{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2015:VHRTYN4P3LMXFOCJC7ORBRJT7E","short_pith_number":"pith:VHRTYN4P","canonical_record":{"source":{"id":"1510.02868","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.class-ph","submitted_at":"2015-10-10T03:07:15Z","cross_cats_sorted":["physics.pop-ph"],"title_canon_sha256":"690d8ec8508af07d4f927dab662c04fc4d4369ccec6f99d9d942e3a5ff7bd1b8","abstract_canon_sha256":"993e0973262fa6518a2e489b188359e76ce8b1a640d243458551e73a4ce77640"},"schema_version":"1.0"},"canonical_sha256":"a9e33c378fdad972b84917dd10c533f910bba1e8d0689b200b564334e3c10039","source":{"kind":"arxiv","id":"1510.02868","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1510.02868","created_at":"2026-05-18T01:30:33Z"},{"alias_kind":"arxiv_version","alias_value":"1510.02868v1","created_at":"2026-05-18T01:30:33Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1510.02868","created_at":"2026-05-18T01:30:33Z"},{"alias_kind":"pith_short_12","alias_value":"VHRTYN4P3LMX","created_at":"2026-05-18T12:29:44Z"},{"alias_kind":"pith_short_16","alias_value":"VHRTYN4P3LMXFOCJ","created_at":"2026-05-18T12:29:44Z"},{"alias_kind":"pith_short_8","alias_value":"VHRTYN4P","created_at":"2026-05-18T12:29:44Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2015:VHRTYN4P3LMXFOCJC7ORBRJT7E","target":"record","payload":{"canonical_record":{"source":{"id":"1510.02868","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.class-ph","submitted_at":"2015-10-10T03:07:15Z","cross_cats_sorted":["physics.pop-ph"],"title_canon_sha256":"690d8ec8508af07d4f927dab662c04fc4d4369ccec6f99d9d942e3a5ff7bd1b8","abstract_canon_sha256":"993e0973262fa6518a2e489b188359e76ce8b1a640d243458551e73a4ce77640"},"schema_version":"1.0"},"canonical_sha256":"a9e33c378fdad972b84917dd10c533f910bba1e8d0689b200b564334e3c10039","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:30:33.519748Z","signature_b64":"6zEncbxi0QRFtE/j/tk5JObyLc1tE6mS6K2taM7/nK3UhSTmxD4jL7DbUK4a2bOYLzpXdPVQhUzNBPI1xekdBA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"a9e33c378fdad972b84917dd10c533f910bba1e8d0689b200b564334e3c10039","last_reissued_at":"2026-05-18T01:30:33.519014Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:30:33.519014Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1510.02868","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":"2026-05-18T01:30:33Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"tW/XN9H8KCREb2S5fPRkojMcGm0bG7AcfW/KYwCTQ/K71R/WKF0IfTVMKD0dbqRXWVrVUMbVSLnI4DxTtlyHAQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-07T06:11:08.840899Z"},"content_sha256":"9f913d6263b8a6d940a9ecd06ad8a52bdb09037f48309fbb4fd1113e575a8f67","schema_version":"1.0","event_id":"sha256:9f913d6263b8a6d940a9ecd06ad8a52bdb09037f48309fbb4fd1113e575a8f67"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2015:VHRTYN4P3LMXFOCJC7ORBRJT7E","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Inverse Doppler Effects in Flute","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["physics.pop-ph"],"primary_cat":"physics.class-ph","authors_text":"Chun R. Luo, Fang L. Shen, Lin L. Li, Shi L. Zhai, Song Liu, Xiao P. Zhao","submitted_at":"2015-10-10T03:07:15Z","abstract_excerpt":"Here we report the observation of the inverse Doppler effects in a flute. It is experimentally verified that, when there is a relative movement between the source and the observer, the inverse Doppler effect could be detected for all seven pitches of a musical scale produced by a flute. Higher tone is associated with a greater shift in frequency. The effect of the inverse frequency shift may provide new insights into why the flute, with its euphonious tone, has been popular for thousands of years in Asia and Europe."},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1510.02868","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":"2026-05-18T01:30:33Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"wP7wZIJiVB5clmBWeQ4WPFD2UW9w1YVPPkQRdxd56UH5w1RFLuAPgMtd+3/356APnEiU8Qhuw6DN7EMzWnm+Dg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-07T06:11:08.841558Z"},"content_sha256":"23fdb140b5ff93c9ea67703c25433aa6b03dce653a10fbb5571d634607c9cbbd","schema_version":"1.0","event_id":"sha256:23fdb140b5ff93c9ea67703c25433aa6b03dce653a10fbb5571d634607c9cbbd"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/VHRTYN4P3LMXFOCJC7ORBRJT7E/bundle.json","state_url":"https://pith.science/pith/VHRTYN4P3LMXFOCJC7ORBRJT7E/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/VHRTYN4P3LMXFOCJC7ORBRJT7E/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":"2026-06-07T06:11:08Z","links":{"resolver":"https://pith.science/pith/VHRTYN4P3LMXFOCJC7ORBRJT7E","bundle":"https://pith.science/pith/VHRTYN4P3LMXFOCJC7ORBRJT7E/bundle.json","state":"https://pith.science/pith/VHRTYN4P3LMXFOCJC7ORBRJT7E/state.json","well_known_bundle":"https://pith.science/.well-known/pith/VHRTYN4P3LMXFOCJC7ORBRJT7E/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2015:VHRTYN4P3LMXFOCJC7ORBRJT7E","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":"993e0973262fa6518a2e489b188359e76ce8b1a640d243458551e73a4ce77640","cross_cats_sorted":["physics.pop-ph"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.class-ph","submitted_at":"2015-10-10T03:07:15Z","title_canon_sha256":"690d8ec8508af07d4f927dab662c04fc4d4369ccec6f99d9d942e3a5ff7bd1b8"},"schema_version":"1.0","source":{"id":"1510.02868","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1510.02868","created_at":"2026-05-18T01:30:33Z"},{"alias_kind":"arxiv_version","alias_value":"1510.02868v1","created_at":"2026-05-18T01:30:33Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1510.02868","created_at":"2026-05-18T01:30:33Z"},{"alias_kind":"pith_short_12","alias_value":"VHRTYN4P3LMX","created_at":"2026-05-18T12:29:44Z"},{"alias_kind":"pith_short_16","alias_value":"VHRTYN4P3LMXFOCJ","created_at":"2026-05-18T12:29:44Z"},{"alias_kind":"pith_short_8","alias_value":"VHRTYN4P","created_at":"2026-05-18T12:29:44Z"}],"graph_snapshots":[{"event_id":"sha256:23fdb140b5ff93c9ea67703c25433aa6b03dce653a10fbb5571d634607c9cbbd","target":"graph","created_at":"2026-05-18T01:30:33Z","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":"Here we report the observation of the inverse Doppler effects in a flute. It is experimentally verified that, when there is a relative movement between the source and the observer, the inverse Doppler effect could be detected for all seven pitches of a musical scale produced by a flute. Higher tone is associated with a greater shift in frequency. The effect of the inverse frequency shift may provide new insights into why the flute, with its euphonious tone, has been popular for thousands of years in Asia and Europe.","authors_text":"Chun R. Luo, Fang L. Shen, Lin L. Li, Shi L. Zhai, Song Liu, Xiao P. Zhao","cross_cats":["physics.pop-ph"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.class-ph","submitted_at":"2015-10-10T03:07:15Z","title":"Inverse Doppler Effects in Flute"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1510.02868","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":"sha256:9f913d6263b8a6d940a9ecd06ad8a52bdb09037f48309fbb4fd1113e575a8f67","target":"record","created_at":"2026-05-18T01:30:33Z","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":"993e0973262fa6518a2e489b188359e76ce8b1a640d243458551e73a4ce77640","cross_cats_sorted":["physics.pop-ph"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.class-ph","submitted_at":"2015-10-10T03:07:15Z","title_canon_sha256":"690d8ec8508af07d4f927dab662c04fc4d4369ccec6f99d9d942e3a5ff7bd1b8"},"schema_version":"1.0","source":{"id":"1510.02868","kind":"arxiv","version":1}},"canonical_sha256":"a9e33c378fdad972b84917dd10c533f910bba1e8d0689b200b564334e3c10039","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"a9e33c378fdad972b84917dd10c533f910bba1e8d0689b200b564334e3c10039","first_computed_at":"2026-05-18T01:30:33.519014Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:30:33.519014Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"6zEncbxi0QRFtE/j/tk5JObyLc1tE6mS6K2taM7/nK3UhSTmxD4jL7DbUK4a2bOYLzpXdPVQhUzNBPI1xekdBA==","signature_status":"signed_v1","signed_at":"2026-05-18T01:30:33.519748Z","signed_message":"canonical_sha256_bytes"},"source_id":"1510.02868","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:9f913d6263b8a6d940a9ecd06ad8a52bdb09037f48309fbb4fd1113e575a8f67","sha256:23fdb140b5ff93c9ea67703c25433aa6b03dce653a10fbb5571d634607c9cbbd"],"state_sha256":"5769af528c08d5c6b42abcc1333545d80efe167d9da56ec10cdc30cbda8d1ef6"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"zCfPiMROWJW5awBbWNJu1FPQA1ThTymP5F9tdh8udjnjwZuFkGAXk7i3gXnZalWj6qSueztDdWcez+zdiwTQCw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-07T06:11:08.847733Z","bundle_sha256":"887db9cc63be43fdd6e8798a56e52f5a163f7a8791590a27adfd349970ad0815"}}