{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2018:6DGJSOMOLGHZOF4CVVEPIULBIM","short_pith_number":"pith:6DGJSOMO","canonical_record":{"source":{"id":"1805.05902","kind":"arxiv","version":3},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"eess.SP","submitted_at":"2018-05-15T16:51:44Z","cross_cats_sorted":[],"title_canon_sha256":"bc91f4b029a48b0790c42fa54f89947eb90034d663e0bf2064c0e0db85598f30","abstract_canon_sha256":"b7b8f2fecd33f01024cb00dfa1613d39db69ccc9a210fca8d891e3add7d2925e"},"schema_version":"1.0"},"canonical_sha256":"f0cc99398e598f971782ad48f451614313f4053ec754624b129c618f58dec392","source":{"kind":"arxiv","id":"1805.05902","version":3},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1805.05902","created_at":"2026-05-17T23:57:59Z"},{"alias_kind":"arxiv_version","alias_value":"1805.05902v3","created_at":"2026-05-17T23:57:59Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1805.05902","created_at":"2026-05-17T23:57:59Z"},{"alias_kind":"pith_short_12","alias_value":"6DGJSOMOLGHZ","created_at":"2026-05-18T12:32:08Z"},{"alias_kind":"pith_short_16","alias_value":"6DGJSOMOLGHZOF4C","created_at":"2026-05-18T12:32:08Z"},{"alias_kind":"pith_short_8","alias_value":"6DGJSOMO","created_at":"2026-05-18T12:32:08Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2018:6DGJSOMOLGHZOF4CVVEPIULBIM","target":"record","payload":{"canonical_record":{"source":{"id":"1805.05902","kind":"arxiv","version":3},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"eess.SP","submitted_at":"2018-05-15T16:51:44Z","cross_cats_sorted":[],"title_canon_sha256":"bc91f4b029a48b0790c42fa54f89947eb90034d663e0bf2064c0e0db85598f30","abstract_canon_sha256":"b7b8f2fecd33f01024cb00dfa1613d39db69ccc9a210fca8d891e3add7d2925e"},"schema_version":"1.0"},"canonical_sha256":"f0cc99398e598f971782ad48f451614313f4053ec754624b129c618f58dec392","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-17T23:57:59.388827Z","signature_b64":"eMjn0btX+PicDxURvbR/stjour883+/ShvsbgEeIk2/prlcrkjpq2W3VzIPwKutdKBVtBBKgoTH3m93DT9h5DA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"f0cc99398e598f971782ad48f451614313f4053ec754624b129c618f58dec392","last_reissued_at":"2026-05-17T23:57:59.388299Z","signature_status":"signed_v1","first_computed_at":"2026-05-17T23:57:59.388299Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1805.05902","source_version":3,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-17T23:57:59Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"BB8LDya7mN1t48AQNZ/P8Jm/JOK0g0xyvyzYnIiZPgpOgDYNcX5Po9I8BI5UcoXgTh/p92gaAp6jzJAffDA3Dw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-11T13:08:19.459567Z"},"content_sha256":"cf886b26fe5c5b1ebdd40ad72f7e1fc0a7cf7a4471c84163d9c43006290d7ac8","schema_version":"1.0","event_id":"sha256:cf886b26fe5c5b1ebdd40ad72f7e1fc0a7cf7a4471c84163d9c43006290d7ac8"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2018:6DGJSOMOLGHZOF4CVVEPIULBIM","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Linearized Bregman Iterations for Automatic Optical Fiber Fault Analysis","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"eess.SP","authors_text":"Gustavo C. Amaral, Michael Lunglmayr","submitted_at":"2018-05-15T16:51:44Z","abstract_excerpt":"Supervision of the physical layer of optical networks is an extremely relevant subject. To detect fiber faults, single-ended solutions such as the Optical Time Domain Reflectometer (OTDR) allow for precise measurements of fault profiles. Combining the OTDR with a signal processing approach for high-dimensional sparse parameter estimation allows for automated and reliable results in reduced time. In this work, a measurement system composed of a Photon-Counting OTDR data acquisition unit and a processing unit based on a Linearized Bregman Iterations algorithm for automatic fault finding is propo"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1805.05902","kind":"arxiv","version":3},"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":"2026-05-17T23:57:59Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"nDM0HmX1QRaFpD6EI+V+QFe2GXtQDk77BK5FOK6Dcj8xJc2CH4oGGj6eZTP7VPja6D4gQSthzIunBdUUoJd2Dw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-11T13:08:19.459913Z"},"content_sha256":"be369a22b5473c471919760738732eaccb1943a03d084f35feb12a8473f7b244","schema_version":"1.0","event_id":"sha256:be369a22b5473c471919760738732eaccb1943a03d084f35feb12a8473f7b244"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/6DGJSOMOLGHZOF4CVVEPIULBIM/bundle.json","state_url":"https://pith.science/pith/6DGJSOMOLGHZOF4CVVEPIULBIM/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/6DGJSOMOLGHZOF4CVVEPIULBIM/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":"2026-06-11T13:08:19Z","links":{"resolver":"https://pith.science/pith/6DGJSOMOLGHZOF4CVVEPIULBIM","bundle":"https://pith.science/pith/6DGJSOMOLGHZOF4CVVEPIULBIM/bundle.json","state":"https://pith.science/pith/6DGJSOMOLGHZOF4CVVEPIULBIM/state.json","well_known_bundle":"https://pith.science/.well-known/pith/6DGJSOMOLGHZOF4CVVEPIULBIM/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2018:6DGJSOMOLGHZOF4CVVEPIULBIM","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":"b7b8f2fecd33f01024cb00dfa1613d39db69ccc9a210fca8d891e3add7d2925e","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"eess.SP","submitted_at":"2018-05-15T16:51:44Z","title_canon_sha256":"bc91f4b029a48b0790c42fa54f89947eb90034d663e0bf2064c0e0db85598f30"},"schema_version":"1.0","source":{"id":"1805.05902","kind":"arxiv","version":3}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1805.05902","created_at":"2026-05-17T23:57:59Z"},{"alias_kind":"arxiv_version","alias_value":"1805.05902v3","created_at":"2026-05-17T23:57:59Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1805.05902","created_at":"2026-05-17T23:57:59Z"},{"alias_kind":"pith_short_12","alias_value":"6DGJSOMOLGHZ","created_at":"2026-05-18T12:32:08Z"},{"alias_kind":"pith_short_16","alias_value":"6DGJSOMOLGHZOF4C","created_at":"2026-05-18T12:32:08Z"},{"alias_kind":"pith_short_8","alias_value":"6DGJSOMO","created_at":"2026-05-18T12:32:08Z"}],"graph_snapshots":[{"event_id":"sha256:be369a22b5473c471919760738732eaccb1943a03d084f35feb12a8473f7b244","target":"graph","created_at":"2026-05-17T23:57:59Z","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":"Supervision of the physical layer of optical networks is an extremely relevant subject. To detect fiber faults, single-ended solutions such as the Optical Time Domain Reflectometer (OTDR) allow for precise measurements of fault profiles. Combining the OTDR with a signal processing approach for high-dimensional sparse parameter estimation allows for automated and reliable results in reduced time. In this work, a measurement system composed of a Photon-Counting OTDR data acquisition unit and a processing unit based on a Linearized Bregman Iterations algorithm for automatic fault finding is propo","authors_text":"Gustavo C. Amaral, Michael Lunglmayr","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"eess.SP","submitted_at":"2018-05-15T16:51:44Z","title":"Linearized Bregman Iterations for Automatic Optical Fiber Fault Analysis"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1805.05902","kind":"arxiv","version":3},"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:cf886b26fe5c5b1ebdd40ad72f7e1fc0a7cf7a4471c84163d9c43006290d7ac8","target":"record","created_at":"2026-05-17T23:57:59Z","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":"b7b8f2fecd33f01024cb00dfa1613d39db69ccc9a210fca8d891e3add7d2925e","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"eess.SP","submitted_at":"2018-05-15T16:51:44Z","title_canon_sha256":"bc91f4b029a48b0790c42fa54f89947eb90034d663e0bf2064c0e0db85598f30"},"schema_version":"1.0","source":{"id":"1805.05902","kind":"arxiv","version":3}},"canonical_sha256":"f0cc99398e598f971782ad48f451614313f4053ec754624b129c618f58dec392","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"f0cc99398e598f971782ad48f451614313f4053ec754624b129c618f58dec392","first_computed_at":"2026-05-17T23:57:59.388299Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-17T23:57:59.388299Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"eMjn0btX+PicDxURvbR/stjour883+/ShvsbgEeIk2/prlcrkjpq2W3VzIPwKutdKBVtBBKgoTH3m93DT9h5DA==","signature_status":"signed_v1","signed_at":"2026-05-17T23:57:59.388827Z","signed_message":"canonical_sha256_bytes"},"source_id":"1805.05902","source_kind":"arxiv","source_version":3}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:cf886b26fe5c5b1ebdd40ad72f7e1fc0a7cf7a4471c84163d9c43006290d7ac8","sha256:be369a22b5473c471919760738732eaccb1943a03d084f35feb12a8473f7b244"],"state_sha256":"48be7973f4051ceea9b68402d2dc7fe054dcb820eccaece7012013fab73ce267"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"Vmy02nVy838rQDQCrlcU0VHAHk+hE9Z5+ZtqyF5nqanNybYAZtYjujvQdPLusfKhPmHkdmASqPFtXwQBMkb1Cg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-11T13:08:19.461864Z","bundle_sha256":"844896c784a9b1ed455769d70ccec9f403282ba2c6ce06af8b1504baea8e5ee0"}}