{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2017:WDVTQZECTXAFD7ILR3Z4EDBKKU","short_pith_number":"pith:WDVTQZEC","canonical_record":{"source":{"id":"1711.03457","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2017-11-09T16:24:10Z","cross_cats_sorted":["physics.chem-ph"],"title_canon_sha256":"d94d24b184a225fb793aa6205662745c01dbeed3b6e4a92732f913bdca7bfb3f","abstract_canon_sha256":"3c97e9733e3fc5c1e4c792e11047be2a733cd09c7095692b3146851f371bb432"},"schema_version":"1.0"},"canonical_sha256":"b0eb3864829dc051fd0b8ef3c20c2a55160fcbcbba845094999e9d6fd42f0f61","source":{"kind":"arxiv","id":"1711.03457","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1711.03457","created_at":"2026-05-18T00:22:57Z"},{"alias_kind":"arxiv_version","alias_value":"1711.03457v1","created_at":"2026-05-18T00:22:57Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1711.03457","created_at":"2026-05-18T00:22:57Z"},{"alias_kind":"pith_short_12","alias_value":"WDVTQZECTXAF","created_at":"2026-05-18T12:31:53Z"},{"alias_kind":"pith_short_16","alias_value":"WDVTQZECTXAFD7IL","created_at":"2026-05-18T12:31:53Z"},{"alias_kind":"pith_short_8","alias_value":"WDVTQZEC","created_at":"2026-05-18T12:31:53Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2017:WDVTQZECTXAFD7ILR3Z4EDBKKU","target":"record","payload":{"canonical_record":{"source":{"id":"1711.03457","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2017-11-09T16:24:10Z","cross_cats_sorted":["physics.chem-ph"],"title_canon_sha256":"d94d24b184a225fb793aa6205662745c01dbeed3b6e4a92732f913bdca7bfb3f","abstract_canon_sha256":"3c97e9733e3fc5c1e4c792e11047be2a733cd09c7095692b3146851f371bb432"},"schema_version":"1.0"},"canonical_sha256":"b0eb3864829dc051fd0b8ef3c20c2a55160fcbcbba845094999e9d6fd42f0f61","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T00:22:57.879419Z","signature_b64":"ih9LTbdAfT1ucQLEelsiPOchZHL6dn5adtA80pDMA8haHaeBDf+hwfOuHyfuuigmb/NT0aYYxpdqJ9H7YEt0DA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"b0eb3864829dc051fd0b8ef3c20c2a55160fcbcbba845094999e9d6fd42f0f61","last_reissued_at":"2026-05-18T00:22:57.878975Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T00:22:57.878975Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1711.03457","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":"2026-05-18T00:22:57Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"HIEoN07ztICKkx/pxV3XehQveTmrlpuZ6IaGSAiWhNeec0Pil1KqKhYVcmGdWhn0/DE/u8ogb7poQX+3je3FAg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-20T03:20:53.906261Z"},"content_sha256":"b7dde6aa8580bfa4feb8fa41cc5e4b087dfa7b27a41031769d58fbf6161f43d2","schema_version":"1.0","event_id":"sha256:b7dde6aa8580bfa4feb8fa41cc5e4b087dfa7b27a41031769d58fbf6161f43d2"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2017:WDVTQZECTXAFD7ILR3Z4EDBKKU","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"The formation of urea in space I. Ion-molecule, neutral-neutral, and radical gas-phase reactions","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["physics.chem-ph"],"primary_cat":"astro-ph.GA","authors_text":"Antonio Largo, Flavio Siro Brigiano, Riccardo Spezia, Yannick Jeanvoine","submitted_at":"2017-11-09T16:24:10Z","abstract_excerpt":"Many organic molecules have been observed in the interstellar medium thanks to advances in radioastronomy, and very recently the presence of urea was also suggested. While those molecules were observed, it is not clear what the mechanisms responsible to their formation are. In fact, if gas-phase reactions are responsible, they should occur through barrierless mechanisms (or with very low barriers). In the past, mechanisms for the formation of different organic molecules were studied, providing only in a few cases energetic conditions favorable to a synthesis at very low temperature. A particul"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1711.03457","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":"2026-05-18T00:22:57Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"XItKYI7nsl8DqbytmhiQx/XzVDB7Gy4V6JBsPbljkYR4FY+ITcwjr1+mOZzC0mWKjDLu09D2Bj/CuQXU+LfGDw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-20T03:20:53.906678Z"},"content_sha256":"9cedbf07e18d508244c5737cbab9318051155e2c2f75e19d97422aabc8d32e43","schema_version":"1.0","event_id":"sha256:9cedbf07e18d508244c5737cbab9318051155e2c2f75e19d97422aabc8d32e43"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/WDVTQZECTXAFD7ILR3Z4EDBKKU/bundle.json","state_url":"https://pith.science/pith/WDVTQZECTXAFD7ILR3Z4EDBKKU/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/WDVTQZECTXAFD7ILR3Z4EDBKKU/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":"2026-06-20T03:20:53Z","links":{"resolver":"https://pith.science/pith/WDVTQZECTXAFD7ILR3Z4EDBKKU","bundle":"https://pith.science/pith/WDVTQZECTXAFD7ILR3Z4EDBKKU/bundle.json","state":"https://pith.science/pith/WDVTQZECTXAFD7ILR3Z4EDBKKU/state.json","well_known_bundle":"https://pith.science/.well-known/pith/WDVTQZECTXAFD7ILR3Z4EDBKKU/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2017:WDVTQZECTXAFD7ILR3Z4EDBKKU","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":"3c97e9733e3fc5c1e4c792e11047be2a733cd09c7095692b3146851f371bb432","cross_cats_sorted":["physics.chem-ph"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2017-11-09T16:24:10Z","title_canon_sha256":"d94d24b184a225fb793aa6205662745c01dbeed3b6e4a92732f913bdca7bfb3f"},"schema_version":"1.0","source":{"id":"1711.03457","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1711.03457","created_at":"2026-05-18T00:22:57Z"},{"alias_kind":"arxiv_version","alias_value":"1711.03457v1","created_at":"2026-05-18T00:22:57Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1711.03457","created_at":"2026-05-18T00:22:57Z"},{"alias_kind":"pith_short_12","alias_value":"WDVTQZECTXAF","created_at":"2026-05-18T12:31:53Z"},{"alias_kind":"pith_short_16","alias_value":"WDVTQZECTXAFD7IL","created_at":"2026-05-18T12:31:53Z"},{"alias_kind":"pith_short_8","alias_value":"WDVTQZEC","created_at":"2026-05-18T12:31:53Z"}],"graph_snapshots":[{"event_id":"sha256:9cedbf07e18d508244c5737cbab9318051155e2c2f75e19d97422aabc8d32e43","target":"graph","created_at":"2026-05-18T00:22:57Z","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":"Many organic molecules have been observed in the interstellar medium thanks to advances in radioastronomy, and very recently the presence of urea was also suggested. While those molecules were observed, it is not clear what the mechanisms responsible to their formation are. In fact, if gas-phase reactions are responsible, they should occur through barrierless mechanisms (or with very low barriers). In the past, mechanisms for the formation of different organic molecules were studied, providing only in a few cases energetic conditions favorable to a synthesis at very low temperature. A particul","authors_text":"Antonio Largo, Flavio Siro Brigiano, Riccardo Spezia, Yannick Jeanvoine","cross_cats":["physics.chem-ph"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2017-11-09T16:24:10Z","title":"The formation of urea in space I. Ion-molecule, neutral-neutral, and radical gas-phase reactions"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1711.03457","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:b7dde6aa8580bfa4feb8fa41cc5e4b087dfa7b27a41031769d58fbf6161f43d2","target":"record","created_at":"2026-05-18T00:22:57Z","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":"3c97e9733e3fc5c1e4c792e11047be2a733cd09c7095692b3146851f371bb432","cross_cats_sorted":["physics.chem-ph"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2017-11-09T16:24:10Z","title_canon_sha256":"d94d24b184a225fb793aa6205662745c01dbeed3b6e4a92732f913bdca7bfb3f"},"schema_version":"1.0","source":{"id":"1711.03457","kind":"arxiv","version":1}},"canonical_sha256":"b0eb3864829dc051fd0b8ef3c20c2a55160fcbcbba845094999e9d6fd42f0f61","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"b0eb3864829dc051fd0b8ef3c20c2a55160fcbcbba845094999e9d6fd42f0f61","first_computed_at":"2026-05-18T00:22:57.878975Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:22:57.878975Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"ih9LTbdAfT1ucQLEelsiPOchZHL6dn5adtA80pDMA8haHaeBDf+hwfOuHyfuuigmb/NT0aYYxpdqJ9H7YEt0DA==","signature_status":"signed_v1","signed_at":"2026-05-18T00:22:57.879419Z","signed_message":"canonical_sha256_bytes"},"source_id":"1711.03457","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:b7dde6aa8580bfa4feb8fa41cc5e4b087dfa7b27a41031769d58fbf6161f43d2","sha256:9cedbf07e18d508244c5737cbab9318051155e2c2f75e19d97422aabc8d32e43"],"state_sha256":"1caa83185cb04d9bed1f3b79ab45ba445a1377b0896c90f8824fe64e85e71c37"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"icOAyJgJJQEvJovvKCDAGSfA8zNJ46jDa/zKquFkGJ0wDUxjfeTFwZbguzHRMODWyhn7Sv2lBQHlQCKtiVzFBQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-20T03:20:53.908691Z","bundle_sha256":"eb4659dee96931c2878ed723b42f69c015686108fa5dee63a4e33ddbad88976b"}}