Elapsed times are from Save click, not a measured server commit.",
    "A navigation warning delayed the first B card sample; A/B checkpoints were not matched.",
    "Shorts and Watch autoplay made the pre-play cover unobservable.",
    "No causal finding about caching or propagation delay.",
    "Save/readback observations do not establish crop geometry, CTR or ranking. A separate screenshot-based A-card crop estimate is in desktop-crop.json."
  ]
}