{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2020:ZMWO4VU4SGIKTPQ7TZAC2ROJHD","short_pith_number":"pith:ZMWO4VU4","canonical_record":{"source":{"id":"2012.05913","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"astro-ph.GA","submitted_at":"2020-12-10T18:13:30Z","cross_cats_sorted":["astro-ph.SR"],"title_canon_sha256":"fa82ed538fe29f5dd59eae10d964749fd3de25be5db7cedcf328d712e450d85d","abstract_canon_sha256":"a6e16d27702a2bac1433b2cf93ebd63e9afe54533aca785fb0967009f6347c5f"},"schema_version":"1.0"},"canonical_sha256":"cb2cee569c9190a9be1f9e402d45c938c05067e0f0e352264bc142e176bba442","source":{"kind":"arxiv","id":"2012.05913","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2012.05913","created_at":"2026-07-05T02:15:37Z"},{"alias_kind":"arxiv_version","alias_value":"2012.05913v1","created_at":"2026-07-05T02:15:37Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2012.05913","created_at":"2026-07-05T02:15:37Z"},{"alias_kind":"pith_short_12","alias_value":"ZMWO4VU4SGIK","created_at":"2026-07-05T02:15:37Z"},{"alias_kind":"pith_short_16","alias_value":"ZMWO4VU4SGIKTPQ7","created_at":"2026-07-05T02:15:37Z"},{"alias_kind":"pith_short_8","alias_value":"ZMWO4VU4","created_at":"2026-07-05T02:15:37Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2020:ZMWO4VU4SGIKTPQ7TZAC2ROJHD","target":"record","payload":{"canonical_record":{"source":{"id":"2012.05913","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"astro-ph.GA","submitted_at":"2020-12-10T18:13:30Z","cross_cats_sorted":["astro-ph.SR"],"title_canon_sha256":"fa82ed538fe29f5dd59eae10d964749fd3de25be5db7cedcf328d712e450d85d","abstract_canon_sha256":"a6e16d27702a2bac1433b2cf93ebd63e9afe54533aca785fb0967009f6347c5f"},"schema_version":"1.0"},"canonical_sha256":"cb2cee569c9190a9be1f9e402d45c938c05067e0f0e352264bc142e176bba442","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T02:15:37.900076Z","signature_b64":"HBvYW74By6Tuf93YLpi/OdK+NnivVUDsMQItNPYGCpkeiX+1T505KZVtyQYE0uUnJ5WIy20nQ5HPAHPv/R7TAA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"cb2cee569c9190a9be1f9e402d45c938c05067e0f0e352264bc142e176bba442","last_reissued_at":"2026-07-05T02:15:37.899719Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T02:15:37.899719Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2012.05913","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":"2026-07-05T02:15:37Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"Dyd2GP/wVqzQfO/4335qXtRt8/57ahePeWixSJRvDzU88pX+E1sSTNPSikJz0jQSol7YjKmS9gMpBlROmk2bAQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-07T11:09:05.003225Z"},"content_sha256":"c91af72f6177a97f9da08c6397cfe7b6ab592d3ef751aba988d3bf4add96cef4","schema_version":"1.0","event_id":"sha256:c91af72f6177a97f9da08c6397cfe7b6ab592d3ef751aba988d3bf4add96cef4"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2020:ZMWO4VU4SGIKTPQ7TZAC2ROJHD","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"A dearth of young and bright massive stars in the Small Magellanic Cloud","license":"http://creativecommons.org/licenses/by/4.0/","headline":"","cross_cats":["astro-ph.SR"],"primary_cat":"astro-ph.GA","authors_text":"A. de Koter, A. Schootemeijer, C. J. Evans, D. Lennon, I. Howarth, J. S. Vink, K.M. Menten, N. Langer, P. A. Crowther, S. Geen","submitted_at":"2020-12-10T18:13:30Z","abstract_excerpt":"Massive star evolution at low metallicity is closely connected to many fields in high-redshift astrophysics, but poorly understood. The Small Magellanic Cloud (SMC) is a unique laboratory to study this because of its metallicity of 0.2 Zsol, its proximity, and because it is currently forming stars. We used a spectral type catalog in combination with GAIA magnitudes to calculate temperatures and luminosities of bright SMC stars. By comparing these with literature studies, we tested the validity of our method, and using GAIA data, we estimated the completeness of stars in the catalog as a functi"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2012.05913","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":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/2012.05913/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":"2026-07-05T02:15:37Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"a8sZgCVpnup2Yad4oKDf2RuM5dt+V+hVAYW5koHJd8BerCVkvHPxJKSH33uhahG4F+LkYjx5foCJ8WdfzqByAg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-07T11:09:05.003621Z"},"content_sha256":"80a79b001b313238199d038caa198e4cdcb65a10a479b2e6c7f6f5c0a4d05643","schema_version":"1.0","event_id":"sha256:80a79b001b313238199d038caa198e4cdcb65a10a479b2e6c7f6f5c0a4d05643"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/ZMWO4VU4SGIKTPQ7TZAC2ROJHD/bundle.json","state_url":"https://pith.science/pith/ZMWO4VU4SGIKTPQ7TZAC2ROJHD/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/ZMWO4VU4SGIKTPQ7TZAC2ROJHD/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":"2026-07-07T11:09:05Z","links":{"resolver":"https://pith.science/pith/ZMWO4VU4SGIKTPQ7TZAC2ROJHD","bundle":"https://pith.science/pith/ZMWO4VU4SGIKTPQ7TZAC2ROJHD/bundle.json","state":"https://pith.science/pith/ZMWO4VU4SGIKTPQ7TZAC2ROJHD/state.json","well_known_bundle":"https://pith.science/.well-known/pith/ZMWO4VU4SGIKTPQ7TZAC2ROJHD/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2020:ZMWO4VU4SGIKTPQ7TZAC2ROJHD","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":"a6e16d27702a2bac1433b2cf93ebd63e9afe54533aca785fb0967009f6347c5f","cross_cats_sorted":["astro-ph.SR"],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"astro-ph.GA","submitted_at":"2020-12-10T18:13:30Z","title_canon_sha256":"fa82ed538fe29f5dd59eae10d964749fd3de25be5db7cedcf328d712e450d85d"},"schema_version":"1.0","source":{"id":"2012.05913","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2012.05913","created_at":"2026-07-05T02:15:37Z"},{"alias_kind":"arxiv_version","alias_value":"2012.05913v1","created_at":"2026-07-05T02:15:37Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2012.05913","created_at":"2026-07-05T02:15:37Z"},{"alias_kind":"pith_short_12","alias_value":"ZMWO4VU4SGIK","created_at":"2026-07-05T02:15:37Z"},{"alias_kind":"pith_short_16","alias_value":"ZMWO4VU4SGIKTPQ7","created_at":"2026-07-05T02:15:37Z"},{"alias_kind":"pith_short_8","alias_value":"ZMWO4VU4","created_at":"2026-07-05T02:15:37Z"}],"graph_snapshots":[{"event_id":"sha256:80a79b001b313238199d038caa198e4cdcb65a10a479b2e6c7f6f5c0a4d05643","target":"graph","created_at":"2026-07-05T02:15:37Z","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/2012.05913/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"Massive star evolution at low metallicity is closely connected to many fields in high-redshift astrophysics, but poorly understood. The Small Magellanic Cloud (SMC) is a unique laboratory to study this because of its metallicity of 0.2 Zsol, its proximity, and because it is currently forming stars. We used a spectral type catalog in combination with GAIA magnitudes to calculate temperatures and luminosities of bright SMC stars. By comparing these with literature studies, we tested the validity of our method, and using GAIA data, we estimated the completeness of stars in the catalog as a functi","authors_text":"A. de Koter, A. Schootemeijer, C. J. Evans, D. Lennon, I. Howarth, J. S. Vink, K.M. Menten, N. Langer, P. A. Crowther, S. Geen","cross_cats":["astro-ph.SR"],"headline":"","license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"astro-ph.GA","submitted_at":"2020-12-10T18:13:30Z","title":"A dearth of young and bright massive stars in the Small Magellanic Cloud"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2012.05913","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:c91af72f6177a97f9da08c6397cfe7b6ab592d3ef751aba988d3bf4add96cef4","target":"record","created_at":"2026-07-05T02:15:37Z","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":"a6e16d27702a2bac1433b2cf93ebd63e9afe54533aca785fb0967009f6347c5f","cross_cats_sorted":["astro-ph.SR"],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"astro-ph.GA","submitted_at":"2020-12-10T18:13:30Z","title_canon_sha256":"fa82ed538fe29f5dd59eae10d964749fd3de25be5db7cedcf328d712e450d85d"},"schema_version":"1.0","source":{"id":"2012.05913","kind":"arxiv","version":1}},"canonical_sha256":"cb2cee569c9190a9be1f9e402d45c938c05067e0f0e352264bc142e176bba442","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"cb2cee569c9190a9be1f9e402d45c938c05067e0f0e352264bc142e176bba442","first_computed_at":"2026-07-05T02:15:37.899719Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T02:15:37.899719Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"HBvYW74By6Tuf93YLpi/OdK+NnivVUDsMQItNPYGCpkeiX+1T505KZVtyQYE0uUnJ5WIy20nQ5HPAHPv/R7TAA==","signature_status":"signed_v1","signed_at":"2026-07-05T02:15:37.900076Z","signed_message":"canonical_sha256_bytes"},"source_id":"2012.05913","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:c91af72f6177a97f9da08c6397cfe7b6ab592d3ef751aba988d3bf4add96cef4","sha256:80a79b001b313238199d038caa198e4cdcb65a10a479b2e6c7f6f5c0a4d05643"],"state_sha256":"189bb78012a53588719fd4ce0cc57967a0571abca82ef3ae38c2bf80573565a1"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"Bcst5ODg0SqsWi+lsr3latKPRB88Rl5ogUqXbHl9XKOXNpQeaMJtd53MDffQXIe/Wmz4bVoO7IrCOXGz3SUsAA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-07-07T11:09:05.005579Z","bundle_sha256":"70d867efaf39724a0d28332ca73f6784ad1aeeccb7a521e793ca8af04ae4ae5e"}}