{
  "schema": "studycommons.hero.provenance.v2",
  "asset_role": "Study Commons public Daily Read hero",
  "slug": "why-magnets-dont-stick-to-every-metal",
  "generation_id": "img-cb835059905b10165c02834c",
  "generator": "QwenImage21Pipeline",
  "model": "Qwen/Qwen-Image-2.1-Turbo",
  "model_revision": "fc13ba1986fcb905854dc8de2f52eee395f49b5b",
  "model_license": "Qwen Research License, non-commercial research/evaluation only; commercial use requires separate permission",
  "model_index_sha256": "97e2febeb19d93cb41fa44807cde8bd42757950b5dffeacdb0331fb2d390cf20",
  "checkpoint_sha256": "37230cd77d377c0be0acc06d628fd8a6e978e23eb2c530b73fa98df54ef62557",
  "renderer_source_sha256": "18b5d04715eadcb1d3672ba2b4f1af5da95fb9f8ebfdea97b3add250b08712c9",
  "prompt": "Editorial educational macro photograph for a Grade 3-4 science article. A simple unmarked red ceramic bar magnet lies on a natural wooden tabletop. Several plain silver steel paper clips are visibly attached to one end of the bar magnet, showing magnetic attraction. Nearby an unmarked piece of thin crumpled aluminium foil and a separate copper-coloured metal washer are resting freely, clearly NOT touching or attracted to the magnet. Three materials shown accurately in a single plausible real tabletop scene, physically credible distances and proportions, gentle natural window light, crisp object detail, generous negative space for responsive crop, landscape 16:9 composition, no people, no hands, no words, no lettering, no labels, no arrows, no fake magnetic lines, no logos, no watermark.",
  "prompt_sha256": "375ee6497409a0b012c4942e55775a551af789013fa90f0ef9e007efef010f8a",
  "negative_prompt": "",
  "seed": 131014,
  "width": 1312,
  "height": 736,
  "num_inference_steps": 8,
  "true_cfg_scale": 1.0,
  "scheduler": "FlowMatchEulerDiscreteScheduler",
  "sampling": "explicit-checkpoint-8-sigma",
  "sample_sigmas": [
    1.0,
    0.978453,
    0.95418,
    0.926626,
    0.89508,
    0.845148,
    0.704534,
    0.414568
  ],
  "generator_device": "cpu",
  "generator_algorithm": "torch.Generator('cpu').manual_seed(seed)",
  "torch_dtype": "bfloat16",
  "cpu_offload": "model",
  "use_kv_cache": true,
  "vae_tiling": true,
  "lora": null,
  "reference_images": [],
  "gpu": "NVIDIA CUDA (hardware-specific machine details withheld)",
  "runtime": {
    "torch": "2.14.0+cu130",
    "diffusers": "0.41.0.dev0",
    "transformers": "5.17.0",
    "cuda": "13.0"
  },
  "job_completed_at": "2026-10-13T18:13:49.163837+00:00",
  "output_png_sha256": "cb835059905b10165c02834c5263b8ec3917946c661b1a5d503b3536860cfe4e",
  "output_png_dimensions": [
    1312,
    736
  ],
  "postprocess": {
    "format": "AVIF",
    "ffmpeg_version": "ffmpeg version 6.1.1-3ubuntu5",
    "filter": "scale=1280:720:force_original_aspect_ratio=increase:flags=lanczos,crop=1280:720",
    "encoder": "libaom-av1",
    "still_picture": 1,
    "crf": 4,
    "bitrate": "0",
    "cpu_used": 6,
    "pix_fmt": "yuv420p",
    "frames": 1,
    "source_png_sha256": "cb835059905b10165c02834c5263b8ec3917946c661b1a5d503b3536860cfe4e",
    "output_avif_sha256": "93ceb37c2a9ac7b0fdda8d314518f23dfda47c6f9449dad494746756d0a92ae1",
    "output_avif_width": 1280,
    "output_avif_height": 720,
    "output_avif_bytes": 213120
  },
  "reproduce": {
    "recipe": "QwenImage21Pipeline.from_pretrained(model_path, dtype=torch.bfloat16); enable_model_cpu_offload(); vae.enable_tiling(); pipeline(prompt=prompt, width=width, height=height, true_cfg_scale=1.0, num_inference_steps=8, sigmas=sample_sigmas, use_kv_cache=True, generator=torch.Generator('cpu').manual_seed(seed)); encode PNG to AVIF using postprocess fields",
    "model_source": "Hugging Face model ID and exact model_revision above, subject to the stated license",
    "verification": "Compare generated image and encoded AVIF with the corresponding SHA-256 values above. Pixel-identical results are not guaranteed across devices or software builds."
  },
  "provenance_note": "This is an exact generation-parameter record and cryptographic integrity chain, not a legal ownership certificate or guarantee of third-party rights. Full private machine/job metadata is excluded."
}