{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2014:V3ZKA6O46J3N5AMKWIBXPKA7OS","short_pith_number":"pith:V3ZKA6O4","canonical_record":{"source":{"id":"1401.2815","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.soc-ph","submitted_at":"2014-01-13T12:34:19Z","cross_cats_sorted":["cs.SI"],"title_canon_sha256":"8718a913c85455046693154797bf286db8ac6b79465ce38b65ba63cb881941ff","abstract_canon_sha256":"83f9e913b4a57817a3a2c1d35554c7b305039d08d6dd17512b03d826cac5ddf4"},"schema_version":"1.0"},"canonical_sha256":"aef2a079dcf276de818ab20377a81f748644601e9b61d560eb4514e5bcd5a531","source":{"kind":"arxiv","id":"1401.2815","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1401.2815","created_at":"2026-05-18T02:51:41Z"},{"alias_kind":"arxiv_version","alias_value":"1401.2815v2","created_at":"2026-05-18T02:51:41Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1401.2815","created_at":"2026-05-18T02:51:41Z"},{"alias_kind":"pith_short_12","alias_value":"V3ZKA6O46J3N","created_at":"2026-05-18T12:28:52Z"},{"alias_kind":"pith_short_16","alias_value":"V3ZKA6O46J3N5AMK","created_at":"2026-05-18T12:28:52Z"},{"alias_kind":"pith_short_8","alias_value":"V3ZKA6O4","created_at":"2026-05-18T12:28:52Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2014:V3ZKA6O46J3N5AMKWIBXPKA7OS","target":"record","payload":{"canonical_record":{"source":{"id":"1401.2815","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.soc-ph","submitted_at":"2014-01-13T12:34:19Z","cross_cats_sorted":["cs.SI"],"title_canon_sha256":"8718a913c85455046693154797bf286db8ac6b79465ce38b65ba63cb881941ff","abstract_canon_sha256":"83f9e913b4a57817a3a2c1d35554c7b305039d08d6dd17512b03d826cac5ddf4"},"schema_version":"1.0"},"canonical_sha256":"aef2a079dcf276de818ab20377a81f748644601e9b61d560eb4514e5bcd5a531","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T02:51:41.770745Z","signature_b64":"YHjA3urKbEHFtIEM1w12ddyL0gQk0Vb2Kfn0MutEQ3P7MlOjr+v6m6sXD7s49WdXwF6eMJILCIu63Nbsfy2NDQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"aef2a079dcf276de818ab20377a81f748644601e9b61d560eb4514e5bcd5a531","last_reissued_at":"2026-05-18T02:51:41.770093Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T02:51:41.770093Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1401.2815","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":"2026-05-18T02:51:41Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"zvY+8mO/IPv/BUU/T0D/MmosK1p71WROzqAyZsFPFT7wRW8lsjNM7lDHaXsF1dK9aC62SmNZJuXo6Er/a4EGBQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-21T14:22:01.764267Z"},"content_sha256":"7d4794203624fe6fbd2ec0e5f9001c5f9b748d2ef7480d9caa59a1ca30426280","schema_version":"1.0","event_id":"sha256:7d4794203624fe6fbd2ec0e5f9001c5f9b748d2ef7480d9caa59a1ca30426280"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2014:V3ZKA6O46J3N5AMKWIBXPKA7OS","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Efficient detection of contagious outbreaks in massive metropolitan encounter networks","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["cs.SI"],"primary_cat":"physics.soc-ph","authors_text":"Der-Horng Lee, Kay W. Axhausen, Lijun Sun, Manuel Cebrian","submitted_at":"2014-01-13T12:34:19Z","abstract_excerpt":"Physical contact remains difficult to trace in large metropolitan networks, though it is a key vehicle for the transmission of contagious outbreaks. Co-presence encounters during daily transit use provide us with a city-scale time-resolved physical contact network, consisting of 1 billion contacts among 3 million transit users. Here, we study the advantage that knowledge of such co-presence structures may provide for early detection of contagious outbreaks. We first examine the \"friend sensor\" scheme --- a simple, but universal strategy requiring only local information --- and demonstrate that"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1401.2815","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":"2026-05-18T02:51:41Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"bCLoxpYfrhFvCfat1hsCHVRv7JoZVvYSusavZXvbAiKmQb4kYI35mFXYDUuhkQiUacNoEb8+2zEw0rY7s8hCCQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-21T14:22:01.764639Z"},"content_sha256":"761f9c429f9c8ba1c4aad940a5610348622a0913518ad65c72a02f319411f7cd","schema_version":"1.0","event_id":"sha256:761f9c429f9c8ba1c4aad940a5610348622a0913518ad65c72a02f319411f7cd"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/V3ZKA6O46J3N5AMKWIBXPKA7OS/bundle.json","state_url":"https://pith.science/pith/V3ZKA6O46J3N5AMKWIBXPKA7OS/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/V3ZKA6O46J3N5AMKWIBXPKA7OS/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":"2026-06-21T14:22:01Z","links":{"resolver":"https://pith.science/pith/V3ZKA6O46J3N5AMKWIBXPKA7OS","bundle":"https://pith.science/pith/V3ZKA6O46J3N5AMKWIBXPKA7OS/bundle.json","state":"https://pith.science/pith/V3ZKA6O46J3N5AMKWIBXPKA7OS/state.json","well_known_bundle":"https://pith.science/.well-known/pith/V3ZKA6O46J3N5AMKWIBXPKA7OS/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2014:V3ZKA6O46J3N5AMKWIBXPKA7OS","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":"83f9e913b4a57817a3a2c1d35554c7b305039d08d6dd17512b03d826cac5ddf4","cross_cats_sorted":["cs.SI"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.soc-ph","submitted_at":"2014-01-13T12:34:19Z","title_canon_sha256":"8718a913c85455046693154797bf286db8ac6b79465ce38b65ba63cb881941ff"},"schema_version":"1.0","source":{"id":"1401.2815","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1401.2815","created_at":"2026-05-18T02:51:41Z"},{"alias_kind":"arxiv_version","alias_value":"1401.2815v2","created_at":"2026-05-18T02:51:41Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1401.2815","created_at":"2026-05-18T02:51:41Z"},{"alias_kind":"pith_short_12","alias_value":"V3ZKA6O46J3N","created_at":"2026-05-18T12:28:52Z"},{"alias_kind":"pith_short_16","alias_value":"V3ZKA6O46J3N5AMK","created_at":"2026-05-18T12:28:52Z"},{"alias_kind":"pith_short_8","alias_value":"V3ZKA6O4","created_at":"2026-05-18T12:28:52Z"}],"graph_snapshots":[{"event_id":"sha256:761f9c429f9c8ba1c4aad940a5610348622a0913518ad65c72a02f319411f7cd","target":"graph","created_at":"2026-05-18T02:51:41Z","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":"Physical contact remains difficult to trace in large metropolitan networks, though it is a key vehicle for the transmission of contagious outbreaks. Co-presence encounters during daily transit use provide us with a city-scale time-resolved physical contact network, consisting of 1 billion contacts among 3 million transit users. Here, we study the advantage that knowledge of such co-presence structures may provide for early detection of contagious outbreaks. We first examine the \"friend sensor\" scheme --- a simple, but universal strategy requiring only local information --- and demonstrate that","authors_text":"Der-Horng Lee, Kay W. Axhausen, Lijun Sun, Manuel Cebrian","cross_cats":["cs.SI"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.soc-ph","submitted_at":"2014-01-13T12:34:19Z","title":"Efficient detection of contagious outbreaks in massive metropolitan encounter networks"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1401.2815","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":"sha256:7d4794203624fe6fbd2ec0e5f9001c5f9b748d2ef7480d9caa59a1ca30426280","target":"record","created_at":"2026-05-18T02:51:41Z","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":"83f9e913b4a57817a3a2c1d35554c7b305039d08d6dd17512b03d826cac5ddf4","cross_cats_sorted":["cs.SI"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.soc-ph","submitted_at":"2014-01-13T12:34:19Z","title_canon_sha256":"8718a913c85455046693154797bf286db8ac6b79465ce38b65ba63cb881941ff"},"schema_version":"1.0","source":{"id":"1401.2815","kind":"arxiv","version":2}},"canonical_sha256":"aef2a079dcf276de818ab20377a81f748644601e9b61d560eb4514e5bcd5a531","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"aef2a079dcf276de818ab20377a81f748644601e9b61d560eb4514e5bcd5a531","first_computed_at":"2026-05-18T02:51:41.770093Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T02:51:41.770093Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"YHjA3urKbEHFtIEM1w12ddyL0gQk0Vb2Kfn0MutEQ3P7MlOjr+v6m6sXD7s49WdXwF6eMJILCIu63Nbsfy2NDQ==","signature_status":"signed_v1","signed_at":"2026-05-18T02:51:41.770745Z","signed_message":"canonical_sha256_bytes"},"source_id":"1401.2815","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:7d4794203624fe6fbd2ec0e5f9001c5f9b748d2ef7480d9caa59a1ca30426280","sha256:761f9c429f9c8ba1c4aad940a5610348622a0913518ad65c72a02f319411f7cd"],"state_sha256":"b0db442e58e382f7d5e24e2f2ec7deffe6b2cfc4a7852dc76b3cb283b6ed07c6"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"k0Lwks32OG8hMAeMAVvSqCkUbK6LzcvL/AIjfs5GENn/facLzwmEG/KTBGPyvgobTRCWlCV69UAJ1P+NH2cvCw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-21T14:22:01.766644Z","bundle_sha256":"d26a85aa961b8c63e770d72d70a59262ff227fe37e8574918b5d6f41527d2049"}}