{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2021:ZEVTPAMKXWGVRLUEV6T4U247MF","short_pith_number":"pith:ZEVTPAMK","canonical_record":{"source":{"id":"2104.09632","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.IR","submitted_at":"2021-04-19T20:49:45Z","cross_cats_sorted":[],"title_canon_sha256":"4e95a159239d7e5fd4fa0a19333bbd6d5aa9b86d1c4c522ce0e86b930efb7ee0","abstract_canon_sha256":"92845d0d5c0795258d8743898f71a123b7d749c77a104211a9115bcda155e0f0"},"schema_version":"1.0"},"canonical_sha256":"c92b37818abd8d58ae84afa7ca6b9f617392c4540c7531b74ed836e49aa71221","source":{"kind":"arxiv","id":"2104.09632","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2104.09632","created_at":"2026-07-05T02:33:35Z"},{"alias_kind":"arxiv_version","alias_value":"2104.09632v1","created_at":"2026-07-05T02:33:35Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2104.09632","created_at":"2026-07-05T02:33:35Z"},{"alias_kind":"pith_short_12","alias_value":"ZEVTPAMKXWGV","created_at":"2026-07-05T02:33:35Z"},{"alias_kind":"pith_short_16","alias_value":"ZEVTPAMKXWGVRLUE","created_at":"2026-07-05T02:33:35Z"},{"alias_kind":"pith_short_8","alias_value":"ZEVTPAMK","created_at":"2026-07-05T02:33:35Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2021:ZEVTPAMKXWGVRLUEV6T4U247MF","target":"record","payload":{"canonical_record":{"source":{"id":"2104.09632","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.IR","submitted_at":"2021-04-19T20:49:45Z","cross_cats_sorted":[],"title_canon_sha256":"4e95a159239d7e5fd4fa0a19333bbd6d5aa9b86d1c4c522ce0e86b930efb7ee0","abstract_canon_sha256":"92845d0d5c0795258d8743898f71a123b7d749c77a104211a9115bcda155e0f0"},"schema_version":"1.0"},"canonical_sha256":"c92b37818abd8d58ae84afa7ca6b9f617392c4540c7531b74ed836e49aa71221","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T02:33:35.503785Z","signature_b64":"bgoGSQ4FRmEMJSB36IyzDOPdY3FxgXmdXPpj34h0t+u3C9zSLP0u+rwhBOLpRuWej/7vtjp1Y6CTzVUH4MVTAA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"c92b37818abd8d58ae84afa7ca6b9f617392c4540c7531b74ed836e49aa71221","last_reissued_at":"2026-07-05T02:33:35.503306Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T02:33:35.503306Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2104.09632","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":"2026-07-05T02:33:35Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"2edN8/iqgTzbJ5enYUqWCknXJHea6C4cOxgTviIDUfmw3ygTtNVyWhHYY9oExRB7kJhP/kN5rTLIMK9oeAFBBg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-06T20:26:18.156490Z"},"content_sha256":"07161081b07b3d28e54acf8b9831a2c3d15b919388fd328353238c71c733aa77","schema_version":"1.0","event_id":"sha256:07161081b07b3d28e54acf8b9831a2c3d15b919388fd328353238c71c733aa77"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2021:ZEVTPAMKXWGVRLUEV6T4U247MF","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Searching for Scientific Evidence in a Pandemic: An Overview of TREC-COVID","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"cs.IR","authors_text":"Dina Demner-Fushman, Ellen Voorhees, Ian Soboroff, Kirk Roberts, Kyle Lo, Lucy Lu Wang, Steven Bedrick, Tasmeer Alam, William R Hersh","submitted_at":"2021-04-19T20:49:45Z","abstract_excerpt":"We present an overview of the TREC-COVID Challenge, an information retrieval (IR) shared task to evaluate search on scientific literature related to COVID-19. The goals of TREC-COVID include the construction of a pandemic search test collection and the evaluation of IR methods for COVID-19. The challenge was conducted over five rounds from April to July, 2020, with participation from 92 unique teams and 556 individual submissions. A total of 50 topics (sets of related queries) were used in the evaluation, starting at 30 topics for Round 1 and adding 5 new topics per round to target emerging to"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2104.09632","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/2104.09632/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":"2026-07-05T02:33:35Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"7X2G5aUylhXGn9wZsJXoCPpn3jedgp+ksQ6WnOspg0MxuUe92PDcgtg0dKVf7fGck00WrON205jnoZLL6hI6Dw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-06T20:26:18.156856Z"},"content_sha256":"7aae1b5c9119f1e9e495f30e3895b1d89ece995ba706d8775fc5ea7d4e387bc1","schema_version":"1.0","event_id":"sha256:7aae1b5c9119f1e9e495f30e3895b1d89ece995ba706d8775fc5ea7d4e387bc1"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/ZEVTPAMKXWGVRLUEV6T4U247MF/bundle.json","state_url":"https://pith.science/pith/ZEVTPAMKXWGVRLUEV6T4U247MF/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/ZEVTPAMKXWGVRLUEV6T4U247MF/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":"2026-07-06T20:26:18Z","links":{"resolver":"https://pith.science/pith/ZEVTPAMKXWGVRLUEV6T4U247MF","bundle":"https://pith.science/pith/ZEVTPAMKXWGVRLUEV6T4U247MF/bundle.json","state":"https://pith.science/pith/ZEVTPAMKXWGVRLUEV6T4U247MF/state.json","well_known_bundle":"https://pith.science/.well-known/pith/ZEVTPAMKXWGVRLUEV6T4U247MF/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2021:ZEVTPAMKXWGVRLUEV6T4U247MF","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":"92845d0d5c0795258d8743898f71a123b7d749c77a104211a9115bcda155e0f0","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.IR","submitted_at":"2021-04-19T20:49:45Z","title_canon_sha256":"4e95a159239d7e5fd4fa0a19333bbd6d5aa9b86d1c4c522ce0e86b930efb7ee0"},"schema_version":"1.0","source":{"id":"2104.09632","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2104.09632","created_at":"2026-07-05T02:33:35Z"},{"alias_kind":"arxiv_version","alias_value":"2104.09632v1","created_at":"2026-07-05T02:33:35Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2104.09632","created_at":"2026-07-05T02:33:35Z"},{"alias_kind":"pith_short_12","alias_value":"ZEVTPAMKXWGV","created_at":"2026-07-05T02:33:35Z"},{"alias_kind":"pith_short_16","alias_value":"ZEVTPAMKXWGVRLUE","created_at":"2026-07-05T02:33:35Z"},{"alias_kind":"pith_short_8","alias_value":"ZEVTPAMK","created_at":"2026-07-05T02:33:35Z"}],"graph_snapshots":[{"event_id":"sha256:7aae1b5c9119f1e9e495f30e3895b1d89ece995ba706d8775fc5ea7d4e387bc1","target":"graph","created_at":"2026-07-05T02:33:35Z","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/2104.09632/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"We present an overview of the TREC-COVID Challenge, an information retrieval (IR) shared task to evaluate search on scientific literature related to COVID-19. The goals of TREC-COVID include the construction of a pandemic search test collection and the evaluation of IR methods for COVID-19. The challenge was conducted over five rounds from April to July, 2020, with participation from 92 unique teams and 556 individual submissions. A total of 50 topics (sets of related queries) were used in the evaluation, starting at 30 topics for Round 1 and adding 5 new topics per round to target emerging to","authors_text":"Dina Demner-Fushman, Ellen Voorhees, Ian Soboroff, Kirk Roberts, Kyle Lo, Lucy Lu Wang, Steven Bedrick, Tasmeer Alam, William R Hersh","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.IR","submitted_at":"2021-04-19T20:49:45Z","title":"Searching for Scientific Evidence in a Pandemic: An Overview of TREC-COVID"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2104.09632","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":"sha256:07161081b07b3d28e54acf8b9831a2c3d15b919388fd328353238c71c733aa77","target":"record","created_at":"2026-07-05T02:33:35Z","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":"92845d0d5c0795258d8743898f71a123b7d749c77a104211a9115bcda155e0f0","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.IR","submitted_at":"2021-04-19T20:49:45Z","title_canon_sha256":"4e95a159239d7e5fd4fa0a19333bbd6d5aa9b86d1c4c522ce0e86b930efb7ee0"},"schema_version":"1.0","source":{"id":"2104.09632","kind":"arxiv","version":1}},"canonical_sha256":"c92b37818abd8d58ae84afa7ca6b9f617392c4540c7531b74ed836e49aa71221","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"c92b37818abd8d58ae84afa7ca6b9f617392c4540c7531b74ed836e49aa71221","first_computed_at":"2026-07-05T02:33:35.503306Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T02:33:35.503306Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"bgoGSQ4FRmEMJSB36IyzDOPdY3FxgXmdXPpj34h0t+u3C9zSLP0u+rwhBOLpRuWej/7vtjp1Y6CTzVUH4MVTAA==","signature_status":"signed_v1","signed_at":"2026-07-05T02:33:35.503785Z","signed_message":"canonical_sha256_bytes"},"source_id":"2104.09632","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:07161081b07b3d28e54acf8b9831a2c3d15b919388fd328353238c71c733aa77","sha256:7aae1b5c9119f1e9e495f30e3895b1d89ece995ba706d8775fc5ea7d4e387bc1"],"state_sha256":"0cabadd3a888f9c830f10d47d592e9f852eca8922722c622f56236f998f0c880"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"EMK82Vl009nqFjHaViy09kaF54TPYcUcXnKdEdG3CNgZ7c/cxUab1tOB7B62bozFSKehZ98SiXa8rLytU4HfAg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-07-06T20:26:18.159208Z","bundle_sha256":"dde2bb485c7bad64b1247764dcdb33dcc46ce8780660ae54590753dbaa904632"}}