{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2009:74IWYC7RRCIY5SFJIN6FX4VUC4","short_pith_number":"pith:74IWYC7R","canonical_record":{"source":{"id":"0910.4961","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2009-10-26T20:00:10Z","cross_cats_sorted":[],"title_canon_sha256":"e421699f7e80716fc6da7c9930fd183158c597f2bbc93b240646a6ce9d20aecb","abstract_canon_sha256":"03af32d74989312873c1bc2080a46c8a8562f83437f8c486e38bfe6755362640"},"schema_version":"1.0"},"canonical_sha256":"ff116c0bf188918ec8a9437c5bf2b4173cbcdbea58d12df219dce50942af9453","source":{"kind":"arxiv","id":"0910.4961","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"0910.4961","created_at":"2026-05-18T02:11:11Z"},{"alias_kind":"arxiv_version","alias_value":"0910.4961v2","created_at":"2026-05-18T02:11:11Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.0910.4961","created_at":"2026-05-18T02:11:11Z"},{"alias_kind":"pith_short_12","alias_value":"74IWYC7RRCIY","created_at":"2026-05-18T12:25:58Z"},{"alias_kind":"pith_short_16","alias_value":"74IWYC7RRCIY5SFJ","created_at":"2026-05-18T12:25:58Z"},{"alias_kind":"pith_short_8","alias_value":"74IWYC7R","created_at":"2026-05-18T12:25:58Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2009:74IWYC7RRCIY5SFJIN6FX4VUC4","target":"record","payload":{"canonical_record":{"source":{"id":"0910.4961","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2009-10-26T20:00:10Z","cross_cats_sorted":[],"title_canon_sha256":"e421699f7e80716fc6da7c9930fd183158c597f2bbc93b240646a6ce9d20aecb","abstract_canon_sha256":"03af32d74989312873c1bc2080a46c8a8562f83437f8c486e38bfe6755362640"},"schema_version":"1.0"},"canonical_sha256":"ff116c0bf188918ec8a9437c5bf2b4173cbcdbea58d12df219dce50942af9453","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T02:11:11.265144Z","signature_b64":"h95/40PQzWFnL+r+V5keiYlEU/c9wBWe2GsoXpqKoh8F8oEqpdG0oohPS9oEyHtEthA2NaKPwSWlDQ/p8WxpDw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"ff116c0bf188918ec8a9437c5bf2b4173cbcdbea58d12df219dce50942af9453","last_reissued_at":"2026-05-18T02:11:11.264373Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T02:11:11.264373Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"0910.4961","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":"2026-05-18T02:11:11Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"HaLNT+nRpVOTTiNKTggygBORA+j/u80U9+E8HO0tg9vR8AH47rKTx+TmzPsBGYDj9J7dN0zqS25CXgzgDQn8BA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-26T23:17:29.899584Z"},"content_sha256":"5c8fe0cbbac4f4bbfa0bb40c6b00ce5ab03207bb09f02eb80907701d8a717d5f","schema_version":"1.0","event_id":"sha256:5c8fe0cbbac4f4bbfa0bb40c6b00ce5ab03207bb09f02eb80907701d8a717d5f"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2009:74IWYC7RRCIY5SFJIN6FX4VUC4","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"The Deuterium Abundance in the Local Interstellar Medium","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.GA","authors_text":"Brian D. Fields, Gary Steigman, Tijana Prodanovic","submitted_at":"2009-10-26T20:00:10Z","abstract_excerpt":"As the Galaxy evolves, the abundance of deuterium in the interstellar medium (ISM) decreases from its primordial value: deuterium is \"astrated\".  The deuterium astration factor, f_D, the ratio of the primordial D abundance (the D to H ratio by number) to the ISM D abundance, is determined by the competition between stellar destruction and infall, providing a constraint on models of the chemical evolution of the Galaxy.  Although conventional wisdom suggests that the local ISM (i.e., within ~1-2 kpc of the Sun) should be well mixed and homogenized on timescales short compared to the chemical ev"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0910.4961","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":"2026-05-18T02:11:11Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"DI+qMRIseG7lgg+tWFuS2FcMB4IX+7YMZI0FysfGC+uDUfuyVs6u3kqKLIl3rGyqh/JwrAyQXPmDrNemVuoSCQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-26T23:17:29.900194Z"},"content_sha256":"5c86d0ed4c73b36b2b2750210a2961b82f31bcf747747312294f8bdd7318d739","schema_version":"1.0","event_id":"sha256:5c86d0ed4c73b36b2b2750210a2961b82f31bcf747747312294f8bdd7318d739"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/74IWYC7RRCIY5SFJIN6FX4VUC4/bundle.json","state_url":"https://pith.science/pith/74IWYC7RRCIY5SFJIN6FX4VUC4/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/74IWYC7RRCIY5SFJIN6FX4VUC4/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":"2026-05-26T23:17:29Z","links":{"resolver":"https://pith.science/pith/74IWYC7RRCIY5SFJIN6FX4VUC4","bundle":"https://pith.science/pith/74IWYC7RRCIY5SFJIN6FX4VUC4/bundle.json","state":"https://pith.science/pith/74IWYC7RRCIY5SFJIN6FX4VUC4/state.json","well_known_bundle":"https://pith.science/.well-known/pith/74IWYC7RRCIY5SFJIN6FX4VUC4/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2009:74IWYC7RRCIY5SFJIN6FX4VUC4","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":"03af32d74989312873c1bc2080a46c8a8562f83437f8c486e38bfe6755362640","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2009-10-26T20:00:10Z","title_canon_sha256":"e421699f7e80716fc6da7c9930fd183158c597f2bbc93b240646a6ce9d20aecb"},"schema_version":"1.0","source":{"id":"0910.4961","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"0910.4961","created_at":"2026-05-18T02:11:11Z"},{"alias_kind":"arxiv_version","alias_value":"0910.4961v2","created_at":"2026-05-18T02:11:11Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.0910.4961","created_at":"2026-05-18T02:11:11Z"},{"alias_kind":"pith_short_12","alias_value":"74IWYC7RRCIY","created_at":"2026-05-18T12:25:58Z"},{"alias_kind":"pith_short_16","alias_value":"74IWYC7RRCIY5SFJ","created_at":"2026-05-18T12:25:58Z"},{"alias_kind":"pith_short_8","alias_value":"74IWYC7R","created_at":"2026-05-18T12:25:58Z"}],"graph_snapshots":[{"event_id":"sha256:5c86d0ed4c73b36b2b2750210a2961b82f31bcf747747312294f8bdd7318d739","target":"graph","created_at":"2026-05-18T02:11:11Z","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":"As the Galaxy evolves, the abundance of deuterium in the interstellar medium (ISM) decreases from its primordial value: deuterium is \"astrated\".  The deuterium astration factor, f_D, the ratio of the primordial D abundance (the D to H ratio by number) to the ISM D abundance, is determined by the competition between stellar destruction and infall, providing a constraint on models of the chemical evolution of the Galaxy.  Although conventional wisdom suggests that the local ISM (i.e., within ~1-2 kpc of the Sun) should be well mixed and homogenized on timescales short compared to the chemical ev","authors_text":"Brian D. Fields, Gary Steigman, Tijana Prodanovic","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2009-10-26T20:00:10Z","title":"The Deuterium Abundance in the Local Interstellar Medium"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0910.4961","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":"sha256:5c8fe0cbbac4f4bbfa0bb40c6b00ce5ab03207bb09f02eb80907701d8a717d5f","target":"record","created_at":"2026-05-18T02:11:11Z","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":"03af32d74989312873c1bc2080a46c8a8562f83437f8c486e38bfe6755362640","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2009-10-26T20:00:10Z","title_canon_sha256":"e421699f7e80716fc6da7c9930fd183158c597f2bbc93b240646a6ce9d20aecb"},"schema_version":"1.0","source":{"id":"0910.4961","kind":"arxiv","version":2}},"canonical_sha256":"ff116c0bf188918ec8a9437c5bf2b4173cbcdbea58d12df219dce50942af9453","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"ff116c0bf188918ec8a9437c5bf2b4173cbcdbea58d12df219dce50942af9453","first_computed_at":"2026-05-18T02:11:11.264373Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T02:11:11.264373Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"h95/40PQzWFnL+r+V5keiYlEU/c9wBWe2GsoXpqKoh8F8oEqpdG0oohPS9oEyHtEthA2NaKPwSWlDQ/p8WxpDw==","signature_status":"signed_v1","signed_at":"2026-05-18T02:11:11.265144Z","signed_message":"canonical_sha256_bytes"},"source_id":"0910.4961","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:5c8fe0cbbac4f4bbfa0bb40c6b00ce5ab03207bb09f02eb80907701d8a717d5f","sha256:5c86d0ed4c73b36b2b2750210a2961b82f31bcf747747312294f8bdd7318d739"],"state_sha256":"94c3d43c88a465fa8593ac5c202e0985f582149b13cc8ca83d3034662c89069c"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"sPp4uStyAh8Z9ESS7baLha2MXzLXGDaz95L/fx0j+L8AuvcYKYBAQQfp17GGvFEyUwnuNzqP9Kf09mBq+PIFBQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-26T23:17:29.903704Z","bundle_sha256":"4251b1474e641c207b8aa0e107ebcc30a8aa0e6bcfb08a9458a2a6eaf28d669e"}}