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Sources and verification

Where GAKN’s knowledge comes from, what we may show from each source, and how we label trust.

Crossref

Responding

Bibliographic metadata usable for any purpose; abstracts may remain under publisher copyright.

Metadata and a short excerptTerms✓ 2026-10-22 22:43 UTC

DOAJ

Failing

Metadata CC0; articles open access under the journal licence.

Metadata and a short excerptTerms✓ 2026-10-22 22:43 UTC

Data.gov

Responding

US federal data generally public domain; each dataset states its licence.

Metadata and a short excerptTerms✓ 2026-10-22 22:43 UTC

Europe PMC

Responding

Article licence varies; abstracts excerpted only.

Metadata and a short excerptTerms✓ 2026-10-22 22:43 UTC

Hacker News

Responding

Posts belong to their authors; titles and links only.

Title and link onlyTerms✓ 2026-10-22 22:43 UTC

OpenAlex

Needs a free key (owner action)

Scholarly metadata CC0.

Metadata and a short excerptTerms

PeerTube (SepiaSearch index)

Responding

Videos hosted by independent PeerTube instances; licence set per video.

Metadata and a short excerptTerms✓ 2026-10-22 22:43 UTC

Wikidata

Responding

Structured data CC0 1.0.

Metadata and a short excerptTerms✓ 2026-10-22 22:43 UTC

Wikipedia

Responding

Text CC BY-SA 4.0; commercial reuse allowed with attribution and share-alike.

Metadata and a short excerptTerms✓ 2026-10-22 22:43 UTC

Zenodo

Responding

Record metadata CC0; files carry their own licence.

Metadata and a short excerptTerms✓ 2026-10-22 22:43 UTC

arXiv

Responding

Metadata CC0; each paper carries its own licence.

Metadata and a short excerptTerms✓ 2026-10-22 22:43 UTC

How verification works

  1. Every result names its source and links to the original. GAKN does not claim ownership of material from other sources.
  2. Authors attach claims to their work. Anyone signed in can add evidence that supports or contradicts a claim, with a link and a short quote.
  3. A claim with only supporting evidence is “Supported”, with only contradicting evidence “Contradicted”, with both “Disputed”. An item with any disputed or contradicted claim is labelled “Disputed”.
  4. Publishers declare how a text was made: by a person, with AI assistance, generated by AI, or machine-translated. Machine translations always link to the original.

Not connected, and why

YouTube
YouTube’s developer policies forbid offering an API that gives access to YouTube data, selling access, and caching beyond 30 days. GAKN’s agent API would conflict, so YouTube is not connected.
Internet Archive
Its terms historically limit use to scholarship and research purposes; pending the owner’s review of the current terms.
Open Library
Its guidelines say the APIs are not meant as a data backend for third-party services; bulk monthly dumps are the permitted route.
Semantic Scholar
Needs an API key and a licence review (parts of the data are non-commercial).
Europeana · Stack Exchange · Openverse
Free API keys are required; they will be connected once the owner registers them.
Reddit · X · LinkedIn · Facebook
Closed platforms without permitted bulk access for this use.