{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2022:ET4GQVOE5RKACW7OFNUOEPVVBO","short_pith_number":"pith:ET4GQVOE","canonical_record":{"source":{"id":"2203.10553","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.HC","submitted_at":"2022-03-20T13:46:26Z","cross_cats_sorted":[],"title_canon_sha256":"e7517d1431a5d700a9b8e0b23a22ae8231406843ecf1c471b0ab0147fa686f2e","abstract_canon_sha256":"8778199fc1a53d86ef9efc51a4b84cd31aafc2df2352cb999d3362a6df0989fa"},"schema_version":"1.0"},"canonical_sha256":"24f86855c4ec54015bee2b68e23eb50b85c348d88f4df6271cfbf4c80f3d27db","source":{"kind":"arxiv","id":"2203.10553","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2203.10553","created_at":"2026-07-05T04:06:54Z"},{"alias_kind":"arxiv_version","alias_value":"2203.10553v1","created_at":"2026-07-05T04:06:54Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2203.10553","created_at":"2026-07-05T04:06:54Z"},{"alias_kind":"pith_short_12","alias_value":"ET4GQVOE5RKA","created_at":"2026-07-05T04:06:54Z"},{"alias_kind":"pith_short_16","alias_value":"ET4GQVOE5RKACW7O","created_at":"2026-07-05T04:06:54Z"},{"alias_kind":"pith_short_8","alias_value":"ET4GQVOE","created_at":"2026-07-05T04:06:54Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2022:ET4GQVOE5RKACW7OFNUOEPVVBO","target":"record","payload":{"canonical_record":{"source":{"id":"2203.10553","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.HC","submitted_at":"2022-03-20T13:46:26Z","cross_cats_sorted":[],"title_canon_sha256":"e7517d1431a5d700a9b8e0b23a22ae8231406843ecf1c471b0ab0147fa686f2e","abstract_canon_sha256":"8778199fc1a53d86ef9efc51a4b84cd31aafc2df2352cb999d3362a6df0989fa"},"schema_version":"1.0"},"canonical_sha256":"24f86855c4ec54015bee2b68e23eb50b85c348d88f4df6271cfbf4c80f3d27db","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T04:06:54.320332Z","signature_b64":"kUB185nA+1aGDJAaUnRByGE2mzc0J77b3C4Ge7LcRz//PikFbcd31et10FfbQ3v+FMzGAwDsCoWwx2aVvpkRBg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"24f86855c4ec54015bee2b68e23eb50b85c348d88f4df6271cfbf4c80f3d27db","last_reissued_at":"2026-07-05T04:06:54.319907Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T04:06:54.319907Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2203.10553","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":"2026-07-05T04:06:54Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"w9SAkTPOkDkr5eWGvc0ZLlMMsH42TXSmGE9A2SZqq295Oe+FUBKoPNqh+35lFRCMB0YwhojdUKg3FckRtzPoAg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-31T16:15:39.315116Z"},"content_sha256":"dcf369ba9863a68858e26e8837ae494c6c72c0abb39d8f6667ab90df1d5d2884","schema_version":"1.0","event_id":"sha256:dcf369ba9863a68858e26e8837ae494c6c72c0abb39d8f6667ab90df1d5d2884"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2022:ET4GQVOE5RKACW7OFNUOEPVVBO","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"FaceOri: Tracking Head Position and Orientation Using Ultrasonic Ranging on Earphones","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"cs.HC","authors_text":"Farshid Salemi Parizi, Ishan Chatterjee, Jiexin Ding, Shwetak Patel, Yuanchun Shi, Yukang Yan, Yuntao Wang, Yuzhou Zhuang","submitted_at":"2022-03-20T13:46:26Z","abstract_excerpt":"Face orientation can often indicate users' intended interaction target. In this paper, we propose FaceOri, a novel face tracking technique based on acoustic ranging using earphones. FaceOri can leverage the speaker on a commodity device to emit an ultrasonic chirp, which is picked up by the set of microphones on the user's earphone, and then processed to calculate the distance from each microphone to the device. These measurements are used to derive the user's face orientation and distance with respect to the device. We conduct a ground truth comparison and user study to evaluate FaceOri's per"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2203.10553","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/2203.10553/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":"2026-07-05T04:06:54Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"QBvVyBhH0opBEHFROy5zZShRvCOPlNodeXB2Hu9k9fB7xW4lgDo5RTB/MjtIZ6fFDgrQXUOkIGxCa5+J1E2lDw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-31T16:15:39.315414Z"},"content_sha256":"d9642dd86da4f476bad30fde2720fbb1f0798cd0a4a6935e8a5cfbc0bac7c42c","schema_version":"1.0","event_id":"sha256:d9642dd86da4f476bad30fde2720fbb1f0798cd0a4a6935e8a5cfbc0bac7c42c"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/ET4GQVOE5RKACW7OFNUOEPVVBO/bundle.json","state_url":"https://pith.science/pith/ET4GQVOE5RKACW7OFNUOEPVVBO/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/ET4GQVOE5RKACW7OFNUOEPVVBO/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":"2026-07-31T16:15:39Z","links":{"resolver":"https://pith.science/pith/ET4GQVOE5RKACW7OFNUOEPVVBO","bundle":"https://pith.science/pith/ET4GQVOE5RKACW7OFNUOEPVVBO/bundle.json","state":"https://pith.science/pith/ET4GQVOE5RKACW7OFNUOEPVVBO/state.json","well_known_bundle":"https://pith.science/.well-known/pith/ET4GQVOE5RKACW7OFNUOEPVVBO/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2022:ET4GQVOE5RKACW7OFNUOEPVVBO","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":"8778199fc1a53d86ef9efc51a4b84cd31aafc2df2352cb999d3362a6df0989fa","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.HC","submitted_at":"2022-03-20T13:46:26Z","title_canon_sha256":"e7517d1431a5d700a9b8e0b23a22ae8231406843ecf1c471b0ab0147fa686f2e"},"schema_version":"1.0","source":{"id":"2203.10553","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2203.10553","created_at":"2026-07-05T04:06:54Z"},{"alias_kind":"arxiv_version","alias_value":"2203.10553v1","created_at":"2026-07-05T04:06:54Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2203.10553","created_at":"2026-07-05T04:06:54Z"},{"alias_kind":"pith_short_12","alias_value":"ET4GQVOE5RKA","created_at":"2026-07-05T04:06:54Z"},{"alias_kind":"pith_short_16","alias_value":"ET4GQVOE5RKACW7O","created_at":"2026-07-05T04:06:54Z"},{"alias_kind":"pith_short_8","alias_value":"ET4GQVOE","created_at":"2026-07-05T04:06:54Z"}],"graph_snapshots":[{"event_id":"sha256:d9642dd86da4f476bad30fde2720fbb1f0798cd0a4a6935e8a5cfbc0bac7c42c","target":"graph","created_at":"2026-07-05T04:06:54Z","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/2203.10553/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"Face orientation can often indicate users' intended interaction target. In this paper, we propose FaceOri, a novel face tracking technique based on acoustic ranging using earphones. FaceOri can leverage the speaker on a commodity device to emit an ultrasonic chirp, which is picked up by the set of microphones on the user's earphone, and then processed to calculate the distance from each microphone to the device. These measurements are used to derive the user's face orientation and distance with respect to the device. We conduct a ground truth comparison and user study to evaluate FaceOri's per","authors_text":"Farshid Salemi Parizi, Ishan Chatterjee, Jiexin Ding, Shwetak Patel, Yuanchun Shi, Yukang Yan, Yuntao Wang, Yuzhou Zhuang","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.HC","submitted_at":"2022-03-20T13:46:26Z","title":"FaceOri: Tracking Head Position and Orientation Using Ultrasonic Ranging on Earphones"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2203.10553","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:dcf369ba9863a68858e26e8837ae494c6c72c0abb39d8f6667ab90df1d5d2884","target":"record","created_at":"2026-07-05T04:06:54Z","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":"8778199fc1a53d86ef9efc51a4b84cd31aafc2df2352cb999d3362a6df0989fa","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.HC","submitted_at":"2022-03-20T13:46:26Z","title_canon_sha256":"e7517d1431a5d700a9b8e0b23a22ae8231406843ecf1c471b0ab0147fa686f2e"},"schema_version":"1.0","source":{"id":"2203.10553","kind":"arxiv","version":1}},"canonical_sha256":"24f86855c4ec54015bee2b68e23eb50b85c348d88f4df6271cfbf4c80f3d27db","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"24f86855c4ec54015bee2b68e23eb50b85c348d88f4df6271cfbf4c80f3d27db","first_computed_at":"2026-07-05T04:06:54.319907Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T04:06:54.319907Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"kUB185nA+1aGDJAaUnRByGE2mzc0J77b3C4Ge7LcRz//PikFbcd31et10FfbQ3v+FMzGAwDsCoWwx2aVvpkRBg==","signature_status":"signed_v1","signed_at":"2026-07-05T04:06:54.320332Z","signed_message":"canonical_sha256_bytes"},"source_id":"2203.10553","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:dcf369ba9863a68858e26e8837ae494c6c72c0abb39d8f6667ab90df1d5d2884","sha256:d9642dd86da4f476bad30fde2720fbb1f0798cd0a4a6935e8a5cfbc0bac7c42c"],"state_sha256":"f91da54663bfc2d57038a3efc16c0bfb4698b3a0ab15ee7c9f342da9d62aba81"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"iLZmJlpERTHfYko2haKAsYLqDgpYBAMiOjjudWc3m6vfqmCMOYVNpAlHuj0noofNnVINJ4OdIzPnipMITK4QAg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-07-31T16:15:39.320087Z","bundle_sha256":"99b661a9de65355691c8a46c4fafd75bbf4a07e8ada9ac765e649fcc7b9701f7"}}