{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2018:5YC2RVQT6JMP6KPPOXNOSCLMGD","short_pith_number":"pith:5YC2RVQT","canonical_record":{"source":{"id":"1806.03400","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"eess.SP","submitted_at":"2018-06-09T02:54:25Z","cross_cats_sorted":[],"title_canon_sha256":"d590e492ad214420ca6d977ddeb5343160de81fac654c0e88e377fb23b3c2c30","abstract_canon_sha256":"012f6fbe4f84b19e53e061fd107a4ed1264b318c91fbe3ea6977194aa9c2895b"},"schema_version":"1.0"},"canonical_sha256":"ee05a8d613f258ff29ef75dae9096c30ec7b3b200e3f382e7d41f98d51dc90f9","source":{"kind":"arxiv","id":"1806.03400","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1806.03400","created_at":"2026-05-18T00:13:43Z"},{"alias_kind":"arxiv_version","alias_value":"1806.03400v1","created_at":"2026-05-18T00:13:43Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1806.03400","created_at":"2026-05-18T00:13:43Z"},{"alias_kind":"pith_short_12","alias_value":"5YC2RVQT6JMP","created_at":"2026-05-18T12:32:08Z"},{"alias_kind":"pith_short_16","alias_value":"5YC2RVQT6JMP6KPP","created_at":"2026-05-18T12:32:08Z"},{"alias_kind":"pith_short_8","alias_value":"5YC2RVQT","created_at":"2026-05-18T12:32:08Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2018:5YC2RVQT6JMP6KPPOXNOSCLMGD","target":"record","payload":{"canonical_record":{"source":{"id":"1806.03400","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"eess.SP","submitted_at":"2018-06-09T02:54:25Z","cross_cats_sorted":[],"title_canon_sha256":"d590e492ad214420ca6d977ddeb5343160de81fac654c0e88e377fb23b3c2c30","abstract_canon_sha256":"012f6fbe4f84b19e53e061fd107a4ed1264b318c91fbe3ea6977194aa9c2895b"},"schema_version":"1.0"},"canonical_sha256":"ee05a8d613f258ff29ef75dae9096c30ec7b3b200e3f382e7d41f98d51dc90f9","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T00:13:43.498693Z","signature_b64":"RfzbKowGzVRlOUhQAgxYZeMC7enVpLYzfcaSomNqvW/+DKbLaUwa1LK2QlEpUtqKoaD6v38Pih99dhQGNcDlAw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"ee05a8d613f258ff29ef75dae9096c30ec7b3b200e3f382e7d41f98d51dc90f9","last_reissued_at":"2026-05-18T00:13:43.498049Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T00:13:43.498049Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1806.03400","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":"2026-05-18T00:13:43Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"fazWbD3EyZhcF5P+6vhYWxQLhqGne6RCjMfdkfAQB2G5upTNavZWnK+lzlEahG53/H1uYwTd6i1ExfGcojE8DQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-02T16:50:11.139553Z"},"content_sha256":"3de25144f30556426c60ce325322b4b16eb171f7ed93f0771214c99c834e7fb8","schema_version":"1.0","event_id":"sha256:3de25144f30556426c60ce325322b4b16eb171f7ed93f0771214c99c834e7fb8"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2018:5YC2RVQT6JMP6KPPOXNOSCLMGD","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"A 3.8 ps RMS time synchronization implemented in a 20 nm FPGA","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"eess.SP","authors_text":"Cheng-Zhi Peng, Hong-Bo Xie, Qi Shen, Sheng-Kai Liao, Yang Li","submitted_at":"2018-06-09T02:54:25Z","abstract_excerpt":"A 3.8ps root mean square (RMS) time synchronization implemented in a 20nm fabrication process ultrascale kintex Field Programmable Gate Array (FPGA) is presented. The multichannel high-speed serial transceivers (e.g. GTH) play a key role in a wide range of applications, such as the optical source for quantum key distribution systems. However, owing to the independent clock dividers existed in each transceiver, the random skew would appear among the multiple channels every time the system powers up or resets. A self-phase alignment method provided by Xilinx Corporation could reach a precision w"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1806.03400","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":"2026-05-18T00:13:43Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"tDgDydjUHTDHvPFZ7y16j+inRPhmSCJrR2zWFVPZUNJb1Cv9Tb0dGn+8MmB3yStGKTuLeQ9HE9QP7m4izRtCBA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-02T16:50:11.139893Z"},"content_sha256":"1cb31d62af6509987264e63d7aae2167cea2256e7876153a6e8060e7491df216","schema_version":"1.0","event_id":"sha256:1cb31d62af6509987264e63d7aae2167cea2256e7876153a6e8060e7491df216"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/5YC2RVQT6JMP6KPPOXNOSCLMGD/bundle.json","state_url":"https://pith.science/pith/5YC2RVQT6JMP6KPPOXNOSCLMGD/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/5YC2RVQT6JMP6KPPOXNOSCLMGD/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":"2026-06-02T16:50:11Z","links":{"resolver":"https://pith.science/pith/5YC2RVQT6JMP6KPPOXNOSCLMGD","bundle":"https://pith.science/pith/5YC2RVQT6JMP6KPPOXNOSCLMGD/bundle.json","state":"https://pith.science/pith/5YC2RVQT6JMP6KPPOXNOSCLMGD/state.json","well_known_bundle":"https://pith.science/.well-known/pith/5YC2RVQT6JMP6KPPOXNOSCLMGD/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2018:5YC2RVQT6JMP6KPPOXNOSCLMGD","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":"012f6fbe4f84b19e53e061fd107a4ed1264b318c91fbe3ea6977194aa9c2895b","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"eess.SP","submitted_at":"2018-06-09T02:54:25Z","title_canon_sha256":"d590e492ad214420ca6d977ddeb5343160de81fac654c0e88e377fb23b3c2c30"},"schema_version":"1.0","source":{"id":"1806.03400","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1806.03400","created_at":"2026-05-18T00:13:43Z"},{"alias_kind":"arxiv_version","alias_value":"1806.03400v1","created_at":"2026-05-18T00:13:43Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1806.03400","created_at":"2026-05-18T00:13:43Z"},{"alias_kind":"pith_short_12","alias_value":"5YC2RVQT6JMP","created_at":"2026-05-18T12:32:08Z"},{"alias_kind":"pith_short_16","alias_value":"5YC2RVQT6JMP6KPP","created_at":"2026-05-18T12:32:08Z"},{"alias_kind":"pith_short_8","alias_value":"5YC2RVQT","created_at":"2026-05-18T12:32:08Z"}],"graph_snapshots":[{"event_id":"sha256:1cb31d62af6509987264e63d7aae2167cea2256e7876153a6e8060e7491df216","target":"graph","created_at":"2026-05-18T00:13:43Z","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":"A 3.8ps root mean square (RMS) time synchronization implemented in a 20nm fabrication process ultrascale kintex Field Programmable Gate Array (FPGA) is presented. The multichannel high-speed serial transceivers (e.g. GTH) play a key role in a wide range of applications, such as the optical source for quantum key distribution systems. However, owing to the independent clock dividers existed in each transceiver, the random skew would appear among the multiple channels every time the system powers up or resets. A self-phase alignment method provided by Xilinx Corporation could reach a precision w","authors_text":"Cheng-Zhi Peng, Hong-Bo Xie, Qi Shen, Sheng-Kai Liao, Yang Li","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"eess.SP","submitted_at":"2018-06-09T02:54:25Z","title":"A 3.8 ps RMS time synchronization implemented in a 20 nm FPGA"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1806.03400","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":"sha256:3de25144f30556426c60ce325322b4b16eb171f7ed93f0771214c99c834e7fb8","target":"record","created_at":"2026-05-18T00:13:43Z","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":"012f6fbe4f84b19e53e061fd107a4ed1264b318c91fbe3ea6977194aa9c2895b","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"eess.SP","submitted_at":"2018-06-09T02:54:25Z","title_canon_sha256":"d590e492ad214420ca6d977ddeb5343160de81fac654c0e88e377fb23b3c2c30"},"schema_version":"1.0","source":{"id":"1806.03400","kind":"arxiv","version":1}},"canonical_sha256":"ee05a8d613f258ff29ef75dae9096c30ec7b3b200e3f382e7d41f98d51dc90f9","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"ee05a8d613f258ff29ef75dae9096c30ec7b3b200e3f382e7d41f98d51dc90f9","first_computed_at":"2026-05-18T00:13:43.498049Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:13:43.498049Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"RfzbKowGzVRlOUhQAgxYZeMC7enVpLYzfcaSomNqvW/+DKbLaUwa1LK2QlEpUtqKoaD6v38Pih99dhQGNcDlAw==","signature_status":"signed_v1","signed_at":"2026-05-18T00:13:43.498693Z","signed_message":"canonical_sha256_bytes"},"source_id":"1806.03400","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:3de25144f30556426c60ce325322b4b16eb171f7ed93f0771214c99c834e7fb8","sha256:1cb31d62af6509987264e63d7aae2167cea2256e7876153a6e8060e7491df216"],"state_sha256":"ed2dcf1d8998f55b65213d55f563964d9f353a202e16b06420bad4a4d3c2b36d"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"HC9IomKUWwkYA/PbMrfJD9MjG6zg6cTe8bdSC4i0yUHW0/JCLdPLYB0xnsnHeUcW41DG6Dmb2Ip1Cv+GAi5GAw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-02T16:50:11.141727Z","bundle_sha256":"0343d08402290241adc32116db54b18a0dc886caff98cad9ec49111eccbf9c62"}}