{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2010:MP66GTUPFCVOXG5GQOT5VDITTY","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":"d3f35de269056a512c03029eafa7a93d11142f6f8e9a9415a1522630da09f23f","cross_cats_sorted":[],"license":"http://creativecommons.org/licenses/publicdomain/","primary_cat":"astro-ph.IM","submitted_at":"2010-03-09T22:03:15Z","title_canon_sha256":"c4fc4e0399af1cb4c843d000ff9ef07982990feff5e9fcd0ed4610df2048e5d9"},"schema_version":"1.0","source":{"id":"1003.1990","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1003.1990","created_at":"2026-05-18T02:08:35Z"},{"alias_kind":"arxiv_version","alias_value":"1003.1990v1","created_at":"2026-05-18T02:08:35Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1003.1990","created_at":"2026-05-18T02:08:35Z"},{"alias_kind":"pith_short_12","alias_value":"MP66GTUPFCVO","created_at":"2026-05-18T12:26:10Z"},{"alias_kind":"pith_short_16","alias_value":"MP66GTUPFCVOXG5G","created_at":"2026-05-18T12:26:10Z"},{"alias_kind":"pith_short_8","alias_value":"MP66GTUP","created_at":"2026-05-18T12:26:10Z"}],"graph_snapshots":[{"event_id":"sha256:fae05870a0a3e6087f01504ba1637847815c1a71d92e5214e9d7ebadf6a82bd8","target":"graph","created_at":"2026-05-18T02:08:35Z","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"},"paper":{"abstract_excerpt":"We review the history of the development of the Chandra X-ray Observatory from our personal perspective. This review is necessarily biased and limited by space since it attempts to cover a time span approaching 5 decades.","authors_text":"Martin C. Weisskopf","cross_cats":[],"headline":"","license":"http://creativecommons.org/licenses/publicdomain/","primary_cat":"astro-ph.IM","submitted_at":"2010-03-09T22:03:15Z","title":"The Making of the Chandra X-ray Observatory: the Project Scientist's Perspective"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1003.1990","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:dca47b63ec84f9fa802eb1b9d4485045162873fc771093c5395cf85480d09a8e","target":"record","created_at":"2026-05-18T02:08:35Z","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":"d3f35de269056a512c03029eafa7a93d11142f6f8e9a9415a1522630da09f23f","cross_cats_sorted":[],"license":"http://creativecommons.org/licenses/publicdomain/","primary_cat":"astro-ph.IM","submitted_at":"2010-03-09T22:03:15Z","title_canon_sha256":"c4fc4e0399af1cb4c843d000ff9ef07982990feff5e9fcd0ed4610df2048e5d9"},"schema_version":"1.0","source":{"id":"1003.1990","kind":"arxiv","version":1}},"canonical_sha256":"63fde34e8f28aaeb9ba683a7da8d139e0d518a891da64a6b8f7e93b2a8b18f69","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"63fde34e8f28aaeb9ba683a7da8d139e0d518a891da64a6b8f7e93b2a8b18f69","first_computed_at":"2026-05-18T02:08:35.731357Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T02:08:35.731357Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"NVC5zcrKxN5llOOe6/koPHaGvs4YJ/rrwUoECVB4DNwn8NGGwgfHpHM1aIyLSMDmyL1QAkxLijKkYd3No4u7Bw==","signature_status":"signed_v1","signed_at":"2026-05-18T02:08:35.731940Z","signed_message":"canonical_sha256_bytes"},"source_id":"1003.1990","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:dca47b63ec84f9fa802eb1b9d4485045162873fc771093c5395cf85480d09a8e","sha256:fae05870a0a3e6087f01504ba1637847815c1a71d92e5214e9d7ebadf6a82bd8"],"state_sha256":"ce9da279c7d369243d1f3a6d5080cea619fdea405c56df3844abf522de8b6095"}