{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2023:WLL4UG5IWIWK7R33S3J6NYBKUK","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":"56b83ed884fbfbb82c11fb85eff4cedb23200e7da57d14936af00158c31ec415","cross_cats_sorted":[],"license":"http://creativecommons.org/licenses/by-nc-sa/4.0/","primary_cat":"astro-ph.CO","submitted_at":"2023-08-17T08:22:15Z","title_canon_sha256":"4bae2e87eccc9aa03a9a4b3422ed092dddfb3fce98c65b1292789cbeaf2becf5"},"schema_version":"1.0","source":{"id":"2308.08851","kind":"arxiv","version":4}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2308.08851","created_at":"2026-07-05T10:45:04Z"},{"alias_kind":"arxiv_version","alias_value":"2308.08851v4","created_at":"2026-07-05T10:45:04Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2308.08851","created_at":"2026-07-05T10:45:04Z"},{"alias_kind":"pith_short_12","alias_value":"WLL4UG5IWIWK","created_at":"2026-07-05T10:45:04Z"},{"alias_kind":"pith_short_16","alias_value":"WLL4UG5IWIWK7R33","created_at":"2026-07-05T10:45:04Z"},{"alias_kind":"pith_short_8","alias_value":"WLL4UG5I","created_at":"2026-07-05T10:45:04Z"}],"graph_snapshots":[{"event_id":"sha256:607670f12364699d84272eccc7b4635a233242bab27a5160ddaf984f417c828a","target":"graph","created_at":"2026-07-05T10:45:04Z","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/2308.08851/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"This study presents results on detecting neutral atomic hydrogen (HI) 21cm absorption in the spectrum of PKS1413+135 at redshift $z=0.24670041$. The observation was conducted by FAST, with a spectral resolution of 10 Hz, using 10 minutes of observing time. The global spectral profile is examined by modeling the absorption line using a single Gaussian function with a resolution of 10 kHz within a 2 MHz bandwidth. The goal is to determine the rate of the latest cosmic acceleration by directly measuring redshift evolution of H I 21 cm absorption line with Hubble flow towards a same background Qua","authors_text":"Chang-Zhi Lu, Jiangang Kang, Ming Zhu, Tongjie Zhang","cross_cats":[],"headline":"","license":"http://creativecommons.org/licenses/by-nc-sa/4.0/","primary_cat":"astro-ph.CO","submitted_at":"2023-08-17T08:22:15Z","title":"Toward a direct measurement of the cosmic acceleration: The pilot observation of H I 21cm absorption line at FAST"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2308.08851","kind":"arxiv","version":4},"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":"sha256:9c627f2a3898bf5bc258325cc89f314fe27e59127658ea2f28fbf312368d9b44","target":"record","created_at":"2026-07-05T10:45:04Z","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":"56b83ed884fbfbb82c11fb85eff4cedb23200e7da57d14936af00158c31ec415","cross_cats_sorted":[],"license":"http://creativecommons.org/licenses/by-nc-sa/4.0/","primary_cat":"astro-ph.CO","submitted_at":"2023-08-17T08:22:15Z","title_canon_sha256":"4bae2e87eccc9aa03a9a4b3422ed092dddfb3fce98c65b1292789cbeaf2becf5"},"schema_version":"1.0","source":{"id":"2308.08851","kind":"arxiv","version":4}},"canonical_sha256":"b2d7ca1ba8b22cafc77b96d3e6e02aa2a361947b3ce83ed1214b0cbc77a15a6a","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"b2d7ca1ba8b22cafc77b96d3e6e02aa2a361947b3ce83ed1214b0cbc77a15a6a","first_computed_at":"2026-07-05T10:45:04.067469Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T10:45:04.067469Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"hc3G3vAH0eMh1PdLqwsZB7ZZNkF7Z095Jiq9eqIRS1ipbAJbqLostbul0kj0JhP+DN/osgOCXA3LKNpKmQHwDQ==","signature_status":"signed_v1","signed_at":"2026-07-05T10:45:04.068006Z","signed_message":"canonical_sha256_bytes"},"source_id":"2308.08851","source_kind":"arxiv","source_version":4}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:9c627f2a3898bf5bc258325cc89f314fe27e59127658ea2f28fbf312368d9b44","sha256:607670f12364699d84272eccc7b4635a233242bab27a5160ddaf984f417c828a"],"state_sha256":"2b62d35153884caf8a08420b9ae8408f30f9cbbff2d294de45a2a4324d152987"}