{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2017:2NCH65L5FJ45VS2EBZMC56AEL3","short_pith_number":"pith:2NCH65L5","canonical_record":{"source":{"id":"1703.01082","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.ins-det","submitted_at":"2017-03-03T08:59:02Z","cross_cats_sorted":["hep-ex"],"title_canon_sha256":"af3b949cd4c710ea20b57d063cdea954b7641895fdf5ee8bead829191d48751a","abstract_canon_sha256":"ed692b89030cd514c0c45cb3f4ba417aa196527de2439a74d4df10cb50eb9d08"},"schema_version":"1.0"},"canonical_sha256":"d3447f757d2a79dacb440e582ef8045ed0539491001d010dada4b04b672163d8","source":{"kind":"arxiv","id":"1703.01082","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1703.01082","created_at":"2026-05-18T00:42:43Z"},{"alias_kind":"arxiv_version","alias_value":"1703.01082v2","created_at":"2026-05-18T00:42:43Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1703.01082","created_at":"2026-05-18T00:42:43Z"},{"alias_kind":"pith_short_12","alias_value":"2NCH65L5FJ45","created_at":"2026-05-18T12:30:55Z"},{"alias_kind":"pith_short_16","alias_value":"2NCH65L5FJ45VS2E","created_at":"2026-05-18T12:30:55Z"},{"alias_kind":"pith_short_8","alias_value":"2NCH65L5","created_at":"2026-05-18T12:30:55Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2017:2NCH65L5FJ45VS2EBZMC56AEL3","target":"record","payload":{"canonical_record":{"source":{"id":"1703.01082","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.ins-det","submitted_at":"2017-03-03T08:59:02Z","cross_cats_sorted":["hep-ex"],"title_canon_sha256":"af3b949cd4c710ea20b57d063cdea954b7641895fdf5ee8bead829191d48751a","abstract_canon_sha256":"ed692b89030cd514c0c45cb3f4ba417aa196527de2439a74d4df10cb50eb9d08"},"schema_version":"1.0"},"canonical_sha256":"d3447f757d2a79dacb440e582ef8045ed0539491001d010dada4b04b672163d8","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T00:42:43.812237Z","signature_b64":"7t04qphp4VHUSM60uLzAWDMwkqbqh+3LvFBNOWZHZLxNTYH3uFfFoGmC7rO6t4HgzJ57elIzIYRybo4tg8bmCQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"d3447f757d2a79dacb440e582ef8045ed0539491001d010dada4b04b672163d8","last_reissued_at":"2026-05-18T00:42:43.811710Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T00:42:43.811710Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1703.01082","source_version":2,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T00:42:43Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"aDt4irXFpEQ9WG40QfewM9cN+jzhapQnngPvC3BhTc+jkk1nZ0fz7pRg2XnEkzr8pwdSpsMmNMH1LiAYU4dPBg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-07T15:29:48.305428Z"},"content_sha256":"1f7d2f7c42b6ef42f454d5fd457e6846dafdc7e12b7dcc431aaeda31fee263ed","schema_version":"1.0","event_id":"sha256:1f7d2f7c42b6ef42f454d5fd457e6846dafdc7e12b7dcc431aaeda31fee263ed"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2017:2NCH65L5FJ45VS2EBZMC56AEL3","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Towards implementing multi-channels, ring-oscillator-based, Vernier time-to-digital converter in FPGAs: key design points and construction method","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["hep-ex"],"primary_cat":"physics.ins-det","authors_text":"Ke Cui, Rihong Zhu, Xiangyu Li, Zongkai Liu","submitted_at":"2017-03-03T08:59:02Z","abstract_excerpt":"For TOF positron emission tomography (TOF PET) detectors, time-to-digital converters (TDCs) are essential to resolve the coincidence time of the photon pairs. Recently, an efficient TDC structure called ring-oscillator-based (RO-based) Vernier TDC using carry chains was reported by our team. The method is very promising due to its low linearity error and low resource cost. However, the implementation complexity is rather high especially when moving to multi-channels TDC designs, since this method calls for a manual intervention to the initial fitting results of the compilation software. In thi"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1703.01082","kind":"arxiv","version":2},"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":"2026-05-18T00:42:43Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"R6t3hrh23iuUSAjchQRpIJvS6ybds34ILqjsgF8sENUHlhmcqX3k5kpj26xvbD2ylxPSbK9Q4xK8Yk4pOXhTDw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-07T15:29:48.306137Z"},"content_sha256":"87f0290b9202de20702b3e7998f5bf791226192d3a2214dcad9fd72cd5b05587","schema_version":"1.0","event_id":"sha256:87f0290b9202de20702b3e7998f5bf791226192d3a2214dcad9fd72cd5b05587"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/2NCH65L5FJ45VS2EBZMC56AEL3/bundle.json","state_url":"https://pith.science/pith/2NCH65L5FJ45VS2EBZMC56AEL3/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/2NCH65L5FJ45VS2EBZMC56AEL3/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":"2026-06-07T15:29:48Z","links":{"resolver":"https://pith.science/pith/2NCH65L5FJ45VS2EBZMC56AEL3","bundle":"https://pith.science/pith/2NCH65L5FJ45VS2EBZMC56AEL3/bundle.json","state":"https://pith.science/pith/2NCH65L5FJ45VS2EBZMC56AEL3/state.json","well_known_bundle":"https://pith.science/.well-known/pith/2NCH65L5FJ45VS2EBZMC56AEL3/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2017:2NCH65L5FJ45VS2EBZMC56AEL3","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":"ed692b89030cd514c0c45cb3f4ba417aa196527de2439a74d4df10cb50eb9d08","cross_cats_sorted":["hep-ex"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.ins-det","submitted_at":"2017-03-03T08:59:02Z","title_canon_sha256":"af3b949cd4c710ea20b57d063cdea954b7641895fdf5ee8bead829191d48751a"},"schema_version":"1.0","source":{"id":"1703.01082","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1703.01082","created_at":"2026-05-18T00:42:43Z"},{"alias_kind":"arxiv_version","alias_value":"1703.01082v2","created_at":"2026-05-18T00:42:43Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1703.01082","created_at":"2026-05-18T00:42:43Z"},{"alias_kind":"pith_short_12","alias_value":"2NCH65L5FJ45","created_at":"2026-05-18T12:30:55Z"},{"alias_kind":"pith_short_16","alias_value":"2NCH65L5FJ45VS2E","created_at":"2026-05-18T12:30:55Z"},{"alias_kind":"pith_short_8","alias_value":"2NCH65L5","created_at":"2026-05-18T12:30:55Z"}],"graph_snapshots":[{"event_id":"sha256:87f0290b9202de20702b3e7998f5bf791226192d3a2214dcad9fd72cd5b05587","target":"graph","created_at":"2026-05-18T00:42:43Z","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":"For TOF positron emission tomography (TOF PET) detectors, time-to-digital converters (TDCs) are essential to resolve the coincidence time of the photon pairs. Recently, an efficient TDC structure called ring-oscillator-based (RO-based) Vernier TDC using carry chains was reported by our team. The method is very promising due to its low linearity error and low resource cost. However, the implementation complexity is rather high especially when moving to multi-channels TDC designs, since this method calls for a manual intervention to the initial fitting results of the compilation software. In thi","authors_text":"Ke Cui, Rihong Zhu, Xiangyu Li, Zongkai Liu","cross_cats":["hep-ex"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.ins-det","submitted_at":"2017-03-03T08:59:02Z","title":"Towards implementing multi-channels, ring-oscillator-based, Vernier time-to-digital converter in FPGAs: key design points and construction method"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1703.01082","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":"sha256:1f7d2f7c42b6ef42f454d5fd457e6846dafdc7e12b7dcc431aaeda31fee263ed","target":"record","created_at":"2026-05-18T00:42:43Z","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":"ed692b89030cd514c0c45cb3f4ba417aa196527de2439a74d4df10cb50eb9d08","cross_cats_sorted":["hep-ex"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.ins-det","submitted_at":"2017-03-03T08:59:02Z","title_canon_sha256":"af3b949cd4c710ea20b57d063cdea954b7641895fdf5ee8bead829191d48751a"},"schema_version":"1.0","source":{"id":"1703.01082","kind":"arxiv","version":2}},"canonical_sha256":"d3447f757d2a79dacb440e582ef8045ed0539491001d010dada4b04b672163d8","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"d3447f757d2a79dacb440e582ef8045ed0539491001d010dada4b04b672163d8","first_computed_at":"2026-05-18T00:42:43.811710Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:42:43.811710Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"7t04qphp4VHUSM60uLzAWDMwkqbqh+3LvFBNOWZHZLxNTYH3uFfFoGmC7rO6t4HgzJ57elIzIYRybo4tg8bmCQ==","signature_status":"signed_v1","signed_at":"2026-05-18T00:42:43.812237Z","signed_message":"canonical_sha256_bytes"},"source_id":"1703.01082","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:1f7d2f7c42b6ef42f454d5fd457e6846dafdc7e12b7dcc431aaeda31fee263ed","sha256:87f0290b9202de20702b3e7998f5bf791226192d3a2214dcad9fd72cd5b05587"],"state_sha256":"5f39709bb8c18462366fd86cacad32032c4496ac9e88ef91793f724376cf82ee"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"+MUWIxcAR41QY8XcNARhBFuS0+QPjJCOHcNKjr9hSV2EA30XKOp+N88AIKX4KxpeC+gv3FE4EZLQ3VnfpHduAg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-07T15:29:48.310345Z","bundle_sha256":"a99d21eef2deb652a814971cd6884f8d7dfa1be0f55a2fce7dee743b26e1c6ef"}}