{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2020:XPNL3VHBSV52DCIUN6LWPQQULE","short_pith_number":"pith:XPNL3VHB","canonical_record":{"source":{"id":"2009.12779","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2020-09-27T07:53:46Z","cross_cats_sorted":["astro-ph.SR"],"title_canon_sha256":"3a307f729408aac15f2f42ff8aa38d19531653da65fe0dde9a212e1a4783a4d5","abstract_canon_sha256":"50a41b8d1d3ea42d925babfc380f3ff66d3d2ef69f1717448eebc9942c1913b6"},"schema_version":"1.0"},"canonical_sha256":"bbdabdd4e1957ba189146f9767c2145907a2335eced901e80139255912b7fe0c","source":{"kind":"arxiv","id":"2009.12779","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2009.12779","created_at":"2026-07-05T01:57:54Z"},{"alias_kind":"arxiv_version","alias_value":"2009.12779v1","created_at":"2026-07-05T01:57:54Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2009.12779","created_at":"2026-07-05T01:57:54Z"},{"alias_kind":"pith_short_12","alias_value":"XPNL3VHBSV52","created_at":"2026-07-05T01:57:54Z"},{"alias_kind":"pith_short_16","alias_value":"XPNL3VHBSV52DCIU","created_at":"2026-07-05T01:57:54Z"},{"alias_kind":"pith_short_8","alias_value":"XPNL3VHB","created_at":"2026-07-05T01:57:54Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2020:XPNL3VHBSV52DCIUN6LWPQQULE","target":"record","payload":{"canonical_record":{"source":{"id":"2009.12779","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2020-09-27T07:53:46Z","cross_cats_sorted":["astro-ph.SR"],"title_canon_sha256":"3a307f729408aac15f2f42ff8aa38d19531653da65fe0dde9a212e1a4783a4d5","abstract_canon_sha256":"50a41b8d1d3ea42d925babfc380f3ff66d3d2ef69f1717448eebc9942c1913b6"},"schema_version":"1.0"},"canonical_sha256":"bbdabdd4e1957ba189146f9767c2145907a2335eced901e80139255912b7fe0c","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T01:57:54.807205Z","signature_b64":"EgEnmlNavsGJ0SbtY0tbQMh9Tg3K0WtigGdJw/1a2X5W7nJIHoD445LJ9WwGitQy19Ba/6wYg5iCC6/LWqC2Aw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"bbdabdd4e1957ba189146f9767c2145907a2335eced901e80139255912b7fe0c","last_reissued_at":"2026-07-05T01:57:54.806429Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T01:57:54.806429Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2009.12779","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":"2026-07-05T01:57:54Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"3mHJbifSkdw0fYRxQNeO0VfrdO/1xlX9VdN7dMl8gLEFu5T6BomCHvdWwCrvxITJK5eaN3ydIiHU5dh4U7x7CA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-14T06:46:16.498219Z"},"content_sha256":"5fbab54d1da5db928ded71c3358abe1dbc310bed9745951cf9907235c62ef455","schema_version":"1.0","event_id":"sha256:5fbab54d1da5db928ded71c3358abe1dbc310bed9745951cf9907235c62ef455"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2020:XPNL3VHBSV52DCIUN6LWPQQULE","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"The historical record of massive star formation in Cygnus","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.SR"],"primary_cat":"astro-ph.GA","authors_text":"A.A. Djupvik, A. Pasquali, F. Comer\\'on, N. Schneider","submitted_at":"2020-09-27T07:53:46Z","abstract_excerpt":"The Cygnus region, which dominates the local spiral arm of the Galaxy, is one of the nearest complexes of massive star formation. Its massive stellar content, regions of ongoing star formation, and molecular gas have been studied in detail. However, little is known of the history of the region beyond the past 10 Myr. The brightness and spectroscopic characteristics of red supergiants make it easy to identify them and build up a virtually complete sample of such stars at the distance of the Cygnus region, thus providing a record of massive star formation extending several tens of Myr into the p"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2009.12779","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/2009.12779/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":"2026-07-05T01:57:54Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"NKqWBQ/K3h5GVs4yoUEF3qLV88gHH++IiGW3IScR1VA2t48+eNFLzeZI/XJflClRxjDUx1oLlFSgDbbPAmW6AQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-14T06:46:16.499105Z"},"content_sha256":"2195a40a11e52983d49d78238ef08d2e08a372125e70ca2bf91d6f293517b5b2","schema_version":"1.0","event_id":"sha256:2195a40a11e52983d49d78238ef08d2e08a372125e70ca2bf91d6f293517b5b2"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/XPNL3VHBSV52DCIUN6LWPQQULE/bundle.json","state_url":"https://pith.science/pith/XPNL3VHBSV52DCIUN6LWPQQULE/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/XPNL3VHBSV52DCIUN6LWPQQULE/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":"2026-08-14T06:46:16Z","links":{"resolver":"https://pith.science/pith/XPNL3VHBSV52DCIUN6LWPQQULE","bundle":"https://pith.science/pith/XPNL3VHBSV52DCIUN6LWPQQULE/bundle.json","state":"https://pith.science/pith/XPNL3VHBSV52DCIUN6LWPQQULE/state.json","well_known_bundle":"https://pith.science/.well-known/pith/XPNL3VHBSV52DCIUN6LWPQQULE/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2020:XPNL3VHBSV52DCIUN6LWPQQULE","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":"50a41b8d1d3ea42d925babfc380f3ff66d3d2ef69f1717448eebc9942c1913b6","cross_cats_sorted":["astro-ph.SR"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2020-09-27T07:53:46Z","title_canon_sha256":"3a307f729408aac15f2f42ff8aa38d19531653da65fe0dde9a212e1a4783a4d5"},"schema_version":"1.0","source":{"id":"2009.12779","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2009.12779","created_at":"2026-07-05T01:57:54Z"},{"alias_kind":"arxiv_version","alias_value":"2009.12779v1","created_at":"2026-07-05T01:57:54Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2009.12779","created_at":"2026-07-05T01:57:54Z"},{"alias_kind":"pith_short_12","alias_value":"XPNL3VHBSV52","created_at":"2026-07-05T01:57:54Z"},{"alias_kind":"pith_short_16","alias_value":"XPNL3VHBSV52DCIU","created_at":"2026-07-05T01:57:54Z"},{"alias_kind":"pith_short_8","alias_value":"XPNL3VHB","created_at":"2026-07-05T01:57:54Z"}],"graph_snapshots":[{"event_id":"sha256:2195a40a11e52983d49d78238ef08d2e08a372125e70ca2bf91d6f293517b5b2","target":"graph","created_at":"2026-07-05T01:57:54Z","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/2009.12779/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"The Cygnus region, which dominates the local spiral arm of the Galaxy, is one of the nearest complexes of massive star formation. Its massive stellar content, regions of ongoing star formation, and molecular gas have been studied in detail. However, little is known of the history of the region beyond the past 10 Myr. The brightness and spectroscopic characteristics of red supergiants make it easy to identify them and build up a virtually complete sample of such stars at the distance of the Cygnus region, thus providing a record of massive star formation extending several tens of Myr into the p","authors_text":"A.A. Djupvik, A. Pasquali, F. Comer\\'on, N. Schneider","cross_cats":["astro-ph.SR"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2020-09-27T07:53:46Z","title":"The historical record of massive star formation in Cygnus"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2009.12779","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":"sha256:5fbab54d1da5db928ded71c3358abe1dbc310bed9745951cf9907235c62ef455","target":"record","created_at":"2026-07-05T01:57:54Z","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":"50a41b8d1d3ea42d925babfc380f3ff66d3d2ef69f1717448eebc9942c1913b6","cross_cats_sorted":["astro-ph.SR"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2020-09-27T07:53:46Z","title_canon_sha256":"3a307f729408aac15f2f42ff8aa38d19531653da65fe0dde9a212e1a4783a4d5"},"schema_version":"1.0","source":{"id":"2009.12779","kind":"arxiv","version":1}},"canonical_sha256":"bbdabdd4e1957ba189146f9767c2145907a2335eced901e80139255912b7fe0c","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"bbdabdd4e1957ba189146f9767c2145907a2335eced901e80139255912b7fe0c","first_computed_at":"2026-07-05T01:57:54.806429Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T01:57:54.806429Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"EgEnmlNavsGJ0SbtY0tbQMh9Tg3K0WtigGdJw/1a2X5W7nJIHoD445LJ9WwGitQy19Ba/6wYg5iCC6/LWqC2Aw==","signature_status":"signed_v1","signed_at":"2026-07-05T01:57:54.807205Z","signed_message":"canonical_sha256_bytes"},"source_id":"2009.12779","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:5fbab54d1da5db928ded71c3358abe1dbc310bed9745951cf9907235c62ef455","sha256:2195a40a11e52983d49d78238ef08d2e08a372125e70ca2bf91d6f293517b5b2"],"state_sha256":"a427063f171569d78e873f2614a2041387905409b6c59f770210ba68609456e1"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"Jh8lB9KT4Nkko85EV2S5+ZZhkB/SZ5JxqDuMFqVwIqMn+XpgclQOn95RBFWVKMgMeF6W+KO8nhg2vK0pFOmMBg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-14T06:46:16.508202Z","bundle_sha256":"62b2efdc0ba2be11fe5d6b49eeef6c51fb665253564bd0df05da6776727558cc"}}