Welcome to Wikidata, Speravir!
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User:Arachn0 is correct, everything was fine and all IDs and links worked correctly. Whether an ID is valid/invalid has nothing to do with the format. VIAF IDs also come in different formats, but are all stored in one property. The property now links to a pirate site from the USA, which copied content copyrighted by the Baltic Historic Commission. They don't have content for each of the BBLD IDs. Jura1 also replaced valid BBLD IDs with invalid BBLD IDs breaking links in the German, Russian and maybe other Wikipedias that rely on P2580.
126.96.36.199 17:21, 18 March 2019 (UTC)