{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2015:EEG4DWY4SKFBCAZZTUEPLEVNGB","short_pith_number":"pith:EEG4DWY4","canonical_record":{"source":{"id":"1501.02275","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2015-01-09T21:09:47Z","cross_cats_sorted":["astro-ph.SR"],"title_canon_sha256":"47466385e40e4a68076e6ccefe932ec5bbed6f2159ba8bba4f1dffdb7ce7b03e","abstract_canon_sha256":"ccad40f5c2807d3a818320d6e094e22f92da3b136d9d3ee7d8975ba021a31406"},"schema_version":"1.0"},"canonical_sha256":"210dc1db1c928a1103399d08f592ad3071d835381d9dce6613f2fd63162875c8","source":{"kind":"arxiv","id":"1501.02275","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1501.02275","created_at":"2026-05-18T01:41:11Z"},{"alias_kind":"arxiv_version","alias_value":"1501.02275v1","created_at":"2026-05-18T01:41:11Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1501.02275","created_at":"2026-05-18T01:41:11Z"},{"alias_kind":"pith_short_12","alias_value":"EEG4DWY4SKFB","created_at":"2026-05-18T12:29:19Z"},{"alias_kind":"pith_short_16","alias_value":"EEG4DWY4SKFBCAZZ","created_at":"2026-05-18T12:29:19Z"},{"alias_kind":"pith_short_8","alias_value":"EEG4DWY4","created_at":"2026-05-18T12:29:19Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2015:EEG4DWY4SKFBCAZZTUEPLEVNGB","target":"record","payload":{"canonical_record":{"source":{"id":"1501.02275","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2015-01-09T21:09:47Z","cross_cats_sorted":["astro-ph.SR"],"title_canon_sha256":"47466385e40e4a68076e6ccefe932ec5bbed6f2159ba8bba4f1dffdb7ce7b03e","abstract_canon_sha256":"ccad40f5c2807d3a818320d6e094e22f92da3b136d9d3ee7d8975ba021a31406"},"schema_version":"1.0"},"canonical_sha256":"210dc1db1c928a1103399d08f592ad3071d835381d9dce6613f2fd63162875c8","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:41:11.811468Z","signature_b64":"Vgcm3r9CF61bgIv4csjpeajzBDdBctl7Wz29AWfZLBgvVV6L1vaoGzVkehKWXUOiU73MkcPjTwvLIBnTPKIwBQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"210dc1db1c928a1103399d08f592ad3071d835381d9dce6613f2fd63162875c8","last_reissued_at":"2026-05-18T01:41:11.811069Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:41:11.811069Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1501.02275","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":"2026-05-18T01:41:11Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"kYPP9ZJKdbyBQWvUp8DjbteCBbYqBldmfo03L75d9xYmNXVxeBDNUC3qQ4OA2KglV3tMBJJHdHEfN52brasmAQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-08T14:33:29.636839Z"},"content_sha256":"65ecb6f70400b8c88a4fad6fa4243a917f0eab69ed85cfb9b0b9e72db8c65dbb","schema_version":"1.0","event_id":"sha256:65ecb6f70400b8c88a4fad6fa4243a917f0eab69ed85cfb9b0b9e72db8c65dbb"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2015:EEG4DWY4SKFBCAZZTUEPLEVNGB","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"No Evidence for Significant Age Spreads in Young Massive LMC Clusters","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.SR"],"primary_cat":"astro-ph.GA","authors_text":"Esteban Silva-Villa, Florian Niederhofer, Michael Hilker, Nate Bastian","submitted_at":"2015-01-09T21:09:47Z","abstract_excerpt":"Recent discoveries have put the picture of stellar clusters being simple stellar populations into question. In particular, the color-magnitude diagrams of intermediate age (1-2 Gyr) massive clusters in the Large Magellanic Cloud (LMC) show features that could be interpreted as age spreads of 100-500 Myr. If multiple generations of stars are present in these clusters then, as a consequence, young (<1 Gyr) clusters with similar properties should have age spreads of the same order. In this paper we use archival Hubble Space Telescope (HST) data of eight young massive LMC clusters (NGC 1831, NGC 1"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1501.02275","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":"2026-05-18T01:41:11Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"sQPkoyiOOG+vTyA7VJJ/HYGlIDlWS8rGZ1b3tGWVzofDjK96o4j4Fwzzb38XFIx+7tO+9/sDWuuDkrb22Nm5Aw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-08T14:33:29.637497Z"},"content_sha256":"dc9c1389a7ca3676fafe4759655278cbbc60a638a06fb41d4dbb16d58398ca61","schema_version":"1.0","event_id":"sha256:dc9c1389a7ca3676fafe4759655278cbbc60a638a06fb41d4dbb16d58398ca61"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/EEG4DWY4SKFBCAZZTUEPLEVNGB/bundle.json","state_url":"https://pith.science/pith/EEG4DWY4SKFBCAZZTUEPLEVNGB/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/EEG4DWY4SKFBCAZZTUEPLEVNGB/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":"2026-06-08T14:33:29Z","links":{"resolver":"https://pith.science/pith/EEG4DWY4SKFBCAZZTUEPLEVNGB","bundle":"https://pith.science/pith/EEG4DWY4SKFBCAZZTUEPLEVNGB/bundle.json","state":"https://pith.science/pith/EEG4DWY4SKFBCAZZTUEPLEVNGB/state.json","well_known_bundle":"https://pith.science/.well-known/pith/EEG4DWY4SKFBCAZZTUEPLEVNGB/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2015:EEG4DWY4SKFBCAZZTUEPLEVNGB","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":"ccad40f5c2807d3a818320d6e094e22f92da3b136d9d3ee7d8975ba021a31406","cross_cats_sorted":["astro-ph.SR"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2015-01-09T21:09:47Z","title_canon_sha256":"47466385e40e4a68076e6ccefe932ec5bbed6f2159ba8bba4f1dffdb7ce7b03e"},"schema_version":"1.0","source":{"id":"1501.02275","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1501.02275","created_at":"2026-05-18T01:41:11Z"},{"alias_kind":"arxiv_version","alias_value":"1501.02275v1","created_at":"2026-05-18T01:41:11Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1501.02275","created_at":"2026-05-18T01:41:11Z"},{"alias_kind":"pith_short_12","alias_value":"EEG4DWY4SKFB","created_at":"2026-05-18T12:29:19Z"},{"alias_kind":"pith_short_16","alias_value":"EEG4DWY4SKFBCAZZ","created_at":"2026-05-18T12:29:19Z"},{"alias_kind":"pith_short_8","alias_value":"EEG4DWY4","created_at":"2026-05-18T12:29:19Z"}],"graph_snapshots":[{"event_id":"sha256:dc9c1389a7ca3676fafe4759655278cbbc60a638a06fb41d4dbb16d58398ca61","target":"graph","created_at":"2026-05-18T01:41:11Z","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":"Recent discoveries have put the picture of stellar clusters being simple stellar populations into question. In particular, the color-magnitude diagrams of intermediate age (1-2 Gyr) massive clusters in the Large Magellanic Cloud (LMC) show features that could be interpreted as age spreads of 100-500 Myr. If multiple generations of stars are present in these clusters then, as a consequence, young (<1 Gyr) clusters with similar properties should have age spreads of the same order. In this paper we use archival Hubble Space Telescope (HST) data of eight young massive LMC clusters (NGC 1831, NGC 1","authors_text":"Esteban Silva-Villa, Florian Niederhofer, Michael Hilker, Nate Bastian","cross_cats":["astro-ph.SR"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2015-01-09T21:09:47Z","title":"No Evidence for Significant Age Spreads in Young Massive LMC Clusters"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1501.02275","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":"sha256:65ecb6f70400b8c88a4fad6fa4243a917f0eab69ed85cfb9b0b9e72db8c65dbb","target":"record","created_at":"2026-05-18T01:41:11Z","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":"ccad40f5c2807d3a818320d6e094e22f92da3b136d9d3ee7d8975ba021a31406","cross_cats_sorted":["astro-ph.SR"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2015-01-09T21:09:47Z","title_canon_sha256":"47466385e40e4a68076e6ccefe932ec5bbed6f2159ba8bba4f1dffdb7ce7b03e"},"schema_version":"1.0","source":{"id":"1501.02275","kind":"arxiv","version":1}},"canonical_sha256":"210dc1db1c928a1103399d08f592ad3071d835381d9dce6613f2fd63162875c8","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"210dc1db1c928a1103399d08f592ad3071d835381d9dce6613f2fd63162875c8","first_computed_at":"2026-05-18T01:41:11.811069Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:41:11.811069Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"Vgcm3r9CF61bgIv4csjpeajzBDdBctl7Wz29AWfZLBgvVV6L1vaoGzVkehKWXUOiU73MkcPjTwvLIBnTPKIwBQ==","signature_status":"signed_v1","signed_at":"2026-05-18T01:41:11.811468Z","signed_message":"canonical_sha256_bytes"},"source_id":"1501.02275","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:65ecb6f70400b8c88a4fad6fa4243a917f0eab69ed85cfb9b0b9e72db8c65dbb","sha256:dc9c1389a7ca3676fafe4759655278cbbc60a638a06fb41d4dbb16d58398ca61"],"state_sha256":"4179158ab17e8a30560f5447710a4bca7b0177c62725e5ce8f22304654c550f3"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"7vBytoFLfXOp9o8dR8/erlvyIBt+AlkXto1jfrpFHgjFS9HHemWjx17yENrTszx+tovkw0S1OeH+OO/konGJCw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-08T14:33:29.640621Z","bundle_sha256":"cb68ec58cbc4b9fe42e5f9cf993acdb2e093da8043cc9842aa50f37c26d82787"}}