{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2012:O7WNVEYANZT7ISFQPO6ID6KSSC","short_pith_number":"pith:O7WNVEYA","canonical_record":{"source":{"id":"1209.2240","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2012-09-11T06:43:09Z","cross_cats_sorted":["astro-ph.GA"],"title_canon_sha256":"78db4933fd7938a00aab6c0b75bba5e04c1dc515804c50cd4aae33661144d368","abstract_canon_sha256":"adb2e01c74caa7409f825b5fc798de2fc689e58f4d8fd9fede1d5f39e9168030"},"schema_version":"1.0"},"canonical_sha256":"77ecda93006e67f448b07bbc81f95290b0e27b26301218e800149d9dff8a854f","source":{"kind":"arxiv","id":"1209.2240","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1209.2240","created_at":"2026-05-18T01:54:30Z"},{"alias_kind":"arxiv_version","alias_value":"1209.2240v1","created_at":"2026-05-18T01:54:30Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1209.2240","created_at":"2026-05-18T01:54:30Z"},{"alias_kind":"pith_short_12","alias_value":"O7WNVEYANZT7","created_at":"2026-05-18T12:27:16Z"},{"alias_kind":"pith_short_16","alias_value":"O7WNVEYANZT7ISFQ","created_at":"2026-05-18T12:27:16Z"},{"alias_kind":"pith_short_8","alias_value":"O7WNVEYA","created_at":"2026-05-18T12:27:16Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2012:O7WNVEYANZT7ISFQPO6ID6KSSC","target":"record","payload":{"canonical_record":{"source":{"id":"1209.2240","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2012-09-11T06:43:09Z","cross_cats_sorted":["astro-ph.GA"],"title_canon_sha256":"78db4933fd7938a00aab6c0b75bba5e04c1dc515804c50cd4aae33661144d368","abstract_canon_sha256":"adb2e01c74caa7409f825b5fc798de2fc689e58f4d8fd9fede1d5f39e9168030"},"schema_version":"1.0"},"canonical_sha256":"77ecda93006e67f448b07bbc81f95290b0e27b26301218e800149d9dff8a854f","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:54:30.704288Z","signature_b64":"Gck+e/HFWLa4C76981pFuQ3wra3IIxbhQ0aOhz8WdywleejMmHq0/qWQYNyVvj2VtNIko9GKIvZeFym2oEKgBQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"77ecda93006e67f448b07bbc81f95290b0e27b26301218e800149d9dff8a854f","last_reissued_at":"2026-05-18T01:54:30.703717Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:54:30.703717Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1209.2240","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":"2026-05-18T01:54:30Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"qHdDm6S/0637HdO3dLRrDVZIu+U6AI4pIfxl0JO1z0jfFpAtFU+dFWAIOQ4ob6AO5RRZNpa8qSEwfw0jQTAXBg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-19T18:18:36.185202Z"},"content_sha256":"0306189b90fd2f47fcc37ddc99e9fba9121bf3388eccced6d92381a60b824867","schema_version":"1.0","event_id":"sha256:0306189b90fd2f47fcc37ddc99e9fba9121bf3388eccced6d92381a60b824867"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2012:O7WNVEYANZT7ISFQPO6ID6KSSC","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Can Galactic chemical evolution explain the oxygen isotopic variations in the Solar System?","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.GA"],"primary_cat":"astro-ph.SR","authors_text":"Kurt Liffman, Maria Lugaro, Sarah T. Maddison, Trevor R. Ireland","submitted_at":"2012-09-11T06:43:09Z","abstract_excerpt":"A number of objects in primitive meteorites have oxygen isotopic compositions that place them on a distinct, mass-independent fractionation line with a slope of one on a three-isotope plot. The most popular model for describing how this fractionation arose assumes that CO self-shielding produced 16O-rich CO and 16O-poor H2O, where the H2O subsequently combined with interstellar dust to form relatively 16O-poor solids within the Solar Nebula. Another model for creating the different reservoirs of 16O-rich gas and 16O-poor solids suggests that these reservoirs were produced by Galactic chemical "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1209.2240","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":"2026-05-18T01:54:30Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"IWEsrq6Wt1cdLIrM4Igxy+i53tqa5bzBhT2jtA38bX4XS/PjvkbHpPC26h+NCjxTxUNZJC+sP5A/9RL1OQ4sBQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-19T18:18:36.185566Z"},"content_sha256":"652b6f0203cec4f8b98daaa3d2a08dd73fd76b9c0eaa7829537f8637b525d54a","schema_version":"1.0","event_id":"sha256:652b6f0203cec4f8b98daaa3d2a08dd73fd76b9c0eaa7829537f8637b525d54a"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/O7WNVEYANZT7ISFQPO6ID6KSSC/bundle.json","state_url":"https://pith.science/pith/O7WNVEYANZT7ISFQPO6ID6KSSC/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/O7WNVEYANZT7ISFQPO6ID6KSSC/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":"2026-05-19T18:18:36Z","links":{"resolver":"https://pith.science/pith/O7WNVEYANZT7ISFQPO6ID6KSSC","bundle":"https://pith.science/pith/O7WNVEYANZT7ISFQPO6ID6KSSC/bundle.json","state":"https://pith.science/pith/O7WNVEYANZT7ISFQPO6ID6KSSC/state.json","well_known_bundle":"https://pith.science/.well-known/pith/O7WNVEYANZT7ISFQPO6ID6KSSC/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2012:O7WNVEYANZT7ISFQPO6ID6KSSC","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":"adb2e01c74caa7409f825b5fc798de2fc689e58f4d8fd9fede1d5f39e9168030","cross_cats_sorted":["astro-ph.GA"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2012-09-11T06:43:09Z","title_canon_sha256":"78db4933fd7938a00aab6c0b75bba5e04c1dc515804c50cd4aae33661144d368"},"schema_version":"1.0","source":{"id":"1209.2240","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1209.2240","created_at":"2026-05-18T01:54:30Z"},{"alias_kind":"arxiv_version","alias_value":"1209.2240v1","created_at":"2026-05-18T01:54:30Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1209.2240","created_at":"2026-05-18T01:54:30Z"},{"alias_kind":"pith_short_12","alias_value":"O7WNVEYANZT7","created_at":"2026-05-18T12:27:16Z"},{"alias_kind":"pith_short_16","alias_value":"O7WNVEYANZT7ISFQ","created_at":"2026-05-18T12:27:16Z"},{"alias_kind":"pith_short_8","alias_value":"O7WNVEYA","created_at":"2026-05-18T12:27:16Z"}],"graph_snapshots":[{"event_id":"sha256:652b6f0203cec4f8b98daaa3d2a08dd73fd76b9c0eaa7829537f8637b525d54a","target":"graph","created_at":"2026-05-18T01:54:30Z","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":"A number of objects in primitive meteorites have oxygen isotopic compositions that place them on a distinct, mass-independent fractionation line with a slope of one on a three-isotope plot. The most popular model for describing how this fractionation arose assumes that CO self-shielding produced 16O-rich CO and 16O-poor H2O, where the H2O subsequently combined with interstellar dust to form relatively 16O-poor solids within the Solar Nebula. Another model for creating the different reservoirs of 16O-rich gas and 16O-poor solids suggests that these reservoirs were produced by Galactic chemical ","authors_text":"Kurt Liffman, Maria Lugaro, Sarah T. Maddison, Trevor R. Ireland","cross_cats":["astro-ph.GA"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2012-09-11T06:43:09Z","title":"Can Galactic chemical evolution explain the oxygen isotopic variations in the Solar System?"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1209.2240","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":"sha256:0306189b90fd2f47fcc37ddc99e9fba9121bf3388eccced6d92381a60b824867","target":"record","created_at":"2026-05-18T01:54:30Z","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":"adb2e01c74caa7409f825b5fc798de2fc689e58f4d8fd9fede1d5f39e9168030","cross_cats_sorted":["astro-ph.GA"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2012-09-11T06:43:09Z","title_canon_sha256":"78db4933fd7938a00aab6c0b75bba5e04c1dc515804c50cd4aae33661144d368"},"schema_version":"1.0","source":{"id":"1209.2240","kind":"arxiv","version":1}},"canonical_sha256":"77ecda93006e67f448b07bbc81f95290b0e27b26301218e800149d9dff8a854f","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"77ecda93006e67f448b07bbc81f95290b0e27b26301218e800149d9dff8a854f","first_computed_at":"2026-05-18T01:54:30.703717Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:54:30.703717Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"Gck+e/HFWLa4C76981pFuQ3wra3IIxbhQ0aOhz8WdywleejMmHq0/qWQYNyVvj2VtNIko9GKIvZeFym2oEKgBQ==","signature_status":"signed_v1","signed_at":"2026-05-18T01:54:30.704288Z","signed_message":"canonical_sha256_bytes"},"source_id":"1209.2240","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:0306189b90fd2f47fcc37ddc99e9fba9121bf3388eccced6d92381a60b824867","sha256:652b6f0203cec4f8b98daaa3d2a08dd73fd76b9c0eaa7829537f8637b525d54a"],"state_sha256":"bf6f37815b2776e528c0956f1ae222968efd566d352418c1c0ee3b09c2d11aa3"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"X/MgjYtNPjGY5++DJ1GVqEqyVKKEmQoPWeblT1ah16BwWJJjmNTnJMq9NmAbYnTqhPhLv5zqBmGRCnX4F7+qAQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-19T18:18:36.187933Z","bundle_sha256":"da266baa48697c32bad143e5d568a6e688c4fdf81c98ddd54d366aceabf20d04"}}