{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2020:XLDIISQ4ZVABO4NFPQ7UZZ3YDD","short_pith_number":"pith:XLDIISQ4","canonical_record":{"source":{"id":"2009.05126","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"cs.CR","submitted_at":"2020-09-10T19:54:49Z","cross_cats_sorted":[],"title_canon_sha256":"5b04c12a19d5418f99ad3e54a8b510cc2b02a292e79a5f4f8b45d52386fa3aea","abstract_canon_sha256":"ad52749516fa120d7e5a6ffa6f33482a7555a84e5c2472dc8d6644aff963b8fa"},"schema_version":"1.0"},"canonical_sha256":"bac6844a1ccd401771a57c3f4ce77818cf45ac84c72a51a4a61121853178d384","source":{"kind":"arxiv","id":"2009.05126","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2009.05126","created_at":"2026-07-05T01:36:32Z"},{"alias_kind":"arxiv_version","alias_value":"2009.05126v1","created_at":"2026-07-05T01:36:32Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2009.05126","created_at":"2026-07-05T01:36:32Z"},{"alias_kind":"pith_short_12","alias_value":"XLDIISQ4ZVAB","created_at":"2026-07-05T01:36:32Z"},{"alias_kind":"pith_short_16","alias_value":"XLDIISQ4ZVABO4NF","created_at":"2026-07-05T01:36:32Z"},{"alias_kind":"pith_short_8","alias_value":"XLDIISQ4","created_at":"2026-07-05T01:36:32Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2020:XLDIISQ4ZVABO4NFPQ7UZZ3YDD","target":"record","payload":{"canonical_record":{"source":{"id":"2009.05126","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"cs.CR","submitted_at":"2020-09-10T19:54:49Z","cross_cats_sorted":[],"title_canon_sha256":"5b04c12a19d5418f99ad3e54a8b510cc2b02a292e79a5f4f8b45d52386fa3aea","abstract_canon_sha256":"ad52749516fa120d7e5a6ffa6f33482a7555a84e5c2472dc8d6644aff963b8fa"},"schema_version":"1.0"},"canonical_sha256":"bac6844a1ccd401771a57c3f4ce77818cf45ac84c72a51a4a61121853178d384","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T01:36:32.165098Z","signature_b64":"KkbsXfi0mUyuHHw1FVgbmpGx3cQiJ2ChlsILX0edUULaBhJOEAXCRMTPElPbpEWyBWwFegkwDKcUDEdljET+Cw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"bac6844a1ccd401771a57c3f4ce77818cf45ac84c72a51a4a61121853178d384","last_reissued_at":"2026-07-05T01:36:32.164639Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T01:36:32.164639Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2009.05126","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":"2026-07-05T01:36:32Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"hUD8e1ZBfUGysJXWmHT2tjDVB1zb5/Tee1EYy48Nh0/FV3MalapQJffTwDW52vdgR4Ted6u+h8T8XDtq7TFBBw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-07T05:12:53.064278Z"},"content_sha256":"7327f469f6755e272a9e6016679e8ab1f60260bf03c03699345e167b0956fac4","schema_version":"1.0","event_id":"sha256:7327f469f6755e272a9e6016679e8ab1f60260bf03c03699345e167b0956fac4"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2020:XLDIISQ4ZVABO4NFPQ7UZZ3YDD","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Review and Critical Analysis of Privacy-preserving Infection Tracking and Contact Tracing","license":"http://creativecommons.org/licenses/by/4.0/","headline":"","cross_cats":[],"primary_cat":"cs.CR","authors_text":"Christos Chrysoulas, David Haynes, Lei Zhang, Masood Ur-Rehman, Muhammad Ali Imran, Nikolaos Pitropakis, Pavlos Papadopoulos, Qammer H. Abbasi, William J Buchanan","submitted_at":"2020-09-10T19:54:49Z","abstract_excerpt":"The outbreak of viruses have necessitated contact tracing and infection tracking methods. Despite various efforts, there is currently no standard scheme for the tracing and tracking. Many nations of the world have therefore, developed their own ways where carriers of disease could be tracked and their contacts traced. These are generalized methods developed either in a distributed manner giving citizens control of their identity or in a centralised manner where a health authority gathers data on those who are carriers. This paper outlines some of the most significant approaches that have been "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2009.05126","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/2009.05126/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":"2026-07-05T01:36:32Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"Q4tdhiXnRyu4b0CVGrW0PwUoL1W7y44OppyBkSevfRopbF5djMYyjl3PJuAjXpaUqUZHR4bym/vZqEf6EKH8BQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-07T05:12:53.064936Z"},"content_sha256":"e7b32116e32069ff8c59103a2168e22e45591dd83d0cf9c6d8164218e3c2fe66","schema_version":"1.0","event_id":"sha256:e7b32116e32069ff8c59103a2168e22e45591dd83d0cf9c6d8164218e3c2fe66"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/XLDIISQ4ZVABO4NFPQ7UZZ3YDD/bundle.json","state_url":"https://pith.science/pith/XLDIISQ4ZVABO4NFPQ7UZZ3YDD/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/XLDIISQ4ZVABO4NFPQ7UZZ3YDD/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":"2026-08-07T05:12:53Z","links":{"resolver":"https://pith.science/pith/XLDIISQ4ZVABO4NFPQ7UZZ3YDD","bundle":"https://pith.science/pith/XLDIISQ4ZVABO4NFPQ7UZZ3YDD/bundle.json","state":"https://pith.science/pith/XLDIISQ4ZVABO4NFPQ7UZZ3YDD/state.json","well_known_bundle":"https://pith.science/.well-known/pith/XLDIISQ4ZVABO4NFPQ7UZZ3YDD/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2020:XLDIISQ4ZVABO4NFPQ7UZZ3YDD","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":"ad52749516fa120d7e5a6ffa6f33482a7555a84e5c2472dc8d6644aff963b8fa","cross_cats_sorted":[],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"cs.CR","submitted_at":"2020-09-10T19:54:49Z","title_canon_sha256":"5b04c12a19d5418f99ad3e54a8b510cc2b02a292e79a5f4f8b45d52386fa3aea"},"schema_version":"1.0","source":{"id":"2009.05126","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2009.05126","created_at":"2026-07-05T01:36:32Z"},{"alias_kind":"arxiv_version","alias_value":"2009.05126v1","created_at":"2026-07-05T01:36:32Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2009.05126","created_at":"2026-07-05T01:36:32Z"},{"alias_kind":"pith_short_12","alias_value":"XLDIISQ4ZVAB","created_at":"2026-07-05T01:36:32Z"},{"alias_kind":"pith_short_16","alias_value":"XLDIISQ4ZVABO4NF","created_at":"2026-07-05T01:36:32Z"},{"alias_kind":"pith_short_8","alias_value":"XLDIISQ4","created_at":"2026-07-05T01:36:32Z"}],"graph_snapshots":[{"event_id":"sha256:e7b32116e32069ff8c59103a2168e22e45591dd83d0cf9c6d8164218e3c2fe66","target":"graph","created_at":"2026-07-05T01:36:32Z","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/2009.05126/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"The outbreak of viruses have necessitated contact tracing and infection tracking methods. Despite various efforts, there is currently no standard scheme for the tracing and tracking. Many nations of the world have therefore, developed their own ways where carriers of disease could be tracked and their contacts traced. These are generalized methods developed either in a distributed manner giving citizens control of their identity or in a centralised manner where a health authority gathers data on those who are carriers. This paper outlines some of the most significant approaches that have been ","authors_text":"Christos Chrysoulas, David Haynes, Lei Zhang, Masood Ur-Rehman, Muhammad Ali Imran, Nikolaos Pitropakis, Pavlos Papadopoulos, Qammer H. Abbasi, William J Buchanan","cross_cats":[],"headline":"","license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"cs.CR","submitted_at":"2020-09-10T19:54:49Z","title":"Review and Critical Analysis of Privacy-preserving Infection Tracking and Contact Tracing"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2009.05126","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":"sha256:7327f469f6755e272a9e6016679e8ab1f60260bf03c03699345e167b0956fac4","target":"record","created_at":"2026-07-05T01:36:32Z","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":"ad52749516fa120d7e5a6ffa6f33482a7555a84e5c2472dc8d6644aff963b8fa","cross_cats_sorted":[],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"cs.CR","submitted_at":"2020-09-10T19:54:49Z","title_canon_sha256":"5b04c12a19d5418f99ad3e54a8b510cc2b02a292e79a5f4f8b45d52386fa3aea"},"schema_version":"1.0","source":{"id":"2009.05126","kind":"arxiv","version":1}},"canonical_sha256":"bac6844a1ccd401771a57c3f4ce77818cf45ac84c72a51a4a61121853178d384","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"bac6844a1ccd401771a57c3f4ce77818cf45ac84c72a51a4a61121853178d384","first_computed_at":"2026-07-05T01:36:32.164639Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T01:36:32.164639Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"KkbsXfi0mUyuHHw1FVgbmpGx3cQiJ2ChlsILX0edUULaBhJOEAXCRMTPElPbpEWyBWwFegkwDKcUDEdljET+Cw==","signature_status":"signed_v1","signed_at":"2026-07-05T01:36:32.165098Z","signed_message":"canonical_sha256_bytes"},"source_id":"2009.05126","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:7327f469f6755e272a9e6016679e8ab1f60260bf03c03699345e167b0956fac4","sha256:e7b32116e32069ff8c59103a2168e22e45591dd83d0cf9c6d8164218e3c2fe66"],"state_sha256":"f35d4d9bff93643d4f7dd1f1ac4b9f8cc4a25eb118053c660f76804683381e91"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"iaajeKcg32/3YLU1GQf9wlGSAF0pUOQrvHT4Jot75nLPVlUjtasTYjKDkpZIglIGd7/SfOpbCIYSfN1H/CMsDg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-07T05:12:53.069288Z","bundle_sha256":"e2a8aa355306a1fba10d578a81cf4839a35570e222cb7942908861c377ba4678"}}