{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2018:YT35AHZZIBXXNWS6744KBRF4OS","short_pith_number":"pith:YT35AHZZ","canonical_record":{"source":{"id":"1801.10185","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2018-01-30T19:42:39Z","cross_cats_sorted":[],"title_canon_sha256":"eaee07b00cdc17ebce8a954d0a102ad8b156b7a24cff82483cf311d39914c558","abstract_canon_sha256":"f141112f6f28b54b6483b7b3225166556383e923d9df79d4e7ca652344b74a7f"},"schema_version":"1.0"},"canonical_sha256":"c4f7d01f39406f76da5eff38a0c4bc74bb4a720cd4f8f4215635d6e83d40b79f","source":{"kind":"arxiv","id":"1801.10185","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1801.10185","created_at":"2026-05-18T00:22:22Z"},{"alias_kind":"arxiv_version","alias_value":"1801.10185v1","created_at":"2026-05-18T00:22:22Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1801.10185","created_at":"2026-05-18T00:22:22Z"},{"alias_kind":"pith_short_12","alias_value":"YT35AHZZIBXX","created_at":"2026-05-18T12:33:04Z"},{"alias_kind":"pith_short_16","alias_value":"YT35AHZZIBXXNWS6","created_at":"2026-05-18T12:33:04Z"},{"alias_kind":"pith_short_8","alias_value":"YT35AHZZ","created_at":"2026-05-18T12:33:04Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2018:YT35AHZZIBXXNWS6744KBRF4OS","target":"record","payload":{"canonical_record":{"source":{"id":"1801.10185","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2018-01-30T19:42:39Z","cross_cats_sorted":[],"title_canon_sha256":"eaee07b00cdc17ebce8a954d0a102ad8b156b7a24cff82483cf311d39914c558","abstract_canon_sha256":"f141112f6f28b54b6483b7b3225166556383e923d9df79d4e7ca652344b74a7f"},"schema_version":"1.0"},"canonical_sha256":"c4f7d01f39406f76da5eff38a0c4bc74bb4a720cd4f8f4215635d6e83d40b79f","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T00:22:22.818116Z","signature_b64":"t6YJujXa6U2s3isz+CfAZ3EjgA+/WIkE967ciHenHM374R/yKdrAdZzwfvDzP/EcHcIVBmZx5f7CBljFCTISAw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"c4f7d01f39406f76da5eff38a0c4bc74bb4a720cd4f8f4215635d6e83d40b79f","last_reissued_at":"2026-05-18T00:22:22.817414Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T00:22:22.817414Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1801.10185","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":"2026-05-18T00:22:22Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"mUVjC5Rvf0cd2gP59gGbRnoIOnlldAt8MLEvtUxnr5Yh3pxnQEvmhGUot8iBbkG8hFyYJdHd68J/nDNhuquKBQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-02T04:42:43.423843Z"},"content_sha256":"c2af63a8894089643aa8e5ec1ff49fbb2697b2009b979b8e103a77f6d18287af","schema_version":"1.0","event_id":"sha256:c2af63a8894089643aa8e5ec1ff49fbb2697b2009b979b8e103a77f6d18287af"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2018:YT35AHZZIBXXNWS6744KBRF4OS","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Metal-rich, Metal-poor: Updated Stellar Population Models for Old Stellar Systems","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.GA","authors_text":"Alexa Villaume, Charlie Conroy, Karin Lind, Pieter van Dokkum","submitted_at":"2018-01-30T19:42:39Z","abstract_excerpt":"We present updated stellar population models appropriate for old ages (>1 Gyr) and covering a wide range in metallicities (-1.5<[Fe/H]<0.3). These models predict the full spectral variation associated with individual element abundance variation as a function of metallicity and age. The models span the optical-NIR wavelength range (0.37-2.4um), include a range of initial mass functions (IMFs) and contain the flexibility to vary 18 individual elements including C, N, O, Mg, Si, Ca, Ti, and Fe. To test the fidelity of the models we fit them to integrated light optical spectra of 41 Galactic globu"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1801.10185","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":"2026-05-18T00:22:22Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"14QebbUo99UPHv9bmXCRSnIyctvMwckQvITg+HrA70+ynSK5F9ZecMXApu8xvpxRsp8AOX+IZBg8SonemVlqBQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-02T04:42:43.424197Z"},"content_sha256":"544e6e75b9e54baea892181bdedf34a776f5f1066005449a08fe3ff6fed65501","schema_version":"1.0","event_id":"sha256:544e6e75b9e54baea892181bdedf34a776f5f1066005449a08fe3ff6fed65501"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/YT35AHZZIBXXNWS6744KBRF4OS/bundle.json","state_url":"https://pith.science/pith/YT35AHZZIBXXNWS6744KBRF4OS/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/YT35AHZZIBXXNWS6744KBRF4OS/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":"2026-06-02T04:42:43Z","links":{"resolver":"https://pith.science/pith/YT35AHZZIBXXNWS6744KBRF4OS","bundle":"https://pith.science/pith/YT35AHZZIBXXNWS6744KBRF4OS/bundle.json","state":"https://pith.science/pith/YT35AHZZIBXXNWS6744KBRF4OS/state.json","well_known_bundle":"https://pith.science/.well-known/pith/YT35AHZZIBXXNWS6744KBRF4OS/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2018:YT35AHZZIBXXNWS6744KBRF4OS","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":"f141112f6f28b54b6483b7b3225166556383e923d9df79d4e7ca652344b74a7f","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2018-01-30T19:42:39Z","title_canon_sha256":"eaee07b00cdc17ebce8a954d0a102ad8b156b7a24cff82483cf311d39914c558"},"schema_version":"1.0","source":{"id":"1801.10185","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1801.10185","created_at":"2026-05-18T00:22:22Z"},{"alias_kind":"arxiv_version","alias_value":"1801.10185v1","created_at":"2026-05-18T00:22:22Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1801.10185","created_at":"2026-05-18T00:22:22Z"},{"alias_kind":"pith_short_12","alias_value":"YT35AHZZIBXX","created_at":"2026-05-18T12:33:04Z"},{"alias_kind":"pith_short_16","alias_value":"YT35AHZZIBXXNWS6","created_at":"2026-05-18T12:33:04Z"},{"alias_kind":"pith_short_8","alias_value":"YT35AHZZ","created_at":"2026-05-18T12:33:04Z"}],"graph_snapshots":[{"event_id":"sha256:544e6e75b9e54baea892181bdedf34a776f5f1066005449a08fe3ff6fed65501","target":"graph","created_at":"2026-05-18T00:22:22Z","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":"We present updated stellar population models appropriate for old ages (>1 Gyr) and covering a wide range in metallicities (-1.5<[Fe/H]<0.3). These models predict the full spectral variation associated with individual element abundance variation as a function of metallicity and age. The models span the optical-NIR wavelength range (0.37-2.4um), include a range of initial mass functions (IMFs) and contain the flexibility to vary 18 individual elements including C, N, O, Mg, Si, Ca, Ti, and Fe. To test the fidelity of the models we fit them to integrated light optical spectra of 41 Galactic globu","authors_text":"Alexa Villaume, Charlie Conroy, Karin Lind, Pieter van Dokkum","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2018-01-30T19:42:39Z","title":"Metal-rich, Metal-poor: Updated Stellar Population Models for Old Stellar Systems"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1801.10185","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:c2af63a8894089643aa8e5ec1ff49fbb2697b2009b979b8e103a77f6d18287af","target":"record","created_at":"2026-05-18T00:22:22Z","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":"f141112f6f28b54b6483b7b3225166556383e923d9df79d4e7ca652344b74a7f","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2018-01-30T19:42:39Z","title_canon_sha256":"eaee07b00cdc17ebce8a954d0a102ad8b156b7a24cff82483cf311d39914c558"},"schema_version":"1.0","source":{"id":"1801.10185","kind":"arxiv","version":1}},"canonical_sha256":"c4f7d01f39406f76da5eff38a0c4bc74bb4a720cd4f8f4215635d6e83d40b79f","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"c4f7d01f39406f76da5eff38a0c4bc74bb4a720cd4f8f4215635d6e83d40b79f","first_computed_at":"2026-05-18T00:22:22.817414Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:22:22.817414Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"t6YJujXa6U2s3isz+CfAZ3EjgA+/WIkE967ciHenHM374R/yKdrAdZzwfvDzP/EcHcIVBmZx5f7CBljFCTISAw==","signature_status":"signed_v1","signed_at":"2026-05-18T00:22:22.818116Z","signed_message":"canonical_sha256_bytes"},"source_id":"1801.10185","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:c2af63a8894089643aa8e5ec1ff49fbb2697b2009b979b8e103a77f6d18287af","sha256:544e6e75b9e54baea892181bdedf34a776f5f1066005449a08fe3ff6fed65501"],"state_sha256":"f380f9a3e1fdf58b4fc9fa27ae07d709e6eb010f671a43f8cc1941bc1ab1cd32"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"nuLBehY5eNVVFzYcnvJIvH+IEA63PsZviSOD++DL+TnAHlGwJpcfe1/R/NHZ+TDP8UfSnParOdSVfa46GQuuCA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-02T04:42:43.426259Z","bundle_sha256":"0547ebffee17b595dfc4cc4a5f9ba5d60b45ec4c97579cc73f8c133ff6c6cdbf"}}