{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2018:QDGUTCBOQIZSN5Q5CRBUAEXXEM","short_pith_number":"pith:QDGUTCBO","canonical_record":{"source":{"id":"1809.07598","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2018-09-20T12:59:17Z","cross_cats_sorted":[],"title_canon_sha256":"b8bdf8ffe8f4ec97ead55172a2b4c9d903996cfe2942976db1e90e83604b4954","abstract_canon_sha256":"a0489846a1010ea7a3a87997f92634392b6d91fe93bdaeb4c42716b0364d5bde"},"schema_version":"1.0"},"canonical_sha256":"80cd49882e823326f61d14434012f72307e525f70c60d732b181fd4d4a10d1a6","source":{"kind":"arxiv","id":"1809.07598","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1809.07598","created_at":"2026-05-17T23:59:49Z"},{"alias_kind":"arxiv_version","alias_value":"1809.07598v1","created_at":"2026-05-17T23:59:49Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1809.07598","created_at":"2026-05-17T23:59:49Z"},{"alias_kind":"pith_short_12","alias_value":"QDGUTCBOQIZS","created_at":"2026-05-18T12:32:46Z"},{"alias_kind":"pith_short_16","alias_value":"QDGUTCBOQIZSN5Q5","created_at":"2026-05-18T12:32:46Z"},{"alias_kind":"pith_short_8","alias_value":"QDGUTCBO","created_at":"2026-05-18T12:32:46Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2018:QDGUTCBOQIZSN5Q5CRBUAEXXEM","target":"record","payload":{"canonical_record":{"source":{"id":"1809.07598","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2018-09-20T12:59:17Z","cross_cats_sorted":[],"title_canon_sha256":"b8bdf8ffe8f4ec97ead55172a2b4c9d903996cfe2942976db1e90e83604b4954","abstract_canon_sha256":"a0489846a1010ea7a3a87997f92634392b6d91fe93bdaeb4c42716b0364d5bde"},"schema_version":"1.0"},"canonical_sha256":"80cd49882e823326f61d14434012f72307e525f70c60d732b181fd4d4a10d1a6","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-17T23:59:49.726957Z","signature_b64":"udF44JBol6TFoVWdNOiLcBO3lvD/bWixwLCQI3IR0DprzKl9qUYMc0qpfgMLXjD6owUURkO2R7DnZDy3NfL1Aw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"80cd49882e823326f61d14434012f72307e525f70c60d732b181fd4d4a10d1a6","last_reissued_at":"2026-05-17T23:59:49.726443Z","signature_status":"signed_v1","first_computed_at":"2026-05-17T23:59:49.726443Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1809.07598","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":"2026-05-17T23:59:49Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"XopQ5/abE/674aVbrp/QpLum4R+ko2GCCjFL8W0H7V2vNXOFe2hZMPXs268m7ncAb8sGKW7J7Oulq9hBQId7DQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-03T12:44:18.179069Z"},"content_sha256":"6a0a8150dc7401bebfcb66721d62593807d7003b9cdbcc6732d03c4ea8508450","schema_version":"1.0","event_id":"sha256:6a0a8150dc7401bebfcb66721d62593807d7003b9cdbcc6732d03c4ea8508450"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2018:QDGUTCBOQIZSN5Q5CRBUAEXXEM","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"The Serpens filament: at the onset of slightly supercritical collapse","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.GA","authors_text":"C. Henkel, G.~X. Li, J.~X. Sun, K. M.~Menten, M. Fang, M. Wang, R.~Q. Mao, Y. Gong","submitted_at":"2018-09-20T12:59:17Z","abstract_excerpt":"The Serpens filament, as one of the nearest infrared dark clouds, is regarded as a pristine filament at a very early evolutionary stage of star formation. In order to study its molecular content and dynamical state, we mapped this filament in seven species. Among them, HCO$^{+}$, HNC, HCN, and CS show self-absorption, while C$^{18}$O is most sensitive to the filamentary structure. A kinematic analysis demonstrates that this filament forms a velocity-coherent (trans-)sonic structure, a large part of which is one of the most quiescent regions in the Serpens cloud. Widespread C$^{18}$O depletion "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1809.07598","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":"2026-05-17T23:59:49Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"1d94W0JfH2qk0Nbg/wLn0JX+2RT4oRQpVqzxhbxyUuMrMFSIo9SNKkdZyUtfNcbyhJhxU+tRqe74pzZAXmxXBQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-03T12:44:18.179431Z"},"content_sha256":"6496f30f4d8c0d148d416a98142446a9d004ae4c30caeba97080f3a98601f756","schema_version":"1.0","event_id":"sha256:6496f30f4d8c0d148d416a98142446a9d004ae4c30caeba97080f3a98601f756"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/QDGUTCBOQIZSN5Q5CRBUAEXXEM/bundle.json","state_url":"https://pith.science/pith/QDGUTCBOQIZSN5Q5CRBUAEXXEM/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/QDGUTCBOQIZSN5Q5CRBUAEXXEM/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":"2026-06-03T12:44:18Z","links":{"resolver":"https://pith.science/pith/QDGUTCBOQIZSN5Q5CRBUAEXXEM","bundle":"https://pith.science/pith/QDGUTCBOQIZSN5Q5CRBUAEXXEM/bundle.json","state":"https://pith.science/pith/QDGUTCBOQIZSN5Q5CRBUAEXXEM/state.json","well_known_bundle":"https://pith.science/.well-known/pith/QDGUTCBOQIZSN5Q5CRBUAEXXEM/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2018:QDGUTCBOQIZSN5Q5CRBUAEXXEM","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":"a0489846a1010ea7a3a87997f92634392b6d91fe93bdaeb4c42716b0364d5bde","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2018-09-20T12:59:17Z","title_canon_sha256":"b8bdf8ffe8f4ec97ead55172a2b4c9d903996cfe2942976db1e90e83604b4954"},"schema_version":"1.0","source":{"id":"1809.07598","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1809.07598","created_at":"2026-05-17T23:59:49Z"},{"alias_kind":"arxiv_version","alias_value":"1809.07598v1","created_at":"2026-05-17T23:59:49Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1809.07598","created_at":"2026-05-17T23:59:49Z"},{"alias_kind":"pith_short_12","alias_value":"QDGUTCBOQIZS","created_at":"2026-05-18T12:32:46Z"},{"alias_kind":"pith_short_16","alias_value":"QDGUTCBOQIZSN5Q5","created_at":"2026-05-18T12:32:46Z"},{"alias_kind":"pith_short_8","alias_value":"QDGUTCBO","created_at":"2026-05-18T12:32:46Z"}],"graph_snapshots":[{"event_id":"sha256:6496f30f4d8c0d148d416a98142446a9d004ae4c30caeba97080f3a98601f756","target":"graph","created_at":"2026-05-17T23:59:49Z","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 Serpens filament, as one of the nearest infrared dark clouds, is regarded as a pristine filament at a very early evolutionary stage of star formation. In order to study its molecular content and dynamical state, we mapped this filament in seven species. Among them, HCO$^{+}$, HNC, HCN, and CS show self-absorption, while C$^{18}$O is most sensitive to the filamentary structure. A kinematic analysis demonstrates that this filament forms a velocity-coherent (trans-)sonic structure, a large part of which is one of the most quiescent regions in the Serpens cloud. Widespread C$^{18}$O depletion ","authors_text":"C. Henkel, G.~X. Li, J.~X. Sun, K. M.~Menten, M. Fang, M. Wang, R.~Q. Mao, Y. Gong","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2018-09-20T12:59:17Z","title":"The Serpens filament: at the onset of slightly supercritical collapse"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1809.07598","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":"sha256:6a0a8150dc7401bebfcb66721d62593807d7003b9cdbcc6732d03c4ea8508450","target":"record","created_at":"2026-05-17T23:59:49Z","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":"a0489846a1010ea7a3a87997f92634392b6d91fe93bdaeb4c42716b0364d5bde","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2018-09-20T12:59:17Z","title_canon_sha256":"b8bdf8ffe8f4ec97ead55172a2b4c9d903996cfe2942976db1e90e83604b4954"},"schema_version":"1.0","source":{"id":"1809.07598","kind":"arxiv","version":1}},"canonical_sha256":"80cd49882e823326f61d14434012f72307e525f70c60d732b181fd4d4a10d1a6","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"80cd49882e823326f61d14434012f72307e525f70c60d732b181fd4d4a10d1a6","first_computed_at":"2026-05-17T23:59:49.726443Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-17T23:59:49.726443Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"udF44JBol6TFoVWdNOiLcBO3lvD/bWixwLCQI3IR0DprzKl9qUYMc0qpfgMLXjD6owUURkO2R7DnZDy3NfL1Aw==","signature_status":"signed_v1","signed_at":"2026-05-17T23:59:49.726957Z","signed_message":"canonical_sha256_bytes"},"source_id":"1809.07598","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:6a0a8150dc7401bebfcb66721d62593807d7003b9cdbcc6732d03c4ea8508450","sha256:6496f30f4d8c0d148d416a98142446a9d004ae4c30caeba97080f3a98601f756"],"state_sha256":"b4983bf3d9b8d6544322d10e17e88d060467d879323a28badcc33feb45296552"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"+OVfHWsVVnPswFLLsJWs4cyWLn3wW6RnSxIbSZ997Pw/qMU45sTV6NGdqJytDHs50++9WqgsVvRUVcuMWi6TDQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-03T12:44:18.181695Z","bundle_sha256":"fd8be99bf37ef07fce0ae3e885d38920508f6b11da1c7f2bc065ff8d7d2662a5"}}