{
  "tool": "Built-in image generation",
  "imageFile": "marquette-illustration.png",
  "createdDate": "2026-09-07",
  "referenceRole": "Newly authored GLB three-quarter render used as visual reference",
  "referenceFile": "marquette-model-three-quarter.png",
  "historicalStatus": "Supplemental interpretive artwork, not documentary evidence or an exact GLB render",
  "generationPrompt": "Create a richly detailed realistic maritime reconstruction illustration of the wooden schooner Marquette, built Detroit in 1869, official number 90142, lost 1872. This is the small SAILING schooner, not the later steamer with the same name. Follow the attached newly authored 3D reconstruction render: 139 foot warm brown wooden hull, 26 foot beam, EXACTLY THREE masts with three cream gaff sails and two triangular headsails, small low aft deckhouse and working cargo hatches. No steam funnel, no square sails, no extra masts. Show it sailing off wooded west Grand Island in Lake Superior in cool clear morning light with a gentle breeze. Elevated starboard bow three-quarter view, every mast top and the bowsprit fully inside a landscape frame. Realistic canvas seams and subtle weathering, fine dark rigging, timber planking and soft blue lake ripples. Interpretive artwork of original sailing form, not archaeological evidence or an exact measured reconstruction. No text, logos or watermark.",
  "artefactCheck": {
    "date": "2026-09-08",
    "crops": [
      "bow",
      "midships",
      "stern",
      "rig-superstructure"
    ],
    "nativePixelInspection": true,
    "result": "clean",
    "imageSha256": "6f75c172f731e90e45997259b12981ab5d11b6b1cd20a7d976ec67db4ba5ca4f",
    "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."
  },
  "imageSha256": "6f75c172f731e90e45997259b12981ab5d11b6b1cd20a7d976ec67db4ba5ca4f"
}