{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2016:II2RRWUD77ZSKAZN3AWV7DVF5G","short_pith_number":"pith:II2RRWUD","canonical_record":{"source":{"id":"1608.02714","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2016-08-09T08:16:17Z","cross_cats_sorted":[],"title_canon_sha256":"562f54e9ab775a87e087c224a7a60d373a9c43ee09dd7e5c6fc9f53e99285e17","abstract_canon_sha256":"63765c03a22c8da97e6a28cd69ea504f183eea04401f0cc53867ac055659b6fd"},"schema_version":"1.0"},"canonical_sha256":"423518da83fff325032dd82d5f8ea5e9bd1fa34b22bdafb5b3446e038a0105e8","source":{"kind":"arxiv","id":"1608.02714","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1608.02714","created_at":"2026-05-18T01:01:22Z"},{"alias_kind":"arxiv_version","alias_value":"1608.02714v1","created_at":"2026-05-18T01:01:22Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1608.02714","created_at":"2026-05-18T01:01:22Z"},{"alias_kind":"pith_short_12","alias_value":"II2RRWUD77ZS","created_at":"2026-05-18T12:30:22Z"},{"alias_kind":"pith_short_16","alias_value":"II2RRWUD77ZSKAZN","created_at":"2026-05-18T12:30:22Z"},{"alias_kind":"pith_short_8","alias_value":"II2RRWUD","created_at":"2026-05-18T12:30:22Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2016:II2RRWUD77ZSKAZN3AWV7DVF5G","target":"record","payload":{"canonical_record":{"source":{"id":"1608.02714","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2016-08-09T08:16:17Z","cross_cats_sorted":[],"title_canon_sha256":"562f54e9ab775a87e087c224a7a60d373a9c43ee09dd7e5c6fc9f53e99285e17","abstract_canon_sha256":"63765c03a22c8da97e6a28cd69ea504f183eea04401f0cc53867ac055659b6fd"},"schema_version":"1.0"},"canonical_sha256":"423518da83fff325032dd82d5f8ea5e9bd1fa34b22bdafb5b3446e038a0105e8","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:01:22.589141Z","signature_b64":"UW2spk3scTZZNTGZVI0b2LeTJinynXflETOSM3ClUDy5N2SNryntahG+/+8iVEpAgcbgpxStL/dpZuH1E8grDg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"423518da83fff325032dd82d5f8ea5e9bd1fa34b22bdafb5b3446e038a0105e8","last_reissued_at":"2026-05-18T01:01:22.588678Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:01:22.588678Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1608.02714","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":"2026-05-18T01:01:22Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"7/FoeSPkqjXa6RlwI098HcZJy1xc+4H+TofktbqW4WpNbw87oeco8m1LaPn92DE0qPYjHVe7WLlwLw9FnLsLBw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-26T16:48:30.735519Z"},"content_sha256":"a4f54271e5f553fc6160e18022e1d6c170b29bb7275d9b09b7b877a1fc073e19","schema_version":"1.0","event_id":"sha256:a4f54271e5f553fc6160e18022e1d6c170b29bb7275d9b09b7b877a1fc073e19"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2016:II2RRWUD77ZSKAZN3AWV7DVF5G","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"A Search for O_2 in CO-depleted Molecular Cloud Cores with Herschel","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.GA","authors_text":"Cecilia Ceccarelli, Eva S. Wirstr\\\"om, Martin A. Cordiner, Steven B. Charnley","submitted_at":"2016-08-09T08:16:17Z","abstract_excerpt":"The general lack of molecular oxygen in molecular clouds is an outstanding problem in astrochemistry. Extensive searches with SWAS, Odin and Herschel have only produced two detections; upper limits to the O_2 abundance in the remaining sources observed are about 1000 times lower than predicted by chemical models.\n  Previous atomic oxygen observations and inferences from observations of other molecules indicated that high abundances of O atoms might be present in dense cores exhibiting large amounts of CO depletion. Theoretical arguments concerning the oxygen gas-grain interaction in cold dense"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1608.02714","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":"2026-05-18T01:01:22Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"QLU/OzBR8y/OwYiaBuXz88F8ytmUqxkV+JAebJNIfr6qn9j0c9E1ZQKuykWCpYGK2RUnJPuR1oQ74SPCpMccBg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-26T16:48:30.735894Z"},"content_sha256":"50a7a498f3751ac8542a240c2ea6cedd488cf249b7d5399a75dd9cf6b0523947","schema_version":"1.0","event_id":"sha256:50a7a498f3751ac8542a240c2ea6cedd488cf249b7d5399a75dd9cf6b0523947"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/II2RRWUD77ZSKAZN3AWV7DVF5G/bundle.json","state_url":"https://pith.science/pith/II2RRWUD77ZSKAZN3AWV7DVF5G/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/II2RRWUD77ZSKAZN3AWV7DVF5G/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":"2026-06-26T16:48:30Z","links":{"resolver":"https://pith.science/pith/II2RRWUD77ZSKAZN3AWV7DVF5G","bundle":"https://pith.science/pith/II2RRWUD77ZSKAZN3AWV7DVF5G/bundle.json","state":"https://pith.science/pith/II2RRWUD77ZSKAZN3AWV7DVF5G/state.json","well_known_bundle":"https://pith.science/.well-known/pith/II2RRWUD77ZSKAZN3AWV7DVF5G/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2016:II2RRWUD77ZSKAZN3AWV7DVF5G","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":"63765c03a22c8da97e6a28cd69ea504f183eea04401f0cc53867ac055659b6fd","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2016-08-09T08:16:17Z","title_canon_sha256":"562f54e9ab775a87e087c224a7a60d373a9c43ee09dd7e5c6fc9f53e99285e17"},"schema_version":"1.0","source":{"id":"1608.02714","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1608.02714","created_at":"2026-05-18T01:01:22Z"},{"alias_kind":"arxiv_version","alias_value":"1608.02714v1","created_at":"2026-05-18T01:01:22Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1608.02714","created_at":"2026-05-18T01:01:22Z"},{"alias_kind":"pith_short_12","alias_value":"II2RRWUD77ZS","created_at":"2026-05-18T12:30:22Z"},{"alias_kind":"pith_short_16","alias_value":"II2RRWUD77ZSKAZN","created_at":"2026-05-18T12:30:22Z"},{"alias_kind":"pith_short_8","alias_value":"II2RRWUD","created_at":"2026-05-18T12:30:22Z"}],"graph_snapshots":[{"event_id":"sha256:50a7a498f3751ac8542a240c2ea6cedd488cf249b7d5399a75dd9cf6b0523947","target":"graph","created_at":"2026-05-18T01:01:22Z","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":"The general lack of molecular oxygen in molecular clouds is an outstanding problem in astrochemistry. Extensive searches with SWAS, Odin and Herschel have only produced two detections; upper limits to the O_2 abundance in the remaining sources observed are about 1000 times lower than predicted by chemical models.\n  Previous atomic oxygen observations and inferences from observations of other molecules indicated that high abundances of O atoms might be present in dense cores exhibiting large amounts of CO depletion. Theoretical arguments concerning the oxygen gas-grain interaction in cold dense","authors_text":"Cecilia Ceccarelli, Eva S. Wirstr\\\"om, Martin A. Cordiner, Steven B. Charnley","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2016-08-09T08:16:17Z","title":"A Search for O_2 in CO-depleted Molecular Cloud Cores with Herschel"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1608.02714","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:a4f54271e5f553fc6160e18022e1d6c170b29bb7275d9b09b7b877a1fc073e19","target":"record","created_at":"2026-05-18T01:01:22Z","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":"63765c03a22c8da97e6a28cd69ea504f183eea04401f0cc53867ac055659b6fd","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2016-08-09T08:16:17Z","title_canon_sha256":"562f54e9ab775a87e087c224a7a60d373a9c43ee09dd7e5c6fc9f53e99285e17"},"schema_version":"1.0","source":{"id":"1608.02714","kind":"arxiv","version":1}},"canonical_sha256":"423518da83fff325032dd82d5f8ea5e9bd1fa34b22bdafb5b3446e038a0105e8","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"423518da83fff325032dd82d5f8ea5e9bd1fa34b22bdafb5b3446e038a0105e8","first_computed_at":"2026-05-18T01:01:22.588678Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:01:22.588678Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"UW2spk3scTZZNTGZVI0b2LeTJinynXflETOSM3ClUDy5N2SNryntahG+/+8iVEpAgcbgpxStL/dpZuH1E8grDg==","signature_status":"signed_v1","signed_at":"2026-05-18T01:01:22.589141Z","signed_message":"canonical_sha256_bytes"},"source_id":"1608.02714","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:a4f54271e5f553fc6160e18022e1d6c170b29bb7275d9b09b7b877a1fc073e19","sha256:50a7a498f3751ac8542a240c2ea6cedd488cf249b7d5399a75dd9cf6b0523947"],"state_sha256":"fd4d8fadc67ecfefae95d0d3aad9228cec87a58442f1717ed0fe5eef639c08f8"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"o0sxxEGzer51PIjCCEKrxKUSQ44AMPAP4E4zntFeFTblYu82qTAxUNa+lS2UOwvkjtyJ9dZfMtUDTyqaw3UvDA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-26T16:48:30.737874Z","bundle_sha256":"c60dc522b4f609d69eaccd539ac45617b36fb169873e8fac87f3f4e48cd83781"}}