{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2016:Z6JFXGY24HFFDM5DXNSLVP2KUF","short_pith_number":"pith:Z6JFXGY2","canonical_record":{"source":{"id":"1608.07798","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2016-08-28T10:20:54Z","cross_cats_sorted":[],"title_canon_sha256":"61a260e2b7c5e6b41f70ebfe0f85d37a053e806b37635c473b41d47be980c530","abstract_canon_sha256":"c7e4ab6d914c86a1146671d2377a6a9fcdf8690de425228793133cc15494e9c5"},"schema_version":"1.0"},"canonical_sha256":"cf925b9b1ae1ca51b3a3bb64babf4aa16805d43eb767c9cb3c0eb71cdcdfff5c","source":{"kind":"arxiv","id":"1608.07798","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1608.07798","created_at":"2026-05-18T00:59:57Z"},{"alias_kind":"arxiv_version","alias_value":"1608.07798v1","created_at":"2026-05-18T00:59:57Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1608.07798","created_at":"2026-05-18T00:59:57Z"},{"alias_kind":"pith_short_12","alias_value":"Z6JFXGY24HFF","created_at":"2026-05-18T12:30:53Z"},{"alias_kind":"pith_short_16","alias_value":"Z6JFXGY24HFFDM5D","created_at":"2026-05-18T12:30:53Z"},{"alias_kind":"pith_short_8","alias_value":"Z6JFXGY2","created_at":"2026-05-18T12:30:53Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2016:Z6JFXGY24HFFDM5DXNSLVP2KUF","target":"record","payload":{"canonical_record":{"source":{"id":"1608.07798","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2016-08-28T10:20:54Z","cross_cats_sorted":[],"title_canon_sha256":"61a260e2b7c5e6b41f70ebfe0f85d37a053e806b37635c473b41d47be980c530","abstract_canon_sha256":"c7e4ab6d914c86a1146671d2377a6a9fcdf8690de425228793133cc15494e9c5"},"schema_version":"1.0"},"canonical_sha256":"cf925b9b1ae1ca51b3a3bb64babf4aa16805d43eb767c9cb3c0eb71cdcdfff5c","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T00:59:57.358447Z","signature_b64":"LGpsTaP7cgB1kthRfllhK8St/8Td5ysJKDe3q5G7DOKqYWXUYicW1RxaDE4UAc5GVX1apF4AmtEnqH9Q6R8dCQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"cf925b9b1ae1ca51b3a3bb64babf4aa16805d43eb767c9cb3c0eb71cdcdfff5c","last_reissued_at":"2026-05-18T00:59:57.357955Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T00:59:57.357955Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1608.07798","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":"2026-05-18T00:59:57Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"hdkDHCjeLuNe2m6iu76uFaGs1Q8hl9PqPDGzyuxqrUTfYz0EXHZojXVc7w1Q4rs4fIeJpx0k91yaFptT7dxMCA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-02T04:53:38.933200Z"},"content_sha256":"199fc4d31484fc11baf662b2f93d8d50756d9a448731c9e7ad81c34030224f5d","schema_version":"1.0","event_id":"sha256:199fc4d31484fc11baf662b2f93d8d50756d9a448731c9e7ad81c34030224f5d"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2016:Z6JFXGY24HFFDM5DXNSLVP2KUF","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"A constraint on the formation timescale of the young open cluster NGC 2264: Lithium abundance of pre-main sequence stars","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.SR","authors_text":"Beomdu Lim, Byeong-Gon Park, Hwankyung Sung, Jinyoung S. Kim, Michael S. Bessell, Narae Hwang","submitted_at":"2016-08-28T10:20:54Z","abstract_excerpt":"The timescale of cluster formation is an essential parameter in order to understand the formation process of star clusters. Pre-main sequence (PMS) stars in nearby young open clusters reveal a large spread in brightness. If the spread were considered as a result of a real spread in age, the corresponding cluster formation timescale would be about 5 -- 20 Myr. Hence it could be interpreted that star formation in an open cluster is prolonged for up to a few tens of Myr. However, difficulties in reddening correction, observational errors, and systematic uncertainties introduced by imperfect evolu"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1608.07798","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":"2026-05-18T00:59:57Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"mvcto98QJtIU7bjmRZzdMYvQKyGhgQ/x9leW7fzpP1tRDxP6mL7d6dQdTmizWQpuaNadUmefXzoEW6Y7MVQgDw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-02T04:53:38.933584Z"},"content_sha256":"ed7fc09fe0d575fcf36647ec5abd7fdf74cba2181936a837b82cc940b589a43f","schema_version":"1.0","event_id":"sha256:ed7fc09fe0d575fcf36647ec5abd7fdf74cba2181936a837b82cc940b589a43f"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/Z6JFXGY24HFFDM5DXNSLVP2KUF/bundle.json","state_url":"https://pith.science/pith/Z6JFXGY24HFFDM5DXNSLVP2KUF/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/Z6JFXGY24HFFDM5DXNSLVP2KUF/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":"2026-06-02T04:53:38Z","links":{"resolver":"https://pith.science/pith/Z6JFXGY24HFFDM5DXNSLVP2KUF","bundle":"https://pith.science/pith/Z6JFXGY24HFFDM5DXNSLVP2KUF/bundle.json","state":"https://pith.science/pith/Z6JFXGY24HFFDM5DXNSLVP2KUF/state.json","well_known_bundle":"https://pith.science/.well-known/pith/Z6JFXGY24HFFDM5DXNSLVP2KUF/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2016:Z6JFXGY24HFFDM5DXNSLVP2KUF","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":"c7e4ab6d914c86a1146671d2377a6a9fcdf8690de425228793133cc15494e9c5","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2016-08-28T10:20:54Z","title_canon_sha256":"61a260e2b7c5e6b41f70ebfe0f85d37a053e806b37635c473b41d47be980c530"},"schema_version":"1.0","source":{"id":"1608.07798","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1608.07798","created_at":"2026-05-18T00:59:57Z"},{"alias_kind":"arxiv_version","alias_value":"1608.07798v1","created_at":"2026-05-18T00:59:57Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1608.07798","created_at":"2026-05-18T00:59:57Z"},{"alias_kind":"pith_short_12","alias_value":"Z6JFXGY24HFF","created_at":"2026-05-18T12:30:53Z"},{"alias_kind":"pith_short_16","alias_value":"Z6JFXGY24HFFDM5D","created_at":"2026-05-18T12:30:53Z"},{"alias_kind":"pith_short_8","alias_value":"Z6JFXGY2","created_at":"2026-05-18T12:30:53Z"}],"graph_snapshots":[{"event_id":"sha256:ed7fc09fe0d575fcf36647ec5abd7fdf74cba2181936a837b82cc940b589a43f","target":"graph","created_at":"2026-05-18T00:59:57Z","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 timescale of cluster formation is an essential parameter in order to understand the formation process of star clusters. Pre-main sequence (PMS) stars in nearby young open clusters reveal a large spread in brightness. If the spread were considered as a result of a real spread in age, the corresponding cluster formation timescale would be about 5 -- 20 Myr. Hence it could be interpreted that star formation in an open cluster is prolonged for up to a few tens of Myr. However, difficulties in reddening correction, observational errors, and systematic uncertainties introduced by imperfect evolu","authors_text":"Beomdu Lim, Byeong-Gon Park, Hwankyung Sung, Jinyoung S. Kim, Michael S. Bessell, Narae Hwang","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2016-08-28T10:20:54Z","title":"A constraint on the formation timescale of the young open cluster NGC 2264: Lithium abundance of pre-main sequence stars"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1608.07798","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":"sha256:199fc4d31484fc11baf662b2f93d8d50756d9a448731c9e7ad81c34030224f5d","target":"record","created_at":"2026-05-18T00:59:57Z","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":"c7e4ab6d914c86a1146671d2377a6a9fcdf8690de425228793133cc15494e9c5","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2016-08-28T10:20:54Z","title_canon_sha256":"61a260e2b7c5e6b41f70ebfe0f85d37a053e806b37635c473b41d47be980c530"},"schema_version":"1.0","source":{"id":"1608.07798","kind":"arxiv","version":1}},"canonical_sha256":"cf925b9b1ae1ca51b3a3bb64babf4aa16805d43eb767c9cb3c0eb71cdcdfff5c","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"cf925b9b1ae1ca51b3a3bb64babf4aa16805d43eb767c9cb3c0eb71cdcdfff5c","first_computed_at":"2026-05-18T00:59:57.357955Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:59:57.357955Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"LGpsTaP7cgB1kthRfllhK8St/8Td5ysJKDe3q5G7DOKqYWXUYicW1RxaDE4UAc5GVX1apF4AmtEnqH9Q6R8dCQ==","signature_status":"signed_v1","signed_at":"2026-05-18T00:59:57.358447Z","signed_message":"canonical_sha256_bytes"},"source_id":"1608.07798","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:199fc4d31484fc11baf662b2f93d8d50756d9a448731c9e7ad81c34030224f5d","sha256:ed7fc09fe0d575fcf36647ec5abd7fdf74cba2181936a837b82cc940b589a43f"],"state_sha256":"edf96f244dd39f837dce3056ebde7cf42f58a6e2402bafa5e1786873a97ac8d1"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"ba3pEcrZRiv0BfeSIo1iZBvqzhPk+8o+HjprUJCzkQ9Kp2q5Wn69Ug+mWZEAX4NYLTeCOqVDPgSgqy7YxvrgDw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-02T04:53:38.935739Z","bundle_sha256":"7968c51bf8a1ffaa3dcbe300b866e380397e97562efe52ce7e99b7fa67e4a7a1"}}