{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2013:MNO6INTB7SFGJORGXJK2RSRPI3","short_pith_number":"pith:MNO6INTB","canonical_record":{"source":{"id":"1311.1635","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2013-11-07T10:48:39Z","cross_cats_sorted":[],"title_canon_sha256":"33d287f758a4863fba49739b54a738b0769dd63f4359cf9ef14d76ea71944aa7","abstract_canon_sha256":"9407e4375ca65380eb0a638529ad47f333814574f6b98a76721b24aac3e163d6"},"schema_version":"1.0"},"canonical_sha256":"635de43661fc8a64ba26ba55a8ca2f46f81a1eabd4faab2331dbf6ce5fd4dc8e","source":{"kind":"arxiv","id":"1311.1635","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1311.1635","created_at":"2026-05-18T01:46:33Z"},{"alias_kind":"arxiv_version","alias_value":"1311.1635v1","created_at":"2026-05-18T01:46:33Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1311.1635","created_at":"2026-05-18T01:46:33Z"},{"alias_kind":"pith_short_12","alias_value":"MNO6INTB7SFG","created_at":"2026-05-18T12:27:52Z"},{"alias_kind":"pith_short_16","alias_value":"MNO6INTB7SFGJORG","created_at":"2026-05-18T12:27:52Z"},{"alias_kind":"pith_short_8","alias_value":"MNO6INTB","created_at":"2026-05-18T12:27:52Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2013:MNO6INTB7SFGJORGXJK2RSRPI3","target":"record","payload":{"canonical_record":{"source":{"id":"1311.1635","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2013-11-07T10:48:39Z","cross_cats_sorted":[],"title_canon_sha256":"33d287f758a4863fba49739b54a738b0769dd63f4359cf9ef14d76ea71944aa7","abstract_canon_sha256":"9407e4375ca65380eb0a638529ad47f333814574f6b98a76721b24aac3e163d6"},"schema_version":"1.0"},"canonical_sha256":"635de43661fc8a64ba26ba55a8ca2f46f81a1eabd4faab2331dbf6ce5fd4dc8e","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:46:33.328207Z","signature_b64":"HZ/rOxSHmzJIC4VLznVDFGv4YYjrXyNt6amQpNWs1zX4/+pk7bUWhdHGJW3VLB9AjIrtExj/yjlG2F589sjkDQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"635de43661fc8a64ba26ba55a8ca2f46f81a1eabd4faab2331dbf6ce5fd4dc8e","last_reissued_at":"2026-05-18T01:46:33.327690Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:46:33.327690Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1311.1635","source_version":1,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T01:46:33Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"RoWRV/BZCPmUcj8ayxM5GCvrfmamfAFy8IkHpq5U9tsXYF2vphqVziNpPHe7Bmqmc+fxkDEAUN0/qDnEVNY7CQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-26T09:38:58.490383Z"},"content_sha256":"371249d799173de1694ce03a4112b80efe0a691451c0cabddda5c3571d394a03","schema_version":"1.0","event_id":"sha256:371249d799173de1694ce03a4112b80efe0a691451c0cabddda5c3571d394a03"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2013:MNO6INTB7SFGJORGXJK2RSRPI3","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"The Origin and Pulsations of Extreme Helium Stars","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.SR","authors_text":"C. Simon Jeffery","submitted_at":"2013-11-07T10:48:39Z","abstract_excerpt":"Stars consume hydrogen in their interiors but, generally speaking, their surfaces continue to contain some 70% hydrogen (by mass) throughout their lives. Nevertheless, many types of star can be found with hydrogen-deficient surfaces, in some cases with as little as one hydrogen atom in 10 000. Amongst these, the luminous B- and A-type extreme helium stars are genuinely rare; only ~15 are known within a very substantial volume of the Galaxy.\n  Evidence from surface composition suggests a connection to the cooler R CrB variables and some of the hotter helium-rich subdwarf O stars. Arguments curr"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1311.1635","kind":"arxiv","version":1},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"references":{"count":0,"sample":[],"resolved_work":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","internal_anchors":0},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"author_claims":{"count":0,"strong_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"builder_version":"pith-number-builder-2026-05-17-v1"},"verdict_id":null},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T01:46:33Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"3dNwQrCwGTjlPORVwS1Ahm0c+eByWKveuAGBBzCycvYcq9ezt1lmR5F+pAooDmSlEiOc0HT1MgcnXAmGG/jnAA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-26T09:38:58.491018Z"},"content_sha256":"d700c2e346acf3eac8e36325e20eacd87f476b448700cc52f11aba57ba550ba0","schema_version":"1.0","event_id":"sha256:d700c2e346acf3eac8e36325e20eacd87f476b448700cc52f11aba57ba550ba0"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/MNO6INTB7SFGJORGXJK2RSRPI3/bundle.json","state_url":"https://pith.science/pith/MNO6INTB7SFGJORGXJK2RSRPI3/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/MNO6INTB7SFGJORGXJK2RSRPI3/bundle.json","status":"primary"}],"public_keys":[{"key_id":"pith-v1-2026-05","algorithm":"ed25519","format":"raw","public_key_b64":"stVStoiQhXFxp4s2pdzPNoqVNBMojDU/fJ2db5S3CbM=","public_key_hex":"b2d552b68890857171a78b36a5dccf368a953413288c353f7c9d9d6f94b709b3","fingerprint_sha256_b32_first128bits":"RVFV5Z2OI2J3ZUO7ERDEBCYNKS","fingerprint_sha256_hex":"8d4b5ee74e4693bcd1df2446408b0d54","rotates_at":null,"url":"https://pith.science/pith-signing-key.json","notes":"Pith uses this Ed25519 key to sign canonical record SHA-256 digests. Verify with: ed25519_verify(public_key, message=canonical_sha256_bytes, signature=base64decode(signature_b64))."}],"merge_version":"pith-open-graph-merge-v1","built_at":"2026-05-26T09:38:58Z","links":{"resolver":"https://pith.science/pith/MNO6INTB7SFGJORGXJK2RSRPI3","bundle":"https://pith.science/pith/MNO6INTB7SFGJORGXJK2RSRPI3/bundle.json","state":"https://pith.science/pith/MNO6INTB7SFGJORGXJK2RSRPI3/state.json","well_known_bundle":"https://pith.science/.well-known/pith/MNO6INTB7SFGJORGXJK2RSRPI3/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2013:MNO6INTB7SFGJORGXJK2RSRPI3","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":"9407e4375ca65380eb0a638529ad47f333814574f6b98a76721b24aac3e163d6","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2013-11-07T10:48:39Z","title_canon_sha256":"33d287f758a4863fba49739b54a738b0769dd63f4359cf9ef14d76ea71944aa7"},"schema_version":"1.0","source":{"id":"1311.1635","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1311.1635","created_at":"2026-05-18T01:46:33Z"},{"alias_kind":"arxiv_version","alias_value":"1311.1635v1","created_at":"2026-05-18T01:46:33Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1311.1635","created_at":"2026-05-18T01:46:33Z"},{"alias_kind":"pith_short_12","alias_value":"MNO6INTB7SFG","created_at":"2026-05-18T12:27:52Z"},{"alias_kind":"pith_short_16","alias_value":"MNO6INTB7SFGJORG","created_at":"2026-05-18T12:27:52Z"},{"alias_kind":"pith_short_8","alias_value":"MNO6INTB","created_at":"2026-05-18T12:27:52Z"}],"graph_snapshots":[{"event_id":"sha256:d700c2e346acf3eac8e36325e20eacd87f476b448700cc52f11aba57ba550ba0","target":"graph","created_at":"2026-05-18T01:46:33Z","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":"Stars consume hydrogen in their interiors but, generally speaking, their surfaces continue to contain some 70% hydrogen (by mass) throughout their lives. Nevertheless, many types of star can be found with hydrogen-deficient surfaces, in some cases with as little as one hydrogen atom in 10 000. Amongst these, the luminous B- and A-type extreme helium stars are genuinely rare; only ~15 are known within a very substantial volume of the Galaxy.\n  Evidence from surface composition suggests a connection to the cooler R CrB variables and some of the hotter helium-rich subdwarf O stars. Arguments curr","authors_text":"C. Simon Jeffery","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2013-11-07T10:48:39Z","title":"The Origin and Pulsations of Extreme Helium Stars"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1311.1635","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":"sha256:371249d799173de1694ce03a4112b80efe0a691451c0cabddda5c3571d394a03","target":"record","created_at":"2026-05-18T01:46:33Z","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":"9407e4375ca65380eb0a638529ad47f333814574f6b98a76721b24aac3e163d6","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2013-11-07T10:48:39Z","title_canon_sha256":"33d287f758a4863fba49739b54a738b0769dd63f4359cf9ef14d76ea71944aa7"},"schema_version":"1.0","source":{"id":"1311.1635","kind":"arxiv","version":1}},"canonical_sha256":"635de43661fc8a64ba26ba55a8ca2f46f81a1eabd4faab2331dbf6ce5fd4dc8e","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"635de43661fc8a64ba26ba55a8ca2f46f81a1eabd4faab2331dbf6ce5fd4dc8e","first_computed_at":"2026-05-18T01:46:33.327690Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:46:33.327690Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"HZ/rOxSHmzJIC4VLznVDFGv4YYjrXyNt6amQpNWs1zX4/+pk7bUWhdHGJW3VLB9AjIrtExj/yjlG2F589sjkDQ==","signature_status":"signed_v1","signed_at":"2026-05-18T01:46:33.328207Z","signed_message":"canonical_sha256_bytes"},"source_id":"1311.1635","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:371249d799173de1694ce03a4112b80efe0a691451c0cabddda5c3571d394a03","sha256:d700c2e346acf3eac8e36325e20eacd87f476b448700cc52f11aba57ba550ba0"],"state_sha256":"2e5905434af3e0366f8dbb828293539462bd9eaba2360d4cfed4be1c4033cfdd"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"8X+IVoTblKOa1O3U5llFjUj7sIdsX8q5R+m5OoixuJIlR/tJVES1BuCG28BHq2lcvDLVd6sBqvOQ66M3CDibAw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-26T09:38:58.494890Z","bundle_sha256":"d3966cc2ad61fad9118aab852e39d3ef054505dc9982c44797037d08c3da5a9c"}}