{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2025:X76LCD2DWYAP5OJGXAVYAB46AO","short_pith_number":"pith:X76LCD2D","canonical_record":{"source":{"id":"2502.14649","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"physics.soc-ph","submitted_at":"2025-02-20T15:38:59Z","cross_cats_sorted":[],"title_canon_sha256":"eb0f1f9b3e69fb9561bb2710f04ecba7efbc2d8f8a68810e3dff9f9a324dcba1","abstract_canon_sha256":"6d6bdd0068398525d85fe1fbca753a352ef88b561d71ca26a9f2ba1c4f6f071e"},"schema_version":"1.0"},"canonical_sha256":"bffcb10f43b600feb926b82b80079e03963d472b0778d0d02c432e74ea72d107","source":{"kind":"arxiv","id":"2502.14649","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2502.14649","created_at":"2026-07-05T10:17:30Z"},{"alias_kind":"arxiv_version","alias_value":"2502.14649v1","created_at":"2026-07-05T10:17:30Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2502.14649","created_at":"2026-07-05T10:17:30Z"},{"alias_kind":"pith_short_12","alias_value":"X76LCD2DWYAP","created_at":"2026-07-05T10:17:30Z"},{"alias_kind":"pith_short_16","alias_value":"X76LCD2DWYAP5OJG","created_at":"2026-07-05T10:17:30Z"},{"alias_kind":"pith_short_8","alias_value":"X76LCD2D","created_at":"2026-07-05T10:17:30Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2025:X76LCD2DWYAP5OJGXAVYAB46AO","target":"record","payload":{"canonical_record":{"source":{"id":"2502.14649","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"physics.soc-ph","submitted_at":"2025-02-20T15:38:59Z","cross_cats_sorted":[],"title_canon_sha256":"eb0f1f9b3e69fb9561bb2710f04ecba7efbc2d8f8a68810e3dff9f9a324dcba1","abstract_canon_sha256":"6d6bdd0068398525d85fe1fbca753a352ef88b561d71ca26a9f2ba1c4f6f071e"},"schema_version":"1.0"},"canonical_sha256":"bffcb10f43b600feb926b82b80079e03963d472b0778d0d02c432e74ea72d107","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T10:17:30.596892Z","signature_b64":"T3nf/HkIrTo7uFKrJ2CQWDnE/VDV8R+mDW6F8QJo3CuNnZrj7fDkroPG7WTXSMZxsrj34kygPDNgT5mRQ71CBg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"bffcb10f43b600feb926b82b80079e03963d472b0778d0d02c432e74ea72d107","last_reissued_at":"2026-07-05T10:17:30.596431Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T10:17:30.596431Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2502.14649","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":"2026-07-05T10:17:30Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"HQ7KUmuPjPX+mUtJsgmWC5UgBnHXFoxbLuv9cqbPz3HBlm5ylVPZWm18R3G1WRoipkStqAupUbcnZ+Owg7g8Dw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-06T18:15:22.770680Z"},"content_sha256":"3fb527d68fae03a12c76dc3b4c2cf97dc3cbdcad265b08706cf2fbe6f2ebf20f","schema_version":"1.0","event_id":"sha256:3fb527d68fae03a12c76dc3b4c2cf97dc3cbdcad265b08706cf2fbe6f2ebf20f"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2025:X76LCD2DWYAP5OJGXAVYAB46AO","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Understanding infection risks of COVID-19 in the city: an investigation of infected neighborhoods in Wuhan","license":"http://creativecommons.org/licenses/by/4.0/","headline":"","cross_cats":[],"primary_cat":"physics.soc-ph","authors_text":"Weipan Xu, Xun Li, Ying Li","submitted_at":"2025-02-20T15:38:59Z","abstract_excerpt":"During the COVID-19 pandemic, built environments in dense urban settings become major sources of infection. This study tests the difference of demographics and surrounding built environments across high-, medium- and low-infection neighborhoods, to inform the high-risk areas in the city. We found that high-infection neighborhoods own a higher ratio of aged population than other neighborhoods on average. However, it shows no statistical difference in terms of population density. Additionally, high-infection neighborhoods are closer to high-risk built environments than the others. In a walking d"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2502.14649","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":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/2502.14649/integrity.json","findings":[],"available":true,"detectors_run":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938"},"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":"2026-07-05T10:17:30Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"9csKNO5Qo/4TXkhb2rWVItas7h8kq6g7E6EVUN00DgGqlmutsnYMUrKXTuikT/SOfkN3u5VYHCbxuhY5x5bxAQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-06T18:15:22.771048Z"},"content_sha256":"c92fb22a2dfef0ca81bc819013459a92697319b28e18604c69f2f94b2ac3a933","schema_version":"1.0","event_id":"sha256:c92fb22a2dfef0ca81bc819013459a92697319b28e18604c69f2f94b2ac3a933"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/X76LCD2DWYAP5OJGXAVYAB46AO/bundle.json","state_url":"https://pith.science/pith/X76LCD2DWYAP5OJGXAVYAB46AO/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/X76LCD2DWYAP5OJGXAVYAB46AO/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":"2026-07-06T18:15:22Z","links":{"resolver":"https://pith.science/pith/X76LCD2DWYAP5OJGXAVYAB46AO","bundle":"https://pith.science/pith/X76LCD2DWYAP5OJGXAVYAB46AO/bundle.json","state":"https://pith.science/pith/X76LCD2DWYAP5OJGXAVYAB46AO/state.json","well_known_bundle":"https://pith.science/.well-known/pith/X76LCD2DWYAP5OJGXAVYAB46AO/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2025:X76LCD2DWYAP5OJGXAVYAB46AO","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":"6d6bdd0068398525d85fe1fbca753a352ef88b561d71ca26a9f2ba1c4f6f071e","cross_cats_sorted":[],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"physics.soc-ph","submitted_at":"2025-02-20T15:38:59Z","title_canon_sha256":"eb0f1f9b3e69fb9561bb2710f04ecba7efbc2d8f8a68810e3dff9f9a324dcba1"},"schema_version":"1.0","source":{"id":"2502.14649","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2502.14649","created_at":"2026-07-05T10:17:30Z"},{"alias_kind":"arxiv_version","alias_value":"2502.14649v1","created_at":"2026-07-05T10:17:30Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2502.14649","created_at":"2026-07-05T10:17:30Z"},{"alias_kind":"pith_short_12","alias_value":"X76LCD2DWYAP","created_at":"2026-07-05T10:17:30Z"},{"alias_kind":"pith_short_16","alias_value":"X76LCD2DWYAP5OJG","created_at":"2026-07-05T10:17:30Z"},{"alias_kind":"pith_short_8","alias_value":"X76LCD2D","created_at":"2026-07-05T10:17:30Z"}],"graph_snapshots":[{"event_id":"sha256:c92fb22a2dfef0ca81bc819013459a92697319b28e18604c69f2f94b2ac3a933","target":"graph","created_at":"2026-07-05T10:17:30Z","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"},"integrity":{"available":true,"clean":true,"detectors_run":[],"endpoint":"/pith/2502.14649/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"During the COVID-19 pandemic, built environments in dense urban settings become major sources of infection. This study tests the difference of demographics and surrounding built environments across high-, medium- and low-infection neighborhoods, to inform the high-risk areas in the city. We found that high-infection neighborhoods own a higher ratio of aged population than other neighborhoods on average. However, it shows no statistical difference in terms of population density. Additionally, high-infection neighborhoods are closer to high-risk built environments than the others. In a walking d","authors_text":"Weipan Xu, Xun Li, Ying Li","cross_cats":[],"headline":"","license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"physics.soc-ph","submitted_at":"2025-02-20T15:38:59Z","title":"Understanding infection risks of COVID-19 in the city: an investigation of infected neighborhoods in Wuhan"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2502.14649","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":"sha256:3fb527d68fae03a12c76dc3b4c2cf97dc3cbdcad265b08706cf2fbe6f2ebf20f","target":"record","created_at":"2026-07-05T10:17:30Z","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":"6d6bdd0068398525d85fe1fbca753a352ef88b561d71ca26a9f2ba1c4f6f071e","cross_cats_sorted":[],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"physics.soc-ph","submitted_at":"2025-02-20T15:38:59Z","title_canon_sha256":"eb0f1f9b3e69fb9561bb2710f04ecba7efbc2d8f8a68810e3dff9f9a324dcba1"},"schema_version":"1.0","source":{"id":"2502.14649","kind":"arxiv","version":1}},"canonical_sha256":"bffcb10f43b600feb926b82b80079e03963d472b0778d0d02c432e74ea72d107","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"bffcb10f43b600feb926b82b80079e03963d472b0778d0d02c432e74ea72d107","first_computed_at":"2026-07-05T10:17:30.596431Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T10:17:30.596431Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"T3nf/HkIrTo7uFKrJ2CQWDnE/VDV8R+mDW6F8QJo3CuNnZrj7fDkroPG7WTXSMZxsrj34kygPDNgT5mRQ71CBg==","signature_status":"signed_v1","signed_at":"2026-07-05T10:17:30.596892Z","signed_message":"canonical_sha256_bytes"},"source_id":"2502.14649","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:3fb527d68fae03a12c76dc3b4c2cf97dc3cbdcad265b08706cf2fbe6f2ebf20f","sha256:c92fb22a2dfef0ca81bc819013459a92697319b28e18604c69f2f94b2ac3a933"],"state_sha256":"6f591f54f1d9fd5b370e04443b569cba3eb42bc76fea4a090501c3e7d7abbbc8"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"/OJ3uDjNKpaiGVXWcaW5cHrtDS9Qp8mzP+EmLR4kkjvnmmzxyABEo/4knVz1lfjaa+PxlWZIoG0anUOQGlkrBw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-07-06T18:15:22.773010Z","bundle_sha256":"fd009d158b3e9169687d2d99341664759bf09972cd6ab88ae9496e5bd74605ab"}}