{
  "contract": "cblaketahoe.property.photo-provenance/v1",
  "linear": "TAH-266",
  "verified_at": "2026-09-20T21:38:51Z",
  "listing": {
    "mls": "20260785",
    "slug": "1315-commonwealth-drive",
    "source_email_date": "2026-08-08",
    "source_guid": "46bef667-4aab-4557-ae58-8464544261b5",
    "source_count": 28,
    "retained_count": 28
  },
  "status": "source_proven",
  "method": {
    "source": "Exact Paragon publink reached from the Aug. 8 market-alert email; report exposes 28 ordered zimg source URLs.",
    "retained": "https://photos.cblaketahoe.com/20260785/{0..27}.jpg",
    "verification": "All 28 source and retained positions returned HTTP 200. Same-index decoded-image normalization to 96x72 RGB produced mean absolute pixel error <= 1.209/255 at every position; each position was its own unique best match except the source-authentic duplicate pair 22/24, which tied exactly.",
    "source_duplicate_positions_zero_based": [
      22,
      24
    ],
    "interpretation": "The duplicate is present in the exact Paragon source and therefore is not cross-listing contamination."
  },
  "source_positions": [
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      "index": 0,
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      "normalized_rgb_mae_0_255": 1.209,
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}