Open metadata records dump: https://www.crossref.org/blog/new-public-data-file-120-million-metadata-records/ https://www.crossref.org/blog/new-public-data-file-

Open metadata records dump: https://www.crossref.org/blog/new-public-data-file-120-million-metadata-records/ https://www.crossref.org/blog/new-public-data-file-120-milli... DOI Content Negotiation to retrieve metadata in a way that's interoperable between DOI registration agencies: https://citation.crosscite.org/docs.html https://citation.crosscite.org/docs.html Crossref is expressly not opaque. Although we have a legacy codebase, we've committed to fully open source and open data. https://www.crossref.org/blog/crossrefs-board-votes-to-adopt-the-principles-of-open-scholarly-infrastructure/ https://www.crossref.org/blog/crossrefs-board-votes-to-adopt... (Disclaimer - I'm at Crossref)