{
  "schema_version": "2.0.0",
  "source_index_schema_version": "2.0.0",
  "manifest_kind": "heavy_metal_index_evidence_packet",
  "retrieval_timestamp": "2026-10-16T12:15:16.460Z",
  "page": {
    "slug": "sources/usman2022-pleurotus-mushroom-substrates",
    "title": "Proximate composition and heavy metal content of Pleurotus tuberregium mushroom grown on different substrates in (Aba) Nigeria",
    "description": null,
    "page_type": "source",
    "audience": [],
    "canonical_url": "https://heavymetalindex.com/sources/usman2022-pleurotus-mushroom-substrates",
    "wiki_doi": null
  },
  "content_pin": {
    "status": "unpinned",
    "reason": "Git history and a matching verified prior manifest are unavailable.",
    "content_hash_scheme": "sha256-utf8-authored-markdown-v2",
    "content_hash_description": "Strip leading YAML; remove only generated hmi-page-history and hmi-page-references marker blocks; trim trailing whitespace and append one LF. Other Markdown bytes are preserved.",
    "content_sha256": "c72b3fbf9b3baa6b87e05b8ddb010c5a96ce72616f892b452df1763a99f92adb",
    "content_bytes": 2112,
    "metadata_sha256": "771a6249503ce9773b9b5bbaf61f686ee27d811fbec7b77c1f778d8dd6b30b15",
    "metadata_hash_description": "SHA-256 of recursively key-sorted JSON from parsed YAML, excluding updated and numeric sources (generated display metadata). All other frontmatter fields are included.",
    "published_body_sha256": "39e02b517843e62635c3533c06d91b2bb0238a622ad6e73047757b5b15882192",
    "published_body_bytes": 2350,
    "published_checksum_note": "Published-body and full-Markdown checksums describe the build input, including generated display sections. They are not claimed to equal the Git revision's display sections.",
    "markdown_sha256": "772743adbbfb90225dc32d4c1128dc00730b94181817531ebcab6861b077a3f8",
    "markdown_bytes": 3370,
    "git_commit_sha": null,
    "last_commit_sha": null,
    "last_commit_date": null,
    "git_remote": "https://github.com/paleofoundation/heavymetalindex",
    "verify_command": null
  },
  "contributing_sources": [],
  "data_downloads": [],
  "ingest_contract": {
    "metadata_complete": false,
    "ingest_complete": false,
    "gaps": [
      "evidence_fitness",
      "raw_sha256"
    ],
    "completion_note": "Metadata completeness alone does not prove extraction, routing, or primary-source coverage. Completed ingest requires its reconciliation and route audits."
  },
  "license": {
    "prose": "CC BY 4.0",
    "structured_data": "EU database rights reserved — see https://heavymetalindex.com/licensing",
    "attribution": "Heavy Metal Index (heavymetalindex.com), Institute of Contaminant Standards. Cite canonical_url or wiki_doi.",
    "contact": "karen@paleofoundation.com"
  },
  "attestation": {
    "for_use": "Citation, regulatory submission, or peer-review supplementary record.",
    "verifiable_by": "This manifest reports build-input checksums but has no verified Git pin. It cannot establish that these page bytes correspond to a named Git revision.",
    "not_a_certification": "This manifest records publication provenance. It does not certify products or independently validate the page's scientific claims.",
    "license_terms": "https://heavymetalindex.com/licensing"
  },
  "generated_at": "2026-10-16T07:49:22.404Z"
}