. . . . "This query returns the introduction nanopublications of a given user, with their creation date, key location, and declared public key hashes." . . . "Get user introductions" . . "prefix np: \nprefix npx: \nprefix npa: \nprefix dct: \n\nselect (max(?date0) as ?date) (sample(str(?keyLocation)) as ?location) (group_concat(distinct ?keyHash; separator=\", \") as ?keys) ?np (\"^\" as ?np_label) where {\n graph npa:graph {\n ?np npa:hasValidSignatureForPublicKey ?introPubkey .\n filter not exists { ?npx npx:invalidates ?np ; npa:hasValidSignatureForPublicKey ?introPubkey . }\n ?np dct:created ?date0 .\n ?np np:hasAssertion ?a .\n }\n graph ?a {\n ?keydeclaration npx:declaredBy ?_user_iri .\n ?keydeclaration npx:hasPublicKey ?pubkey .\n optional { ?keydeclaration npx:hasKeyLocation ?keyLocation . }\n bind(substr(sha256(?pubkey), 1, 10) as ?keyHash)\n }\n}\ngroup by ?np\norder by desc(max(?date0))" . . "Tobias Kuhn" . "2026-06-02T11:55:27Z"^^ . . . . . . . . . "RSA" . "MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQCwUtewGCpT5vIfXYE1bmf/Uqu1ojqnWdYxv+ySO80ul8Gu7m8KoyPAwuvaPj0lvPtHrg000qMmkxzKhYknEjq8v7EerxZNYp5B3/3+5ZpuWOYAs78UnQVjbHSmDdmryr4D4VvvNIiUmd0yxci47dTFUj4DvfHnGd6hVe5+goqdcwIDAQAB" . "hUaCBNtLZQy36dfslsKDbWHAfKixmfJnDQFmWvgJ+C+HhmLVv3fp8dyhFt0giLGuGNlu6ims6/JWHNlOftkOsTlg2pBhSyh6ryhTdgiNRiygG3MMpO/6x7D2nvn5jjpjp3PGTAD287ChYQm1+7BhYW+mitAeGpAGsYdezTzAUDU=" . . .