{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2020:G5NDY2SAO6VC4SOSMWBDVQBA5N","short_pith_number":"pith:G5NDY2SA","canonical_record":{"source":{"id":"2003.10228","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"eess.SY","submitted_at":"2020-03-20T03:40:27Z","cross_cats_sorted":["cs.SY"],"title_canon_sha256":"02754d2117e516af4c24da6a7a838a81b1479547880b71fd22947f1f454b0475","abstract_canon_sha256":"1c4b874271237b0bdebc4993ae1eeb567b7fc11271a8a66eda14153b858aab0b"},"schema_version":"1.0"},"canonical_sha256":"375a3c6a4077aa2e49d265823ac020eb69697af0b31000d5af431f0e14790df6","source":{"kind":"arxiv","id":"2003.10228","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2003.10228","created_at":"2026-07-05T00:49:50Z"},{"alias_kind":"arxiv_version","alias_value":"2003.10228v1","created_at":"2026-07-05T00:49:50Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2003.10228","created_at":"2026-07-05T00:49:50Z"},{"alias_kind":"pith_short_12","alias_value":"G5NDY2SAO6VC","created_at":"2026-07-05T00:49:50Z"},{"alias_kind":"pith_short_16","alias_value":"G5NDY2SAO6VC4SOS","created_at":"2026-07-05T00:49:50Z"},{"alias_kind":"pith_short_8","alias_value":"G5NDY2SA","created_at":"2026-07-05T00:49:50Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2020:G5NDY2SAO6VC4SOSMWBDVQBA5N","target":"record","payload":{"canonical_record":{"source":{"id":"2003.10228","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"eess.SY","submitted_at":"2020-03-20T03:40:27Z","cross_cats_sorted":["cs.SY"],"title_canon_sha256":"02754d2117e516af4c24da6a7a838a81b1479547880b71fd22947f1f454b0475","abstract_canon_sha256":"1c4b874271237b0bdebc4993ae1eeb567b7fc11271a8a66eda14153b858aab0b"},"schema_version":"1.0"},"canonical_sha256":"375a3c6a4077aa2e49d265823ac020eb69697af0b31000d5af431f0e14790df6","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T00:49:50.801278Z","signature_b64":"aNnBZwzFZk0OXd/b42E4jdGS1QX2csaxF26MUN3eN55zjDTYTNNIkr6zhr/C1tMbiOqaq+Q8frU83GaybQSmAg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"375a3c6a4077aa2e49d265823ac020eb69697af0b31000d5af431f0e14790df6","last_reissued_at":"2026-07-05T00:49:50.800831Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T00:49:50.800831Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2003.10228","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":"2026-07-05T00:49:50Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"ru7juWJkQrv5IRbu3r2XJEFNE7F8mza+2ac8lQpZY0CRObSVKQfMYWrNyEx+PkTiXeiKaoKp0+Z6rETM+JCdBg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-10T21:15:51.756060Z"},"content_sha256":"ec5ff70323d836a9b93ea7d8af73c1111e49f16ca4dcde78a7023089bfaba5f7","schema_version":"1.0","event_id":"sha256:ec5ff70323d836a9b93ea7d8af73c1111e49f16ca4dcde78a7023089bfaba5f7"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2020:G5NDY2SAO6VC4SOSMWBDVQBA5N","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Estimating Lower Limb Kinematics using Distance Measurements with a Reduced Wearable Inertial Sensor Count","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["cs.SY"],"primary_cat":"eess.SY","authors_text":"Luke Sy, Nigel H. Lovell, Stephen J. Redmond","submitted_at":"2020-03-20T03:40:27Z","abstract_excerpt":"This paper presents an algorithm that makes novel use of distance measurements alongside a constrained Kalman filter to accurately estimate pelvis, thigh, and shank kinematics for both legs during walking and other body movements using only three wearable inertial measurement units (IMUs). The distance measurement formulation also assumes hinge knee joint and constant body segment length, helping produce estimates that are near or in the constraint space for better estimator stability. Simulated experiments shown that inter-IMU distance measurement is indeed a promising new source of informati"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2003.10228","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/2003.10228/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":"2026-07-05T00:49:50Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"EbF4nTUaxyLxCXXE4iKNOzJg03bXEJUeWpUUvWijJxfBSlNukiGbZf9tfE32I5y+xT7CiRwE8NVCkyieES/OCQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-10T21:15:51.756460Z"},"content_sha256":"2e52e397a34690e6cd3b229bb1a85216c9275bdd01661c337e558999de6b13ca","schema_version":"1.0","event_id":"sha256:2e52e397a34690e6cd3b229bb1a85216c9275bdd01661c337e558999de6b13ca"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/G5NDY2SAO6VC4SOSMWBDVQBA5N/bundle.json","state_url":"https://pith.science/pith/G5NDY2SAO6VC4SOSMWBDVQBA5N/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/G5NDY2SAO6VC4SOSMWBDVQBA5N/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":"2026-07-10T21:15:51Z","links":{"resolver":"https://pith.science/pith/G5NDY2SAO6VC4SOSMWBDVQBA5N","bundle":"https://pith.science/pith/G5NDY2SAO6VC4SOSMWBDVQBA5N/bundle.json","state":"https://pith.science/pith/G5NDY2SAO6VC4SOSMWBDVQBA5N/state.json","well_known_bundle":"https://pith.science/.well-known/pith/G5NDY2SAO6VC4SOSMWBDVQBA5N/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2020:G5NDY2SAO6VC4SOSMWBDVQBA5N","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":"1c4b874271237b0bdebc4993ae1eeb567b7fc11271a8a66eda14153b858aab0b","cross_cats_sorted":["cs.SY"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"eess.SY","submitted_at":"2020-03-20T03:40:27Z","title_canon_sha256":"02754d2117e516af4c24da6a7a838a81b1479547880b71fd22947f1f454b0475"},"schema_version":"1.0","source":{"id":"2003.10228","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2003.10228","created_at":"2026-07-05T00:49:50Z"},{"alias_kind":"arxiv_version","alias_value":"2003.10228v1","created_at":"2026-07-05T00:49:50Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2003.10228","created_at":"2026-07-05T00:49:50Z"},{"alias_kind":"pith_short_12","alias_value":"G5NDY2SAO6VC","created_at":"2026-07-05T00:49:50Z"},{"alias_kind":"pith_short_16","alias_value":"G5NDY2SAO6VC4SOS","created_at":"2026-07-05T00:49:50Z"},{"alias_kind":"pith_short_8","alias_value":"G5NDY2SA","created_at":"2026-07-05T00:49:50Z"}],"graph_snapshots":[{"event_id":"sha256:2e52e397a34690e6cd3b229bb1a85216c9275bdd01661c337e558999de6b13ca","target":"graph","created_at":"2026-07-05T00:49:50Z","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/2003.10228/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"This paper presents an algorithm that makes novel use of distance measurements alongside a constrained Kalman filter to accurately estimate pelvis, thigh, and shank kinematics for both legs during walking and other body movements using only three wearable inertial measurement units (IMUs). The distance measurement formulation also assumes hinge knee joint and constant body segment length, helping produce estimates that are near or in the constraint space for better estimator stability. Simulated experiments shown that inter-IMU distance measurement is indeed a promising new source of informati","authors_text":"Luke Sy, Nigel H. Lovell, Stephen J. Redmond","cross_cats":["cs.SY"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"eess.SY","submitted_at":"2020-03-20T03:40:27Z","title":"Estimating Lower Limb Kinematics using Distance Measurements with a Reduced Wearable Inertial Sensor Count"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2003.10228","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:ec5ff70323d836a9b93ea7d8af73c1111e49f16ca4dcde78a7023089bfaba5f7","target":"record","created_at":"2026-07-05T00:49:50Z","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":"1c4b874271237b0bdebc4993ae1eeb567b7fc11271a8a66eda14153b858aab0b","cross_cats_sorted":["cs.SY"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"eess.SY","submitted_at":"2020-03-20T03:40:27Z","title_canon_sha256":"02754d2117e516af4c24da6a7a838a81b1479547880b71fd22947f1f454b0475"},"schema_version":"1.0","source":{"id":"2003.10228","kind":"arxiv","version":1}},"canonical_sha256":"375a3c6a4077aa2e49d265823ac020eb69697af0b31000d5af431f0e14790df6","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"375a3c6a4077aa2e49d265823ac020eb69697af0b31000d5af431f0e14790df6","first_computed_at":"2026-07-05T00:49:50.800831Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T00:49:50.800831Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"aNnBZwzFZk0OXd/b42E4jdGS1QX2csaxF26MUN3eN55zjDTYTNNIkr6zhr/C1tMbiOqaq+Q8frU83GaybQSmAg==","signature_status":"signed_v1","signed_at":"2026-07-05T00:49:50.801278Z","signed_message":"canonical_sha256_bytes"},"source_id":"2003.10228","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:ec5ff70323d836a9b93ea7d8af73c1111e49f16ca4dcde78a7023089bfaba5f7","sha256:2e52e397a34690e6cd3b229bb1a85216c9275bdd01661c337e558999de6b13ca"],"state_sha256":"216599db673f1c894f4e8a3e6916d4319d21f3f7c5a58214aa54c1f67c0f6b07"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"NZpv2ac9R+pnKWGCMaMQ+5gNrcvpT+hGJSmpTVHbaiseZ4JEb94lFR7/zzKl0zEc67HaPbBySxMjSg2gh81MAw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-07-10T21:15:51.758624Z","bundle_sha256":"e97939f1608b46cea1540b0b943faa8574c075f4d269daa8c2a9eb84bbc651d5"}}