{
  "schema": "studycommons.hero.provenance.v2",
  "asset_role": "Study Commons public Daily Read hero",
  "slug": "2026-chemistry-nobel-why-molecules-have-two-hands",
  "generation_id": "img-43ee0dd9b1d085a91cdf83b4",
  "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": "Create one premium editorial hero illustration for a public English elementary learning article. Article title: Science News: Why Can a Molecule Have a Left and a Right Hand? Context: A new Nobel Prize story about mirror-image molecules explains how molecular shape influences chemistry, medicine and the evidence scientists use. Specific scene: Two clean laboratory gloves, left and right, arranged as mirror counterparts beside one glass beaker. No molecular structures, molecular claims, or readable text. Accurate observable details, physically plausible scene, honest proportions and natural lighting, restrained polished photography, age-appropriate, one clear focal point, clean composition. Wide 16:9 framing, safe margins, no collage or split panels unless required by the scene. No text, legible labels, numbers, equations, graphs, callouts, arrows, logos or watermarks. This is only a visual hero, NOT a scientific instructional diagram and NOT experimental evidence.",
  "prompt_sha256": "607727560114981664bbebcdf7f89a7f76bceb62b5132c60aa2e3e8eac07ea02",
  "negative_prompt": "",
  "seed": 493394960,
  "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": "2026-10-13T23:18:41.990048+00:00",
  "output_png_sha256": "43ee0dd9b1d085a91cdf83b478efc6a3441ceee8418c31c209fd0b23cdfbd1f9",
  "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": 1,
    "bitrate": "0",
    "cpu_used": 6,
    "pix_fmt": "yuv420p",
    "frames": 1,
    "source_png_sha256": "43ee0dd9b1d085a91cdf83b478efc6a3441ceee8418c31c209fd0b23cdfbd1f9",
    "output_avif_sha256": "41e711c608d9a01eb6f973c84c95ac79e04e8ed5ab702a82796a3da70ec43d6c",
    "output_avif_width": 1280,
    "output_avif_height": 720,
    "output_avif_bytes": 184834
  },
  "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."
}