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  "proofUrl": "https://spine-link.vercel.app/assets/library/w140102_spine-2026-07-28T23-57-28-044Z/source-proof.json?v=2026-07-28T23-57-28.044Z",
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      "platform": "Win32",
      "language": "en-US",
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      "deviceMemory": 32,
      "screen": {
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      "timezone": "America/Los_Angeles",
      "timezoneOffset": 420,
      "maxTouchPoints": 0,
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    "previewPath": "library/w140102_spine-2026-07-28T23-57-28-044Z"
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    "note": "Anchor proofHash on-chain together with the GitHub commit/file path to timestamp the original upload evidence."
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}