{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2013:YSMVSIGDLM5QXLYNU3LWPXFC54","short_pith_number":"pith:YSMVSIGD","canonical_record":{"source":{"id":"1309.1164","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2013-09-04T20:00:02Z","cross_cats_sorted":[],"title_canon_sha256":"0b23226400ab00a47f51adc8d325e1f9094a429d20a2095d9e1f4215d2842455","abstract_canon_sha256":"bd6ff34bdae06bc58942f346c31753d338a2ca402cc321078860016f696f44c5"},"schema_version":"1.0"},"canonical_sha256":"c4995920c35b3b0baf0da6d767dca2ef147e4b1c2a047a7d8c2e981ea7e92c87","source":{"kind":"arxiv","id":"1309.1164","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1309.1164","created_at":"2026-05-18T00:48:47Z"},{"alias_kind":"arxiv_version","alias_value":"1309.1164v1","created_at":"2026-05-18T00:48:47Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1309.1164","created_at":"2026-05-18T00:48:47Z"},{"alias_kind":"pith_short_12","alias_value":"YSMVSIGDLM5Q","created_at":"2026-05-18T12:28:09Z"},{"alias_kind":"pith_short_16","alias_value":"YSMVSIGDLM5QXLYN","created_at":"2026-05-18T12:28:09Z"},{"alias_kind":"pith_short_8","alias_value":"YSMVSIGD","created_at":"2026-05-18T12:28:09Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2013:YSMVSIGDLM5QXLYNU3LWPXFC54","target":"record","payload":{"canonical_record":{"source":{"id":"1309.1164","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2013-09-04T20:00:02Z","cross_cats_sorted":[],"title_canon_sha256":"0b23226400ab00a47f51adc8d325e1f9094a429d20a2095d9e1f4215d2842455","abstract_canon_sha256":"bd6ff34bdae06bc58942f346c31753d338a2ca402cc321078860016f696f44c5"},"schema_version":"1.0"},"canonical_sha256":"c4995920c35b3b0baf0da6d767dca2ef147e4b1c2a047a7d8c2e981ea7e92c87","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T00:48:47.930351Z","signature_b64":"inTwu4RnFS39FP+IqJSVYiyn3Y3Am3eSHp/hQmRnomoUa3k5cvOBQgWGHp/qAwlxcESXkYwcEFo3Y+Jcllf2BQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"c4995920c35b3b0baf0da6d767dca2ef147e4b1c2a047a7d8c2e981ea7e92c87","last_reissued_at":"2026-05-18T00:48:47.929583Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T00:48:47.929583Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1309.1164","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":"2026-05-18T00:48:47Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"GBWST1GRGC5t5SoPTZj5l8a/A3J4brie+0qr2+7CoSMwhqZathpTGt4IQZEKFE5n+1eLMJkvzR/fJx9ThyxkCw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-30T18:06:33.677029Z"},"content_sha256":"cd99157d546482ee192a0cb341cd285790057b6c56111fe07644de322429abc1","schema_version":"1.0","event_id":"sha256:cd99157d546482ee192a0cb341cd285790057b6c56111fe07644de322429abc1"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2013:YSMVSIGDLM5QXLYNU3LWPXFC54","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Glycolaldehyde Formation via the Dimerisation of the Formyl Radical","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.SR","authors_text":"(2) Department of Chemistry, Ben Slater (2), Daren J. Burke (2) ((1) Department of Physics & Astronomy, Paul M. Woods (1), Serena Viti (1), UK, UK), University College London, Wendy A. Brown (2), Zamaan Raza (2)","submitted_at":"2013-09-04T20:00:02Z","abstract_excerpt":"Glycolaldehyde, the simplest monosaccharide sugar, has recently been detected in low- and high-mass star-forming cores. Following on from our previous investigation into glycolaldehyde formation (Woods et al. 2012, ApJ, 750, 19), we now consider a further mechanism for the formation of glycolaldehyde that involves the dimerisation of the formyl radical, HCO. Quantum mechanical investigation of the HCO dimerisation process upon an ice surface is predicted to be barrierless and therefore fast. In an astrophysical context, we show that this mechanism can be very efficient in star-forming cores. I"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1309.1164","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":"2026-05-18T00:48:47Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"HOIQ+NWyksA7KjYEn39SZnU0h/AYtDtmAp9o8mffByqDTZwhsZgXMMjbF4DJOfjFGRXBmlNL1MyzVwG5v6JDAw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-30T18:06:33.677813Z"},"content_sha256":"5f00c7801d82282176634cac2c7e44a44d180a33777a3d2693694516d391ee56","schema_version":"1.0","event_id":"sha256:5f00c7801d82282176634cac2c7e44a44d180a33777a3d2693694516d391ee56"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/YSMVSIGDLM5QXLYNU3LWPXFC54/bundle.json","state_url":"https://pith.science/pith/YSMVSIGDLM5QXLYNU3LWPXFC54/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/YSMVSIGDLM5QXLYNU3LWPXFC54/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":"2026-05-30T18:06:33Z","links":{"resolver":"https://pith.science/pith/YSMVSIGDLM5QXLYNU3LWPXFC54","bundle":"https://pith.science/pith/YSMVSIGDLM5QXLYNU3LWPXFC54/bundle.json","state":"https://pith.science/pith/YSMVSIGDLM5QXLYNU3LWPXFC54/state.json","well_known_bundle":"https://pith.science/.well-known/pith/YSMVSIGDLM5QXLYNU3LWPXFC54/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2013:YSMVSIGDLM5QXLYNU3LWPXFC54","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":"bd6ff34bdae06bc58942f346c31753d338a2ca402cc321078860016f696f44c5","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2013-09-04T20:00:02Z","title_canon_sha256":"0b23226400ab00a47f51adc8d325e1f9094a429d20a2095d9e1f4215d2842455"},"schema_version":"1.0","source":{"id":"1309.1164","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1309.1164","created_at":"2026-05-18T00:48:47Z"},{"alias_kind":"arxiv_version","alias_value":"1309.1164v1","created_at":"2026-05-18T00:48:47Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1309.1164","created_at":"2026-05-18T00:48:47Z"},{"alias_kind":"pith_short_12","alias_value":"YSMVSIGDLM5Q","created_at":"2026-05-18T12:28:09Z"},{"alias_kind":"pith_short_16","alias_value":"YSMVSIGDLM5QXLYN","created_at":"2026-05-18T12:28:09Z"},{"alias_kind":"pith_short_8","alias_value":"YSMVSIGD","created_at":"2026-05-18T12:28:09Z"}],"graph_snapshots":[{"event_id":"sha256:5f00c7801d82282176634cac2c7e44a44d180a33777a3d2693694516d391ee56","target":"graph","created_at":"2026-05-18T00:48:47Z","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":"Glycolaldehyde, the simplest monosaccharide sugar, has recently been detected in low- and high-mass star-forming cores. Following on from our previous investigation into glycolaldehyde formation (Woods et al. 2012, ApJ, 750, 19), we now consider a further mechanism for the formation of glycolaldehyde that involves the dimerisation of the formyl radical, HCO. Quantum mechanical investigation of the HCO dimerisation process upon an ice surface is predicted to be barrierless and therefore fast. In an astrophysical context, we show that this mechanism can be very efficient in star-forming cores. I","authors_text":"(2) Department of Chemistry, Ben Slater (2), Daren J. Burke (2) ((1) Department of Physics & Astronomy, Paul M. Woods (1), Serena Viti (1), UK, UK), University College London, Wendy A. Brown (2), Zamaan Raza (2)","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2013-09-04T20:00:02Z","title":"Glycolaldehyde Formation via the Dimerisation of the Formyl Radical"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1309.1164","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:cd99157d546482ee192a0cb341cd285790057b6c56111fe07644de322429abc1","target":"record","created_at":"2026-05-18T00:48:47Z","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":"bd6ff34bdae06bc58942f346c31753d338a2ca402cc321078860016f696f44c5","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2013-09-04T20:00:02Z","title_canon_sha256":"0b23226400ab00a47f51adc8d325e1f9094a429d20a2095d9e1f4215d2842455"},"schema_version":"1.0","source":{"id":"1309.1164","kind":"arxiv","version":1}},"canonical_sha256":"c4995920c35b3b0baf0da6d767dca2ef147e4b1c2a047a7d8c2e981ea7e92c87","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"c4995920c35b3b0baf0da6d767dca2ef147e4b1c2a047a7d8c2e981ea7e92c87","first_computed_at":"2026-05-18T00:48:47.929583Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:48:47.929583Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"inTwu4RnFS39FP+IqJSVYiyn3Y3Am3eSHp/hQmRnomoUa3k5cvOBQgWGHp/qAwlxcESXkYwcEFo3Y+Jcllf2BQ==","signature_status":"signed_v1","signed_at":"2026-05-18T00:48:47.930351Z","signed_message":"canonical_sha256_bytes"},"source_id":"1309.1164","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:cd99157d546482ee192a0cb341cd285790057b6c56111fe07644de322429abc1","sha256:5f00c7801d82282176634cac2c7e44a44d180a33777a3d2693694516d391ee56"],"state_sha256":"4cca9d0d65d361f36e19c5afb6b48ba4357da1fd6b3fd0446d16c9115a8fca5b"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"mkkcKRQ8yDpv1VRGe7N+eaZpMq7PDr4hTjKJxZyAnIQ/5k2tGOvX228+SudnT+XfOk1v9E9NoFsTy9vSlpUPDg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-30T18:06:33.681007Z","bundle_sha256":"e8bf8044d07d47e64e93553d7d9d70721fcbe85ff809c7ec1f309262c8fa3600"}}