Verify research downloads beyond PDF URL extensions
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During public-paper collection, the PMC bigWig PDF route returned challenge HTML while the open-access Semantic Scholar copy parsed as the correct four-page article. The official USENIX BTrDB PDF initially returned 403 but succeeded with a browser User-Agent. Verify the PDF signature, extracted title, page count and rendered first page before delivering files; a URL ending in .pdf is not proof of a successful download.