{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2013:XQL4D55HESIC3KAB52ODXUCZJL","short_pith_number":"pith:XQL4D55H","canonical_record":{"source":{"id":"1307.0788","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.soc-ph","submitted_at":"2013-07-02T18:37:34Z","cross_cats_sorted":["cs.DL"],"title_canon_sha256":"5ebf6b1840e703f87f345868747948da46ff018d1cc04af60ddac618a58828e7","abstract_canon_sha256":"87a3e278d509d7645b04489fd8c4078d52d6d92f7fa6da3a2a1136ebdbe9c1b6"},"schema_version":"1.0"},"canonical_sha256":"bc17c1f7a724902da801ee9c3bd0594aec87fe36e560028f7819b110b5b3ddd0","source":{"kind":"arxiv","id":"1307.0788","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1307.0788","created_at":"2026-05-18T03:04:37Z"},{"alias_kind":"arxiv_version","alias_value":"1307.0788v2","created_at":"2026-05-18T03:04:37Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1307.0788","created_at":"2026-05-18T03:04:37Z"},{"alias_kind":"pith_short_12","alias_value":"XQL4D55HESIC","created_at":"2026-05-18T12:28:06Z"},{"alias_kind":"pith_short_16","alias_value":"XQL4D55HESIC3KAB","created_at":"2026-05-18T12:28:06Z"},{"alias_kind":"pith_short_8","alias_value":"XQL4D55H","created_at":"2026-05-18T12:28:06Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2013:XQL4D55HESIC3KAB52ODXUCZJL","target":"record","payload":{"canonical_record":{"source":{"id":"1307.0788","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.soc-ph","submitted_at":"2013-07-02T18:37:34Z","cross_cats_sorted":["cs.DL"],"title_canon_sha256":"5ebf6b1840e703f87f345868747948da46ff018d1cc04af60ddac618a58828e7","abstract_canon_sha256":"87a3e278d509d7645b04489fd8c4078d52d6d92f7fa6da3a2a1136ebdbe9c1b6"},"schema_version":"1.0"},"canonical_sha256":"bc17c1f7a724902da801ee9c3bd0594aec87fe36e560028f7819b110b5b3ddd0","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T03:04:37.584621Z","signature_b64":"gLwfgUGaxsjBnm9X/Pw1NAj9k7WvU+Odj8ybvm+KQcFeFz5IgR2CjggSrnat7LpU1VW4UbSTB79SNfEab1boDw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"bc17c1f7a724902da801ee9c3bd0594aec87fe36e560028f7819b110b5b3ddd0","last_reissued_at":"2026-05-18T03:04:37.583760Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T03:04:37.583760Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1307.0788","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":"2026-05-18T03:04:37Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"XSu6abLtQwHGgrbjcTbG+fE0EEL7BMSFtH5G9Py4Udw7FjG4ClKDkW932eXRLI9aR8phtED/G+PM8wuwR4CiCg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-30T18:17:12.407248Z"},"content_sha256":"c129e603c6331e40d9ecbc7903272d807ca34a81f9603ae34e02dac120db91a9","schema_version":"1.0","event_id":"sha256:c129e603c6331e40d9ecbc7903272d807ca34a81f9603ae34e02dac120db91a9"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2013:XQL4D55HESIC3KAB52ODXUCZJL","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Categorical and Geographical Separation in Science","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["cs.DL"],"primary_cat":"physics.soc-ph","authors_text":"Janusz A. Holyst, Julian Sienkiewicz, Krzysztof Soja, Peter M. A. Sloot","submitted_at":"2013-07-02T18:37:34Z","abstract_excerpt":"We perform the analysis of scientific collaboration at the level of universities. The scope of this study is to answer two fundamental questions: (i) can one indicate a category (i.e., a scientific discipline) that has the greatest impact on the rank of the university and (ii) do the best universities collaborate with the best ones only? Using two university ranking lists (ARWU and QS) as well as data from the Science Citation Index we show how the number of publications in certain categories correlates with the university rank. Moreover, using complex networks analysis, we give hints that the"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1307.0788","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":"2026-05-18T03:04:37Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"FaBKjUiGg8ta7+0s3jTe70AVbRrtetSCM/jDhoqevxW0Q5geh9OQhgUnFEJWsCEhxjV/ouUla/Zh+VZrWHWUCA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-30T18:17:12.407608Z"},"content_sha256":"6eeb9791248446a53c01823c185e99cca3b649f2b42238b17dfa7b68a60a9a9b","schema_version":"1.0","event_id":"sha256:6eeb9791248446a53c01823c185e99cca3b649f2b42238b17dfa7b68a60a9a9b"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/XQL4D55HESIC3KAB52ODXUCZJL/bundle.json","state_url":"https://pith.science/pith/XQL4D55HESIC3KAB52ODXUCZJL/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/XQL4D55HESIC3KAB52ODXUCZJL/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":"2026-05-30T18:17:12Z","links":{"resolver":"https://pith.science/pith/XQL4D55HESIC3KAB52ODXUCZJL","bundle":"https://pith.science/pith/XQL4D55HESIC3KAB52ODXUCZJL/bundle.json","state":"https://pith.science/pith/XQL4D55HESIC3KAB52ODXUCZJL/state.json","well_known_bundle":"https://pith.science/.well-known/pith/XQL4D55HESIC3KAB52ODXUCZJL/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2013:XQL4D55HESIC3KAB52ODXUCZJL","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":"87a3e278d509d7645b04489fd8c4078d52d6d92f7fa6da3a2a1136ebdbe9c1b6","cross_cats_sorted":["cs.DL"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.soc-ph","submitted_at":"2013-07-02T18:37:34Z","title_canon_sha256":"5ebf6b1840e703f87f345868747948da46ff018d1cc04af60ddac618a58828e7"},"schema_version":"1.0","source":{"id":"1307.0788","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1307.0788","created_at":"2026-05-18T03:04:37Z"},{"alias_kind":"arxiv_version","alias_value":"1307.0788v2","created_at":"2026-05-18T03:04:37Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1307.0788","created_at":"2026-05-18T03:04:37Z"},{"alias_kind":"pith_short_12","alias_value":"XQL4D55HESIC","created_at":"2026-05-18T12:28:06Z"},{"alias_kind":"pith_short_16","alias_value":"XQL4D55HESIC3KAB","created_at":"2026-05-18T12:28:06Z"},{"alias_kind":"pith_short_8","alias_value":"XQL4D55H","created_at":"2026-05-18T12:28:06Z"}],"graph_snapshots":[{"event_id":"sha256:6eeb9791248446a53c01823c185e99cca3b649f2b42238b17dfa7b68a60a9a9b","target":"graph","created_at":"2026-05-18T03:04:37Z","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":"We perform the analysis of scientific collaboration at the level of universities. The scope of this study is to answer two fundamental questions: (i) can one indicate a category (i.e., a scientific discipline) that has the greatest impact on the rank of the university and (ii) do the best universities collaborate with the best ones only? Using two university ranking lists (ARWU and QS) as well as data from the Science Citation Index we show how the number of publications in certain categories correlates with the university rank. Moreover, using complex networks analysis, we give hints that the","authors_text":"Janusz A. Holyst, Julian Sienkiewicz, Krzysztof Soja, Peter M. A. Sloot","cross_cats":["cs.DL"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.soc-ph","submitted_at":"2013-07-02T18:37:34Z","title":"Categorical and Geographical Separation in Science"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1307.0788","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:c129e603c6331e40d9ecbc7903272d807ca34a81f9603ae34e02dac120db91a9","target":"record","created_at":"2026-05-18T03:04:37Z","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":"87a3e278d509d7645b04489fd8c4078d52d6d92f7fa6da3a2a1136ebdbe9c1b6","cross_cats_sorted":["cs.DL"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.soc-ph","submitted_at":"2013-07-02T18:37:34Z","title_canon_sha256":"5ebf6b1840e703f87f345868747948da46ff018d1cc04af60ddac618a58828e7"},"schema_version":"1.0","source":{"id":"1307.0788","kind":"arxiv","version":2}},"canonical_sha256":"bc17c1f7a724902da801ee9c3bd0594aec87fe36e560028f7819b110b5b3ddd0","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"bc17c1f7a724902da801ee9c3bd0594aec87fe36e560028f7819b110b5b3ddd0","first_computed_at":"2026-05-18T03:04:37.583760Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T03:04:37.583760Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"gLwfgUGaxsjBnm9X/Pw1NAj9k7WvU+Odj8ybvm+KQcFeFz5IgR2CjggSrnat7LpU1VW4UbSTB79SNfEab1boDw==","signature_status":"signed_v1","signed_at":"2026-05-18T03:04:37.584621Z","signed_message":"canonical_sha256_bytes"},"source_id":"1307.0788","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:c129e603c6331e40d9ecbc7903272d807ca34a81f9603ae34e02dac120db91a9","sha256:6eeb9791248446a53c01823c185e99cca3b649f2b42238b17dfa7b68a60a9a9b"],"state_sha256":"40e78da33736934cc01cb15601c27d3f866d12d5eedb41dca28d9214b8902544"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"+7zr5nQE37H3zQtAO4uI+QV1pXpnuawWTUEI2Qpv1gJKAWlqIvR/m7puCaWeUufjVEW7PBopJnPvF0HsEpPxBw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-30T18:17:12.409848Z","bundle_sha256":"be891434b846cbabf67b075a0fbb5622195b395589fe6aa3e42d2f8ca9fe1327"}}