{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2020:IB7XGDTLGHOGC4QWQLGMT2MFEE","short_pith_number":"pith:IB7XGDTL","canonical_record":{"source":{"id":"2004.08851","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.IR","submitted_at":"2020-04-19T13:34:16Z","cross_cats_sorted":["cs.LG","cs.SI"],"title_canon_sha256":"0439ddea36faac9ea5244dc262b77ef9addce7d217d7d1cf7bbc2ac43cbf14df","abstract_canon_sha256":"bf2ed8e2b496a0c6f5afd4f6edc9134b8b59167299eaea6bc61d68ef35ba94de"},"schema_version":"1.0"},"canonical_sha256":"407f730e6b31dc61721682ccc9e9852126e534595485a31ad0cfd05e00adb011","source":{"kind":"arxiv","id":"2004.08851","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2004.08851","created_at":"2026-07-05T01:40:26Z"},{"alias_kind":"arxiv_version","alias_value":"2004.08851v2","created_at":"2026-07-05T01:40:26Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2004.08851","created_at":"2026-07-05T01:40:26Z"},{"alias_kind":"pith_short_12","alias_value":"IB7XGDTLGHOG","created_at":"2026-07-05T01:40:26Z"},{"alias_kind":"pith_short_16","alias_value":"IB7XGDTLGHOGC4QW","created_at":"2026-07-05T01:40:26Z"},{"alias_kind":"pith_short_8","alias_value":"IB7XGDTL","created_at":"2026-07-05T01:40:26Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2020:IB7XGDTLGHOGC4QWQLGMT2MFEE","target":"record","payload":{"canonical_record":{"source":{"id":"2004.08851","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.IR","submitted_at":"2020-04-19T13:34:16Z","cross_cats_sorted":["cs.LG","cs.SI"],"title_canon_sha256":"0439ddea36faac9ea5244dc262b77ef9addce7d217d7d1cf7bbc2ac43cbf14df","abstract_canon_sha256":"bf2ed8e2b496a0c6f5afd4f6edc9134b8b59167299eaea6bc61d68ef35ba94de"},"schema_version":"1.0"},"canonical_sha256":"407f730e6b31dc61721682ccc9e9852126e534595485a31ad0cfd05e00adb011","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T01:40:26.677374Z","signature_b64":"9sxLITFLmnB8esn4JBA9jl6gkLz0DFL/RkBAl11NFSeyES+Zdz1l4MAMv9rflVLqn6zNR54/trEmuZyOC999DA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"407f730e6b31dc61721682ccc9e9852126e534595485a31ad0cfd05e00adb011","last_reissued_at":"2026-07-05T01:40:26.676911Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T01:40:26.676911Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2004.08851","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":"2026-07-05T01:40:26Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"0BukeWOe6AWXUvgqBLlmZaUxp5cJB1pxAsgslnMiYs3bpkDUJgAiIfT5MyQaVKVhx4hlGOxbxmBWGNXDe0kHBg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-08T20:50:29.248907Z"},"content_sha256":"67bace761c1f4b8952aa2ff365e31a14c5e68d087e2b5e6f38cfd3d801a9cb10","schema_version":"1.0","event_id":"sha256:67bace761c1f4b8952aa2ff365e31a14c5e68d087e2b5e6f38cfd3d801a9cb10"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2020:IB7XGDTLGHOGC4QWQLGMT2MFEE","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Approximate Nearest Neighbour Search on Privacy-aware Encoding of User Locations to Identify Susceptible Infections in Simulated Epidemics","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["cs.LG","cs.SI"],"primary_cat":"cs.IR","authors_text":"Chandan Biswas, Debasis Ganguly, Ujjwal Bhattacharya","submitted_at":"2020-04-19T13:34:16Z","abstract_excerpt":"Amidst an increasing number of infected cases during the Covid-19 pandemic, it is essential to trace, as early as possible, the susceptible people who might have been infected by the disease due to their close proximity with people who were tested positive for the virus. This early contact tracing is likely to limit the rate of spread of the infection within a locality. In this paper, we investigate how effectively and efficiently can such a list of susceptible people be found given a list of infected persons and their locations. To address this problem from an information retrieval (search) p"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2004.08851","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":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/2004.08851/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":"2026-07-05T01:40:26Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"ApO4OFBnPTBssMUCus94PEPDLnTkKoEREhcLra5jKZ9dJxqtlNOm1JA3UdMFdOY/UaI1g2FRyUbsVkLkckBhCg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-08T20:50:29.249288Z"},"content_sha256":"cbfed28e5cd644d9352a47e37f2263300b7fac083b516e7095566ea48094eee6","schema_version":"1.0","event_id":"sha256:cbfed28e5cd644d9352a47e37f2263300b7fac083b516e7095566ea48094eee6"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/IB7XGDTLGHOGC4QWQLGMT2MFEE/bundle.json","state_url":"https://pith.science/pith/IB7XGDTLGHOGC4QWQLGMT2MFEE/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/IB7XGDTLGHOGC4QWQLGMT2MFEE/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":"2026-07-08T20:50:29Z","links":{"resolver":"https://pith.science/pith/IB7XGDTLGHOGC4QWQLGMT2MFEE","bundle":"https://pith.science/pith/IB7XGDTLGHOGC4QWQLGMT2MFEE/bundle.json","state":"https://pith.science/pith/IB7XGDTLGHOGC4QWQLGMT2MFEE/state.json","well_known_bundle":"https://pith.science/.well-known/pith/IB7XGDTLGHOGC4QWQLGMT2MFEE/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2020:IB7XGDTLGHOGC4QWQLGMT2MFEE","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":"bf2ed8e2b496a0c6f5afd4f6edc9134b8b59167299eaea6bc61d68ef35ba94de","cross_cats_sorted":["cs.LG","cs.SI"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.IR","submitted_at":"2020-04-19T13:34:16Z","title_canon_sha256":"0439ddea36faac9ea5244dc262b77ef9addce7d217d7d1cf7bbc2ac43cbf14df"},"schema_version":"1.0","source":{"id":"2004.08851","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2004.08851","created_at":"2026-07-05T01:40:26Z"},{"alias_kind":"arxiv_version","alias_value":"2004.08851v2","created_at":"2026-07-05T01:40:26Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2004.08851","created_at":"2026-07-05T01:40:26Z"},{"alias_kind":"pith_short_12","alias_value":"IB7XGDTLGHOG","created_at":"2026-07-05T01:40:26Z"},{"alias_kind":"pith_short_16","alias_value":"IB7XGDTLGHOGC4QW","created_at":"2026-07-05T01:40:26Z"},{"alias_kind":"pith_short_8","alias_value":"IB7XGDTL","created_at":"2026-07-05T01:40:26Z"}],"graph_snapshots":[{"event_id":"sha256:cbfed28e5cd644d9352a47e37f2263300b7fac083b516e7095566ea48094eee6","target":"graph","created_at":"2026-07-05T01:40:26Z","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/2004.08851/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"Amidst an increasing number of infected cases during the Covid-19 pandemic, it is essential to trace, as early as possible, the susceptible people who might have been infected by the disease due to their close proximity with people who were tested positive for the virus. This early contact tracing is likely to limit the rate of spread of the infection within a locality. In this paper, we investigate how effectively and efficiently can such a list of susceptible people be found given a list of infected persons and their locations. To address this problem from an information retrieval (search) p","authors_text":"Chandan Biswas, Debasis Ganguly, Ujjwal Bhattacharya","cross_cats":["cs.LG","cs.SI"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.IR","submitted_at":"2020-04-19T13:34:16Z","title":"Approximate Nearest Neighbour Search on Privacy-aware Encoding of User Locations to Identify Susceptible Infections in Simulated Epidemics"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2004.08851","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":"sha256:67bace761c1f4b8952aa2ff365e31a14c5e68d087e2b5e6f38cfd3d801a9cb10","target":"record","created_at":"2026-07-05T01:40:26Z","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":"bf2ed8e2b496a0c6f5afd4f6edc9134b8b59167299eaea6bc61d68ef35ba94de","cross_cats_sorted":["cs.LG","cs.SI"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.IR","submitted_at":"2020-04-19T13:34:16Z","title_canon_sha256":"0439ddea36faac9ea5244dc262b77ef9addce7d217d7d1cf7bbc2ac43cbf14df"},"schema_version":"1.0","source":{"id":"2004.08851","kind":"arxiv","version":2}},"canonical_sha256":"407f730e6b31dc61721682ccc9e9852126e534595485a31ad0cfd05e00adb011","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"407f730e6b31dc61721682ccc9e9852126e534595485a31ad0cfd05e00adb011","first_computed_at":"2026-07-05T01:40:26.676911Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T01:40:26.676911Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"9sxLITFLmnB8esn4JBA9jl6gkLz0DFL/RkBAl11NFSeyES+Zdz1l4MAMv9rflVLqn6zNR54/trEmuZyOC999DA==","signature_status":"signed_v1","signed_at":"2026-07-05T01:40:26.677374Z","signed_message":"canonical_sha256_bytes"},"source_id":"2004.08851","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:67bace761c1f4b8952aa2ff365e31a14c5e68d087e2b5e6f38cfd3d801a9cb10","sha256:cbfed28e5cd644d9352a47e37f2263300b7fac083b516e7095566ea48094eee6"],"state_sha256":"d9c44ff0692479add1cf0ce18237ed65d6331ab1cacfb2a5dff0d6b980e8cb23"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"Bzo//amzN3KLxWbhoyROy9KoQ4hb7dHTZo4yvo61zmS3N2Cd4RXP8BOPRjG/HlxKCxcK4gSpcp42Xa/ff104Cg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-07-08T20:50:29.251371Z","bundle_sha256":"e3a516da47cd09e4ff6d8a883f41e30ea0166b8d54d21948a2fe5420bc06b406"}}