{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2019:A56UXNV2BTEDAJVILCHW4II55H","short_pith_number":"pith:A56UXNV2","canonical_record":{"source":{"id":"1908.10571","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2019-08-28T06:56:07Z","cross_cats_sorted":[],"title_canon_sha256":"14ccc52cf602303e4eed41bea206d4515868426310c5528aff06c4d63ed01551","abstract_canon_sha256":"fde50249285dafbf198dec5908f9b0a3e162dbf5cfb905179848315cce25870b"},"schema_version":"1.0"},"canonical_sha256":"077d4bb6ba0cc83026a8588f6e211de9fbd5e0cf3906882f9ed473168a954a7a","source":{"kind":"arxiv","id":"1908.10571","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1908.10571","created_at":"2026-07-05T00:06:55Z"},{"alias_kind":"arxiv_version","alias_value":"1908.10571v2","created_at":"2026-07-05T00:06:55Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1908.10571","created_at":"2026-07-05T00:06:55Z"},{"alias_kind":"pith_short_12","alias_value":"A56UXNV2BTED","created_at":"2026-07-05T00:06:55Z"},{"alias_kind":"pith_short_16","alias_value":"A56UXNV2BTEDAJVI","created_at":"2026-07-05T00:06:55Z"},{"alias_kind":"pith_short_8","alias_value":"A56UXNV2","created_at":"2026-07-05T00:06:55Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2019:A56UXNV2BTEDAJVILCHW4II55H","target":"record","payload":{"canonical_record":{"source":{"id":"1908.10571","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2019-08-28T06:56:07Z","cross_cats_sorted":[],"title_canon_sha256":"14ccc52cf602303e4eed41bea206d4515868426310c5528aff06c4d63ed01551","abstract_canon_sha256":"fde50249285dafbf198dec5908f9b0a3e162dbf5cfb905179848315cce25870b"},"schema_version":"1.0"},"canonical_sha256":"077d4bb6ba0cc83026a8588f6e211de9fbd5e0cf3906882f9ed473168a954a7a","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T00:06:55.978889Z","signature_b64":"9GxXeXNzyUs3qsZ9015XsPEAdD5Qyc2N4387p1IUrHlEU8GmXy+6nL3cxbF5JptxcLZYluiQ4qKGJv/76AFADw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"077d4bb6ba0cc83026a8588f6e211de9fbd5e0cf3906882f9ed473168a954a7a","last_reissued_at":"2026-07-05T00:06:55.978364Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T00:06:55.978364Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1908.10571","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":"2026-07-05T00:06:55Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"Etg7mjvP7fAJoO7clnDkh2MOnNnJY5JwX9RecRa0DQc+0RrKsG1bers0xq1TNYlkBn6TzRmFGfk/BuQETvMMCg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-21T23:04:04.320997Z"},"content_sha256":"43874b3308467543efe78276407161771055f074983b12e47b4159643d10d8eb","schema_version":"1.0","event_id":"sha256:43874b3308467543efe78276407161771055f074983b12e47b4159643d10d8eb"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2019:A56UXNV2BTEDAJVILCHW4II55H","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"2D-Galactic chemical evolution: the role of the spiral density wave","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.GA","authors_text":"\\'A I. D\\'iaz, Bradley K. Gibson, Dismas S. Wamalwa, Fernando. F. Rosales-Ortega, Mercedes Moll\\'a, Oscar Cavichia, Sebastian F. S\\'anchez, Sheillah Wekesa, Yago Ascasibar","submitted_at":"2019-08-28T06:56:07Z","abstract_excerpt":"We present a 2-dimensional chemical evolution code applied to a Milky Way type galaxy, incorporating the role of spiral arms in shaping azimuthal abundance variations, and confront the predicted behaviour with recent observations taken with integral field units. To the usual radial distribution of mass, we add the surface density of the spiral wave and study its effect on star formation and elemental abundances. We compute five different models: one with azimuthal symmetry which depends only on radius, while the other four are subjected to the effect of a spiral density wave. At early times, t"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1908.10571","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":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/1908.10571/integrity.json","findings":[],"available":true,"detectors_run":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938"},"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":"2026-07-05T00:06:55Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"RNPA0ddYwz59wExj2vNMNqtlhq6+WfBtzNoTD23CRptrQXqQB+dybq9M4PkANxfRuu3dnR1cGjptX7XzYrzYBA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-21T23:04:04.322182Z"},"content_sha256":"42b4c3e4e182a81a1e55d23e9b32523fbc39e72756d7eade58b005ad8bc042f1","schema_version":"1.0","event_id":"sha256:42b4c3e4e182a81a1e55d23e9b32523fbc39e72756d7eade58b005ad8bc042f1"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/A56UXNV2BTEDAJVILCHW4II55H/bundle.json","state_url":"https://pith.science/pith/A56UXNV2BTEDAJVILCHW4II55H/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/A56UXNV2BTEDAJVILCHW4II55H/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":"2026-08-21T23:04:04Z","links":{"resolver":"https://pith.science/pith/A56UXNV2BTEDAJVILCHW4II55H","bundle":"https://pith.science/pith/A56UXNV2BTEDAJVILCHW4II55H/bundle.json","state":"https://pith.science/pith/A56UXNV2BTEDAJVILCHW4II55H/state.json","well_known_bundle":"https://pith.science/.well-known/pith/A56UXNV2BTEDAJVILCHW4II55H/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2019:A56UXNV2BTEDAJVILCHW4II55H","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":"fde50249285dafbf198dec5908f9b0a3e162dbf5cfb905179848315cce25870b","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2019-08-28T06:56:07Z","title_canon_sha256":"14ccc52cf602303e4eed41bea206d4515868426310c5528aff06c4d63ed01551"},"schema_version":"1.0","source":{"id":"1908.10571","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1908.10571","created_at":"2026-07-05T00:06:55Z"},{"alias_kind":"arxiv_version","alias_value":"1908.10571v2","created_at":"2026-07-05T00:06:55Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1908.10571","created_at":"2026-07-05T00:06:55Z"},{"alias_kind":"pith_short_12","alias_value":"A56UXNV2BTED","created_at":"2026-07-05T00:06:55Z"},{"alias_kind":"pith_short_16","alias_value":"A56UXNV2BTEDAJVI","created_at":"2026-07-05T00:06:55Z"},{"alias_kind":"pith_short_8","alias_value":"A56UXNV2","created_at":"2026-07-05T00:06:55Z"}],"graph_snapshots":[{"event_id":"sha256:42b4c3e4e182a81a1e55d23e9b32523fbc39e72756d7eade58b005ad8bc042f1","target":"graph","created_at":"2026-07-05T00:06:55Z","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"},"integrity":{"available":true,"clean":true,"detectors_run":[],"endpoint":"/pith/1908.10571/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"We present a 2-dimensional chemical evolution code applied to a Milky Way type galaxy, incorporating the role of spiral arms in shaping azimuthal abundance variations, and confront the predicted behaviour with recent observations taken with integral field units. To the usual radial distribution of mass, we add the surface density of the spiral wave and study its effect on star formation and elemental abundances. We compute five different models: one with azimuthal symmetry which depends only on radius, while the other four are subjected to the effect of a spiral density wave. At early times, t","authors_text":"\\'A I. D\\'iaz, Bradley K. Gibson, Dismas S. Wamalwa, Fernando. F. Rosales-Ortega, Mercedes Moll\\'a, Oscar Cavichia, Sebastian F. S\\'anchez, Sheillah Wekesa, Yago Ascasibar","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2019-08-28T06:56:07Z","title":"2D-Galactic chemical evolution: the role of the spiral density wave"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1908.10571","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":"sha256:43874b3308467543efe78276407161771055f074983b12e47b4159643d10d8eb","target":"record","created_at":"2026-07-05T00:06:55Z","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":"fde50249285dafbf198dec5908f9b0a3e162dbf5cfb905179848315cce25870b","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2019-08-28T06:56:07Z","title_canon_sha256":"14ccc52cf602303e4eed41bea206d4515868426310c5528aff06c4d63ed01551"},"schema_version":"1.0","source":{"id":"1908.10571","kind":"arxiv","version":2}},"canonical_sha256":"077d4bb6ba0cc83026a8588f6e211de9fbd5e0cf3906882f9ed473168a954a7a","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"077d4bb6ba0cc83026a8588f6e211de9fbd5e0cf3906882f9ed473168a954a7a","first_computed_at":"2026-07-05T00:06:55.978364Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T00:06:55.978364Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"9GxXeXNzyUs3qsZ9015XsPEAdD5Qyc2N4387p1IUrHlEU8GmXy+6nL3cxbF5JptxcLZYluiQ4qKGJv/76AFADw==","signature_status":"signed_v1","signed_at":"2026-07-05T00:06:55.978889Z","signed_message":"canonical_sha256_bytes"},"source_id":"1908.10571","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:43874b3308467543efe78276407161771055f074983b12e47b4159643d10d8eb","sha256:42b4c3e4e182a81a1e55d23e9b32523fbc39e72756d7eade58b005ad8bc042f1"],"state_sha256":"798875807b46953451045f56801f04fd79208769a42698540e40f45811a3e204"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"v6b3zjPrtAYJ/wWyj9ZI+8nS8LJ/TNw3ZCEzenHLZvcXbGrnP2BsuaJGxSxpaw4v/MqC8T9U2vpf0fVYhKN0Aw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-21T23:04:04.331590Z","bundle_sha256":"f5eed68d7945fb07e441582fb9319eb73e6dbbf9cf8d48f72a7e306ed2372002"}}