{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2019:VHSKEIYMBWBP3G5WPAWQ76TRIG","short_pith_number":"pith:VHSKEIYM","canonical_record":{"source":{"id":"1907.07675","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"eess.SP","submitted_at":"2019-07-17T05:57:59Z","cross_cats_sorted":["cs.SY","eess.SY"],"title_canon_sha256":"0025b42368f9bbb66be6e3d6d4f25eb0b1b7428a622ff43c4f12a749580961b8","abstract_canon_sha256":"4e89a1ca58ece86e84d13fb7d700e4394c92aa8763d364c836319139e2654230"},"schema_version":"1.0"},"canonical_sha256":"a9e4a2230c0d82fd9bb6782d0ffa71419cb40f7b5fb798ef31381dc5f01b4b8e","source":{"kind":"arxiv","id":"1907.07675","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1907.07675","created_at":"2026-05-17T23:40:16Z"},{"alias_kind":"arxiv_version","alias_value":"1907.07675v1","created_at":"2026-05-17T23:40:16Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1907.07675","created_at":"2026-05-17T23:40:16Z"},{"alias_kind":"pith_short_12","alias_value":"VHSKEIYMBWBP","created_at":"2026-05-18T12:33:30Z"},{"alias_kind":"pith_short_16","alias_value":"VHSKEIYMBWBP3G5W","created_at":"2026-05-18T12:33:30Z"},{"alias_kind":"pith_short_8","alias_value":"VHSKEIYM","created_at":"2026-05-18T12:33:30Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2019:VHSKEIYMBWBP3G5WPAWQ76TRIG","target":"record","payload":{"canonical_record":{"source":{"id":"1907.07675","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"eess.SP","submitted_at":"2019-07-17T05:57:59Z","cross_cats_sorted":["cs.SY","eess.SY"],"title_canon_sha256":"0025b42368f9bbb66be6e3d6d4f25eb0b1b7428a622ff43c4f12a749580961b8","abstract_canon_sha256":"4e89a1ca58ece86e84d13fb7d700e4394c92aa8763d364c836319139e2654230"},"schema_version":"1.0"},"canonical_sha256":"a9e4a2230c0d82fd9bb6782d0ffa71419cb40f7b5fb798ef31381dc5f01b4b8e","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-17T23:40:16.762587Z","signature_b64":"5u/4oUi+WCdSVSKDM63TgpGl+Mb8P5/PdxHyq2SVLl4tlxnxmBZJGVrZQQDJK5LjouaaglDRzMY2lPwiufe1Aw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"a9e4a2230c0d82fd9bb6782d0ffa71419cb40f7b5fb798ef31381dc5f01b4b8e","last_reissued_at":"2026-05-17T23:40:16.761923Z","signature_status":"signed_v1","first_computed_at":"2026-05-17T23:40:16.761923Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1907.07675","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":"2026-05-17T23:40:16Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"hAO2y27LJyrYdnzseLPHsZGxp8uw/dE1xvVYoAG02JS8xhbOQLDoOuTrTxS0G7RSHkuhK48xJVeFXBbMb3Z3CQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-28T05:47:18.854230Z"},"content_sha256":"56cf93c1436950993cc0e8d1e3291fd405adb98f262f3c16f6adccd817b6106a","schema_version":"1.0","event_id":"sha256:56cf93c1436950993cc0e8d1e3291fd405adb98f262f3c16f6adccd817b6106a"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2019:VHSKEIYMBWBP3G5WPAWQ76TRIG","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Distributed vibration sensing based on forward transmission and coherent detection","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["cs.SY","eess.SY"],"primary_cat":"eess.SP","authors_text":"Alan Pak Tao Lau, Changjian Guo, Chao Lu, Faisal Nadeem Khan, Xian Zhou, Xiong Wu, Yaxi Yan, Ziqi Lin","submitted_at":"2019-07-17T05:57:59Z","abstract_excerpt":"A novel ultra-long distributed vibration sensing (DVS) system using forward transmission and coherent detection is proposed and experimentally demonstrated. In the proposed scheme, a pair of multi-span optical fibers are deployed for sensing, and a loop-back configuration is used by connecting the two fibers at the far end. The homodyne coherent detection is used to retrieve the phase and state-of-polarization (SOP) fluctuations caused by a vibration while the localization of the vibration is realized by tracking the phase changes along the two fibers. The proposed scheme has the advantage of "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1907.07675","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":"2026-05-17T23:40:16Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"cQXiRJqfc0eH/rIXyAvrhhXwfhrKGyww2/guH0yTdnfwj/JIKwS34nQe+QPTmPApnJALp74JrQl5ujMmRX/UAw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-28T05:47:18.854610Z"},"content_sha256":"1eaeb82c57f7a6e591e7c778158fa1e02837169854c1ecd521cbe3650ae353ef","schema_version":"1.0","event_id":"sha256:1eaeb82c57f7a6e591e7c778158fa1e02837169854c1ecd521cbe3650ae353ef"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/VHSKEIYMBWBP3G5WPAWQ76TRIG/bundle.json","state_url":"https://pith.science/pith/VHSKEIYMBWBP3G5WPAWQ76TRIG/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/VHSKEIYMBWBP3G5WPAWQ76TRIG/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":"2026-05-28T05:47:18Z","links":{"resolver":"https://pith.science/pith/VHSKEIYMBWBP3G5WPAWQ76TRIG","bundle":"https://pith.science/pith/VHSKEIYMBWBP3G5WPAWQ76TRIG/bundle.json","state":"https://pith.science/pith/VHSKEIYMBWBP3G5WPAWQ76TRIG/state.json","well_known_bundle":"https://pith.science/.well-known/pith/VHSKEIYMBWBP3G5WPAWQ76TRIG/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2019:VHSKEIYMBWBP3G5WPAWQ76TRIG","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":"4e89a1ca58ece86e84d13fb7d700e4394c92aa8763d364c836319139e2654230","cross_cats_sorted":["cs.SY","eess.SY"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"eess.SP","submitted_at":"2019-07-17T05:57:59Z","title_canon_sha256":"0025b42368f9bbb66be6e3d6d4f25eb0b1b7428a622ff43c4f12a749580961b8"},"schema_version":"1.0","source":{"id":"1907.07675","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1907.07675","created_at":"2026-05-17T23:40:16Z"},{"alias_kind":"arxiv_version","alias_value":"1907.07675v1","created_at":"2026-05-17T23:40:16Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1907.07675","created_at":"2026-05-17T23:40:16Z"},{"alias_kind":"pith_short_12","alias_value":"VHSKEIYMBWBP","created_at":"2026-05-18T12:33:30Z"},{"alias_kind":"pith_short_16","alias_value":"VHSKEIYMBWBP3G5W","created_at":"2026-05-18T12:33:30Z"},{"alias_kind":"pith_short_8","alias_value":"VHSKEIYM","created_at":"2026-05-18T12:33:30Z"}],"graph_snapshots":[{"event_id":"sha256:1eaeb82c57f7a6e591e7c778158fa1e02837169854c1ecd521cbe3650ae353ef","target":"graph","created_at":"2026-05-17T23:40:16Z","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":"A novel ultra-long distributed vibration sensing (DVS) system using forward transmission and coherent detection is proposed and experimentally demonstrated. In the proposed scheme, a pair of multi-span optical fibers are deployed for sensing, and a loop-back configuration is used by connecting the two fibers at the far end. The homodyne coherent detection is used to retrieve the phase and state-of-polarization (SOP) fluctuations caused by a vibration while the localization of the vibration is realized by tracking the phase changes along the two fibers. The proposed scheme has the advantage of ","authors_text":"Alan Pak Tao Lau, Changjian Guo, Chao Lu, Faisal Nadeem Khan, Xian Zhou, Xiong Wu, Yaxi Yan, Ziqi Lin","cross_cats":["cs.SY","eess.SY"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"eess.SP","submitted_at":"2019-07-17T05:57:59Z","title":"Distributed vibration sensing based on forward transmission and coherent detection"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1907.07675","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":"sha256:56cf93c1436950993cc0e8d1e3291fd405adb98f262f3c16f6adccd817b6106a","target":"record","created_at":"2026-05-17T23:40:16Z","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":"4e89a1ca58ece86e84d13fb7d700e4394c92aa8763d364c836319139e2654230","cross_cats_sorted":["cs.SY","eess.SY"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"eess.SP","submitted_at":"2019-07-17T05:57:59Z","title_canon_sha256":"0025b42368f9bbb66be6e3d6d4f25eb0b1b7428a622ff43c4f12a749580961b8"},"schema_version":"1.0","source":{"id":"1907.07675","kind":"arxiv","version":1}},"canonical_sha256":"a9e4a2230c0d82fd9bb6782d0ffa71419cb40f7b5fb798ef31381dc5f01b4b8e","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"a9e4a2230c0d82fd9bb6782d0ffa71419cb40f7b5fb798ef31381dc5f01b4b8e","first_computed_at":"2026-05-17T23:40:16.761923Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-17T23:40:16.761923Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"5u/4oUi+WCdSVSKDM63TgpGl+Mb8P5/PdxHyq2SVLl4tlxnxmBZJGVrZQQDJK5LjouaaglDRzMY2lPwiufe1Aw==","signature_status":"signed_v1","signed_at":"2026-05-17T23:40:16.762587Z","signed_message":"canonical_sha256_bytes"},"source_id":"1907.07675","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:56cf93c1436950993cc0e8d1e3291fd405adb98f262f3c16f6adccd817b6106a","sha256:1eaeb82c57f7a6e591e7c778158fa1e02837169854c1ecd521cbe3650ae353ef"],"state_sha256":"af7228c10ae852b0d3940f95295f118521b73c5e7fc214a86c3caa10e6cb3f58"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"FLods0GsN4N3SJ6gRYeX4SbboLuVU/z8ondvGMGailxwcoTBmyvgh2k/8OwQusPqHeQSmaaiQTz/7TOhrdxmAw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-28T05:47:18.856544Z","bundle_sha256":"e373784a742e35da50acbf0e13c915e98adc54957d03958320516d5a40a1179f"}}