{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2018:APTRV3OQTR4GGZC3EUPTILBWHY","short_pith_number":"pith:APTRV3OQ","canonical_record":{"source":{"id":"1806.03834","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.soc-ph","submitted_at":"2018-06-11T07:03:01Z","cross_cats_sorted":["cs.SI"],"title_canon_sha256":"7e3df0ace126809c42fa70ef9190dbf2d8a3482f4ca63d2709bfb4e6fe2cb68d","abstract_canon_sha256":"7ce5353bbf97be27b334d130b746e32a8c5967fd81faacca8086c64f658a0997"},"schema_version":"1.0"},"canonical_sha256":"03e71aedd09c7863645b251f342c363e25e41219189e5e756ea9bb3534b3c538","source":{"kind":"arxiv","id":"1806.03834","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1806.03834","created_at":"2026-05-18T00:13:22Z"},{"alias_kind":"arxiv_version","alias_value":"1806.03834v1","created_at":"2026-05-18T00:13:22Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1806.03834","created_at":"2026-05-18T00:13:22Z"},{"alias_kind":"pith_short_12","alias_value":"APTRV3OQTR4G","created_at":"2026-05-18T12:32:13Z"},{"alias_kind":"pith_short_16","alias_value":"APTRV3OQTR4GGZC3","created_at":"2026-05-18T12:32:13Z"},{"alias_kind":"pith_short_8","alias_value":"APTRV3OQ","created_at":"2026-05-18T12:32:13Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2018:APTRV3OQTR4GGZC3EUPTILBWHY","target":"record","payload":{"canonical_record":{"source":{"id":"1806.03834","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.soc-ph","submitted_at":"2018-06-11T07:03:01Z","cross_cats_sorted":["cs.SI"],"title_canon_sha256":"7e3df0ace126809c42fa70ef9190dbf2d8a3482f4ca63d2709bfb4e6fe2cb68d","abstract_canon_sha256":"7ce5353bbf97be27b334d130b746e32a8c5967fd81faacca8086c64f658a0997"},"schema_version":"1.0"},"canonical_sha256":"03e71aedd09c7863645b251f342c363e25e41219189e5e756ea9bb3534b3c538","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T00:13:22.533606Z","signature_b64":"QQ31iz41i9qjbFRN3ovB4KfQqW5dnwEmkpaFRjt6lBOXJG1sDlrSa9ITLtMMD0Rejvn7rcFnaldLg136AbPZDA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"03e71aedd09c7863645b251f342c363e25e41219189e5e756ea9bb3534b3c538","last_reissued_at":"2026-05-18T00:13:22.532882Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T00:13:22.532882Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1806.03834","source_version":1,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T00:13:22Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"x6XZW7HNQ7DKbalR0uT0kK6xMweAbSGiBMy3SpoazQW6YfA+hksIfNqUSWevJOTn9UyP32fk/aey1Z4NMSfAAQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-26T20:19:16.594870Z"},"content_sha256":"18df21e75281097728c7276b3c1810651f29343ef561c0a0101d36bb9023df83","schema_version":"1.0","event_id":"sha256:18df21e75281097728c7276b3c1810651f29343ef561c0a0101d36bb9023df83"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2018:APTRV3OQTR4GGZC3EUPTILBWHY","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Spatial social networks identified from urban group travel","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["cs.SI"],"primary_cat":"physics.soc-ph","authors_text":"Daqing Li, Haodong Yin, Hao Liu, Huijun Sun, Jianjun Wu, Kangli Zhu, Xin Yang, Yunchao Qu, Ziyou Gao","submitted_at":"2018-06-11T07:03:01Z","abstract_excerpt":"While the individual travel implicates the trace of individual mobility decision, group travels signify the possible social relationship behind these traces. Different from online social network, spatial interaction between individuals is a critical yet unknown dimension to understand the collective behaviors in a city. In this paper, based on over 127 million trips in Beijing metro network, we develop a method to distinguish the group travel of friends from the encounter travel of familiar strangers. We find travels of friends are among the most predictable groups. These identified friendship"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1806.03834","kind":"arxiv","version":1},"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":"2026-05-18T00:13:22Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"xiDN9aBF0dqcAt9SApqucxjRy5YSiR99Hi31DEG0Jn0br7jyuLTZ6B1QvX7/emwJI5cwCgy8Q6Rsnu0aoA4xAQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-26T20:19:16.595528Z"},"content_sha256":"f51306ee6bcf5aa48ff57e30159e8b67c1ae499dd8996071d459dc4133751209","schema_version":"1.0","event_id":"sha256:f51306ee6bcf5aa48ff57e30159e8b67c1ae499dd8996071d459dc4133751209"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/APTRV3OQTR4GGZC3EUPTILBWHY/bundle.json","state_url":"https://pith.science/pith/APTRV3OQTR4GGZC3EUPTILBWHY/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/APTRV3OQTR4GGZC3EUPTILBWHY/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":"2026-05-26T20:19:16Z","links":{"resolver":"https://pith.science/pith/APTRV3OQTR4GGZC3EUPTILBWHY","bundle":"https://pith.science/pith/APTRV3OQTR4GGZC3EUPTILBWHY/bundle.json","state":"https://pith.science/pith/APTRV3OQTR4GGZC3EUPTILBWHY/state.json","well_known_bundle":"https://pith.science/.well-known/pith/APTRV3OQTR4GGZC3EUPTILBWHY/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2018:APTRV3OQTR4GGZC3EUPTILBWHY","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":"7ce5353bbf97be27b334d130b746e32a8c5967fd81faacca8086c64f658a0997","cross_cats_sorted":["cs.SI"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.soc-ph","submitted_at":"2018-06-11T07:03:01Z","title_canon_sha256":"7e3df0ace126809c42fa70ef9190dbf2d8a3482f4ca63d2709bfb4e6fe2cb68d"},"schema_version":"1.0","source":{"id":"1806.03834","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1806.03834","created_at":"2026-05-18T00:13:22Z"},{"alias_kind":"arxiv_version","alias_value":"1806.03834v1","created_at":"2026-05-18T00:13:22Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1806.03834","created_at":"2026-05-18T00:13:22Z"},{"alias_kind":"pith_short_12","alias_value":"APTRV3OQTR4G","created_at":"2026-05-18T12:32:13Z"},{"alias_kind":"pith_short_16","alias_value":"APTRV3OQTR4GGZC3","created_at":"2026-05-18T12:32:13Z"},{"alias_kind":"pith_short_8","alias_value":"APTRV3OQ","created_at":"2026-05-18T12:32:13Z"}],"graph_snapshots":[{"event_id":"sha256:f51306ee6bcf5aa48ff57e30159e8b67c1ae499dd8996071d459dc4133751209","target":"graph","created_at":"2026-05-18T00:13:22Z","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":"While the individual travel implicates the trace of individual mobility decision, group travels signify the possible social relationship behind these traces. Different from online social network, spatial interaction between individuals is a critical yet unknown dimension to understand the collective behaviors in a city. In this paper, based on over 127 million trips in Beijing metro network, we develop a method to distinguish the group travel of friends from the encounter travel of familiar strangers. We find travels of friends are among the most predictable groups. These identified friendship","authors_text":"Daqing Li, Haodong Yin, Hao Liu, Huijun Sun, Jianjun Wu, Kangli Zhu, Xin Yang, Yunchao Qu, Ziyou Gao","cross_cats":["cs.SI"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.soc-ph","submitted_at":"2018-06-11T07:03:01Z","title":"Spatial social networks identified from urban group travel"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1806.03834","kind":"arxiv","version":1},"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":"sha256:18df21e75281097728c7276b3c1810651f29343ef561c0a0101d36bb9023df83","target":"record","created_at":"2026-05-18T00:13:22Z","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":"7ce5353bbf97be27b334d130b746e32a8c5967fd81faacca8086c64f658a0997","cross_cats_sorted":["cs.SI"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.soc-ph","submitted_at":"2018-06-11T07:03:01Z","title_canon_sha256":"7e3df0ace126809c42fa70ef9190dbf2d8a3482f4ca63d2709bfb4e6fe2cb68d"},"schema_version":"1.0","source":{"id":"1806.03834","kind":"arxiv","version":1}},"canonical_sha256":"03e71aedd09c7863645b251f342c363e25e41219189e5e756ea9bb3534b3c538","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"03e71aedd09c7863645b251f342c363e25e41219189e5e756ea9bb3534b3c538","first_computed_at":"2026-05-18T00:13:22.532882Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:13:22.532882Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"QQ31iz41i9qjbFRN3ovB4KfQqW5dnwEmkpaFRjt6lBOXJG1sDlrSa9ITLtMMD0Rejvn7rcFnaldLg136AbPZDA==","signature_status":"signed_v1","signed_at":"2026-05-18T00:13:22.533606Z","signed_message":"canonical_sha256_bytes"},"source_id":"1806.03834","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:18df21e75281097728c7276b3c1810651f29343ef561c0a0101d36bb9023df83","sha256:f51306ee6bcf5aa48ff57e30159e8b67c1ae499dd8996071d459dc4133751209"],"state_sha256":"c6289faefe16955f2a9a40f3b0590ecab899f0e9777506bb5e6a0d5b46e2d0dc"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"t1BgXnsh6R4PBw9LEFVQfPOfADLjC2aELMdqivF40+1PW6hYI8lCASwKGFB6qWXnC6HzQBHZMT33ylXfvWpECQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-26T20:19:16.597807Z","bundle_sha256":"0e35e217ebf90c866597b89b6f22d3f2bef299f92434409a93c376ef563e3f63"}}