{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2019:RLTZPBRUGESDFC363EDY5XEGB5","short_pith_number":"pith:RLTZPBRU","canonical_record":{"source":{"id":"1906.02459","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.ins-det","submitted_at":"2019-06-06T07:43:36Z","cross_cats_sorted":[],"title_canon_sha256":"9cc1576d41a892cd616e5dd782b4f8f1ffd902f214b6cf8d09037a8a0e53c854","abstract_canon_sha256":"ac498a605ecbfca7d3284b94528c1f0f649215695c8023cdbbc0734a95f069be"},"schema_version":"1.0"},"canonical_sha256":"8ae79786343124328b7ed9078edc860f6145c2ed3a47b26dee42080783fb2eed","source":{"kind":"arxiv","id":"1906.02459","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1906.02459","created_at":"2026-05-17T23:39:53Z"},{"alias_kind":"arxiv_version","alias_value":"1906.02459v1","created_at":"2026-05-17T23:39:53Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1906.02459","created_at":"2026-05-17T23:39:53Z"},{"alias_kind":"pith_short_12","alias_value":"RLTZPBRUGESD","created_at":"2026-05-18T12:33:27Z"},{"alias_kind":"pith_short_16","alias_value":"RLTZPBRUGESDFC36","created_at":"2026-05-18T12:33:27Z"},{"alias_kind":"pith_short_8","alias_value":"RLTZPBRU","created_at":"2026-05-18T12:33:27Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2019:RLTZPBRUGESDFC363EDY5XEGB5","target":"record","payload":{"canonical_record":{"source":{"id":"1906.02459","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.ins-det","submitted_at":"2019-06-06T07:43:36Z","cross_cats_sorted":[],"title_canon_sha256":"9cc1576d41a892cd616e5dd782b4f8f1ffd902f214b6cf8d09037a8a0e53c854","abstract_canon_sha256":"ac498a605ecbfca7d3284b94528c1f0f649215695c8023cdbbc0734a95f069be"},"schema_version":"1.0"},"canonical_sha256":"8ae79786343124328b7ed9078edc860f6145c2ed3a47b26dee42080783fb2eed","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-17T23:39:53.643603Z","signature_b64":"gxJCa59z9mR4BmXRANASKDMYM0mvSvEOjn+AENrKDdy+uScrRW/wMgdNn263rpXUY/P/Dl7HuUBUamGOGqyuDw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"8ae79786343124328b7ed9078edc860f6145c2ed3a47b26dee42080783fb2eed","last_reissued_at":"2026-05-17T23:39:53.642824Z","signature_status":"signed_v1","first_computed_at":"2026-05-17T23:39:53.642824Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1906.02459","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":"2026-05-17T23:39:53Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"ajocTLkGKdFW0i9hUrbLWuc6T+mYdKpKCKjae7xMPtOJcKtkA3eEIAghrWOrI/IgMk2qrH2YQDkWwy1BSROCAw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-27T13:51:00.119626Z"},"content_sha256":"12653b68c1008388ed79d8b3fbea4f769142b8874479c8b93538e43aacd685cc","schema_version":"1.0","event_id":"sha256:12653b68c1008388ed79d8b3fbea4f769142b8874479c8b93538e43aacd685cc"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2019:RLTZPBRUGESDFC363EDY5XEGB5","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Real-time free-running time scale with remote clocks on fiber-based frequency network","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"physics.ins-det","authors_text":"A.M. Zhang, B. Wang, C.H. Han, F.F. Shi, F.M. Wang, J. Yang, K.M. Feng, L.J. Wang, T.C. Li, X. Zhu, Y.C. Guo","submitted_at":"2019-06-06T07:43:36Z","abstract_excerpt":"In this paper, we propose a real-time free-running time scale based on four remote hydrogen masers. The clocks in the ensemble were scattered around Beijing, connected by urban fiber links using a novel frequency synchronization system. The remote clock ensemble prevents the time scale from potential problems caused by correlation among co-located clocks. Insofar as it is real-time, it fulfills the requirements for applications such as navigation, telecommunications and so on. The free-running time scale is updated every 1200 s, and a disturbance-resistant algorithm makes it robust to fiber li"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1906.02459","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":"2026-05-17T23:39:53Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"kJZun0CtGMld5VhUrirkNIknYLWseWY5NczA2KlLGRbS0V90myWyl6vrGVNrmU1spRf4qwG0eXKiKwNCP8Z5Ag==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-27T13:51:00.120129Z"},"content_sha256":"ecf2bd69dadf804662ab719a3d27025474294f90bb774095af2bdf4e26c188e1","schema_version":"1.0","event_id":"sha256:ecf2bd69dadf804662ab719a3d27025474294f90bb774095af2bdf4e26c188e1"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/RLTZPBRUGESDFC363EDY5XEGB5/bundle.json","state_url":"https://pith.science/pith/RLTZPBRUGESDFC363EDY5XEGB5/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/RLTZPBRUGESDFC363EDY5XEGB5/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":"2026-05-27T13:51:00Z","links":{"resolver":"https://pith.science/pith/RLTZPBRUGESDFC363EDY5XEGB5","bundle":"https://pith.science/pith/RLTZPBRUGESDFC363EDY5XEGB5/bundle.json","state":"https://pith.science/pith/RLTZPBRUGESDFC363EDY5XEGB5/state.json","well_known_bundle":"https://pith.science/.well-known/pith/RLTZPBRUGESDFC363EDY5XEGB5/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2019:RLTZPBRUGESDFC363EDY5XEGB5","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":"ac498a605ecbfca7d3284b94528c1f0f649215695c8023cdbbc0734a95f069be","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.ins-det","submitted_at":"2019-06-06T07:43:36Z","title_canon_sha256":"9cc1576d41a892cd616e5dd782b4f8f1ffd902f214b6cf8d09037a8a0e53c854"},"schema_version":"1.0","source":{"id":"1906.02459","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1906.02459","created_at":"2026-05-17T23:39:53Z"},{"alias_kind":"arxiv_version","alias_value":"1906.02459v1","created_at":"2026-05-17T23:39:53Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1906.02459","created_at":"2026-05-17T23:39:53Z"},{"alias_kind":"pith_short_12","alias_value":"RLTZPBRUGESD","created_at":"2026-05-18T12:33:27Z"},{"alias_kind":"pith_short_16","alias_value":"RLTZPBRUGESDFC36","created_at":"2026-05-18T12:33:27Z"},{"alias_kind":"pith_short_8","alias_value":"RLTZPBRU","created_at":"2026-05-18T12:33:27Z"}],"graph_snapshots":[{"event_id":"sha256:ecf2bd69dadf804662ab719a3d27025474294f90bb774095af2bdf4e26c188e1","target":"graph","created_at":"2026-05-17T23:39:53Z","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":"In this paper, we propose a real-time free-running time scale based on four remote hydrogen masers. The clocks in the ensemble were scattered around Beijing, connected by urban fiber links using a novel frequency synchronization system. The remote clock ensemble prevents the time scale from potential problems caused by correlation among co-located clocks. Insofar as it is real-time, it fulfills the requirements for applications such as navigation, telecommunications and so on. The free-running time scale is updated every 1200 s, and a disturbance-resistant algorithm makes it robust to fiber li","authors_text":"A.M. Zhang, B. Wang, C.H. Han, F.F. Shi, F.M. Wang, J. Yang, K.M. Feng, L.J. Wang, T.C. Li, X. Zhu, Y.C. Guo","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.ins-det","submitted_at":"2019-06-06T07:43:36Z","title":"Real-time free-running time scale with remote clocks on fiber-based frequency network"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1906.02459","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":"sha256:12653b68c1008388ed79d8b3fbea4f769142b8874479c8b93538e43aacd685cc","target":"record","created_at":"2026-05-17T23:39:53Z","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":"ac498a605ecbfca7d3284b94528c1f0f649215695c8023cdbbc0734a95f069be","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.ins-det","submitted_at":"2019-06-06T07:43:36Z","title_canon_sha256":"9cc1576d41a892cd616e5dd782b4f8f1ffd902f214b6cf8d09037a8a0e53c854"},"schema_version":"1.0","source":{"id":"1906.02459","kind":"arxiv","version":1}},"canonical_sha256":"8ae79786343124328b7ed9078edc860f6145c2ed3a47b26dee42080783fb2eed","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"8ae79786343124328b7ed9078edc860f6145c2ed3a47b26dee42080783fb2eed","first_computed_at":"2026-05-17T23:39:53.642824Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-17T23:39:53.642824Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"gxJCa59z9mR4BmXRANASKDMYM0mvSvEOjn+AENrKDdy+uScrRW/wMgdNn263rpXUY/P/Dl7HuUBUamGOGqyuDw==","signature_status":"signed_v1","signed_at":"2026-05-17T23:39:53.643603Z","signed_message":"canonical_sha256_bytes"},"source_id":"1906.02459","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:12653b68c1008388ed79d8b3fbea4f769142b8874479c8b93538e43aacd685cc","sha256:ecf2bd69dadf804662ab719a3d27025474294f90bb774095af2bdf4e26c188e1"],"state_sha256":"6e138ba5c92661a4fcbfdc4a98f81242811fda5c0da2ebe48927a8ddc085efcb"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"Zt0irc0DZ70BjMBpxkMzZXCZzGJV7rXEb1QrBzNM5U9XLmwQPQHR9E/1QfBdT023bVrydBmMvSF/DEgjlhDzCQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-27T13:51:00.123799Z","bundle_sha256":"3a39ba99f054ae527a4c9cf00a0df36a37d7bacdcdeb463b0a4b50ccdc547793"}}