{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2002:RALGOAYPHKGSSDKLFKX4VXRAJT","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":"010b5bf2ad6539816aa7e4b8eb1af474afb17ec9f22998220082e097e45a4d26","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.hist-ph","submitted_at":"2002-06-20T19:16:58Z","title_canon_sha256":"01f1b15dee8aa993a9e9a011d4a6acf8da7862bdbffee958b9c4862ed19a4edd"},"schema_version":"1.0","source":{"id":"physics/0206076","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"physics/0206076","created_at":"2026-05-18T04:10:34Z"},{"alias_kind":"arxiv_version","alias_value":"physics/0206076v2","created_at":"2026-05-18T04:10:34Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.physics/0206076","created_at":"2026-05-18T04:10:34Z"},{"alias_kind":"pith_short_12","alias_value":"RALGOAYPHKGS","created_at":"2026-05-18T12:25:51Z"},{"alias_kind":"pith_short_16","alias_value":"RALGOAYPHKGSSDKL","created_at":"2026-05-18T12:25:51Z"},{"alias_kind":"pith_short_8","alias_value":"RALGOAYP","created_at":"2026-05-18T12:25:51Z"}],"graph_snapshots":[{"event_id":"sha256:f4b3332da3fbe60f7099322fc416a512a1236c8f9783de00af7244efcb1f4dac","target":"graph","created_at":"2026-05-18T04:10:34Z","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":"Since 1945 Canada has had a nuclear power industry based on reactor design which uses natural uranium and heavy water. The tortuous and improbable sequence of events which led to this situation is examined.","authors_text":"Chris Waltham","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.hist-ph","submitted_at":"2002-06-20T19:16:58Z","title":"An Early History of Heavy Water"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"physics/0206076","kind":"arxiv","version":2},"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":"sha256:84fb5efd6ccba9f740d62b801c3d0197c5be023b1234c4d5a044896a6f03aaa3","target":"record","created_at":"2026-05-18T04:10:34Z","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":"010b5bf2ad6539816aa7e4b8eb1af474afb17ec9f22998220082e097e45a4d26","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.hist-ph","submitted_at":"2002-06-20T19:16:58Z","title_canon_sha256":"01f1b15dee8aa993a9e9a011d4a6acf8da7862bdbffee958b9c4862ed19a4edd"},"schema_version":"1.0","source":{"id":"physics/0206076","kind":"arxiv","version":2}},"canonical_sha256":"881667030f3a8d290d4b2aafcade204cd03661a5f6b751eb8a633ee2d4b3c1a7","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"881667030f3a8d290d4b2aafcade204cd03661a5f6b751eb8a633ee2d4b3c1a7","first_computed_at":"2026-05-18T04:10:34.771360Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T04:10:34.771360Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"wId/QfrsJM/kGSiQr0Qg0VzIAOcS1aFqNfewGri0sE64JbmpzduRWGCvly9gpEkMl436uu0efGrz+1mZ/H9nAw==","signature_status":"signed_v1","signed_at":"2026-05-18T04:10:34.772158Z","signed_message":"canonical_sha256_bytes"},"source_id":"physics/0206076","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:84fb5efd6ccba9f740d62b801c3d0197c5be023b1234c4d5a044896a6f03aaa3","sha256:f4b3332da3fbe60f7099322fc416a512a1236c8f9783de00af7244efcb1f4dac"],"state_sha256":"1e88d718f61492dfb7c192ea8bbc8d1ec123477c0f438d5cb4a326ba8b7d1e62"}