{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2010:BBCRQ52DYVSDSHSCZGXLNJ26AA","short_pith_number":"pith:BBCRQ52D","canonical_record":{"source":{"id":"1002.3882","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2010-02-20T13:09:13Z","cross_cats_sorted":[],"title_canon_sha256":"486e85df39b2b67729496ef75c12a3e1089df1ff9d4d56a5e3fed81680596176","abstract_canon_sha256":"8a6a95934197af7e381b58bbab34876c9e586136aac31bb0a22b012e8f62d73e"},"schema_version":"1.0"},"canonical_sha256":"0845187743c564391e42c9aeb6a75e002c4ff7ce27dbff13c940a26d0c13ca56","source":{"kind":"arxiv","id":"1002.3882","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1002.3882","created_at":"2026-05-18T02:08:58Z"},{"alias_kind":"arxiv_version","alias_value":"1002.3882v1","created_at":"2026-05-18T02:08:58Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1002.3882","created_at":"2026-05-18T02:08:58Z"},{"alias_kind":"pith_short_12","alias_value":"BBCRQ52DYVSD","created_at":"2026-05-18T12:26:05Z"},{"alias_kind":"pith_short_16","alias_value":"BBCRQ52DYVSDSHSC","created_at":"2026-05-18T12:26:05Z"},{"alias_kind":"pith_short_8","alias_value":"BBCRQ52D","created_at":"2026-05-18T12:26:05Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2010:BBCRQ52DYVSDSHSCZGXLNJ26AA","target":"record","payload":{"canonical_record":{"source":{"id":"1002.3882","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2010-02-20T13:09:13Z","cross_cats_sorted":[],"title_canon_sha256":"486e85df39b2b67729496ef75c12a3e1089df1ff9d4d56a5e3fed81680596176","abstract_canon_sha256":"8a6a95934197af7e381b58bbab34876c9e586136aac31bb0a22b012e8f62d73e"},"schema_version":"1.0"},"canonical_sha256":"0845187743c564391e42c9aeb6a75e002c4ff7ce27dbff13c940a26d0c13ca56","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T02:08:58.598989Z","signature_b64":"HrKmleHXFrCXfjBZpzvXhoQ3Rf21gIH5iaJdovuShk6MQKataYEkbE6zkMB6KPyM5UyMHZkKqAqWo47WGCHmAg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"0845187743c564391e42c9aeb6a75e002c4ff7ce27dbff13c940a26d0c13ca56","last_reissued_at":"2026-05-18T02:08:58.598180Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T02:08:58.598180Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1002.3882","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":"2026-05-18T02:08:58Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"GxIZ/75kyZ3zIl9n9/vZ7YtY2MkmjYsW58oCCutI29pdVg3d7FEu3A/QeP+WSzVczwzv0R7e07x3V4ipl0pDAA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-10T00:36:53.310450Z"},"content_sha256":"6a1d1ab48fe75e7f7591db8ce9143042997dfcf17ba94d2a00f8027e76bb6a16","schema_version":"1.0","event_id":"sha256:6a1d1ab48fe75e7f7591db8ce9143042997dfcf17ba94d2a00f8027e76bb6a16"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2010:BBCRQ52DYVSDSHSCZGXLNJ26AA","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Modelling the chemical evolution","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.CO","authors_text":"Gerhard Hensler, Simone Recchi (Institute of Astronomy, University of Vienna)","submitted_at":"2010-02-20T13:09:13Z","abstract_excerpt":"Advanced observational facilities allow to trace back the chemical evolution of the Universe, on the one hand, from local objects of different ages and, secondly, by direct observations of redshifted objects. The chemical enrichment serves as one of the cornerstones of cosmological evolution. In order to understand this chemical evolution in morphologically different astrophysical objects models are constructed based on analytical descriptions or numerical methods. For the comparison of their chemical issues, as there are element abundances, gradients, and ratios, with observations not only th"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1002.3882","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":"2026-05-18T02:08:58Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"UoK4RzgALNsyKQyYRA3aeA3LlKqzoMNkqXOnDvcrComrGGM5Hf/hWODi0dHUwNFzAQiqaao4/MxOzuS9+TzjDQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-10T00:36:53.311189Z"},"content_sha256":"93ebba7d22b92bf46ce6b29535eae518cfaf15db45664bfba249c312cad8db71","schema_version":"1.0","event_id":"sha256:93ebba7d22b92bf46ce6b29535eae518cfaf15db45664bfba249c312cad8db71"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/BBCRQ52DYVSDSHSCZGXLNJ26AA/bundle.json","state_url":"https://pith.science/pith/BBCRQ52DYVSDSHSCZGXLNJ26AA/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/BBCRQ52DYVSDSHSCZGXLNJ26AA/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":"2026-06-10T00:36:53Z","links":{"resolver":"https://pith.science/pith/BBCRQ52DYVSDSHSCZGXLNJ26AA","bundle":"https://pith.science/pith/BBCRQ52DYVSDSHSCZGXLNJ26AA/bundle.json","state":"https://pith.science/pith/BBCRQ52DYVSDSHSCZGXLNJ26AA/state.json","well_known_bundle":"https://pith.science/.well-known/pith/BBCRQ52DYVSDSHSCZGXLNJ26AA/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2010:BBCRQ52DYVSDSHSCZGXLNJ26AA","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":"8a6a95934197af7e381b58bbab34876c9e586136aac31bb0a22b012e8f62d73e","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2010-02-20T13:09:13Z","title_canon_sha256":"486e85df39b2b67729496ef75c12a3e1089df1ff9d4d56a5e3fed81680596176"},"schema_version":"1.0","source":{"id":"1002.3882","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1002.3882","created_at":"2026-05-18T02:08:58Z"},{"alias_kind":"arxiv_version","alias_value":"1002.3882v1","created_at":"2026-05-18T02:08:58Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1002.3882","created_at":"2026-05-18T02:08:58Z"},{"alias_kind":"pith_short_12","alias_value":"BBCRQ52DYVSD","created_at":"2026-05-18T12:26:05Z"},{"alias_kind":"pith_short_16","alias_value":"BBCRQ52DYVSDSHSC","created_at":"2026-05-18T12:26:05Z"},{"alias_kind":"pith_short_8","alias_value":"BBCRQ52D","created_at":"2026-05-18T12:26:05Z"}],"graph_snapshots":[{"event_id":"sha256:93ebba7d22b92bf46ce6b29535eae518cfaf15db45664bfba249c312cad8db71","target":"graph","created_at":"2026-05-18T02:08:58Z","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":"Advanced observational facilities allow to trace back the chemical evolution of the Universe, on the one hand, from local objects of different ages and, secondly, by direct observations of redshifted objects. The chemical enrichment serves as one of the cornerstones of cosmological evolution. In order to understand this chemical evolution in morphologically different astrophysical objects models are constructed based on analytical descriptions or numerical methods. For the comparison of their chemical issues, as there are element abundances, gradients, and ratios, with observations not only th","authors_text":"Gerhard Hensler, Simone Recchi (Institute of Astronomy, University of Vienna)","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2010-02-20T13:09:13Z","title":"Modelling the chemical evolution"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1002.3882","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":"sha256:6a1d1ab48fe75e7f7591db8ce9143042997dfcf17ba94d2a00f8027e76bb6a16","target":"record","created_at":"2026-05-18T02:08:58Z","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":"8a6a95934197af7e381b58bbab34876c9e586136aac31bb0a22b012e8f62d73e","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2010-02-20T13:09:13Z","title_canon_sha256":"486e85df39b2b67729496ef75c12a3e1089df1ff9d4d56a5e3fed81680596176"},"schema_version":"1.0","source":{"id":"1002.3882","kind":"arxiv","version":1}},"canonical_sha256":"0845187743c564391e42c9aeb6a75e002c4ff7ce27dbff13c940a26d0c13ca56","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"0845187743c564391e42c9aeb6a75e002c4ff7ce27dbff13c940a26d0c13ca56","first_computed_at":"2026-05-18T02:08:58.598180Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T02:08:58.598180Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"HrKmleHXFrCXfjBZpzvXhoQ3Rf21gIH5iaJdovuShk6MQKataYEkbE6zkMB6KPyM5UyMHZkKqAqWo47WGCHmAg==","signature_status":"signed_v1","signed_at":"2026-05-18T02:08:58.598989Z","signed_message":"canonical_sha256_bytes"},"source_id":"1002.3882","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:6a1d1ab48fe75e7f7591db8ce9143042997dfcf17ba94d2a00f8027e76bb6a16","sha256:93ebba7d22b92bf46ce6b29535eae518cfaf15db45664bfba249c312cad8db71"],"state_sha256":"c5cf826819b1d98ff7b922c601bb73a444f42d9a2f1e1df08c3481d76ab1347c"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"CYuOO2PmV9yt8VvnWuoNiHbJbfoDE2fwJ+tiiMzt3QkshsahjXIztAkfhDmtn9tL2MqLky6gLXjXUWbg27H4CQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-10T00:36:53.315032Z","bundle_sha256":"1d30e7e0c06e46a2bd1118c20686755ff6d9f8dd6d949dc56562d8d70826c4dd"}}