{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2018:XBYP7XA3OTMLK4W7YGZPDR7WJ7","short_pith_number":"pith:XBYP7XA3","canonical_record":{"source":{"id":"1802.07567","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by-sa/4.0/","primary_cat":"physics.optics","submitted_at":"2018-02-21T13:50:35Z","cross_cats_sorted":[],"title_canon_sha256":"dcb874b59cdd8f4ade1a99013946acebf8973d0784b9677b86bc4385ffc4d689","abstract_canon_sha256":"e333d0588f4f8a39a4eed7ef61bfe7213edcee73a779cd21cf66bde5cc6c0c2d"},"schema_version":"1.0"},"canonical_sha256":"b870ffdc1b74d8b572dfc1b2f1c7f64fe25c306344c06c0d5ad0934df212d842","source":{"kind":"arxiv","id":"1802.07567","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1802.07567","created_at":"2026-05-18T00:14:59Z"},{"alias_kind":"arxiv_version","alias_value":"1802.07567v1","created_at":"2026-05-18T00:14:59Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1802.07567","created_at":"2026-05-18T00:14:59Z"},{"alias_kind":"pith_short_12","alias_value":"XBYP7XA3OTML","created_at":"2026-05-18T12:33:01Z"},{"alias_kind":"pith_short_16","alias_value":"XBYP7XA3OTMLK4W7","created_at":"2026-05-18T12:33:01Z"},{"alias_kind":"pith_short_8","alias_value":"XBYP7XA3","created_at":"2026-05-18T12:33:01Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2018:XBYP7XA3OTMLK4W7YGZPDR7WJ7","target":"record","payload":{"canonical_record":{"source":{"id":"1802.07567","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by-sa/4.0/","primary_cat":"physics.optics","submitted_at":"2018-02-21T13:50:35Z","cross_cats_sorted":[],"title_canon_sha256":"dcb874b59cdd8f4ade1a99013946acebf8973d0784b9677b86bc4385ffc4d689","abstract_canon_sha256":"e333d0588f4f8a39a4eed7ef61bfe7213edcee73a779cd21cf66bde5cc6c0c2d"},"schema_version":"1.0"},"canonical_sha256":"b870ffdc1b74d8b572dfc1b2f1c7f64fe25c306344c06c0d5ad0934df212d842","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T00:14:59.473609Z","signature_b64":"h+xFRv3UXU+W/d4HD0pZkp5LX0BtRVW8j/pUpzmmKTX6MQbMiHoFmw6HztIG1bkOVp3FGYuPzUsPUDXxkilZDA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"b870ffdc1b74d8b572dfc1b2f1c7f64fe25c306344c06c0d5ad0934df212d842","last_reissued_at":"2026-05-18T00:14:59.473052Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T00:14:59.473052Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1802.07567","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":"2026-05-18T00:14:59Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"XK9t/M5fRynj3pMt8hgx8Fj1wWF8XZHfIDZboWTANt7VKzuPZ1t+BT3XD27eZVzuthB/CnGZcUWsAmErdvPhBg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-21T16:09:15.201874Z"},"content_sha256":"390f00f82e84219b6c79e46879c8d730f238696fb65b5fde82f8c1f22b7b1bc8","schema_version":"1.0","event_id":"sha256:390f00f82e84219b6c79e46879c8d730f238696fb65b5fde82f8c1f22b7b1bc8"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2018:XBYP7XA3OTMLK4W7YGZPDR7WJ7","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Measurement of optical to electrical and electrical to optical delays with ps-level uncertainty","license":"http://creativecommons.org/licenses/by-sa/4.0/","headline":"","cross_cats":[],"primary_cat":"physics.optics","authors_text":"H.Z. Peek, J.C.J. Koelemeij, P.P.M. Jansweijer, T.J. Pinkert","submitted_at":"2018-02-21T13:50:35Z","abstract_excerpt":"We present a new measurement principle to determine the absolute time delay of a waveform from an optical reference plane to an electrical reference plane and vice versa. We demonstrate a method based on this principle with 2 ps uncertainty. This method can be used to perform accurate time delay determinations of optical transceivers used in fibre-optic time-dissemination equipment. As a result the time scales in optical and electrical domain can be related to each other with the same uncertainty. We expect this method to break new grounds in high-accuracy time transfer and absolute calibratio"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1802.07567","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":"2026-05-18T00:14:59Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"oaS89nmDsEbk5D/f4N4fnao57WQn3YueZk5H9Vw8JwLngLlZwt9r2S2oElTYGLoz2lyXJo9ixWABYkogM3bdCw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-21T16:09:15.202254Z"},"content_sha256":"1b8b613d0bf2ad152f248c49deadcd3dff4408d25c57b12606b06f979c7a0faa","schema_version":"1.0","event_id":"sha256:1b8b613d0bf2ad152f248c49deadcd3dff4408d25c57b12606b06f979c7a0faa"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/XBYP7XA3OTMLK4W7YGZPDR7WJ7/bundle.json","state_url":"https://pith.science/pith/XBYP7XA3OTMLK4W7YGZPDR7WJ7/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/XBYP7XA3OTMLK4W7YGZPDR7WJ7/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":"2026-05-21T16:09:15Z","links":{"resolver":"https://pith.science/pith/XBYP7XA3OTMLK4W7YGZPDR7WJ7","bundle":"https://pith.science/pith/XBYP7XA3OTMLK4W7YGZPDR7WJ7/bundle.json","state":"https://pith.science/pith/XBYP7XA3OTMLK4W7YGZPDR7WJ7/state.json","well_known_bundle":"https://pith.science/.well-known/pith/XBYP7XA3OTMLK4W7YGZPDR7WJ7/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2018:XBYP7XA3OTMLK4W7YGZPDR7WJ7","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":"e333d0588f4f8a39a4eed7ef61bfe7213edcee73a779cd21cf66bde5cc6c0c2d","cross_cats_sorted":[],"license":"http://creativecommons.org/licenses/by-sa/4.0/","primary_cat":"physics.optics","submitted_at":"2018-02-21T13:50:35Z","title_canon_sha256":"dcb874b59cdd8f4ade1a99013946acebf8973d0784b9677b86bc4385ffc4d689"},"schema_version":"1.0","source":{"id":"1802.07567","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1802.07567","created_at":"2026-05-18T00:14:59Z"},{"alias_kind":"arxiv_version","alias_value":"1802.07567v1","created_at":"2026-05-18T00:14:59Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1802.07567","created_at":"2026-05-18T00:14:59Z"},{"alias_kind":"pith_short_12","alias_value":"XBYP7XA3OTML","created_at":"2026-05-18T12:33:01Z"},{"alias_kind":"pith_short_16","alias_value":"XBYP7XA3OTMLK4W7","created_at":"2026-05-18T12:33:01Z"},{"alias_kind":"pith_short_8","alias_value":"XBYP7XA3","created_at":"2026-05-18T12:33:01Z"}],"graph_snapshots":[{"event_id":"sha256:1b8b613d0bf2ad152f248c49deadcd3dff4408d25c57b12606b06f979c7a0faa","target":"graph","created_at":"2026-05-18T00:14:59Z","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":"We present a new measurement principle to determine the absolute time delay of a waveform from an optical reference plane to an electrical reference plane and vice versa. We demonstrate a method based on this principle with 2 ps uncertainty. This method can be used to perform accurate time delay determinations of optical transceivers used in fibre-optic time-dissemination equipment. As a result the time scales in optical and electrical domain can be related to each other with the same uncertainty. We expect this method to break new grounds in high-accuracy time transfer and absolute calibratio","authors_text":"H.Z. Peek, J.C.J. Koelemeij, P.P.M. Jansweijer, T.J. Pinkert","cross_cats":[],"headline":"","license":"http://creativecommons.org/licenses/by-sa/4.0/","primary_cat":"physics.optics","submitted_at":"2018-02-21T13:50:35Z","title":"Measurement of optical to electrical and electrical to optical delays with ps-level uncertainty"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1802.07567","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":"sha256:390f00f82e84219b6c79e46879c8d730f238696fb65b5fde82f8c1f22b7b1bc8","target":"record","created_at":"2026-05-18T00:14:59Z","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":"e333d0588f4f8a39a4eed7ef61bfe7213edcee73a779cd21cf66bde5cc6c0c2d","cross_cats_sorted":[],"license":"http://creativecommons.org/licenses/by-sa/4.0/","primary_cat":"physics.optics","submitted_at":"2018-02-21T13:50:35Z","title_canon_sha256":"dcb874b59cdd8f4ade1a99013946acebf8973d0784b9677b86bc4385ffc4d689"},"schema_version":"1.0","source":{"id":"1802.07567","kind":"arxiv","version":1}},"canonical_sha256":"b870ffdc1b74d8b572dfc1b2f1c7f64fe25c306344c06c0d5ad0934df212d842","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"b870ffdc1b74d8b572dfc1b2f1c7f64fe25c306344c06c0d5ad0934df212d842","first_computed_at":"2026-05-18T00:14:59.473052Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:14:59.473052Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"h+xFRv3UXU+W/d4HD0pZkp5LX0BtRVW8j/pUpzmmKTX6MQbMiHoFmw6HztIG1bkOVp3FGYuPzUsPUDXxkilZDA==","signature_status":"signed_v1","signed_at":"2026-05-18T00:14:59.473609Z","signed_message":"canonical_sha256_bytes"},"source_id":"1802.07567","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:390f00f82e84219b6c79e46879c8d730f238696fb65b5fde82f8c1f22b7b1bc8","sha256:1b8b613d0bf2ad152f248c49deadcd3dff4408d25c57b12606b06f979c7a0faa"],"state_sha256":"9351c0de293c3cad5db1109725f5a82bc96c7014a79317f3060524e1638ff2bf"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"SiGUodta0UYSPeInyBwtQjLdnMb6/7lWiWZr7lC8hEM/Eg9IpRFO0aZ5zJHnV7+rFmlSJ74isf4XbdnV35ZtCQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-21T16:09:15.205161Z","bundle_sha256":"34265ff860387a140ece4b5b83853e2003323d68685563dd45878882495323a2"}}