{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2016:MOP2Z72R6QDBGRB5N7BZTVTWHO","short_pith_number":"pith:MOP2Z72R","canonical_record":{"source":{"id":"1611.00719","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2016-11-02T18:37:06Z","cross_cats_sorted":[],"title_canon_sha256":"069d831ff0feff7868fc76255e1cbc36faa4d7cded3734a673f00e7a47b83379","abstract_canon_sha256":"7821442c088fe69dd8999fc422c12e6fce414632e584c5f3fe3f6c63e3779a3f"},"schema_version":"1.0"},"canonical_sha256":"639facff51f40613443d6fc399d6763b88882ea7af488d8a1b4e2c47afac45da","source":{"kind":"arxiv","id":"1611.00719","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1611.00719","created_at":"2026-05-18T00:50:18Z"},{"alias_kind":"arxiv_version","alias_value":"1611.00719v1","created_at":"2026-05-18T00:50:18Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1611.00719","created_at":"2026-05-18T00:50:18Z"},{"alias_kind":"pith_short_12","alias_value":"MOP2Z72R6QDB","created_at":"2026-05-18T12:30:32Z"},{"alias_kind":"pith_short_16","alias_value":"MOP2Z72R6QDBGRB5","created_at":"2026-05-18T12:30:32Z"},{"alias_kind":"pith_short_8","alias_value":"MOP2Z72R","created_at":"2026-05-18T12:30:32Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2016:MOP2Z72R6QDBGRB5N7BZTVTWHO","target":"record","payload":{"canonical_record":{"source":{"id":"1611.00719","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2016-11-02T18:37:06Z","cross_cats_sorted":[],"title_canon_sha256":"069d831ff0feff7868fc76255e1cbc36faa4d7cded3734a673f00e7a47b83379","abstract_canon_sha256":"7821442c088fe69dd8999fc422c12e6fce414632e584c5f3fe3f6c63e3779a3f"},"schema_version":"1.0"},"canonical_sha256":"639facff51f40613443d6fc399d6763b88882ea7af488d8a1b4e2c47afac45da","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T00:50:18.331962Z","signature_b64":"Zc1MHKqt9FjNVDwOe6r/sQ87auj2Vil1smiorwgdGhVY8e/f81ECq2lxVrF2UVXj4eVvCenyoQLAXWc3fTL1Dw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"639facff51f40613443d6fc399d6763b88882ea7af488d8a1b4e2c47afac45da","last_reissued_at":"2026-05-18T00:50:18.331249Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T00:50:18.331249Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1611.00719","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":"2026-05-18T00:50:18Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"dRsdurPCVbJqOfUa/EmTbSf7/4zjW4Iy1V5LhZvXLdsDfpo26fr5zCymuYWHNaDA8LL6+LvpteapgwAbX9NgCQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-19T09:07:58.948381Z"},"content_sha256":"97088c45bac96373882010cb170ab43498eec84a194f3f598203c3a957266979","schema_version":"1.0","event_id":"sha256:97088c45bac96373882010cb170ab43498eec84a194f3f598203c3a957266979"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2016:MOP2Z72R6QDBGRB5N7BZTVTWHO","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"On the chemical ladder of esters. Detection and formation of ethyl formate in the W51 e2 hot molecular core","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.GA","authors_text":"F. Fontani, J. Mart\\'in-Pintado, M. T. Beltr\\'an, P. Caselli, R. Cesaroni, V. M. Rivilla","submitted_at":"2016-11-02T18:37:06Z","abstract_excerpt":"The detection of organic molecules with increasing complexity and potential biological relevance is opening the possibility to understand the formation of the building blocks of life in the interstellar medium. One of the families of molecules with astrobiological interest are the esters, whose simplest member, methyl formate, is rather abundant in star-forming regions. The next step in the chemical complexity of esters is ethyl formate, C$_2$H$_5$OCHO. Only two detections of this species have been reported so far, which strongly limits our understanding of how complex molecules are formed in "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1611.00719","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":"2026-05-18T00:50:18Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"MnEkYBBCw36p2KXyceKnAsHNy6e9LZ4iOP1s8PH7sRFV+WooRo6Rh60UFZy8YiMN1mhgtXCgkxCIIc9X2/9+Cg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-19T09:07:58.949104Z"},"content_sha256":"006b63440ee9b10f7bc52c4b6d9bacb9c73291776a9e03eed5244b845b1c9205","schema_version":"1.0","event_id":"sha256:006b63440ee9b10f7bc52c4b6d9bacb9c73291776a9e03eed5244b845b1c9205"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/MOP2Z72R6QDBGRB5N7BZTVTWHO/bundle.json","state_url":"https://pith.science/pith/MOP2Z72R6QDBGRB5N7BZTVTWHO/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/MOP2Z72R6QDBGRB5N7BZTVTWHO/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":"2026-05-19T09:07:58Z","links":{"resolver":"https://pith.science/pith/MOP2Z72R6QDBGRB5N7BZTVTWHO","bundle":"https://pith.science/pith/MOP2Z72R6QDBGRB5N7BZTVTWHO/bundle.json","state":"https://pith.science/pith/MOP2Z72R6QDBGRB5N7BZTVTWHO/state.json","well_known_bundle":"https://pith.science/.well-known/pith/MOP2Z72R6QDBGRB5N7BZTVTWHO/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2016:MOP2Z72R6QDBGRB5N7BZTVTWHO","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":"7821442c088fe69dd8999fc422c12e6fce414632e584c5f3fe3f6c63e3779a3f","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2016-11-02T18:37:06Z","title_canon_sha256":"069d831ff0feff7868fc76255e1cbc36faa4d7cded3734a673f00e7a47b83379"},"schema_version":"1.0","source":{"id":"1611.00719","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1611.00719","created_at":"2026-05-18T00:50:18Z"},{"alias_kind":"arxiv_version","alias_value":"1611.00719v1","created_at":"2026-05-18T00:50:18Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1611.00719","created_at":"2026-05-18T00:50:18Z"},{"alias_kind":"pith_short_12","alias_value":"MOP2Z72R6QDB","created_at":"2026-05-18T12:30:32Z"},{"alias_kind":"pith_short_16","alias_value":"MOP2Z72R6QDBGRB5","created_at":"2026-05-18T12:30:32Z"},{"alias_kind":"pith_short_8","alias_value":"MOP2Z72R","created_at":"2026-05-18T12:30:32Z"}],"graph_snapshots":[{"event_id":"sha256:006b63440ee9b10f7bc52c4b6d9bacb9c73291776a9e03eed5244b845b1c9205","target":"graph","created_at":"2026-05-18T00:50:18Z","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 detection of organic molecules with increasing complexity and potential biological relevance is opening the possibility to understand the formation of the building blocks of life in the interstellar medium. One of the families of molecules with astrobiological interest are the esters, whose simplest member, methyl formate, is rather abundant in star-forming regions. The next step in the chemical complexity of esters is ethyl formate, C$_2$H$_5$OCHO. Only two detections of this species have been reported so far, which strongly limits our understanding of how complex molecules are formed in ","authors_text":"F. Fontani, J. Mart\\'in-Pintado, M. T. Beltr\\'an, P. Caselli, R. Cesaroni, V. M. Rivilla","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2016-11-02T18:37:06Z","title":"On the chemical ladder of esters. Detection and formation of ethyl formate in the W51 e2 hot molecular core"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1611.00719","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":"sha256:97088c45bac96373882010cb170ab43498eec84a194f3f598203c3a957266979","target":"record","created_at":"2026-05-18T00:50:18Z","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":"7821442c088fe69dd8999fc422c12e6fce414632e584c5f3fe3f6c63e3779a3f","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2016-11-02T18:37:06Z","title_canon_sha256":"069d831ff0feff7868fc76255e1cbc36faa4d7cded3734a673f00e7a47b83379"},"schema_version":"1.0","source":{"id":"1611.00719","kind":"arxiv","version":1}},"canonical_sha256":"639facff51f40613443d6fc399d6763b88882ea7af488d8a1b4e2c47afac45da","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"639facff51f40613443d6fc399d6763b88882ea7af488d8a1b4e2c47afac45da","first_computed_at":"2026-05-18T00:50:18.331249Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:50:18.331249Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"Zc1MHKqt9FjNVDwOe6r/sQ87auj2Vil1smiorwgdGhVY8e/f81ECq2lxVrF2UVXj4eVvCenyoQLAXWc3fTL1Dw==","signature_status":"signed_v1","signed_at":"2026-05-18T00:50:18.331962Z","signed_message":"canonical_sha256_bytes"},"source_id":"1611.00719","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:97088c45bac96373882010cb170ab43498eec84a194f3f598203c3a957266979","sha256:006b63440ee9b10f7bc52c4b6d9bacb9c73291776a9e03eed5244b845b1c9205"],"state_sha256":"c99f0df2157f76a43ad71e7268d82f7dcce2d9f2f477270f92325ed357854cb9"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"CS7/9JQjO9jESwpRXt3JVd9Z5MQUwjw+UBN/S753yJAW8U4h9e6nG3/hVMiTz+Pv2hQsxtvu0B7T9KhJ4GTvAA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-19T09:07:58.952677Z","bundle_sha256":"8f10f4d8d8e3891de964ebb991178e6bbaceb4af730e02a44e82cd2dfdb446a1"}}