{
  "schema": "studycommons.hero.provenance.v2",
  "asset_role": "Study Commons public Daily Read hero",
  "slug": "paper-bridge-test-evidence-cause-inference",
  "generation_id": "img-6fa58acf6fdf356ef1d3d888",
  "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": "de2a451bc7c95d530b8428e30cfc8d35a876c701915df1f61ed49165ebfda350",
  "prompt": "Realistic grade-school paper engineering science experiment photographed close-up on a wooden table: EXACTLY ONE sheet of white ordinary printer paper folded lengthwise into a neat accordion or corrugated beam, suspended horizontally across a 20 cm gap between two separate thick identical hardback books, with ONLY THREE small identical coins lying FLAT SIDE-BY-SIDE in the middle of the folded bridge. The bridge does not collapse but visibly supports the small weight. Show clear separation between the two book stacks, no multiple paper sheets, no towering coin stack, no glue or other supports, no writing. Full-bleed horizontal photograph composition. Professional wide 16:9 realistic educational editorial composition, no typography, text, logos, labels or watermarks.",
  "prompt_sha256": "712b839cd37aa31f69933a11bfad4b24534f3fa930142a15ab5232a736c82372",
  "negative_prompt": "",
  "seed": 2026114121,
  "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": "2.13.0+cu130",
    "diffusers": "0.41.0",
    "transformers": "5.17.0",
    "cuda": "13.0"
  },
  "job_completed_at": "2026-11-01T12:53:44.373898+00:00",
  "output_png_sha256": "6fa58acf6fdf356ef1d3d8889434e46751eeda9cde2248807e364f62e84ba66f",
  "output_png_dimensions": [
    1312,
    736
  ],
  "postprocess": {
    "format": "AVIF",
    "ffmpeg_version": "ffmpeg version 6.1.1-3ubuntu5 Copyright (c) 2000-2023 the FFmpeg developers",
    "filter": "scale=1280:720:force_original_aspect_ratio=increase:flags=lanczos,crop=1280:720",
    "encoder": "libaom-av1",
    "still_picture": 1,
    "crf": 16,
    "bitrate": "0",
    "cpu_used": 6,
    "pix_fmt": "yuv420p",
    "frames": 1,
    "source_png_sha256": "6fa58acf6fdf356ef1d3d8889434e46751eeda9cde2248807e364f62e84ba66f",
    "output_avif_sha256": "481d8912405f099b13b5513f511fc7cd55678c2a2f35aff279bbff854a06024a",
    "output_avif_width": 1280,
    "output_avif_height": 720,
    "output_avif_bytes": 37487
  },
  "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 PNG and AVIF against SHA-256 fields. Accelerator and software differences may prevent bit-for-bit equality."
  },
  "provenance_note": "Generation parameters and cryptographic integrity chain, not proof of legal ownership or absence of third-party rights. Private machine paths are excluded."
}