{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2003:4YQD5GUATKGYOZXAHYV2E6F5KN","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":"4f90555a8d76e2c713ff3ff2dda463c6075a42823d104578580b9ab1a5df5c2d","cross_cats_sorted":[],"license":"","primary_cat":"astro-ph","submitted_at":"2003-10-28T19:08:04Z","title_canon_sha256":"45b2856a48681271e22c8daf3eddc00ee3db2605086427a226bff8c78dcfbe52"},"schema_version":"1.0","source":{"id":"astro-ph/0310804","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"astro-ph/0310804","created_at":"2026-07-04T16:37:37Z"},{"alias_kind":"arxiv_version","alias_value":"astro-ph/0310804v1","created_at":"2026-07-04T16:37:37Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.astro-ph/0310804","created_at":"2026-07-04T16:37:37Z"},{"alias_kind":"pith_short_12","alias_value":"4YQD5GUATKGY","created_at":"2026-07-04T16:37:37Z"},{"alias_kind":"pith_short_16","alias_value":"4YQD5GUATKGYOZXA","created_at":"2026-07-04T16:37:37Z"},{"alias_kind":"pith_short_8","alias_value":"4YQD5GUA","created_at":"2026-07-04T16:37:37Z"}],"graph_snapshots":[{"event_id":"sha256:d44fdb84b37b635bef0e0c5f2d64c217640ca06614cf5b20f51ff0080bd5a374","target":"graph","created_at":"2026-07-04T16:37:37Z","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/astro-ph/0310804/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"Deep X-ray surveys have shown that the cosmic X-ray background (XRB) is largely due to the accretion onto supermassive black holes, integrated over the cosmic time. These surveys have resolved more than 80% of the 0.1-10 keV X-ray background into discrete sources. Optical spectroscopic identifications show that the sources producing the bulk of the X-ray background are a mixture of unobscured (type-1) and obscured (type-2) AGNs, as predicted by the XRB population synthesis models. A class of highly luminous type-2 AGN, so called QSO-2s, has been detected in the deepest Chandra and XMM-Newton s","authors_text":"G. Hasinger","cross_cats":[],"headline":"","license":"","primary_cat":"astro-ph","submitted_at":"2003-10-28T19:08:04Z","title":"The X-ray Background and AGNs"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"astro-ph/0310804","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":"sha256:9dae0f70e0af6184a2302c6f99bcca09bd03faa6338622b6d3321d6e9ea5eb62","target":"record","created_at":"2026-07-04T16:37:37Z","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":"4f90555a8d76e2c713ff3ff2dda463c6075a42823d104578580b9ab1a5df5c2d","cross_cats_sorted":[],"license":"","primary_cat":"astro-ph","submitted_at":"2003-10-28T19:08:04Z","title_canon_sha256":"45b2856a48681271e22c8daf3eddc00ee3db2605086427a226bff8c78dcfbe52"},"schema_version":"1.0","source":{"id":"astro-ph/0310804","kind":"arxiv","version":1}},"canonical_sha256":"e6203e9a809a8d8766e03e2ba278bd534854445bf23d3c2b2a230e97f661a31e","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"e6203e9a809a8d8766e03e2ba278bd534854445bf23d3c2b2a230e97f661a31e","first_computed_at":"2026-07-04T16:37:37.840525Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-04T16:37:37.840525Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"CXPC3arIbLT+r9NgmttGZCB/5JiA9zyKLtC+DY7jU1C1PRpForcxbSuXo11T4tg3K7xeply78AHrhSeU+UcbAw==","signature_status":"signed_v1","signed_at":"2026-07-04T16:37:37.840982Z","signed_message":"canonical_sha256_bytes"},"source_id":"astro-ph/0310804","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:9dae0f70e0af6184a2302c6f99bcca09bd03faa6338622b6d3321d6e9ea5eb62","sha256:d44fdb84b37b635bef0e0c5f2d64c217640ca06614cf5b20f51ff0080bd5a374"],"state_sha256":"14b0939dbd63a2d2ed62d414e6fd44adaab8b94deefa26783751b4ce06d14dfc"}