{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2018:Y5DKO2S7ZPUTKVSUJ4X4RPDB64","short_pith_number":"pith:Y5DKO2S7","canonical_record":{"source":{"id":"1803.08446","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2018-03-22T16:40:34Z","cross_cats_sorted":["astro-ph.GA"],"title_canon_sha256":"8d24f4cf01aa801b83da9a5e202a95a73d593b2fc02f1d0d18137fb76fe46fdc","abstract_canon_sha256":"5b9c16dcaf34043cd8062cf42549b08ebad69d25bc668de786fc44f7aa142143"},"schema_version":"1.0"},"canonical_sha256":"c746a76a5fcbe93556544f2fc8bc61f70688b79b58d523c763729c744047579d","source":{"kind":"arxiv","id":"1803.08446","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1803.08446","created_at":"2026-05-18T00:03:06Z"},{"alias_kind":"arxiv_version","alias_value":"1803.08446v2","created_at":"2026-05-18T00:03:06Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1803.08446","created_at":"2026-05-18T00:03:06Z"},{"alias_kind":"pith_short_12","alias_value":"Y5DKO2S7ZPUT","created_at":"2026-05-18T12:33:04Z"},{"alias_kind":"pith_short_16","alias_value":"Y5DKO2S7ZPUTKVSU","created_at":"2026-05-18T12:33:04Z"},{"alias_kind":"pith_short_8","alias_value":"Y5DKO2S7","created_at":"2026-05-18T12:33:04Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2018:Y5DKO2S7ZPUTKVSUJ4X4RPDB64","target":"record","payload":{"canonical_record":{"source":{"id":"1803.08446","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2018-03-22T16:40:34Z","cross_cats_sorted":["astro-ph.GA"],"title_canon_sha256":"8d24f4cf01aa801b83da9a5e202a95a73d593b2fc02f1d0d18137fb76fe46fdc","abstract_canon_sha256":"5b9c16dcaf34043cd8062cf42549b08ebad69d25bc668de786fc44f7aa142143"},"schema_version":"1.0"},"canonical_sha256":"c746a76a5fcbe93556544f2fc8bc61f70688b79b58d523c763729c744047579d","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T00:03:06.455232Z","signature_b64":"O5vnycTSVCEcT59ZWMtpgGhBxEmHq/9/hruvQBoSq3JLyj48EgmXHcQGvpGwOeTc8i0kVCYpEpdAoZY4EnY/CA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"c746a76a5fcbe93556544f2fc8bc61f70688b79b58d523c763729c744047579d","last_reissued_at":"2026-05-18T00:03:06.454697Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T00:03:06.454697Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1803.08446","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":"2026-05-18T00:03:06Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"Q8umK63A4V/7BTFx83KHqvlZO2Iri8fLa13NHLRRK5CcsNnLRcWdlkTsIUehwbIgjKKPlJ1VLAz/PvDrs42KDQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-05T02:38:13.906710Z"},"content_sha256":"1a9b2bbcb519d090d5721a59a7f5c5d9de45e220380d6415ea6bdbf6014aca43","schema_version":"1.0","event_id":"sha256:1a9b2bbcb519d090d5721a59a7f5c5d9de45e220380d6415ea6bdbf6014aca43"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2018:Y5DKO2S7ZPUTKVSUJ4X4RPDB64","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Opening PANDORA's box: APEX observations of CO in PNe","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.GA"],"primary_cat":"astro-ph.SR","authors_text":"A. A. Zijlstra, A. I. Gomez-Ruiz, C. L. Smith, D. Jones, H. M. J. Boffin, Lars-Ake Nyman, L. Guzman-Ramirez, R. Wesson","submitted_at":"2018-03-22T16:40:34Z","abstract_excerpt":"Context. Observations of molecular gas have played a key role in developing the current understanding of the late stages of stellar evolution. Aims. The survey Planetary nebulae AND their cO Reservoir with APEX (PANDORA) was designed to study the circumstellar shells of evolved stars with the aim to estimate their physical parameters. Methods. Millimetre carbon monoxide (CO) emission is the most useful probe of the warm molecular component ejected by low- to intermediate-mass stars. CO is the second-most abundant molecule in the Universe, and the millimeter transitions are easily excited, thus"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1803.08446","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":"2026-05-18T00:03:06Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"SRJQprN1aVJZwDO2Co8/2ovSU14kHyC0s+A60gg6uvFSxizOezSeJFoxrkSYvM+TuWph1nnuAgdZW44vvF0LDw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-05T02:38:13.907058Z"},"content_sha256":"cefe6277633dc3f1082f0b54fe06f225efe9da3316585d302971f337573ae0d3","schema_version":"1.0","event_id":"sha256:cefe6277633dc3f1082f0b54fe06f225efe9da3316585d302971f337573ae0d3"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/Y5DKO2S7ZPUTKVSUJ4X4RPDB64/bundle.json","state_url":"https://pith.science/pith/Y5DKO2S7ZPUTKVSUJ4X4RPDB64/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/Y5DKO2S7ZPUTKVSUJ4X4RPDB64/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":"2026-07-05T02:38:13Z","links":{"resolver":"https://pith.science/pith/Y5DKO2S7ZPUTKVSUJ4X4RPDB64","bundle":"https://pith.science/pith/Y5DKO2S7ZPUTKVSUJ4X4RPDB64/bundle.json","state":"https://pith.science/pith/Y5DKO2S7ZPUTKVSUJ4X4RPDB64/state.json","well_known_bundle":"https://pith.science/.well-known/pith/Y5DKO2S7ZPUTKVSUJ4X4RPDB64/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2018:Y5DKO2S7ZPUTKVSUJ4X4RPDB64","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":"5b9c16dcaf34043cd8062cf42549b08ebad69d25bc668de786fc44f7aa142143","cross_cats_sorted":["astro-ph.GA"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2018-03-22T16:40:34Z","title_canon_sha256":"8d24f4cf01aa801b83da9a5e202a95a73d593b2fc02f1d0d18137fb76fe46fdc"},"schema_version":"1.0","source":{"id":"1803.08446","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1803.08446","created_at":"2026-05-18T00:03:06Z"},{"alias_kind":"arxiv_version","alias_value":"1803.08446v2","created_at":"2026-05-18T00:03:06Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1803.08446","created_at":"2026-05-18T00:03:06Z"},{"alias_kind":"pith_short_12","alias_value":"Y5DKO2S7ZPUT","created_at":"2026-05-18T12:33:04Z"},{"alias_kind":"pith_short_16","alias_value":"Y5DKO2S7ZPUTKVSU","created_at":"2026-05-18T12:33:04Z"},{"alias_kind":"pith_short_8","alias_value":"Y5DKO2S7","created_at":"2026-05-18T12:33:04Z"}],"graph_snapshots":[{"event_id":"sha256:cefe6277633dc3f1082f0b54fe06f225efe9da3316585d302971f337573ae0d3","target":"graph","created_at":"2026-05-18T00:03:06Z","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":"Context. Observations of molecular gas have played a key role in developing the current understanding of the late stages of stellar evolution. Aims. The survey Planetary nebulae AND their cO Reservoir with APEX (PANDORA) was designed to study the circumstellar shells of evolved stars with the aim to estimate their physical parameters. Methods. Millimetre carbon monoxide (CO) emission is the most useful probe of the warm molecular component ejected by low- to intermediate-mass stars. CO is the second-most abundant molecule in the Universe, and the millimeter transitions are easily excited, thus","authors_text":"A. A. Zijlstra, A. I. Gomez-Ruiz, C. L. Smith, D. Jones, H. M. J. Boffin, Lars-Ake Nyman, L. Guzman-Ramirez, R. Wesson","cross_cats":["astro-ph.GA"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2018-03-22T16:40:34Z","title":"Opening PANDORA's box: APEX observations of CO in PNe"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1803.08446","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":"sha256:1a9b2bbcb519d090d5721a59a7f5c5d9de45e220380d6415ea6bdbf6014aca43","target":"record","created_at":"2026-05-18T00:03:06Z","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":"5b9c16dcaf34043cd8062cf42549b08ebad69d25bc668de786fc44f7aa142143","cross_cats_sorted":["astro-ph.GA"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2018-03-22T16:40:34Z","title_canon_sha256":"8d24f4cf01aa801b83da9a5e202a95a73d593b2fc02f1d0d18137fb76fe46fdc"},"schema_version":"1.0","source":{"id":"1803.08446","kind":"arxiv","version":2}},"canonical_sha256":"c746a76a5fcbe93556544f2fc8bc61f70688b79b58d523c763729c744047579d","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"c746a76a5fcbe93556544f2fc8bc61f70688b79b58d523c763729c744047579d","first_computed_at":"2026-05-18T00:03:06.454697Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:03:06.454697Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"O5vnycTSVCEcT59ZWMtpgGhBxEmHq/9/hruvQBoSq3JLyj48EgmXHcQGvpGwOeTc8i0kVCYpEpdAoZY4EnY/CA==","signature_status":"signed_v1","signed_at":"2026-05-18T00:03:06.455232Z","signed_message":"canonical_sha256_bytes"},"source_id":"1803.08446","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:1a9b2bbcb519d090d5721a59a7f5c5d9de45e220380d6415ea6bdbf6014aca43","sha256:cefe6277633dc3f1082f0b54fe06f225efe9da3316585d302971f337573ae0d3"],"state_sha256":"fc569f50fdd5b9f05cb968d9576d8a5ba4f84695c91856f8e96146303350d80f"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"os/pgGq2V0hcFAAxuKBJphXMvuukUUNSXlBkwGRvYoF6Aw7blVnjZK9zFCav0avvj6U7nfVIbqc/uC0WNFYyDw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-07-05T02:38:13.908924Z","bundle_sha256":"26ffd400372d6ab59b432a970a20c2849c381c38e3b110db1e8072477dd4b5a8"}}