{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2002:BZUMW2W2IFWCKVGF2MGXGW7PHS","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":"65671dd5b76b6b447ee324a5a159998c69eb4a07317d6c04ab805240b3ed1503","cross_cats_sorted":[],"license":"","primary_cat":"astro-ph","submitted_at":"2002-07-12T10:05:34Z","title_canon_sha256":"7f190c66a91572f298904cb98e910b009d6d2c7d8ee44d697b1ebb9de7ee0914"},"schema_version":"1.0","source":{"id":"astro-ph/0207270","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"astro-ph/0207270","created_at":"2026-07-04T16:30:21Z"},{"alias_kind":"arxiv_version","alias_value":"astro-ph/0207270v1","created_at":"2026-07-04T16:30:21Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.astro-ph/0207270","created_at":"2026-07-04T16:30:21Z"},{"alias_kind":"pith_short_12","alias_value":"BZUMW2W2IFWC","created_at":"2026-07-04T16:30:21Z"},{"alias_kind":"pith_short_16","alias_value":"BZUMW2W2IFWCKVGF","created_at":"2026-07-04T16:30:21Z"},{"alias_kind":"pith_short_8","alias_value":"BZUMW2W2","created_at":"2026-07-04T16:30:21Z"}],"graph_snapshots":[{"event_id":"sha256:1cde7ea00b414ca91d56d1c069d6910f9bab3be240feaecaa9c241394f778308","target":"graph","created_at":"2026-07-04T16:30:21Z","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/0207270/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"Recently, several ways of obtaining observational proof of the existence of black-hole horizons have been proposed. We argue here that such proof is fundamentally impossible: observations can provide arguments, sometimes very strong ones, in favour of the existence of the event horizon, but they cannot prove it. This applies also to future observations, which will trace very accurately the details of the spacetime metric of a body suspected of being a black hole.","authors_text":"Jean-Pierre Lasota, Marek A. Abramowicz, Wlodek Kluzniak","cross_cats":[],"headline":"","license":"","primary_cat":"astro-ph","submitted_at":"2002-07-12T10:05:34Z","title":"No observational proof of the black-hole event-horizon"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"astro-ph/0207270","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:a509003ee903a265305235accb0a58dd76b160e6219a0ea27b983a12f7ef650e","target":"record","created_at":"2026-07-04T16:30:21Z","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":"65671dd5b76b6b447ee324a5a159998c69eb4a07317d6c04ab805240b3ed1503","cross_cats_sorted":[],"license":"","primary_cat":"astro-ph","submitted_at":"2002-07-12T10:05:34Z","title_canon_sha256":"7f190c66a91572f298904cb98e910b009d6d2c7d8ee44d697b1ebb9de7ee0914"},"schema_version":"1.0","source":{"id":"astro-ph/0207270","kind":"arxiv","version":1}},"canonical_sha256":"0e68cb6ada416c2554c5d30d735bef3c9c240d16d8f4e1c1dba036d70598eebf","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"0e68cb6ada416c2554c5d30d735bef3c9c240d16d8f4e1c1dba036d70598eebf","first_computed_at":"2026-07-04T16:30:21.999198Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-04T16:30:21.999198Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"/40jRMkK/+iU1lcLmhGvj2jpPDbBBXh0zse26fEZaWfrqjTqeu6f/ITYQoesNoxjvnFUIGxxV8sNZbWorBT/Cg==","signature_status":"signed_v1","signed_at":"2026-07-04T16:30:21.999545Z","signed_message":"canonical_sha256_bytes"},"source_id":"astro-ph/0207270","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:a509003ee903a265305235accb0a58dd76b160e6219a0ea27b983a12f7ef650e","sha256:1cde7ea00b414ca91d56d1c069d6910f9bab3be240feaecaa9c241394f778308"],"state_sha256":"4a12bba225dca03b048842e13976f361a720782c1074c25ae9522df069bbaaf1"}