{"record_type":"pith_number_record","schema_url":"https://pith.science/schemas/pith-number/v1.json","pith_number":"pith:2019:F4DD4BZGTRTGA42FB5AZJGNPAM","short_pith_number":"pith:F4DD4BZG","schema_version":"1.0","canonical_sha256":"2f063e07269c666073450f419499af03075c888365d37a95b5b4038bd5bfa164","source":{"kind":"arxiv","id":"1908.00406","version":1},"attestation_state":"computed","paper":{"title":"Cycle class maps and birational invariants","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"math.AG","authors_text":"Brendan Hassett, Yuri Tschinkel","submitted_at":"2019-08-01T14:00:24Z","abstract_excerpt":"We introduce new obstructions to rationality for geometrically rational threefolds arising from the geometry of curves and their cycle maps."},"verification_status":{"content_addressed":true,"pith_receipt":true,"author_attested":false,"weak_author_claims":0,"strong_author_claims":0,"externally_anchored":false,"storage_verified":false,"citation_signatures":0,"replication_records":0,"graph_snapshot":true,"references_resolved":false,"formal_links_present":false},"canonical_record":{"source":{"id":"1908.00406","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"math.AG","submitted_at":"2019-08-01T14:00:24Z","cross_cats_sorted":[],"title_canon_sha256":"6a0c4191fc4876157509f664d5b6bbc3b5d570bee402352a34f25ecf283be0cb","abstract_canon_sha256":"28fbdb713e15b25ff8280feb10b9d9bbfb3ddb1586c39e4ff462339c86a66157"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-04T23:51:00.111700Z","signature_b64":"yCQs717kIM3fkm+v2bO0IKFanv/wZE9aIooXIBtpqJAMufGubZ/CaCd10gC/9I++DNfotcMlTRIqzahYMdnmAA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"2f063e07269c666073450f419499af03075c888365d37a95b5b4038bd5bfa164","last_reissued_at":"2026-07-04T23:51:00.111328Z","signature_status":"signed_v1","first_computed_at":"2026-07-04T23:51:00.111328Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"Cycle class maps and birational invariants","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"math.AG","authors_text":"Brendan Hassett, Yuri Tschinkel","submitted_at":"2019-08-01T14:00:24Z","abstract_excerpt":"We introduce new obstructions to rationality for geometrically rational threefolds arising from the geometry of curves and their cycle maps."},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1908.00406","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/1908.00406/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"},"aliases":[{"alias_kind":"arxiv","alias_value":"1908.00406","created_at":"2026-07-04T23:51:00.111396+00:00"},{"alias_kind":"arxiv_version","alias_value":"1908.00406v1","created_at":"2026-07-04T23:51:00.111396+00:00"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1908.00406","created_at":"2026-07-04T23:51:00.111396+00:00"},{"alias_kind":"pith_short_12","alias_value":"F4DD4BZGTRTG","created_at":"2026-07-04T23:51:00.111396+00:00"},{"alias_kind":"pith_short_16","alias_value":"F4DD4BZGTRTGA42F","created_at":"2026-07-04T23:51:00.111396+00:00"},{"alias_kind":"pith_short_8","alias_value":"F4DD4BZG","created_at":"2026-07-04T23:51:00.111396+00:00"}],"events":[],"event_summary":{},"paper_claims":[],"inbound_citations":{"count":0,"internal_anchor_count":0,"sample":[]},"formal_canon":{"evidence_count":0,"sample":[],"anchors":[]},"links":{"html":"https://pith.science/pith/F4DD4BZGTRTGA42FB5AZJGNPAM","json":"https://pith.science/pith/F4DD4BZGTRTGA42FB5AZJGNPAM.json","graph_json":"https://pith.science/api/pith-number/F4DD4BZGTRTGA42FB5AZJGNPAM/graph.json","events_json":"https://pith.science/api/pith-number/F4DD4BZGTRTGA42FB5AZJGNPAM/events.json","paper":"https://pith.science/paper/F4DD4BZG"},"agent_actions":{"view_html":"https://pith.science/pith/F4DD4BZGTRTGA42FB5AZJGNPAM","download_json":"https://pith.science/pith/F4DD4BZGTRTGA42FB5AZJGNPAM.json","view_paper":"https://pith.science/paper/F4DD4BZG","resolve_alias":"https://pith.science/api/pith-number/resolve?arxiv=1908.00406&json=true","fetch_graph":"https://pith.science/api/pith-number/F4DD4BZGTRTGA42FB5AZJGNPAM/graph.json","fetch_events":"https://pith.science/api/pith-number/F4DD4BZGTRTGA42FB5AZJGNPAM/events.json","actions":{"anchor_timestamp":"https://pith.science/pith/F4DD4BZGTRTGA42FB5AZJGNPAM/action/timestamp_anchor","attest_storage":"https://pith.science/pith/F4DD4BZGTRTGA42FB5AZJGNPAM/action/storage_attestation","attest_author":"https://pith.science/pith/F4DD4BZGTRTGA42FB5AZJGNPAM/action/author_attestation","sign_citation":"https://pith.science/pith/F4DD4BZGTRTGA42FB5AZJGNPAM/action/citation_signature","submit_replication":"https://pith.science/pith/F4DD4BZGTRTGA42FB5AZJGNPAM/action/replication_record"}},"created_at":"2026-07-04T23:51:00.111396+00:00","updated_at":"2026-07-04T23:51:00.111396+00:00"}