{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2017:EPNFZX3ZH4SLAX2PPSXRRKVJQX","short_pith_number":"pith:EPNFZX3Z","canonical_record":{"source":{"id":"1707.00468","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.app-ph","submitted_at":"2017-07-03T10:01:48Z","cross_cats_sorted":[],"title_canon_sha256":"5130b0548240f51df829c4e787a493e9e774816494239fa2eef4f79fe3518818","abstract_canon_sha256":"eee36ee60bc762a5ab525e39bcd3fb26cf85842f7b6a602c70578b97717b1cc2"},"schema_version":"1.0"},"canonical_sha256":"23da5cdf793f24b05f4f7caf18aaa985ed2bab4c92523fe0ca8309e0b3d8ce9c","source":{"kind":"arxiv","id":"1707.00468","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1707.00468","created_at":"2026-05-18T00:35:19Z"},{"alias_kind":"arxiv_version","alias_value":"1707.00468v2","created_at":"2026-05-18T00:35:19Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1707.00468","created_at":"2026-05-18T00:35:19Z"},{"alias_kind":"pith_short_12","alias_value":"EPNFZX3ZH4SL","created_at":"2026-05-18T12:31:12Z"},{"alias_kind":"pith_short_16","alias_value":"EPNFZX3ZH4SLAX2P","created_at":"2026-05-18T12:31:12Z"},{"alias_kind":"pith_short_8","alias_value":"EPNFZX3Z","created_at":"2026-05-18T12:31:12Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2017:EPNFZX3ZH4SLAX2PPSXRRKVJQX","target":"record","payload":{"canonical_record":{"source":{"id":"1707.00468","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.app-ph","submitted_at":"2017-07-03T10:01:48Z","cross_cats_sorted":[],"title_canon_sha256":"5130b0548240f51df829c4e787a493e9e774816494239fa2eef4f79fe3518818","abstract_canon_sha256":"eee36ee60bc762a5ab525e39bcd3fb26cf85842f7b6a602c70578b97717b1cc2"},"schema_version":"1.0"},"canonical_sha256":"23da5cdf793f24b05f4f7caf18aaa985ed2bab4c92523fe0ca8309e0b3d8ce9c","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T00:35:19.649909Z","signature_b64":"jVlOzkpWSrgKQsTMp9nv9+GY/2+OErkxPELevOC5hpEgZ34MhyRodgE2QWu6fmAPiOBj8+GdpzUykH3wXUJ3Cw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"23da5cdf793f24b05f4f7caf18aaa985ed2bab4c92523fe0ca8309e0b3d8ce9c","last_reissued_at":"2026-05-18T00:35:19.649427Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T00:35:19.649427Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1707.00468","source_version":2,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T00:35:19Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"pXShiV1I1E5gd35ayu09O/9VNI8imHXBqXb7Q2H6kBxMQ2u0Mp/65xfFCPWuZqxL5WnN5xc/wxcFOc/StzAyAA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-26T19:58:28.522907Z"},"content_sha256":"1a1df929030caa6be5489874e58ad268050b1e881741b24ece03a3aa37482544","schema_version":"1.0","event_id":"sha256:1a1df929030caa6be5489874e58ad268050b1e881741b24ece03a3aa37482544"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2017:EPNFZX3ZH4SLAX2PPSXRRKVJQX","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Spatial filtering of audible sound with acoustic landscapes","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"physics.app-ph","authors_text":"Jiancheng Tao, Jianchun Cheng, Shuping Wang, Xiaojun Qiu","submitted_at":"2017-07-03T10:01:48Z","abstract_excerpt":"Acoustic metasurfaces manipulate waves with specially designed structures and achieve properties that natural materials cannot offer. Similar surfaces work in audio frequency range as well and lead to marvelous acoustic phenomena that can be perceived by human ears. Being intrigued by the famous Maoshan Bugle phenomenon, we investigate large scale metasurfaces consisting of periodic steps of sizes comparable to the wavelength of audio frequency in both time and space domains. We propose a theoretical method to calculate the scattered sound field and find that periodic corrugated surfaces work "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1707.00468","kind":"arxiv","version":2},"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":"2026-05-18T00:35:19Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"WDTOvxNorSwQSpblacILpXB+kR5UrDRYtXl9tIaLIjpIPxRBifHh0DQlbz44c+kahaQo8dPqLhanI8qBXDkgAg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-26T19:58:28.523299Z"},"content_sha256":"b1608c00759aa3a37bfff80f3be81c2147494a86d9fc253b414c7bf905e3b7c5","schema_version":"1.0","event_id":"sha256:b1608c00759aa3a37bfff80f3be81c2147494a86d9fc253b414c7bf905e3b7c5"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/EPNFZX3ZH4SLAX2PPSXRRKVJQX/bundle.json","state_url":"https://pith.science/pith/EPNFZX3ZH4SLAX2PPSXRRKVJQX/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/EPNFZX3ZH4SLAX2PPSXRRKVJQX/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":"2026-05-26T19:58:28Z","links":{"resolver":"https://pith.science/pith/EPNFZX3ZH4SLAX2PPSXRRKVJQX","bundle":"https://pith.science/pith/EPNFZX3ZH4SLAX2PPSXRRKVJQX/bundle.json","state":"https://pith.science/pith/EPNFZX3ZH4SLAX2PPSXRRKVJQX/state.json","well_known_bundle":"https://pith.science/.well-known/pith/EPNFZX3ZH4SLAX2PPSXRRKVJQX/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2017:EPNFZX3ZH4SLAX2PPSXRRKVJQX","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":"eee36ee60bc762a5ab525e39bcd3fb26cf85842f7b6a602c70578b97717b1cc2","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.app-ph","submitted_at":"2017-07-03T10:01:48Z","title_canon_sha256":"5130b0548240f51df829c4e787a493e9e774816494239fa2eef4f79fe3518818"},"schema_version":"1.0","source":{"id":"1707.00468","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1707.00468","created_at":"2026-05-18T00:35:19Z"},{"alias_kind":"arxiv_version","alias_value":"1707.00468v2","created_at":"2026-05-18T00:35:19Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1707.00468","created_at":"2026-05-18T00:35:19Z"},{"alias_kind":"pith_short_12","alias_value":"EPNFZX3ZH4SL","created_at":"2026-05-18T12:31:12Z"},{"alias_kind":"pith_short_16","alias_value":"EPNFZX3ZH4SLAX2P","created_at":"2026-05-18T12:31:12Z"},{"alias_kind":"pith_short_8","alias_value":"EPNFZX3Z","created_at":"2026-05-18T12:31:12Z"}],"graph_snapshots":[{"event_id":"sha256:b1608c00759aa3a37bfff80f3be81c2147494a86d9fc253b414c7bf905e3b7c5","target":"graph","created_at":"2026-05-18T00:35:19Z","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":"Acoustic metasurfaces manipulate waves with specially designed structures and achieve properties that natural materials cannot offer. Similar surfaces work in audio frequency range as well and lead to marvelous acoustic phenomena that can be perceived by human ears. Being intrigued by the famous Maoshan Bugle phenomenon, we investigate large scale metasurfaces consisting of periodic steps of sizes comparable to the wavelength of audio frequency in both time and space domains. We propose a theoretical method to calculate the scattered sound field and find that periodic corrugated surfaces work ","authors_text":"Jiancheng Tao, Jianchun Cheng, Shuping Wang, Xiaojun Qiu","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.app-ph","submitted_at":"2017-07-03T10:01:48Z","title":"Spatial filtering of audible sound with acoustic landscapes"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1707.00468","kind":"arxiv","version":2},"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":"sha256:1a1df929030caa6be5489874e58ad268050b1e881741b24ece03a3aa37482544","target":"record","created_at":"2026-05-18T00:35:19Z","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":"eee36ee60bc762a5ab525e39bcd3fb26cf85842f7b6a602c70578b97717b1cc2","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.app-ph","submitted_at":"2017-07-03T10:01:48Z","title_canon_sha256":"5130b0548240f51df829c4e787a493e9e774816494239fa2eef4f79fe3518818"},"schema_version":"1.0","source":{"id":"1707.00468","kind":"arxiv","version":2}},"canonical_sha256":"23da5cdf793f24b05f4f7caf18aaa985ed2bab4c92523fe0ca8309e0b3d8ce9c","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"23da5cdf793f24b05f4f7caf18aaa985ed2bab4c92523fe0ca8309e0b3d8ce9c","first_computed_at":"2026-05-18T00:35:19.649427Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:35:19.649427Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"jVlOzkpWSrgKQsTMp9nv9+GY/2+OErkxPELevOC5hpEgZ34MhyRodgE2QWu6fmAPiOBj8+GdpzUykH3wXUJ3Cw==","signature_status":"signed_v1","signed_at":"2026-05-18T00:35:19.649909Z","signed_message":"canonical_sha256_bytes"},"source_id":"1707.00468","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:1a1df929030caa6be5489874e58ad268050b1e881741b24ece03a3aa37482544","sha256:b1608c00759aa3a37bfff80f3be81c2147494a86d9fc253b414c7bf905e3b7c5"],"state_sha256":"d5a9f5bb5742e65ceecbb0803fe2bbc830da2a001cbbc0c04b64b20933743f98"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"pXZgesNvkebpc+QvvMWPwHO9vlDAJaW9qm5j8F6hyN8ogoECvD7tI04x8a0KMD/gnZhUvqFawTVmDm26saPCCg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-26T19:58:28.525631Z","bundle_sha256":"dabb1af67f088ea5d8b51458aaf9813511622782a123e8b282ce118d560f68d9"}}