{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2016:5NC5YFQUIZZ7J6CNIEI7YGMPNE","short_pith_number":"pith:5NC5YFQU","canonical_record":{"source":{"id":"1611.02452","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2016-11-08T09:52:49Z","cross_cats_sorted":[],"title_canon_sha256":"eb33376af253f4c2b5e60df1ca4856e49162ab454120e336a9bf8afeb71e3894","abstract_canon_sha256":"d254051606ea2becba84cabc6a2b029e2a52d5195581d863a596edef7ac58fd3"},"schema_version":"1.0"},"canonical_sha256":"eb45dc16144673f4f84d4111fc198f691174039808aae0fcc84a96d84c778179","source":{"kind":"arxiv","id":"1611.02452","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1611.02452","created_at":"2026-05-18T00:51:13Z"},{"alias_kind":"arxiv_version","alias_value":"1611.02452v1","created_at":"2026-05-18T00:51:13Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1611.02452","created_at":"2026-05-18T00:51:13Z"},{"alias_kind":"pith_short_12","alias_value":"5NC5YFQUIZZ7","created_at":"2026-05-18T12:30:01Z"},{"alias_kind":"pith_short_16","alias_value":"5NC5YFQUIZZ7J6CN","created_at":"2026-05-18T12:30:01Z"},{"alias_kind":"pith_short_8","alias_value":"5NC5YFQU","created_at":"2026-05-18T12:30:01Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2016:5NC5YFQUIZZ7J6CNIEI7YGMPNE","target":"record","payload":{"canonical_record":{"source":{"id":"1611.02452","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2016-11-08T09:52:49Z","cross_cats_sorted":[],"title_canon_sha256":"eb33376af253f4c2b5e60df1ca4856e49162ab454120e336a9bf8afeb71e3894","abstract_canon_sha256":"d254051606ea2becba84cabc6a2b029e2a52d5195581d863a596edef7ac58fd3"},"schema_version":"1.0"},"canonical_sha256":"eb45dc16144673f4f84d4111fc198f691174039808aae0fcc84a96d84c778179","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T00:51:13.261141Z","signature_b64":"vDSjQj1P7sO6fIJDqaWBUkj/wHOzFkXOVEVFSFBGTAsRt/Vsd1ae17TQ+43jE8OND0kVg7SeNxDxVht2FGmeDg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"eb45dc16144673f4f84d4111fc198f691174039808aae0fcc84a96d84c778179","last_reissued_at":"2026-05-18T00:51:13.260340Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T00:51:13.260340Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1611.02452","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":"2026-05-18T00:51:13Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"OzlkiMJ9z4Z1lMsGAxsY8II2HaHzdSuy6anDKIirteQw+hhR0+RSlbAS1QoBNYzTCRkoKJKXn4m0La3AlSYaDw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-07T02:45:09.298340Z"},"content_sha256":"03312b205c6781fa5fa3ade4956fd35743fa9551aa6f06b5dd1f3b25b998e53a","schema_version":"1.0","event_id":"sha256:03312b205c6781fa5fa3ade4956fd35743fa9551aa6f06b5dd1f3b25b998e53a"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2016:5NC5YFQUIZZ7J6CNIEI7YGMPNE","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Variability survey of brightest stars in selected OB associations","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.SR","authors_text":"Indrek Kolka, Jaan Laur, Laurits Leedj\\\"arv, Taavi Tuvikene, T\\~onis Eenm\\\"ae","submitted_at":"2016-11-08T09:52:49Z","abstract_excerpt":"The stellar evolution theory of massive stars remains uncalibrated with high-precision photometric observational data mainly due to a small number of luminous stars that are monitored from space. Automated all-sky surveys have revealed numerous variable stars but most of the luminous stars are often overexposed. Targeted campaigns can improve the time base of photometric data for those objects.\n  The aim of this investigation is to study the variability of luminous stars at different timescales in young open clusters and OB associations.\n  We monitored 22 open clusters and associations from 20"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1611.02452","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":"2026-05-18T00:51:13Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"TBOnKAg5vsBR0yBMFaaRIwPlCYD1MyMtEcrDR3kk2Gt3uYbQJmlj7LQcRe/G4zQ584xd9YBFoKDVKwh91nYQAg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-07T02:45:09.298904Z"},"content_sha256":"1f014e6afdf7f568961bc321422799ebfa808d471575604d070948ba725fc49b","schema_version":"1.0","event_id":"sha256:1f014e6afdf7f568961bc321422799ebfa808d471575604d070948ba725fc49b"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/5NC5YFQUIZZ7J6CNIEI7YGMPNE/bundle.json","state_url":"https://pith.science/pith/5NC5YFQUIZZ7J6CNIEI7YGMPNE/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/5NC5YFQUIZZ7J6CNIEI7YGMPNE/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":"2026-06-07T02:45:09Z","links":{"resolver":"https://pith.science/pith/5NC5YFQUIZZ7J6CNIEI7YGMPNE","bundle":"https://pith.science/pith/5NC5YFQUIZZ7J6CNIEI7YGMPNE/bundle.json","state":"https://pith.science/pith/5NC5YFQUIZZ7J6CNIEI7YGMPNE/state.json","well_known_bundle":"https://pith.science/.well-known/pith/5NC5YFQUIZZ7J6CNIEI7YGMPNE/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2016:5NC5YFQUIZZ7J6CNIEI7YGMPNE","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":"d254051606ea2becba84cabc6a2b029e2a52d5195581d863a596edef7ac58fd3","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2016-11-08T09:52:49Z","title_canon_sha256":"eb33376af253f4c2b5e60df1ca4856e49162ab454120e336a9bf8afeb71e3894"},"schema_version":"1.0","source":{"id":"1611.02452","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1611.02452","created_at":"2026-05-18T00:51:13Z"},{"alias_kind":"arxiv_version","alias_value":"1611.02452v1","created_at":"2026-05-18T00:51:13Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1611.02452","created_at":"2026-05-18T00:51:13Z"},{"alias_kind":"pith_short_12","alias_value":"5NC5YFQUIZZ7","created_at":"2026-05-18T12:30:01Z"},{"alias_kind":"pith_short_16","alias_value":"5NC5YFQUIZZ7J6CN","created_at":"2026-05-18T12:30:01Z"},{"alias_kind":"pith_short_8","alias_value":"5NC5YFQU","created_at":"2026-05-18T12:30:01Z"}],"graph_snapshots":[{"event_id":"sha256:1f014e6afdf7f568961bc321422799ebfa808d471575604d070948ba725fc49b","target":"graph","created_at":"2026-05-18T00:51:13Z","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":"The stellar evolution theory of massive stars remains uncalibrated with high-precision photometric observational data mainly due to a small number of luminous stars that are monitored from space. Automated all-sky surveys have revealed numerous variable stars but most of the luminous stars are often overexposed. Targeted campaigns can improve the time base of photometric data for those objects.\n  The aim of this investigation is to study the variability of luminous stars at different timescales in young open clusters and OB associations.\n  We monitored 22 open clusters and associations from 20","authors_text":"Indrek Kolka, Jaan Laur, Laurits Leedj\\\"arv, Taavi Tuvikene, T\\~onis Eenm\\\"ae","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2016-11-08T09:52:49Z","title":"Variability survey of brightest stars in selected OB associations"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1611.02452","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":"sha256:03312b205c6781fa5fa3ade4956fd35743fa9551aa6f06b5dd1f3b25b998e53a","target":"record","created_at":"2026-05-18T00:51:13Z","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":"d254051606ea2becba84cabc6a2b029e2a52d5195581d863a596edef7ac58fd3","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2016-11-08T09:52:49Z","title_canon_sha256":"eb33376af253f4c2b5e60df1ca4856e49162ab454120e336a9bf8afeb71e3894"},"schema_version":"1.0","source":{"id":"1611.02452","kind":"arxiv","version":1}},"canonical_sha256":"eb45dc16144673f4f84d4111fc198f691174039808aae0fcc84a96d84c778179","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"eb45dc16144673f4f84d4111fc198f691174039808aae0fcc84a96d84c778179","first_computed_at":"2026-05-18T00:51:13.260340Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:51:13.260340Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"vDSjQj1P7sO6fIJDqaWBUkj/wHOzFkXOVEVFSFBGTAsRt/Vsd1ae17TQ+43jE8OND0kVg7SeNxDxVht2FGmeDg==","signature_status":"signed_v1","signed_at":"2026-05-18T00:51:13.261141Z","signed_message":"canonical_sha256_bytes"},"source_id":"1611.02452","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:03312b205c6781fa5fa3ade4956fd35743fa9551aa6f06b5dd1f3b25b998e53a","sha256:1f014e6afdf7f568961bc321422799ebfa808d471575604d070948ba725fc49b"],"state_sha256":"d18ab5155dc21e80c8ce4eb21a70946d6b88525427048b95b3365b0344723b76"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"6SO/9r27cWm0V0TmhHF9X0sWSkmT8W1A2lzIOLPbsHaUUwVV+Sx5ahyfYMeTjSdj05u5Gd6VtvwreEkRCs+CAg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-07T02:45:09.304449Z","bundle_sha256":"1666906d76be59f5fb91b391d38dba24f3eee0e44678ba56bbf472575719702e"}}