{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2021:VLZLSGID36U5E73UZEKMFN3VEP","short_pith_number":"pith:VLZLSGID","canonical_record":{"source":{"id":"2104.14990","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"physics.ao-ph","submitted_at":"2021-04-30T13:25:08Z","cross_cats_sorted":[],"title_canon_sha256":"b7ac236a5ad7e9fc7efae6e917b424e5ccb65094fe758cb8ccc94dc68b5b343e","abstract_canon_sha256":"30b854438cdd4c5652c9a5dd373027a3bca8883196a5df4987d8877f4da9efdc"},"schema_version":"1.0"},"canonical_sha256":"aaf2b91903dfa9d27f74c914c2b77523f9c93a8b763804e5fb195003078c8a4a","source":{"kind":"arxiv","id":"2104.14990","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2104.14990","created_at":"2026-07-05T02:36:28Z"},{"alias_kind":"arxiv_version","alias_value":"2104.14990v1","created_at":"2026-07-05T02:36:28Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2104.14990","created_at":"2026-07-05T02:36:28Z"},{"alias_kind":"pith_short_12","alias_value":"VLZLSGID36U5","created_at":"2026-07-05T02:36:28Z"},{"alias_kind":"pith_short_16","alias_value":"VLZLSGID36U5E73U","created_at":"2026-07-05T02:36:28Z"},{"alias_kind":"pith_short_8","alias_value":"VLZLSGID","created_at":"2026-07-05T02:36:28Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2021:VLZLSGID36U5E73UZEKMFN3VEP","target":"record","payload":{"canonical_record":{"source":{"id":"2104.14990","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"physics.ao-ph","submitted_at":"2021-04-30T13:25:08Z","cross_cats_sorted":[],"title_canon_sha256":"b7ac236a5ad7e9fc7efae6e917b424e5ccb65094fe758cb8ccc94dc68b5b343e","abstract_canon_sha256":"30b854438cdd4c5652c9a5dd373027a3bca8883196a5df4987d8877f4da9efdc"},"schema_version":"1.0"},"canonical_sha256":"aaf2b91903dfa9d27f74c914c2b77523f9c93a8b763804e5fb195003078c8a4a","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T02:36:28.953209Z","signature_b64":"/DWmEjQs+vJ3tA6VblnO+2Lfq4/kIqfWhrjxU7RcQfbHEmQWexFY7wmpunsK/cmpk7KYr35GTOJbD8x3ZYIZBg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"aaf2b91903dfa9d27f74c914c2b77523f9c93a8b763804e5fb195003078c8a4a","last_reissued_at":"2026-07-05T02:36:28.952832Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T02:36:28.952832Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2104.14990","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":"2026-07-05T02:36:28Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"9wDBqCv0eRffWn/8xrkVzUF3fAaRBkNkw8RaGzNUNxSrJqdf2Xxsxmv5fm9C2lwKqfVkdWXrMe18AVeZizvtDA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-09T05:01:52.237086Z"},"content_sha256":"09d953218f3048d1fddbd3c7f0d2c115842f1674b52b4957358fc400b9a0287e","schema_version":"1.0","event_id":"sha256:09d953218f3048d1fddbd3c7f0d2c115842f1674b52b4957358fc400b9a0287e"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2021:VLZLSGID36U5E73UZEKMFN3VEP","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Impact of lockdowns and winter temperatures on natural gas consumption in Europe","license":"http://creativecommons.org/licenses/by/4.0/","headline":"","cross_cats":[],"primary_cat":"physics.ao-ph","authors_text":"Chaopeng Hong, Fran\\c{c}ois-Marie Br\\'eon, Ivan Janssens, Josep Penuelas, Katsumasa Tanaka1, L\\'ena Gurriaran, Michael Obersteiner, Philippe Ciais, Steven Davis, Stijn Dellaert, Yann Fran\\c{c}oise, Yilong Wang, Zhu Deng, Zhu Liu","submitted_at":"2021-04-30T13:25:08Z","abstract_excerpt":"As the COVID-19 virus spread over the world, governments restricted mobility to slow transmission. Public health measures had different intensities across European countries but all had significant impact on peoples daily lives and economic activities, causing a drop of CO2 emissions of about 10% for the whole year 2020. Here, we analyze changes in natural gas use in the industry and built environment sectors during the first half of year 2020 with daily gas flows data from pipeline and storage facilities in Europe. We find that reductions of industrial gas use reflect decreases in industrial "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2104.14990","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":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/2104.14990/integrity.json","findings":[],"available":true,"detectors_run":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938"},"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":"2026-07-05T02:36:28Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"VJroukJBjXcEjytaHgpUquO9wkuiTd9taxjdc/vXkGt8m0G4f8iuIsB9vh4Qx0dETNS/fIz5LaKg30Blqm52CA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-09T05:01:52.237466Z"},"content_sha256":"cc794b41755bf6b0aba158eecc97e28ef9de27e3e8eba5b19621212a968af48d","schema_version":"1.0","event_id":"sha256:cc794b41755bf6b0aba158eecc97e28ef9de27e3e8eba5b19621212a968af48d"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/VLZLSGID36U5E73UZEKMFN3VEP/bundle.json","state_url":"https://pith.science/pith/VLZLSGID36U5E73UZEKMFN3VEP/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/VLZLSGID36U5E73UZEKMFN3VEP/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":"2026-07-09T05:01:52Z","links":{"resolver":"https://pith.science/pith/VLZLSGID36U5E73UZEKMFN3VEP","bundle":"https://pith.science/pith/VLZLSGID36U5E73UZEKMFN3VEP/bundle.json","state":"https://pith.science/pith/VLZLSGID36U5E73UZEKMFN3VEP/state.json","well_known_bundle":"https://pith.science/.well-known/pith/VLZLSGID36U5E73UZEKMFN3VEP/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2021:VLZLSGID36U5E73UZEKMFN3VEP","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":"30b854438cdd4c5652c9a5dd373027a3bca8883196a5df4987d8877f4da9efdc","cross_cats_sorted":[],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"physics.ao-ph","submitted_at":"2021-04-30T13:25:08Z","title_canon_sha256":"b7ac236a5ad7e9fc7efae6e917b424e5ccb65094fe758cb8ccc94dc68b5b343e"},"schema_version":"1.0","source":{"id":"2104.14990","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2104.14990","created_at":"2026-07-05T02:36:28Z"},{"alias_kind":"arxiv_version","alias_value":"2104.14990v1","created_at":"2026-07-05T02:36:28Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2104.14990","created_at":"2026-07-05T02:36:28Z"},{"alias_kind":"pith_short_12","alias_value":"VLZLSGID36U5","created_at":"2026-07-05T02:36:28Z"},{"alias_kind":"pith_short_16","alias_value":"VLZLSGID36U5E73U","created_at":"2026-07-05T02:36:28Z"},{"alias_kind":"pith_short_8","alias_value":"VLZLSGID","created_at":"2026-07-05T02:36:28Z"}],"graph_snapshots":[{"event_id":"sha256:cc794b41755bf6b0aba158eecc97e28ef9de27e3e8eba5b19621212a968af48d","target":"graph","created_at":"2026-07-05T02:36:28Z","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"},"integrity":{"available":true,"clean":true,"detectors_run":[],"endpoint":"/pith/2104.14990/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"As the COVID-19 virus spread over the world, governments restricted mobility to slow transmission. Public health measures had different intensities across European countries but all had significant impact on peoples daily lives and economic activities, causing a drop of CO2 emissions of about 10% for the whole year 2020. Here, we analyze changes in natural gas use in the industry and built environment sectors during the first half of year 2020 with daily gas flows data from pipeline and storage facilities in Europe. We find that reductions of industrial gas use reflect decreases in industrial ","authors_text":"Chaopeng Hong, Fran\\c{c}ois-Marie Br\\'eon, Ivan Janssens, Josep Penuelas, Katsumasa Tanaka1, L\\'ena Gurriaran, Michael Obersteiner, Philippe Ciais, Steven Davis, Stijn Dellaert, Yann Fran\\c{c}oise, Yilong Wang, Zhu Deng, Zhu Liu","cross_cats":[],"headline":"","license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"physics.ao-ph","submitted_at":"2021-04-30T13:25:08Z","title":"Impact of lockdowns and winter temperatures on natural gas consumption in Europe"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2104.14990","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":"sha256:09d953218f3048d1fddbd3c7f0d2c115842f1674b52b4957358fc400b9a0287e","target":"record","created_at":"2026-07-05T02:36:28Z","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":"30b854438cdd4c5652c9a5dd373027a3bca8883196a5df4987d8877f4da9efdc","cross_cats_sorted":[],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"physics.ao-ph","submitted_at":"2021-04-30T13:25:08Z","title_canon_sha256":"b7ac236a5ad7e9fc7efae6e917b424e5ccb65094fe758cb8ccc94dc68b5b343e"},"schema_version":"1.0","source":{"id":"2104.14990","kind":"arxiv","version":1}},"canonical_sha256":"aaf2b91903dfa9d27f74c914c2b77523f9c93a8b763804e5fb195003078c8a4a","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"aaf2b91903dfa9d27f74c914c2b77523f9c93a8b763804e5fb195003078c8a4a","first_computed_at":"2026-07-05T02:36:28.952832Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T02:36:28.952832Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"/DWmEjQs+vJ3tA6VblnO+2Lfq4/kIqfWhrjxU7RcQfbHEmQWexFY7wmpunsK/cmpk7KYr35GTOJbD8x3ZYIZBg==","signature_status":"signed_v1","signed_at":"2026-07-05T02:36:28.953209Z","signed_message":"canonical_sha256_bytes"},"source_id":"2104.14990","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:09d953218f3048d1fddbd3c7f0d2c115842f1674b52b4957358fc400b9a0287e","sha256:cc794b41755bf6b0aba158eecc97e28ef9de27e3e8eba5b19621212a968af48d"],"state_sha256":"8342ce2cd89382a832ec11aa11567e49be64e4ac18945bffa0442cea2d8770d5"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"T4Ug26ggo6O/55EnGCgYdB/LUP/gPnYELPyw2pgzaC7MtRLanAJvUx5P2RDfIHN+44+Xx2JaRkxgWY8iik7fCQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-07-09T05:01:52.239422Z","bundle_sha256":"e00f53e7e88c3da5dc055989083bc9d1fcc26287b9879d84166aae01bc679d6c"}}