{
  "tool": "OpenAI built-in image generation",
  "imageFile": "bay-city-illustration.png",
  "createdDate": "2026-09-08",
  "revisedDate": "2026-09-08",
  "referenceRole": "Revised model render",
  "referenceFile": "bay-city-model-three-quarter.png",
  "referenceFiles": [
    "bay-city-model-three-quarter.png"
  ],
  "historicalStatus": "AI-generated interpretive artwork; not documentary evidence or an exact GLB render",
  "generationPrompt": "Bay City in ORIGINAL1857–1869 wooden BRIG sailing form. Exactly TWO tall square-rigged masts, three square sails per mast, widest courses tapering upward, aft gaff spanker and forward headsails exactly as reference. Cream canvas. Gentle fresh breeze and blue Lake Huron water, low sandy wooded distant shore, scattered sunlit clouds. Do not shorten spars or replace with schooner rig. Use the supplied GLB render as primary geometry reference, preserving complete silhouette, proportions, all mastheads, exact number of masts/funnels, cabin and deck fittings. Landscape full ship three-quarter view, detailed interpretive museum historical scene with lake background, plausible period construction. No text, no lettering, no name boards, no guns, no weapons, no cannon, no watermark. Deck windlasses are short transverse winch drums wound with rope, not gun barrels. No floating parts or extra masts. No wood grain on steel or iron; no orange rust on wooden hulls. No modern electronics or synthetic yellow lines. No invented ships.",
  "imageSha256": "83473b1dd424fb67ca6ff07ddc81943d85f5c26b3ddc4a7b33680e37c82513ee",
  "artefactCheck": {
    "date": "2026-09-08",
    "crops": [
      "bow",
      "midships",
      "stern",
      "rig-superstructure"
    ],
    "nativePixelInspection": true,
    "result": "regenerated",
    "imageSha256": "83473b1dd424fb67ca6ff07ddc81943d85f5c26b3ddc4a7b33680e37c82513ee",
    "observations": "Four native-pixel crops inspected. No weapons, garbled lettering, material mismatch, added masts, disconnected fittings or modern equipment observed. Interpretive details and background scenery are not documentary evidence."
  }
}