{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2018:KYEXINLGEZLXH5CFKHVORSPOGD","short_pith_number":"pith:KYEXINLG","canonical_record":{"source":{"id":"1809.05862","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.SD","submitted_at":"2018-09-16T12:28:19Z","cross_cats_sorted":["eess.AS"],"title_canon_sha256":"46d45dbe58cef12612378aad765fda09253c271ded6354fa1ef6614ba6faf327","abstract_canon_sha256":"d31bb837941dd85381796db9517790cc12590d1a2c3ee7158c7ad19226236baa"},"schema_version":"1.0"},"canonical_sha256":"5609743566265773f44551eae8c9ee30db79eeb485fade5776e5cc52d080d347","source":{"kind":"arxiv","id":"1809.05862","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1809.05862","created_at":"2026-05-18T00:05:36Z"},{"alias_kind":"arxiv_version","alias_value":"1809.05862v1","created_at":"2026-05-18T00:05:36Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1809.05862","created_at":"2026-05-18T00:05:36Z"},{"alias_kind":"pith_short_12","alias_value":"KYEXINLGEZLX","created_at":"2026-05-18T12:32:33Z"},{"alias_kind":"pith_short_16","alias_value":"KYEXINLGEZLXH5CF","created_at":"2026-05-18T12:32:33Z"},{"alias_kind":"pith_short_8","alias_value":"KYEXINLG","created_at":"2026-05-18T12:32:33Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2018:KYEXINLGEZLXH5CFKHVORSPOGD","target":"record","payload":{"canonical_record":{"source":{"id":"1809.05862","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.SD","submitted_at":"2018-09-16T12:28:19Z","cross_cats_sorted":["eess.AS"],"title_canon_sha256":"46d45dbe58cef12612378aad765fda09253c271ded6354fa1ef6614ba6faf327","abstract_canon_sha256":"d31bb837941dd85381796db9517790cc12590d1a2c3ee7158c7ad19226236baa"},"schema_version":"1.0"},"canonical_sha256":"5609743566265773f44551eae8c9ee30db79eeb485fade5776e5cc52d080d347","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T00:05:36.282338Z","signature_b64":"3kZjOPMfFqCypMh09zQ42yFNz9zLJhKLUZ35fwLuX0C4bIhKhm6dnJh6x9ryCe8UgVfv+TIE/Y12JdSoVBDADA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"5609743566265773f44551eae8c9ee30db79eeb485fade5776e5cc52d080d347","last_reissued_at":"2026-05-18T00:05:36.281761Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T00:05:36.281761Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1809.05862","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":"2026-05-18T00:05:36Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"zSmdK0CDmIONNZVkxp7LOuu/Ob5Z8tc3NU3xC/bNGBixMHcoxtAPMQE4UPCjAHHBQ3lRW5+O3pmcHD5SqEClBQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-19T22:45:06.703028Z"},"content_sha256":"cb214d47757deeafd67515b12cb11787093b2a7351644181cb1771b9d8f44c65","schema_version":"1.0","event_id":"sha256:cb214d47757deeafd67515b12cb11787093b2a7351644181cb1771b9d8f44c65"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2018:KYEXINLGEZLXH5CFKHVORSPOGD","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Cocktails, but no party: multipath-enabled private audio","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["eess.AS"],"primary_cat":"cs.SD","authors_text":"Ivan Dokmani\\'c, Jonah Casebeer, Yu-Jeh Liu","submitted_at":"2018-09-16T12:28:19Z","abstract_excerpt":"We describe a private audio messaging system that uses echoes to unscramble messages at a few predetermined locations in a room. The system works by splitting the audio into short chunks and emitting them from different loudspeakers. The chunks are filtered so that as they echo around the room, they sum to noise everywhere except at a few chosen focusing spots where they exactly reproduce the intended messages. Unlike in the case of standard personal audio zones, the proposed method renders sound outside the focusing spots unintelligible. Our method essentially depends on echoes: the room acts"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1809.05862","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":""},"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":"2026-05-18T00:05:36Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"l9QOkhRlxQi2559yFJbbUMYKHvKeosd4fV8uFnzNf5lmqY9wOnjQtJT4udoHZDa87iRvHA20iXTM8VdsTqHOAw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-19T22:45:06.703378Z"},"content_sha256":"de4aa35a24a1edcc85606becedb222701e33628ba8e324dc14e99263604334e2","schema_version":"1.0","event_id":"sha256:de4aa35a24a1edcc85606becedb222701e33628ba8e324dc14e99263604334e2"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/KYEXINLGEZLXH5CFKHVORSPOGD/bundle.json","state_url":"https://pith.science/pith/KYEXINLGEZLXH5CFKHVORSPOGD/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/KYEXINLGEZLXH5CFKHVORSPOGD/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":"2026-05-19T22:45:06Z","links":{"resolver":"https://pith.science/pith/KYEXINLGEZLXH5CFKHVORSPOGD","bundle":"https://pith.science/pith/KYEXINLGEZLXH5CFKHVORSPOGD/bundle.json","state":"https://pith.science/pith/KYEXINLGEZLXH5CFKHVORSPOGD/state.json","well_known_bundle":"https://pith.science/.well-known/pith/KYEXINLGEZLXH5CFKHVORSPOGD/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2018:KYEXINLGEZLXH5CFKHVORSPOGD","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":"d31bb837941dd85381796db9517790cc12590d1a2c3ee7158c7ad19226236baa","cross_cats_sorted":["eess.AS"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.SD","submitted_at":"2018-09-16T12:28:19Z","title_canon_sha256":"46d45dbe58cef12612378aad765fda09253c271ded6354fa1ef6614ba6faf327"},"schema_version":"1.0","source":{"id":"1809.05862","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1809.05862","created_at":"2026-05-18T00:05:36Z"},{"alias_kind":"arxiv_version","alias_value":"1809.05862v1","created_at":"2026-05-18T00:05:36Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1809.05862","created_at":"2026-05-18T00:05:36Z"},{"alias_kind":"pith_short_12","alias_value":"KYEXINLGEZLX","created_at":"2026-05-18T12:32:33Z"},{"alias_kind":"pith_short_16","alias_value":"KYEXINLGEZLXH5CF","created_at":"2026-05-18T12:32:33Z"},{"alias_kind":"pith_short_8","alias_value":"KYEXINLG","created_at":"2026-05-18T12:32:33Z"}],"graph_snapshots":[{"event_id":"sha256:de4aa35a24a1edcc85606becedb222701e33628ba8e324dc14e99263604334e2","target":"graph","created_at":"2026-05-18T00:05:36Z","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"},"paper":{"abstract_excerpt":"We describe a private audio messaging system that uses echoes to unscramble messages at a few predetermined locations in a room. The system works by splitting the audio into short chunks and emitting them from different loudspeakers. The chunks are filtered so that as they echo around the room, they sum to noise everywhere except at a few chosen focusing spots where they exactly reproduce the intended messages. Unlike in the case of standard personal audio zones, the proposed method renders sound outside the focusing spots unintelligible. Our method essentially depends on echoes: the room acts","authors_text":"Ivan Dokmani\\'c, Jonah Casebeer, Yu-Jeh Liu","cross_cats":["eess.AS"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.SD","submitted_at":"2018-09-16T12:28:19Z","title":"Cocktails, but no party: multipath-enabled private audio"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1809.05862","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:cb214d47757deeafd67515b12cb11787093b2a7351644181cb1771b9d8f44c65","target":"record","created_at":"2026-05-18T00:05:36Z","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":"d31bb837941dd85381796db9517790cc12590d1a2c3ee7158c7ad19226236baa","cross_cats_sorted":["eess.AS"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.SD","submitted_at":"2018-09-16T12:28:19Z","title_canon_sha256":"46d45dbe58cef12612378aad765fda09253c271ded6354fa1ef6614ba6faf327"},"schema_version":"1.0","source":{"id":"1809.05862","kind":"arxiv","version":1}},"canonical_sha256":"5609743566265773f44551eae8c9ee30db79eeb485fade5776e5cc52d080d347","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"5609743566265773f44551eae8c9ee30db79eeb485fade5776e5cc52d080d347","first_computed_at":"2026-05-18T00:05:36.281761Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:05:36.281761Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"3kZjOPMfFqCypMh09zQ42yFNz9zLJhKLUZ35fwLuX0C4bIhKhm6dnJh6x9ryCe8UgVfv+TIE/Y12JdSoVBDADA==","signature_status":"signed_v1","signed_at":"2026-05-18T00:05:36.282338Z","signed_message":"canonical_sha256_bytes"},"source_id":"1809.05862","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:cb214d47757deeafd67515b12cb11787093b2a7351644181cb1771b9d8f44c65","sha256:de4aa35a24a1edcc85606becedb222701e33628ba8e324dc14e99263604334e2"],"state_sha256":"3ea421c4bc155fe01d93989aa054382beb48d8f3ec7bcd06b72b546a464ebfb2"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"jcWwCt3yHaif9tZWw/KGW3ijs86Lf8yTH9B1aKysczGANZJJ/d+8ag5eUQ70OWhOwXC7ux2r8gPpy/iNO77oDQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-19T22:45:06.705269Z","bundle_sha256":"cd67f956056a178125b90bd6fa941514f52127c6da599cf73548ecd4c609be35"}}