{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2021:5NU2Q4KKMQZPYJJCRQ3VD27FVR","short_pith_number":"pith:5NU2Q4KK","canonical_record":{"source":{"id":"2101.03523","kind":"arxiv","version":3},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"physics.ao-ph","submitted_at":"2021-01-10T11:07:52Z","cross_cats_sorted":[],"title_canon_sha256":"cc43bff95ba771965b5f920347394c90aa8d1ed9305d8bb7793aec3a995f5bf5","abstract_canon_sha256":"68d4f7a5e7cf2c51fff70d0aca156f43de216fe6239f6db61bbbe10206c35c82"},"schema_version":"1.0"},"canonical_sha256":"eb69a8714a6432fc25228c3751ebe5ac79186df56f2b4caebae05d7e042b3f4f","source":{"kind":"arxiv","id":"2101.03523","version":3},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2101.03523","created_at":"2026-07-05T02:28:55Z"},{"alias_kind":"arxiv_version","alias_value":"2101.03523v3","created_at":"2026-07-05T02:28:55Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2101.03523","created_at":"2026-07-05T02:28:55Z"},{"alias_kind":"pith_short_12","alias_value":"5NU2Q4KKMQZP","created_at":"2026-07-05T02:28:55Z"},{"alias_kind":"pith_short_16","alias_value":"5NU2Q4KKMQZPYJJC","created_at":"2026-07-05T02:28:55Z"},{"alias_kind":"pith_short_8","alias_value":"5NU2Q4KK","created_at":"2026-07-05T02:28:55Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2021:5NU2Q4KKMQZPYJJCRQ3VD27FVR","target":"record","payload":{"canonical_record":{"source":{"id":"2101.03523","kind":"arxiv","version":3},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"physics.ao-ph","submitted_at":"2021-01-10T11:07:52Z","cross_cats_sorted":[],"title_canon_sha256":"cc43bff95ba771965b5f920347394c90aa8d1ed9305d8bb7793aec3a995f5bf5","abstract_canon_sha256":"68d4f7a5e7cf2c51fff70d0aca156f43de216fe6239f6db61bbbe10206c35c82"},"schema_version":"1.0"},"canonical_sha256":"eb69a8714a6432fc25228c3751ebe5ac79186df56f2b4caebae05d7e042b3f4f","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T02:28:55.065862Z","signature_b64":"H28XhEKBONAMEvYFqVQFl0gaAtaVqbXeqO3LhZIdw+IJ+89Kqx7+eSPTzVVO4z1EtbIdEjIFRlaEApD1B7g5Bg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"eb69a8714a6432fc25228c3751ebe5ac79186df56f2b4caebae05d7e042b3f4f","last_reissued_at":"2026-07-05T02:28:55.065339Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T02:28:55.065339Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2101.03523","source_version":3,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-07-05T02:28:55Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"zw7WU7J9JgqGiHCNDrWNB8m36GV38ix1j6iXJU4m/NlsAozG2NFAMVUIx9vgyEYs/ANI6hO08X7mGBQATn63Ag==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-17T12:37:11.199625Z"},"content_sha256":"d3dfffc007a0e94b2bc43c45920dc2611e6547484a0a94228035a4a06b7f627c","schema_version":"1.0","event_id":"sha256:d3dfffc007a0e94b2bc43c45920dc2611e6547484a0a94228035a4a06b7f627c"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2021:5NU2Q4KKMQZPYJJCRQ3VD27FVR","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Quantifying COVID-19 enforced global changes in atmospheric pollutants using cloud computing based remote sensing","license":"http://creativecommons.org/licenses/by/4.0/","headline":"","cross_cats":[],"primary_cat":"physics.ao-ph","authors_text":"Badimela Upendra, Bhupendra Bahadur Singh, Manmeet Singh, Mriganka Sekhar Biswas, Raunaq Singh, Rupinder Kaur, Sukhpal Singh Gill","submitted_at":"2021-01-10T11:07:52Z","abstract_excerpt":"Global lockdowns in response to the COVID-19 pandemic have led to changes in the anthropogenic activities resulting in perceivable air quality improvements. Although several recent studies have analyzed these changes over different regions of the globe, these analyses have been constrained due to the usage of station-based data which is mostly limited upto the metropolitan cities. Also, the quantifiable changes have been reported only for the developed and developing regions leaving the poor economies (e.g. Africa) due to the shortage of in-situ data. Using a comprehensive set of high spatiote"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2101.03523","kind":"arxiv","version":3},"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/2101.03523/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":"2026-07-05T02:28:55Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"DFOazGAnNCzwMO5RkT+wut7aIhNAedx4H7laYdQaiokiHiP77aEEu7GuL1DflbL5Oth2Z5HtX5KddvjqVFPmBg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-17T12:37:11.200507Z"},"content_sha256":"36607dddf4736f8e522c28e654b3fc5a3f4560696ba5781adda7706e28834932","schema_version":"1.0","event_id":"sha256:36607dddf4736f8e522c28e654b3fc5a3f4560696ba5781adda7706e28834932"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/5NU2Q4KKMQZPYJJCRQ3VD27FVR/bundle.json","state_url":"https://pith.science/pith/5NU2Q4KKMQZPYJJCRQ3VD27FVR/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/5NU2Q4KKMQZPYJJCRQ3VD27FVR/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":"2026-08-17T12:37:11Z","links":{"resolver":"https://pith.science/pith/5NU2Q4KKMQZPYJJCRQ3VD27FVR","bundle":"https://pith.science/pith/5NU2Q4KKMQZPYJJCRQ3VD27FVR/bundle.json","state":"https://pith.science/pith/5NU2Q4KKMQZPYJJCRQ3VD27FVR/state.json","well_known_bundle":"https://pith.science/.well-known/pith/5NU2Q4KKMQZPYJJCRQ3VD27FVR/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2021:5NU2Q4KKMQZPYJJCRQ3VD27FVR","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":"68d4f7a5e7cf2c51fff70d0aca156f43de216fe6239f6db61bbbe10206c35c82","cross_cats_sorted":[],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"physics.ao-ph","submitted_at":"2021-01-10T11:07:52Z","title_canon_sha256":"cc43bff95ba771965b5f920347394c90aa8d1ed9305d8bb7793aec3a995f5bf5"},"schema_version":"1.0","source":{"id":"2101.03523","kind":"arxiv","version":3}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2101.03523","created_at":"2026-07-05T02:28:55Z"},{"alias_kind":"arxiv_version","alias_value":"2101.03523v3","created_at":"2026-07-05T02:28:55Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2101.03523","created_at":"2026-07-05T02:28:55Z"},{"alias_kind":"pith_short_12","alias_value":"5NU2Q4KKMQZP","created_at":"2026-07-05T02:28:55Z"},{"alias_kind":"pith_short_16","alias_value":"5NU2Q4KKMQZPYJJC","created_at":"2026-07-05T02:28:55Z"},{"alias_kind":"pith_short_8","alias_value":"5NU2Q4KK","created_at":"2026-07-05T02:28:55Z"}],"graph_snapshots":[{"event_id":"sha256:36607dddf4736f8e522c28e654b3fc5a3f4560696ba5781adda7706e28834932","target":"graph","created_at":"2026-07-05T02:28:55Z","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/2101.03523/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"Global lockdowns in response to the COVID-19 pandemic have led to changes in the anthropogenic activities resulting in perceivable air quality improvements. Although several recent studies have analyzed these changes over different regions of the globe, these analyses have been constrained due to the usage of station-based data which is mostly limited upto the metropolitan cities. Also, the quantifiable changes have been reported only for the developed and developing regions leaving the poor economies (e.g. Africa) due to the shortage of in-situ data. Using a comprehensive set of high spatiote","authors_text":"Badimela Upendra, Bhupendra Bahadur Singh, Manmeet Singh, Mriganka Sekhar Biswas, Raunaq Singh, Rupinder Kaur, Sukhpal Singh Gill","cross_cats":[],"headline":"","license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"physics.ao-ph","submitted_at":"2021-01-10T11:07:52Z","title":"Quantifying COVID-19 enforced global changes in atmospheric pollutants using cloud computing based remote sensing"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2101.03523","kind":"arxiv","version":3},"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:d3dfffc007a0e94b2bc43c45920dc2611e6547484a0a94228035a4a06b7f627c","target":"record","created_at":"2026-07-05T02:28:55Z","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":"68d4f7a5e7cf2c51fff70d0aca156f43de216fe6239f6db61bbbe10206c35c82","cross_cats_sorted":[],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"physics.ao-ph","submitted_at":"2021-01-10T11:07:52Z","title_canon_sha256":"cc43bff95ba771965b5f920347394c90aa8d1ed9305d8bb7793aec3a995f5bf5"},"schema_version":"1.0","source":{"id":"2101.03523","kind":"arxiv","version":3}},"canonical_sha256":"eb69a8714a6432fc25228c3751ebe5ac79186df56f2b4caebae05d7e042b3f4f","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"eb69a8714a6432fc25228c3751ebe5ac79186df56f2b4caebae05d7e042b3f4f","first_computed_at":"2026-07-05T02:28:55.065339Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T02:28:55.065339Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"H28XhEKBONAMEvYFqVQFl0gaAtaVqbXeqO3LhZIdw+IJ+89Kqx7+eSPTzVVO4z1EtbIdEjIFRlaEApD1B7g5Bg==","signature_status":"signed_v1","signed_at":"2026-07-05T02:28:55.065862Z","signed_message":"canonical_sha256_bytes"},"source_id":"2101.03523","source_kind":"arxiv","source_version":3}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:d3dfffc007a0e94b2bc43c45920dc2611e6547484a0a94228035a4a06b7f627c","sha256:36607dddf4736f8e522c28e654b3fc5a3f4560696ba5781adda7706e28834932"],"state_sha256":"371f783abd8bc4dffa833c56e421e08f0d9d333609659e60e39e56571c0deb6f"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"dG2trOAAwVevg34CEFFQhKxfo/s5QiWM6PkNoGUSZN8wBP3gSdReRPhutSH6KUtgaT1DpgjPCZXMVpyk8qyKDw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-17T12:37:11.239501Z","bundle_sha256":"26220bfa12e59556bf76bab4c82ea8ea4f9ddae564a635fd757229bac75f13d1"}}