{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2015:FP3Y3AJV3PJMH2PKCMNEWW5GA5","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":"074aaebe0544e4546aafaf2fca15132b37cd17d31b96ac683af54baf0a867e09","cross_cats_sorted":["physics.atom-ph"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.optics","submitted_at":"2015-11-12T13:28:57Z","title_canon_sha256":"4ba32335a938257773a29b5d3f144b246fd64e4824ce522faaee5ba48d0332bc"},"schema_version":"1.0","source":{"id":"1511.03888","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1511.03888","created_at":"2026-05-18T01:12:00Z"},{"alias_kind":"arxiv_version","alias_value":"1511.03888v2","created_at":"2026-05-18T01:12:00Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1511.03888","created_at":"2026-05-18T01:12:00Z"},{"alias_kind":"pith_short_12","alias_value":"FP3Y3AJV3PJM","created_at":"2026-05-18T12:29:19Z"},{"alias_kind":"pith_short_16","alias_value":"FP3Y3AJV3PJMH2PK","created_at":"2026-05-18T12:29:19Z"},{"alias_kind":"pith_short_8","alias_value":"FP3Y3AJV","created_at":"2026-05-18T12:29:19Z"}],"graph_snapshots":[{"event_id":"sha256:19864a97b55b35aade66432c5644f03289bb3c98c94372d5e6076c4b75d42060","target":"graph","created_at":"2026-05-18T01:12:00Z","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":"Optical clocks are not only powerful tools for prime fundamental research, but are also deemed for the re-definition of the SI base unit second as they now surpass the performance of caesium atomic clocks in both accuracy and stability by more than an order of magnitude. However, an important obstacle in this transition has so far been the limited reliability of the optical clocks that made a continuous realization of a timescale impractical. In this paper, we demonstrate how this situation can be resolved and that a timescale based on an optical clock can be established that is superior to on","authors_text":"A. Al-Masoudi, B. Lipphardt, C. Grebing, C. Lisdat, F. Riehle, S. D\\\"orscher, S. H\\\"afner, S. Weyers, U. Sterr, V. Gerginov","cross_cats":["physics.atom-ph"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.optics","submitted_at":"2015-11-12T13:28:57Z","title":"Realization of a time-scale with an accurate optical lattice clock"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1511.03888","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":"sha256:91458e29349cd3deb42a0e73408e45a1181b0fe4f3b95931dfb761bb008ef0ce","target":"record","created_at":"2026-05-18T01:12:00Z","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":"074aaebe0544e4546aafaf2fca15132b37cd17d31b96ac683af54baf0a867e09","cross_cats_sorted":["physics.atom-ph"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.optics","submitted_at":"2015-11-12T13:28:57Z","title_canon_sha256":"4ba32335a938257773a29b5d3f144b246fd64e4824ce522faaee5ba48d0332bc"},"schema_version":"1.0","source":{"id":"1511.03888","kind":"arxiv","version":2}},"canonical_sha256":"2bf78d8135dbd2c3e9ea131a4b5ba607668f6c2e8c78a31234b29d25938dd68e","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"2bf78d8135dbd2c3e9ea131a4b5ba607668f6c2e8c78a31234b29d25938dd68e","first_computed_at":"2026-05-18T01:12:00.263533Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:12:00.263533Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"IiTUylgaIjE9PQMvgHO0igRDBc4z1TyQZhtJpINIwr76hDGKaNjBysbhrCu5dnV9A3IRDbLNsChdVzOjkzeNAg==","signature_status":"signed_v1","signed_at":"2026-05-18T01:12:00.263896Z","signed_message":"canonical_sha256_bytes"},"source_id":"1511.03888","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:91458e29349cd3deb42a0e73408e45a1181b0fe4f3b95931dfb761bb008ef0ce","sha256:19864a97b55b35aade66432c5644f03289bb3c98c94372d5e6076c4b75d42060"],"state_sha256":"a23a5dca5c46bcdf2a31ad8ea972b22192808187460d705f888c14321295fc1f"}