{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2020:XF77OVCUC3FX4P4IOLPMEJ3K4O","short_pith_number":"pith:XF77OVCU","canonical_record":{"source":{"id":"2006.12381","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"eess.SP","submitted_at":"2020-06-17T17:17:25Z","cross_cats_sorted":[],"title_canon_sha256":"dc59789b7171521e8e631f0f040dfbe5f08de783b6ee1df0885285f942018be8","abstract_canon_sha256":"365a34ec6401b8c5cec8f15a419e9e20032f35cc0a0712def7e62fd158b865b6"},"schema_version":"1.0"},"canonical_sha256":"b97ff7545416cb7e3f8872dec2276ae38f2c0334ecfc277bd5697cb58eddc964","source":{"kind":"arxiv","id":"2006.12381","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2006.12381","created_at":"2026-07-05T01:12:00Z"},{"alias_kind":"arxiv_version","alias_value":"2006.12381v1","created_at":"2026-07-05T01:12:00Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2006.12381","created_at":"2026-07-05T01:12:00Z"},{"alias_kind":"pith_short_12","alias_value":"XF77OVCUC3FX","created_at":"2026-07-05T01:12:00Z"},{"alias_kind":"pith_short_16","alias_value":"XF77OVCUC3FX4P4I","created_at":"2026-07-05T01:12:00Z"},{"alias_kind":"pith_short_8","alias_value":"XF77OVCU","created_at":"2026-07-05T01:12:00Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2020:XF77OVCUC3FX4P4IOLPMEJ3K4O","target":"record","payload":{"canonical_record":{"source":{"id":"2006.12381","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"eess.SP","submitted_at":"2020-06-17T17:17:25Z","cross_cats_sorted":[],"title_canon_sha256":"dc59789b7171521e8e631f0f040dfbe5f08de783b6ee1df0885285f942018be8","abstract_canon_sha256":"365a34ec6401b8c5cec8f15a419e9e20032f35cc0a0712def7e62fd158b865b6"},"schema_version":"1.0"},"canonical_sha256":"b97ff7545416cb7e3f8872dec2276ae38f2c0334ecfc277bd5697cb58eddc964","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T01:12:00.000489Z","signature_b64":"EGGe24ZR6XzS0FoM5LRxQ7SsuCCAVpw83MWozdAojkY6Ew11aIAs+NYLHO8ulHNXQdS4xGoJcB//SKiE2ECjCw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"b97ff7545416cb7e3f8872dec2276ae38f2c0334ecfc277bd5697cb58eddc964","last_reissued_at":"2026-07-05T01:12:00.000014Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T01:12:00.000014Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2006.12381","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":"2026-07-05T01:12:00Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"dqAvS0ZKPwfTwRkRtS1uwfns4degf2OwUrJ/VZ3AFew23FnILBnsTCyLaYhlVgolOISCx5YFSdjQdlYB8YmjCQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-20T09:10:32.868495Z"},"content_sha256":"1679d14a2bd817c5b9cf53932ff19ec385be0d7051d696ae6daa4f91e831e2e0","schema_version":"1.0","event_id":"sha256:1679d14a2bd817c5b9cf53932ff19ec385be0d7051d696ae6daa4f91e831e2e0"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2020:XF77OVCUC3FX4P4IOLPMEJ3K4O","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Calibration of chemical sensors in mobile wireless networks","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"eess.SP","authors_text":"Harsha Chenji, Radu Stoleru, Rakesh Gosangi, Ricardo Gutierrez-Osuna","submitted_at":"2020-06-17T17:17:25Z","abstract_excerpt":"Low-power chemical sensors deployed on mobile platforms make it possible to monitor pollutant concentrations across large urban areas. However, chemical sensors are prone to drift (e.g., aging, damage, poisoning) and have to be calibrated periodically. In this paper, we present an opportunistic calibration approach that relies on encounters between sensors; when in vicinity of each other, sensors exchange measurements and use the accumulated information to re-calibrate. We formulate the calibration process as weighted least-squares, where the most recent measurements are assigned the highest w"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2006.12381","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/2006.12381/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":"2026-07-05T01:12:00Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"r09iUOTDL9A6IQi+wTYXws3z4y6Xa3gJo5EnTjpu6RyJajEKl2HAPtugsJNilNoQDEO1tfSKTzRZl8+CdgzzCA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-20T09:10:32.869001Z"},"content_sha256":"0cc8ed5036fac0ccdd2b09de2fbb3ab2f6d1694e93436d7df2b9a93db15d93fc","schema_version":"1.0","event_id":"sha256:0cc8ed5036fac0ccdd2b09de2fbb3ab2f6d1694e93436d7df2b9a93db15d93fc"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/XF77OVCUC3FX4P4IOLPMEJ3K4O/bundle.json","state_url":"https://pith.science/pith/XF77OVCUC3FX4P4IOLPMEJ3K4O/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/XF77OVCUC3FX4P4IOLPMEJ3K4O/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":"2026-08-20T09:10:32Z","links":{"resolver":"https://pith.science/pith/XF77OVCUC3FX4P4IOLPMEJ3K4O","bundle":"https://pith.science/pith/XF77OVCUC3FX4P4IOLPMEJ3K4O/bundle.json","state":"https://pith.science/pith/XF77OVCUC3FX4P4IOLPMEJ3K4O/state.json","well_known_bundle":"https://pith.science/.well-known/pith/XF77OVCUC3FX4P4IOLPMEJ3K4O/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2020:XF77OVCUC3FX4P4IOLPMEJ3K4O","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":"365a34ec6401b8c5cec8f15a419e9e20032f35cc0a0712def7e62fd158b865b6","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"eess.SP","submitted_at":"2020-06-17T17:17:25Z","title_canon_sha256":"dc59789b7171521e8e631f0f040dfbe5f08de783b6ee1df0885285f942018be8"},"schema_version":"1.0","source":{"id":"2006.12381","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2006.12381","created_at":"2026-07-05T01:12:00Z"},{"alias_kind":"arxiv_version","alias_value":"2006.12381v1","created_at":"2026-07-05T01:12:00Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2006.12381","created_at":"2026-07-05T01:12:00Z"},{"alias_kind":"pith_short_12","alias_value":"XF77OVCUC3FX","created_at":"2026-07-05T01:12:00Z"},{"alias_kind":"pith_short_16","alias_value":"XF77OVCUC3FX4P4I","created_at":"2026-07-05T01:12:00Z"},{"alias_kind":"pith_short_8","alias_value":"XF77OVCU","created_at":"2026-07-05T01:12:00Z"}],"graph_snapshots":[{"event_id":"sha256:0cc8ed5036fac0ccdd2b09de2fbb3ab2f6d1694e93436d7df2b9a93db15d93fc","target":"graph","created_at":"2026-07-05T01:12:00Z","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/2006.12381/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"Low-power chemical sensors deployed on mobile platforms make it possible to monitor pollutant concentrations across large urban areas. However, chemical sensors are prone to drift (e.g., aging, damage, poisoning) and have to be calibrated periodically. In this paper, we present an opportunistic calibration approach that relies on encounters between sensors; when in vicinity of each other, sensors exchange measurements and use the accumulated information to re-calibrate. We formulate the calibration process as weighted least-squares, where the most recent measurements are assigned the highest w","authors_text":"Harsha Chenji, Radu Stoleru, Rakesh Gosangi, Ricardo Gutierrez-Osuna","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"eess.SP","submitted_at":"2020-06-17T17:17:25Z","title":"Calibration of chemical sensors in mobile wireless networks"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2006.12381","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":"sha256:1679d14a2bd817c5b9cf53932ff19ec385be0d7051d696ae6daa4f91e831e2e0","target":"record","created_at":"2026-07-05T01:12:00Z","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":"365a34ec6401b8c5cec8f15a419e9e20032f35cc0a0712def7e62fd158b865b6","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"eess.SP","submitted_at":"2020-06-17T17:17:25Z","title_canon_sha256":"dc59789b7171521e8e631f0f040dfbe5f08de783b6ee1df0885285f942018be8"},"schema_version":"1.0","source":{"id":"2006.12381","kind":"arxiv","version":1}},"canonical_sha256":"b97ff7545416cb7e3f8872dec2276ae38f2c0334ecfc277bd5697cb58eddc964","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"b97ff7545416cb7e3f8872dec2276ae38f2c0334ecfc277bd5697cb58eddc964","first_computed_at":"2026-07-05T01:12:00.000014Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T01:12:00.000014Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"EGGe24ZR6XzS0FoM5LRxQ7SsuCCAVpw83MWozdAojkY6Ew11aIAs+NYLHO8ulHNXQdS4xGoJcB//SKiE2ECjCw==","signature_status":"signed_v1","signed_at":"2026-07-05T01:12:00.000489Z","signed_message":"canonical_sha256_bytes"},"source_id":"2006.12381","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:1679d14a2bd817c5b9cf53932ff19ec385be0d7051d696ae6daa4f91e831e2e0","sha256:0cc8ed5036fac0ccdd2b09de2fbb3ab2f6d1694e93436d7df2b9a93db15d93fc"],"state_sha256":"be1c343eaf8e42296f52076cf37c45661653119444fe793425da8c623badb72c"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"6je/8vuKs1pN5pRRat3dJPx02LPtJc0EoMxectkVYWP0C14Zdv9E3KwjGtewXWHA/p8TwW9tJb6fb33KM6O3CQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-20T09:10:32.873693Z","bundle_sha256":"c24297e3e8280bf8785ba09bb702aaee18f9e1042ee715a325d840f248d7d74c"}}