{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2006:HZIJ563A7E7RRPP2TSGAE2SFZH","short_pith_number":"pith:HZIJ563A","canonical_record":{"source":{"id":"astro-ph/0609659","kind":"arxiv","version":1},"metadata":{"license":"","primary_cat":"astro-ph","submitted_at":"2006-09-25T08:55:48Z","cross_cats_sorted":[],"title_canon_sha256":"0efd2ce88b1243ede5c8b8323a32a8f2bf0d5c7e021131d21d302b222df83445","abstract_canon_sha256":"49e636b503cbcdad4571a30fb8b89e707bcedfad5667887ec0fb2e6b465008b9"},"schema_version":"1.0"},"canonical_sha256":"3e509efb60f93f18bdfa9c8c026a45c9df980a3e278223cd9e37e82eb60f320e","source":{"kind":"arxiv","id":"astro-ph/0609659","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"astro-ph/0609659","created_at":"2026-05-18T01:40:29Z"},{"alias_kind":"arxiv_version","alias_value":"astro-ph/0609659v1","created_at":"2026-05-18T01:40:29Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.astro-ph/0609659","created_at":"2026-05-18T01:40:29Z"},{"alias_kind":"pith_short_12","alias_value":"HZIJ563A7E7R","created_at":"2026-05-18T12:25:53Z"},{"alias_kind":"pith_short_16","alias_value":"HZIJ563A7E7RRPP2","created_at":"2026-05-18T12:25:53Z"},{"alias_kind":"pith_short_8","alias_value":"HZIJ563A","created_at":"2026-05-18T12:25:53Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2006:HZIJ563A7E7RRPP2TSGAE2SFZH","target":"record","payload":{"canonical_record":{"source":{"id":"astro-ph/0609659","kind":"arxiv","version":1},"metadata":{"license":"","primary_cat":"astro-ph","submitted_at":"2006-09-25T08:55:48Z","cross_cats_sorted":[],"title_canon_sha256":"0efd2ce88b1243ede5c8b8323a32a8f2bf0d5c7e021131d21d302b222df83445","abstract_canon_sha256":"49e636b503cbcdad4571a30fb8b89e707bcedfad5667887ec0fb2e6b465008b9"},"schema_version":"1.0"},"canonical_sha256":"3e509efb60f93f18bdfa9c8c026a45c9df980a3e278223cd9e37e82eb60f320e","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:40:29.563221Z","signature_b64":"UZ+laujLEmVUqYFBCrhsXCZg0agijE4U29tlaAYH17X52dbQErNfmIbMVO5+9SvGZZOQwD9eSyQB5JEWBd/MCw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"3e509efb60f93f18bdfa9c8c026a45c9df980a3e278223cd9e37e82eb60f320e","last_reissued_at":"2026-05-18T01:40:29.562613Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:40:29.562613Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"astro-ph/0609659","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":"2026-05-18T01:40:29Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"dYK8XqpjJ+Xwnox2SWpoyihH1IOSedVrVwbjJ3yLRt0/hGPq9oigyak/NE/IrKu9LJFtkGjKzLBZtOpDo5prCw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-02T14:32:16.918911Z"},"content_sha256":"27472079d9b79f8de0d3cbce3d0d9e8a1e4f291f18b6ea45e87446cbc0525dd4","schema_version":"1.0","event_id":"sha256:27472079d9b79f8de0d3cbce3d0d9e8a1e4f291f18b6ea45e87446cbc0525dd4"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2006:HZIJ563A7E7RRPP2TSGAE2SFZH","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"IZw18, or the picture of Dorian Gray: the more you watch it, the older it gets","license":"","headline":"","cross_cats":[],"primary_cat":"astro-ph","authors_text":"A. Aloisi (ESA, J. Mack (STScI), M. Maio (INAF - Oabo), M. Tosi (INAF - Oabo), STScI)","submitted_at":"2006-09-25T08:55:48Z","abstract_excerpt":"IZw18 has been recurrently claimed to be a young galaxy, but stars of increasingly older ages are found every time deeper magnitude levels are reached with high-resolution photometry: from the original few Myrs to, possibly, several Gyrs. We summarize the history of IZw18's age and an HST project which will allow us to derive both its distance and age."},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"astro-ph/0609659","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":"2026-05-18T01:40:29Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"BIzUi19AfQC4qLMh5mv7KCooGKHUcq285xqNZ06iPyg97BsVsAwiUl4RdM5iS9/ETUzVZi6W8vJPpuDNuVaRCg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-02T14:32:16.919553Z"},"content_sha256":"a3a84bdcdab62e92da0ce2f302fed9a710171795869f4294c86c2006adb09475","schema_version":"1.0","event_id":"sha256:a3a84bdcdab62e92da0ce2f302fed9a710171795869f4294c86c2006adb09475"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/HZIJ563A7E7RRPP2TSGAE2SFZH/bundle.json","state_url":"https://pith.science/pith/HZIJ563A7E7RRPP2TSGAE2SFZH/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/HZIJ563A7E7RRPP2TSGAE2SFZH/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":"2026-06-02T14:32:16Z","links":{"resolver":"https://pith.science/pith/HZIJ563A7E7RRPP2TSGAE2SFZH","bundle":"https://pith.science/pith/HZIJ563A7E7RRPP2TSGAE2SFZH/bundle.json","state":"https://pith.science/pith/HZIJ563A7E7RRPP2TSGAE2SFZH/state.json","well_known_bundle":"https://pith.science/.well-known/pith/HZIJ563A7E7RRPP2TSGAE2SFZH/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2006:HZIJ563A7E7RRPP2TSGAE2SFZH","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":"49e636b503cbcdad4571a30fb8b89e707bcedfad5667887ec0fb2e6b465008b9","cross_cats_sorted":[],"license":"","primary_cat":"astro-ph","submitted_at":"2006-09-25T08:55:48Z","title_canon_sha256":"0efd2ce88b1243ede5c8b8323a32a8f2bf0d5c7e021131d21d302b222df83445"},"schema_version":"1.0","source":{"id":"astro-ph/0609659","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"astro-ph/0609659","created_at":"2026-05-18T01:40:29Z"},{"alias_kind":"arxiv_version","alias_value":"astro-ph/0609659v1","created_at":"2026-05-18T01:40:29Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.astro-ph/0609659","created_at":"2026-05-18T01:40:29Z"},{"alias_kind":"pith_short_12","alias_value":"HZIJ563A7E7R","created_at":"2026-05-18T12:25:53Z"},{"alias_kind":"pith_short_16","alias_value":"HZIJ563A7E7RRPP2","created_at":"2026-05-18T12:25:53Z"},{"alias_kind":"pith_short_8","alias_value":"HZIJ563A","created_at":"2026-05-18T12:25:53Z"}],"graph_snapshots":[{"event_id":"sha256:a3a84bdcdab62e92da0ce2f302fed9a710171795869f4294c86c2006adb09475","target":"graph","created_at":"2026-05-18T01:40:29Z","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":"IZw18 has been recurrently claimed to be a young galaxy, but stars of increasingly older ages are found every time deeper magnitude levels are reached with high-resolution photometry: from the original few Myrs to, possibly, several Gyrs. We summarize the history of IZw18's age and an HST project which will allow us to derive both its distance and age.","authors_text":"A. Aloisi (ESA, J. Mack (STScI), M. Maio (INAF - Oabo), M. Tosi (INAF - Oabo), STScI)","cross_cats":[],"headline":"","license":"","primary_cat":"astro-ph","submitted_at":"2006-09-25T08:55:48Z","title":"IZw18, or the picture of Dorian Gray: the more you watch it, the older it gets"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"astro-ph/0609659","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":"sha256:27472079d9b79f8de0d3cbce3d0d9e8a1e4f291f18b6ea45e87446cbc0525dd4","target":"record","created_at":"2026-05-18T01:40:29Z","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":"49e636b503cbcdad4571a30fb8b89e707bcedfad5667887ec0fb2e6b465008b9","cross_cats_sorted":[],"license":"","primary_cat":"astro-ph","submitted_at":"2006-09-25T08:55:48Z","title_canon_sha256":"0efd2ce88b1243ede5c8b8323a32a8f2bf0d5c7e021131d21d302b222df83445"},"schema_version":"1.0","source":{"id":"astro-ph/0609659","kind":"arxiv","version":1}},"canonical_sha256":"3e509efb60f93f18bdfa9c8c026a45c9df980a3e278223cd9e37e82eb60f320e","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"3e509efb60f93f18bdfa9c8c026a45c9df980a3e278223cd9e37e82eb60f320e","first_computed_at":"2026-05-18T01:40:29.562613Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:40:29.562613Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"UZ+laujLEmVUqYFBCrhsXCZg0agijE4U29tlaAYH17X52dbQErNfmIbMVO5+9SvGZZOQwD9eSyQB5JEWBd/MCw==","signature_status":"signed_v1","signed_at":"2026-05-18T01:40:29.563221Z","signed_message":"canonical_sha256_bytes"},"source_id":"astro-ph/0609659","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:27472079d9b79f8de0d3cbce3d0d9e8a1e4f291f18b6ea45e87446cbc0525dd4","sha256:a3a84bdcdab62e92da0ce2f302fed9a710171795869f4294c86c2006adb09475"],"state_sha256":"080eaf3cc0335907d6bd26df9ee33b16820e09d4036d8b5d0d59f4be6abfb3ce"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"WRMNmVU3aKiOKJJG4/uc6fhg6h8aOr5oJ6goQYcuTvpQxwLI3DSCNMbzwjl+xjrRxF0IMZc8HLqSHAtN26LVCQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-02T14:32:16.922859Z","bundle_sha256":"202e482a6d273e33306dc86300ba6f947151cc1a4fbada6475ac0cea5218ef3c"}}