{
  "tool": "OpenAI built-in image generation",
  "imageFile": "sagamore-illustration.png",
  "createdDate": "2026-09-08",
  "revisedDate": "2026-09-08",
  "referenceRole": "Revised model render",
  "referenceFile": "sagamore-model-three-quarter.png",
  "referenceFiles": [
    "sagamore-model-three-quarter.png"
  ],
  "historicalStatus": "AI-generated interpretive artwork; not documentary evidence or an exact GLB render",
  "generationPrompt": "Unpowered steel whaleback Sagamore1892–1901,308ft: round blunt snout, long almost-unbroken turtleback with TWELVE small low hatchcovers between round turrets. Aft turret holds cabin and three stern rings, low forward turret, no engine or smokestack. Smooth dark STEEL plating with restrained seams. Calmly anchored Lake Superior, natural tan manila line from bow mooring ring out of frame, no bow wave. Soft distant fog bank, low tree line. Suppress nameboard lettering from reference in artwork; board may be plain. 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": "9c85672825ab81e028929003481c90b5ae2cf48a1740088882265b9613f38b37",
  "artefactCheck": {
    "date": "2026-09-08",
    "crops": [
      "bow",
      "midships",
      "stern",
      "rig-superstructure"
    ],
    "nativePixelInspection": true,
    "result": "regenerated",
    "imageSha256": "9c85672825ab81e028929003481c90b5ae2cf48a1740088882265b9613f38b37",
    "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."
  }
}