{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2013:PWYXOJPQNIQXHKQO7TURVOLUME","short_pith_number":"pith:PWYXOJPQ","canonical_record":{"source":{"id":"1306.2866","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.DL","submitted_at":"2013-06-12T15:40:48Z","cross_cats_sorted":[],"title_canon_sha256":"97e4a6266c124c53d6e453b9c3f1914cc73a93b8d3477c987dbbec3474566064","abstract_canon_sha256":"2fd3d7e7f19a90db14d05109e3f9379829c3ed37d5f920455e4c9e6ba777aa92"},"schema_version":"1.0"},"canonical_sha256":"7db17725f06a2173aa0efce91ab97461160bd514c63b5968c6cf7ff52712ceda","source":{"kind":"arxiv","id":"1306.2866","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1306.2866","created_at":"2026-05-18T03:03:44Z"},{"alias_kind":"arxiv_version","alias_value":"1306.2866v2","created_at":"2026-05-18T03:03:44Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1306.2866","created_at":"2026-05-18T03:03:44Z"},{"alias_kind":"pith_short_12","alias_value":"PWYXOJPQNIQX","created_at":"2026-05-18T12:27:57Z"},{"alias_kind":"pith_short_16","alias_value":"PWYXOJPQNIQXHKQO","created_at":"2026-05-18T12:27:57Z"},{"alias_kind":"pith_short_8","alias_value":"PWYXOJPQ","created_at":"2026-05-18T12:27:57Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2013:PWYXOJPQNIQXHKQO7TURVOLUME","target":"record","payload":{"canonical_record":{"source":{"id":"1306.2866","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.DL","submitted_at":"2013-06-12T15:40:48Z","cross_cats_sorted":[],"title_canon_sha256":"97e4a6266c124c53d6e453b9c3f1914cc73a93b8d3477c987dbbec3474566064","abstract_canon_sha256":"2fd3d7e7f19a90db14d05109e3f9379829c3ed37d5f920455e4c9e6ba777aa92"},"schema_version":"1.0"},"canonical_sha256":"7db17725f06a2173aa0efce91ab97461160bd514c63b5968c6cf7ff52712ceda","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T03:03:44.284364Z","signature_b64":"pDD99X5yBBJ7banVhT+C7JKnxScRLkaKE8tCl1aa8Xd4rnLd07cm5X6/DPgCct5USfWYPao42DDpmmR47OEwCQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"7db17725f06a2173aa0efce91ab97461160bd514c63b5968c6cf7ff52712ceda","last_reissued_at":"2026-05-18T03:03:44.283540Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T03:03:44.283540Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1306.2866","source_version":2,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T03:03:44Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"PPpo/ljuDUdVBkoQsAhfL2bRLFirCRIuPAJxGCtttbZv+o6x4nGpC2UOF0IISWJLrZrYDV2OWDGecxRpntB3CA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-22T01:16:15.787478Z"},"content_sha256":"ce6372b779c006198e2cf97dd44647d15b5c1f1b3306becf8161b16924f27592","schema_version":"1.0","event_id":"sha256:ce6372b779c006198e2cf97dd44647d15b5c1f1b3306becf8161b16924f27592"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2013:PWYXOJPQNIQXHKQO7TURVOLUME","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Hierarchical structuring of Cultural Heritage objects within large aggregations","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"cs.DL","authors_text":"Anthi Agoropoulou, Antoine Isaac, Rob Koopman, Shenghui Wang, Titia van der Werf, Valentine Charles","submitted_at":"2013-06-12T15:40:48Z","abstract_excerpt":"Huge amounts of cultural content have been digitised and are available through digital libraries and aggregators like Europeana.eu. However, it is not easy for a user to have an overall picture of what is available nor to find related objects. We propose a method for hier- archically structuring cultural objects at different similarity levels. We describe a fast, scalable clustering algorithm with an automated field selection method for finding semantic clusters. We report a qualitative evaluation on the cluster categories based on records from the UK and a quantitative one on the results from"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1306.2866","kind":"arxiv","version":2},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"references":{"count":0,"sample":[],"resolved_work":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","internal_anchors":0},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"author_claims":{"count":0,"strong_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"builder_version":"pith-number-builder-2026-05-17-v1"},"verdict_id":null},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T03:03:44Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"GAP+xU1YKUE0o25QtM1jaRMbnDtHEPGic7p/au/9mxj2hjl4yBWYjblaZGPR1oSZOHajMOU2pr4JtIAJBftWBg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-22T01:16:15.787832Z"},"content_sha256":"21fa4cd953b9c5ecf3514d3a4c629c57cada2d8d2c280d4a75b69501607d22cf","schema_version":"1.0","event_id":"sha256:21fa4cd953b9c5ecf3514d3a4c629c57cada2d8d2c280d4a75b69501607d22cf"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/PWYXOJPQNIQXHKQO7TURVOLUME/bundle.json","state_url":"https://pith.science/pith/PWYXOJPQNIQXHKQO7TURVOLUME/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/PWYXOJPQNIQXHKQO7TURVOLUME/bundle.json","status":"primary"}],"public_keys":[{"key_id":"pith-v1-2026-05","algorithm":"ed25519","format":"raw","public_key_b64":"stVStoiQhXFxp4s2pdzPNoqVNBMojDU/fJ2db5S3CbM=","public_key_hex":"b2d552b68890857171a78b36a5dccf368a953413288c353f7c9d9d6f94b709b3","fingerprint_sha256_b32_first128bits":"RVFV5Z2OI2J3ZUO7ERDEBCYNKS","fingerprint_sha256_hex":"8d4b5ee74e4693bcd1df2446408b0d54","rotates_at":null,"url":"https://pith.science/pith-signing-key.json","notes":"Pith uses this Ed25519 key to sign canonical record SHA-256 digests. Verify with: ed25519_verify(public_key, message=canonical_sha256_bytes, signature=base64decode(signature_b64))."}],"merge_version":"pith-open-graph-merge-v1","built_at":"2026-06-22T01:16:15Z","links":{"resolver":"https://pith.science/pith/PWYXOJPQNIQXHKQO7TURVOLUME","bundle":"https://pith.science/pith/PWYXOJPQNIQXHKQO7TURVOLUME/bundle.json","state":"https://pith.science/pith/PWYXOJPQNIQXHKQO7TURVOLUME/state.json","well_known_bundle":"https://pith.science/.well-known/pith/PWYXOJPQNIQXHKQO7TURVOLUME/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2013:PWYXOJPQNIQXHKQO7TURVOLUME","merge_version":"pith-open-graph-merge-v1","event_count":2,"valid_event_count":2,"invalid_event_count":0,"equivocation_count":0,"current":{"canonical_record":{"metadata":{"abstract_canon_sha256":"2fd3d7e7f19a90db14d05109e3f9379829c3ed37d5f920455e4c9e6ba777aa92","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.DL","submitted_at":"2013-06-12T15:40:48Z","title_canon_sha256":"97e4a6266c124c53d6e453b9c3f1914cc73a93b8d3477c987dbbec3474566064"},"schema_version":"1.0","source":{"id":"1306.2866","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1306.2866","created_at":"2026-05-18T03:03:44Z"},{"alias_kind":"arxiv_version","alias_value":"1306.2866v2","created_at":"2026-05-18T03:03:44Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1306.2866","created_at":"2026-05-18T03:03:44Z"},{"alias_kind":"pith_short_12","alias_value":"PWYXOJPQNIQX","created_at":"2026-05-18T12:27:57Z"},{"alias_kind":"pith_short_16","alias_value":"PWYXOJPQNIQXHKQO","created_at":"2026-05-18T12:27:57Z"},{"alias_kind":"pith_short_8","alias_value":"PWYXOJPQ","created_at":"2026-05-18T12:27:57Z"}],"graph_snapshots":[{"event_id":"sha256:21fa4cd953b9c5ecf3514d3a4c629c57cada2d8d2c280d4a75b69501607d22cf","target":"graph","created_at":"2026-05-18T03:03:44Z","signer":{"key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signer_id":"pith.science","signer_type":"pith_registry"},"payload":{"graph_snapshot":{"author_claims":{"count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","strong_count":0},"builder_version":"pith-number-builder-2026-05-17-v1","claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"paper":{"abstract_excerpt":"Huge amounts of cultural content have been digitised and are available through digital libraries and aggregators like Europeana.eu. However, it is not easy for a user to have an overall picture of what is available nor to find related objects. We propose a method for hier- archically structuring cultural objects at different similarity levels. We describe a fast, scalable clustering algorithm with an automated field selection method for finding semantic clusters. We report a qualitative evaluation on the cluster categories based on records from the UK and a quantitative one on the results from","authors_text":"Anthi Agoropoulou, Antoine Isaac, Rob Koopman, Shenghui Wang, Titia van der Werf, Valentine Charles","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.DL","submitted_at":"2013-06-12T15:40:48Z","title":"Hierarchical structuring of Cultural Heritage objects within large aggregations"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1306.2866","kind":"arxiv","version":2},"verdict":{"created_at":null,"id":null,"model_set":{},"one_line_summary":"","pipeline_version":null,"pith_extraction_headline":"","strongest_claim":"","weakest_assumption":""}},"verdict_id":null}}],"author_attestations":[],"timestamp_anchors":[],"storage_attestations":[],"citation_signatures":[],"replication_records":[],"corrections":[],"mirror_hints":[],"record_created":{"event_id":"sha256:ce6372b779c006198e2cf97dd44647d15b5c1f1b3306becf8161b16924f27592","target":"record","created_at":"2026-05-18T03:03:44Z","signer":{"key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signer_id":"pith.science","signer_type":"pith_registry"},"payload":{"attestation_state":"computed","canonical_record":{"metadata":{"abstract_canon_sha256":"2fd3d7e7f19a90db14d05109e3f9379829c3ed37d5f920455e4c9e6ba777aa92","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.DL","submitted_at":"2013-06-12T15:40:48Z","title_canon_sha256":"97e4a6266c124c53d6e453b9c3f1914cc73a93b8d3477c987dbbec3474566064"},"schema_version":"1.0","source":{"id":"1306.2866","kind":"arxiv","version":2}},"canonical_sha256":"7db17725f06a2173aa0efce91ab97461160bd514c63b5968c6cf7ff52712ceda","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"7db17725f06a2173aa0efce91ab97461160bd514c63b5968c6cf7ff52712ceda","first_computed_at":"2026-05-18T03:03:44.283540Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T03:03:44.283540Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"pDD99X5yBBJ7banVhT+C7JKnxScRLkaKE8tCl1aa8Xd4rnLd07cm5X6/DPgCct5USfWYPao42DDpmmR47OEwCQ==","signature_status":"signed_v1","signed_at":"2026-05-18T03:03:44.284364Z","signed_message":"canonical_sha256_bytes"},"source_id":"1306.2866","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:ce6372b779c006198e2cf97dd44647d15b5c1f1b3306becf8161b16924f27592","sha256:21fa4cd953b9c5ecf3514d3a4c629c57cada2d8d2c280d4a75b69501607d22cf"],"state_sha256":"1b8c0e95c964865a0d4e95bcfab2d9e54a6266f0e693850b84c3b222179afcb1"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"UuIHy7u4IbbsgmjGNF+AEbX8udSrL/pfubx9BHg3QwS+100AzDOrhFiapnX50t6eBlESw1uGcH33CAy/6/UOAA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-22T01:16:15.789804Z","bundle_sha256":"22299ff36b3b79019b108c0716269e8130f2eb39900f82a1169f0223166556af"}}