{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2014:ZEKVODQKKPXRTM5QKESOOYSD4B","short_pith_number":"pith:ZEKVODQK","canonical_record":{"source":{"id":"1401.7976","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.atom-ph","submitted_at":"2014-01-29T20:28:54Z","cross_cats_sorted":[],"title_canon_sha256":"4f5029b0c60b3bd4d8d64f3d944d487f0aacd6e16eda073f7da4249f2815115b","abstract_canon_sha256":"eb043aa5c89118a80612f693609c3441ec2ca5ad28e1a226cea21f2e409f2c7f"},"schema_version":"1.0"},"canonical_sha256":"c915570e0a53ef19b3b05124e76243e07c07d60d8dc09a01b03226e1870c80f6","source":{"kind":"arxiv","id":"1401.7976","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1401.7976","created_at":"2026-05-18T03:00:37Z"},{"alias_kind":"arxiv_version","alias_value":"1401.7976v1","created_at":"2026-05-18T03:00:37Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1401.7976","created_at":"2026-05-18T03:00:37Z"},{"alias_kind":"pith_short_12","alias_value":"ZEKVODQKKPXR","created_at":"2026-05-18T12:28:59Z"},{"alias_kind":"pith_short_16","alias_value":"ZEKVODQKKPXRTM5Q","created_at":"2026-05-18T12:28:59Z"},{"alias_kind":"pith_short_8","alias_value":"ZEKVODQK","created_at":"2026-05-18T12:28:59Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2014:ZEKVODQKKPXRTM5QKESOOYSD4B","target":"record","payload":{"canonical_record":{"source":{"id":"1401.7976","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.atom-ph","submitted_at":"2014-01-29T20:28:54Z","cross_cats_sorted":[],"title_canon_sha256":"4f5029b0c60b3bd4d8d64f3d944d487f0aacd6e16eda073f7da4249f2815115b","abstract_canon_sha256":"eb043aa5c89118a80612f693609c3441ec2ca5ad28e1a226cea21f2e409f2c7f"},"schema_version":"1.0"},"canonical_sha256":"c915570e0a53ef19b3b05124e76243e07c07d60d8dc09a01b03226e1870c80f6","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T03:00:37.734640Z","signature_b64":"vEmpNOht1ES9V02zMcaCTs2kBqjbIg0Hojfgs4ErFMkRzcH4h0zff2vAeDMaj8zWMz4KNGs4IHLCG/ouX5pMAQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"c915570e0a53ef19b3b05124e76243e07c07d60d8dc09a01b03226e1870c80f6","last_reissued_at":"2026-05-18T03:00:37.733782Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T03:00:37.733782Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1401.7976","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":"2026-05-18T03:00:37Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"t1grqoL/vQ81yUoN+33O8qAUgwq0ZoT6PL5n3Q0jNRe9awX/zI7BqiR5oaSjgPD8RchcS/c6CeLB24PFy+c4BQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-27T17:39:36.309698Z"},"content_sha256":"4b70a242cf90d434c21308773c4ff9cc64e36434a701eb2663ddde5018ba8486","schema_version":"1.0","event_id":"sha256:4b70a242cf90d434c21308773c4ff9cc64e36434a701eb2663ddde5018ba8486"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2014:ZEKVODQKKPXRTM5QKESOOYSD4B","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Contributing to TAI with a Secondary Representation of the SI Second","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"physics.atom-ph","authors_text":"Andr\\'e Clairon, Jocelyne Gu\\'ena, Michel Abgrall, S\\'ebastien Bize","submitted_at":"2014-01-29T20:28:54Z","abstract_excerpt":"We report the first contribution to the international atomic time (TAI) based on a secondary representation of the SI second. This work is done with the LNE-SYRTE FO2-Rb fountain frequency standard using the $^{87}$Rb ground state hyperfine transition. We describe FO2-Rb and how it is connected to local and international time scales. We report on local measurements of this frequency standard in the SI system, i.e. against primary frequency standards, down to a fractional uncertainty of $4.4\\times 10^{-16}$, and on the establishment of the recommended value for the $^{87}$Rb hyperfine transitio"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1401.7976","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":"2026-05-18T03:00:37Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"DXExVrnnEAPdiTzmo1MRD0kLyQXpUJJ5RBpKLFSfv8faY/lJLiCoZ+D1Kj0Jr20GWOLpxoWg1aNmH9FDrZyiAw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-27T17:39:36.310351Z"},"content_sha256":"4e13ffafc2e35b52b757a1eb360afcff500288ddf52487278105df810fb44888","schema_version":"1.0","event_id":"sha256:4e13ffafc2e35b52b757a1eb360afcff500288ddf52487278105df810fb44888"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/ZEKVODQKKPXRTM5QKESOOYSD4B/bundle.json","state_url":"https://pith.science/pith/ZEKVODQKKPXRTM5QKESOOYSD4B/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/ZEKVODQKKPXRTM5QKESOOYSD4B/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":"2026-05-27T17:39:36Z","links":{"resolver":"https://pith.science/pith/ZEKVODQKKPXRTM5QKESOOYSD4B","bundle":"https://pith.science/pith/ZEKVODQKKPXRTM5QKESOOYSD4B/bundle.json","state":"https://pith.science/pith/ZEKVODQKKPXRTM5QKESOOYSD4B/state.json","well_known_bundle":"https://pith.science/.well-known/pith/ZEKVODQKKPXRTM5QKESOOYSD4B/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2014:ZEKVODQKKPXRTM5QKESOOYSD4B","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":"eb043aa5c89118a80612f693609c3441ec2ca5ad28e1a226cea21f2e409f2c7f","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.atom-ph","submitted_at":"2014-01-29T20:28:54Z","title_canon_sha256":"4f5029b0c60b3bd4d8d64f3d944d487f0aacd6e16eda073f7da4249f2815115b"},"schema_version":"1.0","source":{"id":"1401.7976","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1401.7976","created_at":"2026-05-18T03:00:37Z"},{"alias_kind":"arxiv_version","alias_value":"1401.7976v1","created_at":"2026-05-18T03:00:37Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1401.7976","created_at":"2026-05-18T03:00:37Z"},{"alias_kind":"pith_short_12","alias_value":"ZEKVODQKKPXR","created_at":"2026-05-18T12:28:59Z"},{"alias_kind":"pith_short_16","alias_value":"ZEKVODQKKPXRTM5Q","created_at":"2026-05-18T12:28:59Z"},{"alias_kind":"pith_short_8","alias_value":"ZEKVODQK","created_at":"2026-05-18T12:28:59Z"}],"graph_snapshots":[{"event_id":"sha256:4e13ffafc2e35b52b757a1eb360afcff500288ddf52487278105df810fb44888","target":"graph","created_at":"2026-05-18T03:00:37Z","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":"We report the first contribution to the international atomic time (TAI) based on a secondary representation of the SI second. This work is done with the LNE-SYRTE FO2-Rb fountain frequency standard using the $^{87}$Rb ground state hyperfine transition. We describe FO2-Rb and how it is connected to local and international time scales. We report on local measurements of this frequency standard in the SI system, i.e. against primary frequency standards, down to a fractional uncertainty of $4.4\\times 10^{-16}$, and on the establishment of the recommended value for the $^{87}$Rb hyperfine transitio","authors_text":"Andr\\'e Clairon, Jocelyne Gu\\'ena, Michel Abgrall, S\\'ebastien Bize","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.atom-ph","submitted_at":"2014-01-29T20:28:54Z","title":"Contributing to TAI with a Secondary Representation of the SI Second"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1401.7976","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":"sha256:4b70a242cf90d434c21308773c4ff9cc64e36434a701eb2663ddde5018ba8486","target":"record","created_at":"2026-05-18T03:00:37Z","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":"eb043aa5c89118a80612f693609c3441ec2ca5ad28e1a226cea21f2e409f2c7f","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.atom-ph","submitted_at":"2014-01-29T20:28:54Z","title_canon_sha256":"4f5029b0c60b3bd4d8d64f3d944d487f0aacd6e16eda073f7da4249f2815115b"},"schema_version":"1.0","source":{"id":"1401.7976","kind":"arxiv","version":1}},"canonical_sha256":"c915570e0a53ef19b3b05124e76243e07c07d60d8dc09a01b03226e1870c80f6","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"c915570e0a53ef19b3b05124e76243e07c07d60d8dc09a01b03226e1870c80f6","first_computed_at":"2026-05-18T03:00:37.733782Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T03:00:37.733782Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"vEmpNOht1ES9V02zMcaCTs2kBqjbIg0Hojfgs4ErFMkRzcH4h0zff2vAeDMaj8zWMz4KNGs4IHLCG/ouX5pMAQ==","signature_status":"signed_v1","signed_at":"2026-05-18T03:00:37.734640Z","signed_message":"canonical_sha256_bytes"},"source_id":"1401.7976","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:4b70a242cf90d434c21308773c4ff9cc64e36434a701eb2663ddde5018ba8486","sha256:4e13ffafc2e35b52b757a1eb360afcff500288ddf52487278105df810fb44888"],"state_sha256":"339671d8c3e76857162d97fb75c7d5b5ea587680432f36654a1a32c2ae81e244"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"uTwSoatBGPbOoslk0BigcWGNlq+HkMBYvf67OhmCkadcpd+P3tyY6w16vvVoDoinVmbwK+grMEiVmNRm62+IBg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-27T17:39:36.314108Z","bundle_sha256":"6c0fb9d9e7c87a1319571134f9fba7ef6d3d5d9f6f1441cfee5ea9360bec3910"}}