{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2023:TTU6X4UM46RFJBPMMO4FL2XZCW","short_pith_number":"pith:TTU6X4UM","canonical_record":{"source":{"id":"2305.00305","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2023-04-29T17:21:44Z","cross_cats_sorted":["astro-ph.GA","astro-ph.IM"],"title_canon_sha256":"c901d6c97906b5c58248663f0b5e62871661d86ff5c614cf6c453cf5edfec2ae","abstract_canon_sha256":"fd9c49e4fc3507920a42a5fade7aeb9b28f25f86b1636e30afea20978e6a5238"},"schema_version":"1.0"},"canonical_sha256":"9ce9ebf28ce7a25485ec63b855eaf915b5b26b08d719a2571f9babe74d328c5a","source":{"kind":"arxiv","id":"2305.00305","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2305.00305","created_at":"2026-07-05T06:25:28Z"},{"alias_kind":"arxiv_version","alias_value":"2305.00305v2","created_at":"2026-07-05T06:25:28Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2305.00305","created_at":"2026-07-05T06:25:28Z"},{"alias_kind":"pith_short_12","alias_value":"TTU6X4UM46RF","created_at":"2026-07-05T06:25:28Z"},{"alias_kind":"pith_short_16","alias_value":"TTU6X4UM46RFJBPM","created_at":"2026-07-05T06:25:28Z"},{"alias_kind":"pith_short_8","alias_value":"TTU6X4UM","created_at":"2026-07-05T06:25:28Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2023:TTU6X4UM46RFJBPMMO4FL2XZCW","target":"record","payload":{"canonical_record":{"source":{"id":"2305.00305","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2023-04-29T17:21:44Z","cross_cats_sorted":["astro-ph.GA","astro-ph.IM"],"title_canon_sha256":"c901d6c97906b5c58248663f0b5e62871661d86ff5c614cf6c453cf5edfec2ae","abstract_canon_sha256":"fd9c49e4fc3507920a42a5fade7aeb9b28f25f86b1636e30afea20978e6a5238"},"schema_version":"1.0"},"canonical_sha256":"9ce9ebf28ce7a25485ec63b855eaf915b5b26b08d719a2571f9babe74d328c5a","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T06:25:28.936985Z","signature_b64":"4FLX3ayYFbsgcubMNZKSiqRhYDkAQX2yq3NjXlxf486QXF53CwtBSzr6M17SLH6VHrRhI0EdUH92CoI2jliaCA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"9ce9ebf28ce7a25485ec63b855eaf915b5b26b08d719a2571f9babe74d328c5a","last_reissued_at":"2026-07-05T06:25:28.936429Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T06:25:28.936429Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2305.00305","source_version":2,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-07-05T06:25:28Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"mApj8hmmQpDdWw8SCAlyPxz8pSc/rH34UL+i+HMBTceFgr6ynxB0TPQ7wV5qxvcyoeGjXayFm5FkGvTzryv/AQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-08T05:05:12.759413Z"},"content_sha256":"93f7d067f089901b51c268cf50567e610a3ac06d9eb92369dd6f4009ad604244","schema_version":"1.0","event_id":"sha256:93f7d067f089901b51c268cf50567e610a3ac06d9eb92369dd6f4009ad604244"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2023:TTU6X4UM46RFJBPMMO4FL2XZCW","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"The IACOB project IX. Building a modern empirical database of Galactic O9-B9 supergiants: sample selection, description, and completeness","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.GA","astro-ph.IM"],"primary_cat":"astro-ph.SR","authors_text":"Abel de Burgos, Ignacio Negueruela, Miguel A. Urbaneja, Sergio Sim\\'on-D\\'iaz","submitted_at":"2023-04-29T17:21:44Z","abstract_excerpt":"Blue supergiants (BSGs) are important objects to study the intermediate phases of massive star evolution, helping to constrain evolutionary models. However, the lack of a holistic study of a statistically significant and unbiased sample of these objects makes several long-standing questions about their nature to remain unsolved. The present and other upcoming papers of the IACOB series are focused in studying - from a pure empirical point of view - a sample of 500 Galactic O9 - B9 stars with luminosity classes I and II (plus 250 late O- and early B-type stars with luminosity classes III, IV an"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2305.00305","kind":"arxiv","version":2},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/2305.00305/integrity.json","findings":[],"available":true,"detectors_run":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938"},"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":"2026-07-05T06:25:28Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"1G8e4nwQi1/jq2W9JieqpZNXu70O2jVUY954IxpfRHK00c/5E9EqUSDq9mb8JTgI7Nz4UeRYCvSVua78hFqvDA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-08T05:05:12.759931Z"},"content_sha256":"74befcf82b82bb9a3bb5ee51ca24454885cec0e1ec6e1c9bb8e9981ffb023001","schema_version":"1.0","event_id":"sha256:74befcf82b82bb9a3bb5ee51ca24454885cec0e1ec6e1c9bb8e9981ffb023001"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/TTU6X4UM46RFJBPMMO4FL2XZCW/bundle.json","state_url":"https://pith.science/pith/TTU6X4UM46RFJBPMMO4FL2XZCW/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/TTU6X4UM46RFJBPMMO4FL2XZCW/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":"2026-08-08T05:05:12Z","links":{"resolver":"https://pith.science/pith/TTU6X4UM46RFJBPMMO4FL2XZCW","bundle":"https://pith.science/pith/TTU6X4UM46RFJBPMMO4FL2XZCW/bundle.json","state":"https://pith.science/pith/TTU6X4UM46RFJBPMMO4FL2XZCW/state.json","well_known_bundle":"https://pith.science/.well-known/pith/TTU6X4UM46RFJBPMMO4FL2XZCW/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2023:TTU6X4UM46RFJBPMMO4FL2XZCW","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":"fd9c49e4fc3507920a42a5fade7aeb9b28f25f86b1636e30afea20978e6a5238","cross_cats_sorted":["astro-ph.GA","astro-ph.IM"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2023-04-29T17:21:44Z","title_canon_sha256":"c901d6c97906b5c58248663f0b5e62871661d86ff5c614cf6c453cf5edfec2ae"},"schema_version":"1.0","source":{"id":"2305.00305","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2305.00305","created_at":"2026-07-05T06:25:28Z"},{"alias_kind":"arxiv_version","alias_value":"2305.00305v2","created_at":"2026-07-05T06:25:28Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2305.00305","created_at":"2026-07-05T06:25:28Z"},{"alias_kind":"pith_short_12","alias_value":"TTU6X4UM46RF","created_at":"2026-07-05T06:25:28Z"},{"alias_kind":"pith_short_16","alias_value":"TTU6X4UM46RFJBPM","created_at":"2026-07-05T06:25:28Z"},{"alias_kind":"pith_short_8","alias_value":"TTU6X4UM","created_at":"2026-07-05T06:25:28Z"}],"graph_snapshots":[{"event_id":"sha256:74befcf82b82bb9a3bb5ee51ca24454885cec0e1ec6e1c9bb8e9981ffb023001","target":"graph","created_at":"2026-07-05T06:25:28Z","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/2305.00305/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"Blue supergiants (BSGs) are important objects to study the intermediate phases of massive star evolution, helping to constrain evolutionary models. However, the lack of a holistic study of a statistically significant and unbiased sample of these objects makes several long-standing questions about their nature to remain unsolved. The present and other upcoming papers of the IACOB series are focused in studying - from a pure empirical point of view - a sample of 500 Galactic O9 - B9 stars with luminosity classes I and II (plus 250 late O- and early B-type stars with luminosity classes III, IV an","authors_text":"Abel de Burgos, Ignacio Negueruela, Miguel A. Urbaneja, Sergio Sim\\'on-D\\'iaz","cross_cats":["astro-ph.GA","astro-ph.IM"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2023-04-29T17:21:44Z","title":"The IACOB project IX. Building a modern empirical database of Galactic O9-B9 supergiants: sample selection, description, and completeness"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2305.00305","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":"sha256:93f7d067f089901b51c268cf50567e610a3ac06d9eb92369dd6f4009ad604244","target":"record","created_at":"2026-07-05T06:25:28Z","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":"fd9c49e4fc3507920a42a5fade7aeb9b28f25f86b1636e30afea20978e6a5238","cross_cats_sorted":["astro-ph.GA","astro-ph.IM"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2023-04-29T17:21:44Z","title_canon_sha256":"c901d6c97906b5c58248663f0b5e62871661d86ff5c614cf6c453cf5edfec2ae"},"schema_version":"1.0","source":{"id":"2305.00305","kind":"arxiv","version":2}},"canonical_sha256":"9ce9ebf28ce7a25485ec63b855eaf915b5b26b08d719a2571f9babe74d328c5a","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"9ce9ebf28ce7a25485ec63b855eaf915b5b26b08d719a2571f9babe74d328c5a","first_computed_at":"2026-07-05T06:25:28.936429Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T06:25:28.936429Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"4FLX3ayYFbsgcubMNZKSiqRhYDkAQX2yq3NjXlxf486QXF53CwtBSzr6M17SLH6VHrRhI0EdUH92CoI2jliaCA==","signature_status":"signed_v1","signed_at":"2026-07-05T06:25:28.936985Z","signed_message":"canonical_sha256_bytes"},"source_id":"2305.00305","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:93f7d067f089901b51c268cf50567e610a3ac06d9eb92369dd6f4009ad604244","sha256:74befcf82b82bb9a3bb5ee51ca24454885cec0e1ec6e1c9bb8e9981ffb023001"],"state_sha256":"7d84ae55275cfa0a98040b9d3cd4f9d07fc92056d5f0139b5d37e6a9e922a83e"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"PM6fw55YVLYaiNGXJ3FLt73g+Uw0PGqEhqyAEvkFqEoWBUPYkEjqOta3R5e8UTYvVmY2wJxeYMiIU/mkKZiBDQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-08T05:05:12.765035Z","bundle_sha256":"5727a644106594ab638f63b7cdb1c88408ca2c1169e9152ed6d937e43850feed"}}