{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2008:GXF75HF7JJEDYS7YYNBOITENYC","short_pith_number":"pith:GXF75HF7","canonical_record":{"source":{"id":"0809.3006","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph","submitted_at":"2008-09-17T20:35:06Z","cross_cats_sorted":[],"title_canon_sha256":"e38ea2def9ede337e23050625350e4c9e72f3a2e4b947857ce07549a632b6336","abstract_canon_sha256":"54c2238ea7cae9529a5f0bab77fb621f967f754d5b9fac4cf4f4acbf0dc34bdd"},"schema_version":"1.0"},"canonical_sha256":"35cbfe9cbf4a483c4bf8c342e44c8dc0882cf83e1bba8d6cfe458e391e54f202","source":{"kind":"arxiv","id":"0809.3006","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"0809.3006","created_at":"2026-05-18T02:15:34Z"},{"alias_kind":"arxiv_version","alias_value":"0809.3006v2","created_at":"2026-05-18T02:15:34Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.0809.3006","created_at":"2026-05-18T02:15:34Z"},{"alias_kind":"pith_short_12","alias_value":"GXF75HF7JJED","created_at":"2026-05-18T12:25:57Z"},{"alias_kind":"pith_short_16","alias_value":"GXF75HF7JJEDYS7Y","created_at":"2026-05-18T12:25:57Z"},{"alias_kind":"pith_short_8","alias_value":"GXF75HF7","created_at":"2026-05-18T12:25:57Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2008:GXF75HF7JJEDYS7YYNBOITENYC","target":"record","payload":{"canonical_record":{"source":{"id":"0809.3006","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph","submitted_at":"2008-09-17T20:35:06Z","cross_cats_sorted":[],"title_canon_sha256":"e38ea2def9ede337e23050625350e4c9e72f3a2e4b947857ce07549a632b6336","abstract_canon_sha256":"54c2238ea7cae9529a5f0bab77fb621f967f754d5b9fac4cf4f4acbf0dc34bdd"},"schema_version":"1.0"},"canonical_sha256":"35cbfe9cbf4a483c4bf8c342e44c8dc0882cf83e1bba8d6cfe458e391e54f202","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T02:15:34.423704Z","signature_b64":"sv+kfm7iKIVCmwB/wplsh7hb0dzP9WaY4yLauZoGHbFia8vZuR1+N1NACXhSJGCz7nYZhV+W5N5yiUUTSFS0Cg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"35cbfe9cbf4a483c4bf8c342e44c8dc0882cf83e1bba8d6cfe458e391e54f202","last_reissued_at":"2026-05-18T02:15:34.422959Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T02:15:34.422959Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"0809.3006","source_version":2,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T02:15:34Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"NKMrk1eoYauocGQteBFD+gIoLnKs5lFacV3qOahmCEigdmOO6c+JgH+NTtI1qsl/JurhINtYkis6Di1xzNKNCA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-31T06:12:19.556007Z"},"content_sha256":"b2bbd1125140e1c55c27cea9051e7037bf20c842df7204063786f699ba178b57","schema_version":"1.0","event_id":"sha256:b2bbd1125140e1c55c27cea9051e7037bf20c842df7204063786f699ba178b57"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2008:GXF75HF7JJEDYS7YYNBOITENYC","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Chemical evolution with radial mixing","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph","authors_text":"James Binney, Ralph Schoenrich","submitted_at":"2008-09-17T20:35:06Z","abstract_excerpt":"Models of the chemical evolution of our Galaxy are extended to include radial migration of stars and flow of gas through the disc. The models track the production of both iron and alpha elements. A model is chosen that provides an excellent fit to the metallicity distribution of stars in the Geneva-Copenhagen survey (GCS) of the solar neighbourhood, and a good fit to the local Hess diagram. The model provides a good fit to the distribution of GCS stars in the age-metallicity plane although this plane was not used in the fitting process. Although this model's star-formation rate is monotonic de"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0809.3006","kind":"arxiv","version":2},"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":"2026-05-18T02:15:34Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"pcHbXH/0NJi2u5oBbeLTHwnIJ5cHqGhTNJtsMOvTMwTznRFlmywCYeZnnTVARRVozqbXGmlP0wo5pIrDa+RjBQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-31T06:12:19.556389Z"},"content_sha256":"b3a8c7d8f1c877653e7caaf6da213a45050bf0ca84bb534247417f403ff78003","schema_version":"1.0","event_id":"sha256:b3a8c7d8f1c877653e7caaf6da213a45050bf0ca84bb534247417f403ff78003"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/GXF75HF7JJEDYS7YYNBOITENYC/bundle.json","state_url":"https://pith.science/pith/GXF75HF7JJEDYS7YYNBOITENYC/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/GXF75HF7JJEDYS7YYNBOITENYC/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":"2026-05-31T06:12:19Z","links":{"resolver":"https://pith.science/pith/GXF75HF7JJEDYS7YYNBOITENYC","bundle":"https://pith.science/pith/GXF75HF7JJEDYS7YYNBOITENYC/bundle.json","state":"https://pith.science/pith/GXF75HF7JJEDYS7YYNBOITENYC/state.json","well_known_bundle":"https://pith.science/.well-known/pith/GXF75HF7JJEDYS7YYNBOITENYC/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2008:GXF75HF7JJEDYS7YYNBOITENYC","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":"54c2238ea7cae9529a5f0bab77fb621f967f754d5b9fac4cf4f4acbf0dc34bdd","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph","submitted_at":"2008-09-17T20:35:06Z","title_canon_sha256":"e38ea2def9ede337e23050625350e4c9e72f3a2e4b947857ce07549a632b6336"},"schema_version":"1.0","source":{"id":"0809.3006","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"0809.3006","created_at":"2026-05-18T02:15:34Z"},{"alias_kind":"arxiv_version","alias_value":"0809.3006v2","created_at":"2026-05-18T02:15:34Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.0809.3006","created_at":"2026-05-18T02:15:34Z"},{"alias_kind":"pith_short_12","alias_value":"GXF75HF7JJED","created_at":"2026-05-18T12:25:57Z"},{"alias_kind":"pith_short_16","alias_value":"GXF75HF7JJEDYS7Y","created_at":"2026-05-18T12:25:57Z"},{"alias_kind":"pith_short_8","alias_value":"GXF75HF7","created_at":"2026-05-18T12:25:57Z"}],"graph_snapshots":[{"event_id":"sha256:b3a8c7d8f1c877653e7caaf6da213a45050bf0ca84bb534247417f403ff78003","target":"graph","created_at":"2026-05-18T02:15:34Z","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":"Models of the chemical evolution of our Galaxy are extended to include radial migration of stars and flow of gas through the disc. The models track the production of both iron and alpha elements. A model is chosen that provides an excellent fit to the metallicity distribution of stars in the Geneva-Copenhagen survey (GCS) of the solar neighbourhood, and a good fit to the local Hess diagram. The model provides a good fit to the distribution of GCS stars in the age-metallicity plane although this plane was not used in the fitting process. Although this model's star-formation rate is monotonic de","authors_text":"James Binney, Ralph Schoenrich","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph","submitted_at":"2008-09-17T20:35:06Z","title":"Chemical evolution with radial mixing"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0809.3006","kind":"arxiv","version":2},"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:b2bbd1125140e1c55c27cea9051e7037bf20c842df7204063786f699ba178b57","target":"record","created_at":"2026-05-18T02:15:34Z","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":"54c2238ea7cae9529a5f0bab77fb621f967f754d5b9fac4cf4f4acbf0dc34bdd","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph","submitted_at":"2008-09-17T20:35:06Z","title_canon_sha256":"e38ea2def9ede337e23050625350e4c9e72f3a2e4b947857ce07549a632b6336"},"schema_version":"1.0","source":{"id":"0809.3006","kind":"arxiv","version":2}},"canonical_sha256":"35cbfe9cbf4a483c4bf8c342e44c8dc0882cf83e1bba8d6cfe458e391e54f202","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"35cbfe9cbf4a483c4bf8c342e44c8dc0882cf83e1bba8d6cfe458e391e54f202","first_computed_at":"2026-05-18T02:15:34.422959Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T02:15:34.422959Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"sv+kfm7iKIVCmwB/wplsh7hb0dzP9WaY4yLauZoGHbFia8vZuR1+N1NACXhSJGCz7nYZhV+W5N5yiUUTSFS0Cg==","signature_status":"signed_v1","signed_at":"2026-05-18T02:15:34.423704Z","signed_message":"canonical_sha256_bytes"},"source_id":"0809.3006","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:b2bbd1125140e1c55c27cea9051e7037bf20c842df7204063786f699ba178b57","sha256:b3a8c7d8f1c877653e7caaf6da213a45050bf0ca84bb534247417f403ff78003"],"state_sha256":"0fab8b01b97fb33ccc0c81314a9dd7a538d825a7f49f883598b97045462e1c01"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"fkLI/Mi9OyXHR+jMmcVLLCsEOstadT7YPAbU9rA+SeV0K9itzODnH6jgf37kyBhGEccPByxlvipjMRhg7mUGBA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-31T06:12:19.559605Z","bundle_sha256":"af02fdfd7062f7e1f6182d72b835c2ae14a9427578b317ee630d867d33e48999"}}