{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2011:5CZNQMQWLOWU5FQDLGNUU5EKWG","short_pith_number":"pith:5CZNQMQW","canonical_record":{"source":{"id":"1101.4505","kind":"arxiv","version":2},"metadata":{"license":"http://creativecommons.org/licenses/by-nc-sa/3.0/","primary_cat":"physics.soc-ph","submitted_at":"2011-01-24T11:36:04Z","cross_cats_sorted":["cs.SI"],"title_canon_sha256":"45732d55731d0270d1672f1755424ef445aa46b646fa4d6eae139fcbf3eb4001","abstract_canon_sha256":"5df2c4b3ca77aa06d6b9dd435cefcbf546b4a770f00bb50016167ad2394da24b"},"schema_version":"1.0"},"canonical_sha256":"e8b2d832165bad4e9603599b4a748ab1b47c77037936ca4fb436651d62dcb1f3","source":{"kind":"arxiv","id":"1101.4505","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1101.4505","created_at":"2026-05-18T04:17:13Z"},{"alias_kind":"arxiv_version","alias_value":"1101.4505v2","created_at":"2026-05-18T04:17:13Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1101.4505","created_at":"2026-05-18T04:17:13Z"},{"alias_kind":"pith_short_12","alias_value":"5CZNQMQWLOWU","created_at":"2026-05-18T12:26:20Z"},{"alias_kind":"pith_short_16","alias_value":"5CZNQMQWLOWU5FQD","created_at":"2026-05-18T12:26:20Z"},{"alias_kind":"pith_short_8","alias_value":"5CZNQMQW","created_at":"2026-05-18T12:26:20Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2011:5CZNQMQWLOWU5FQDLGNUU5EKWG","target":"record","payload":{"canonical_record":{"source":{"id":"1101.4505","kind":"arxiv","version":2},"metadata":{"license":"http://creativecommons.org/licenses/by-nc-sa/3.0/","primary_cat":"physics.soc-ph","submitted_at":"2011-01-24T11:36:04Z","cross_cats_sorted":["cs.SI"],"title_canon_sha256":"45732d55731d0270d1672f1755424ef445aa46b646fa4d6eae139fcbf3eb4001","abstract_canon_sha256":"5df2c4b3ca77aa06d6b9dd435cefcbf546b4a770f00bb50016167ad2394da24b"},"schema_version":"1.0"},"canonical_sha256":"e8b2d832165bad4e9603599b4a748ab1b47c77037936ca4fb436651d62dcb1f3","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T04:17:13.504490Z","signature_b64":"NQ3IocPqoIbXUHLUqG7UCdaxTvQMItvLdV43l1yrPzOKNIA8Th86Se+wlt5g6e0sB6X/Tw2XMfA53JqybeH7CQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"e8b2d832165bad4e9603599b4a748ab1b47c77037936ca4fb436651d62dcb1f3","last_reissued_at":"2026-05-18T04:17:13.503832Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T04:17:13.503832Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1101.4505","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":"2026-05-18T04:17:13Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"0uFzH5Cymqkb6QwNX+slFfjLTfD/LwAXRC2sGcxQCVIcYJtWp/BFGe8d0i+dyLUUtaVXxCIyKLR9DKq6gfghCg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-01T07:59:43.303827Z"},"content_sha256":"e82ddc391ece72187e85fd206390b1ca98db809ae9ad3ae0c6a283ccb63296de","schema_version":"1.0","event_id":"sha256:e82ddc391ece72187e85fd206390b1ca98db809ae9ad3ae0c6a283ccb63296de"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2011:5CZNQMQWLOWU5FQDLGNUU5EKWG","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Interplay between telecommunications and face-to-face interactions - a study using mobile phone data","license":"http://creativecommons.org/licenses/by-nc-sa/3.0/","headline":"","cross_cats":["cs.SI"],"primary_cat":"physics.soc-ph","authors_text":"Carlo Ratti, Francesco Calabrese, Vincent D. Blondel, Zbigniew Smoreda","submitted_at":"2011-01-24T11:36:04Z","abstract_excerpt":"In this study we analyze one year of anonymized telecommunications data for over one million customers from a large European cellphone operator, and we investigate the relationship between people's calls and their physical location. We discover that more than 90% of users who have called each other have also shared the same space (cell tower), even if they live far apart. Moreover, we find that close to 70% of users who call each other frequently (at least once per month on average) have shared the same space at the same time - an instance that we call co-location. Co-locations appear indicati"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1101.4505","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":"2026-05-18T04:17:13Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"PgaTnY2u6AbhuMi55VMc252vL9KGsoom8zf7bORY3l9sw8lx2w82U8FHivPrfu2j2UJpF4LNk9mJHrjkLFRYAw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-01T07:59:43.304173Z"},"content_sha256":"e58bce32274354e2818356fed4d74f476287d48d083545ecd42838e5cc002976","schema_version":"1.0","event_id":"sha256:e58bce32274354e2818356fed4d74f476287d48d083545ecd42838e5cc002976"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/5CZNQMQWLOWU5FQDLGNUU5EKWG/bundle.json","state_url":"https://pith.science/pith/5CZNQMQWLOWU5FQDLGNUU5EKWG/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/5CZNQMQWLOWU5FQDLGNUU5EKWG/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":"2026-06-01T07:59:43Z","links":{"resolver":"https://pith.science/pith/5CZNQMQWLOWU5FQDLGNUU5EKWG","bundle":"https://pith.science/pith/5CZNQMQWLOWU5FQDLGNUU5EKWG/bundle.json","state":"https://pith.science/pith/5CZNQMQWLOWU5FQDLGNUU5EKWG/state.json","well_known_bundle":"https://pith.science/.well-known/pith/5CZNQMQWLOWU5FQDLGNUU5EKWG/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2011:5CZNQMQWLOWU5FQDLGNUU5EKWG","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":"5df2c4b3ca77aa06d6b9dd435cefcbf546b4a770f00bb50016167ad2394da24b","cross_cats_sorted":["cs.SI"],"license":"http://creativecommons.org/licenses/by-nc-sa/3.0/","primary_cat":"physics.soc-ph","submitted_at":"2011-01-24T11:36:04Z","title_canon_sha256":"45732d55731d0270d1672f1755424ef445aa46b646fa4d6eae139fcbf3eb4001"},"schema_version":"1.0","source":{"id":"1101.4505","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1101.4505","created_at":"2026-05-18T04:17:13Z"},{"alias_kind":"arxiv_version","alias_value":"1101.4505v2","created_at":"2026-05-18T04:17:13Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1101.4505","created_at":"2026-05-18T04:17:13Z"},{"alias_kind":"pith_short_12","alias_value":"5CZNQMQWLOWU","created_at":"2026-05-18T12:26:20Z"},{"alias_kind":"pith_short_16","alias_value":"5CZNQMQWLOWU5FQD","created_at":"2026-05-18T12:26:20Z"},{"alias_kind":"pith_short_8","alias_value":"5CZNQMQW","created_at":"2026-05-18T12:26:20Z"}],"graph_snapshots":[{"event_id":"sha256:e58bce32274354e2818356fed4d74f476287d48d083545ecd42838e5cc002976","target":"graph","created_at":"2026-05-18T04:17:13Z","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":"In this study we analyze one year of anonymized telecommunications data for over one million customers from a large European cellphone operator, and we investigate the relationship between people's calls and their physical location. We discover that more than 90% of users who have called each other have also shared the same space (cell tower), even if they live far apart. Moreover, we find that close to 70% of users who call each other frequently (at least once per month on average) have shared the same space at the same time - an instance that we call co-location. Co-locations appear indicati","authors_text":"Carlo Ratti, Francesco Calabrese, Vincent D. Blondel, Zbigniew Smoreda","cross_cats":["cs.SI"],"headline":"","license":"http://creativecommons.org/licenses/by-nc-sa/3.0/","primary_cat":"physics.soc-ph","submitted_at":"2011-01-24T11:36:04Z","title":"Interplay between telecommunications and face-to-face interactions - a study using mobile phone data"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1101.4505","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:e82ddc391ece72187e85fd206390b1ca98db809ae9ad3ae0c6a283ccb63296de","target":"record","created_at":"2026-05-18T04:17:13Z","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":"5df2c4b3ca77aa06d6b9dd435cefcbf546b4a770f00bb50016167ad2394da24b","cross_cats_sorted":["cs.SI"],"license":"http://creativecommons.org/licenses/by-nc-sa/3.0/","primary_cat":"physics.soc-ph","submitted_at":"2011-01-24T11:36:04Z","title_canon_sha256":"45732d55731d0270d1672f1755424ef445aa46b646fa4d6eae139fcbf3eb4001"},"schema_version":"1.0","source":{"id":"1101.4505","kind":"arxiv","version":2}},"canonical_sha256":"e8b2d832165bad4e9603599b4a748ab1b47c77037936ca4fb436651d62dcb1f3","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"e8b2d832165bad4e9603599b4a748ab1b47c77037936ca4fb436651d62dcb1f3","first_computed_at":"2026-05-18T04:17:13.503832Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T04:17:13.503832Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"NQ3IocPqoIbXUHLUqG7UCdaxTvQMItvLdV43l1yrPzOKNIA8Th86Se+wlt5g6e0sB6X/Tw2XMfA53JqybeH7CQ==","signature_status":"signed_v1","signed_at":"2026-05-18T04:17:13.504490Z","signed_message":"canonical_sha256_bytes"},"source_id":"1101.4505","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:e82ddc391ece72187e85fd206390b1ca98db809ae9ad3ae0c6a283ccb63296de","sha256:e58bce32274354e2818356fed4d74f476287d48d083545ecd42838e5cc002976"],"state_sha256":"957b05f6eca5bb2f1f59f49cb30df96cc66355be87df54fd9e7826723e260acc"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"H5gaeHfnFoFE0sjifkw14BeM6xdm7kXhTEQxuY8qfaB2eNc292E0pwvEdb6WPeXEc/xGK4xpvh0mCkLRHLHJBg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-01T07:59:43.306094Z","bundle_sha256":"ed05146c0a751038fe4f5ffb4a25bdcb82a1df1ebec4c2da688b843bfacd73c1"}}