{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2022:GR7A7V2TGVNTI462QAX25GQ742","short_pith_number":"pith:GR7A7V2T","canonical_record":{"source":{"id":"2201.03797","kind":"arxiv","version":2},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"astro-ph.IM","submitted_at":"2022-01-11T06:15:28Z","cross_cats_sorted":[],"title_canon_sha256":"c8989fe4ffbf3f4686b0e5d57c79cb1185201a3486f56ebb3f8012cc2ca5d61b","abstract_canon_sha256":"7d717c31022d382be81e65bc5c752187678493469dafbb6c1b34237aa02d4e88"},"schema_version":"1.0"},"canonical_sha256":"347e0fd753355b3473da802fae9a1fe6ab11eb513e917e3cbfc26ecb3627be25","source":{"kind":"arxiv","id":"2201.03797","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2201.03797","created_at":"2026-07-05T04:45:14Z"},{"alias_kind":"arxiv_version","alias_value":"2201.03797v2","created_at":"2026-07-05T04:45:14Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2201.03797","created_at":"2026-07-05T04:45:14Z"},{"alias_kind":"pith_short_12","alias_value":"GR7A7V2TGVNT","created_at":"2026-07-05T04:45:14Z"},{"alias_kind":"pith_short_16","alias_value":"GR7A7V2TGVNTI462","created_at":"2026-07-05T04:45:14Z"},{"alias_kind":"pith_short_8","alias_value":"GR7A7V2T","created_at":"2026-07-05T04:45:14Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2022:GR7A7V2TGVNTI462QAX25GQ742","target":"record","payload":{"canonical_record":{"source":{"id":"2201.03797","kind":"arxiv","version":2},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"astro-ph.IM","submitted_at":"2022-01-11T06:15:28Z","cross_cats_sorted":[],"title_canon_sha256":"c8989fe4ffbf3f4686b0e5d57c79cb1185201a3486f56ebb3f8012cc2ca5d61b","abstract_canon_sha256":"7d717c31022d382be81e65bc5c752187678493469dafbb6c1b34237aa02d4e88"},"schema_version":"1.0"},"canonical_sha256":"347e0fd753355b3473da802fae9a1fe6ab11eb513e917e3cbfc26ecb3627be25","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T04:45:14.905074Z","signature_b64":"hXgFyBoGi6UhjKOjscWABrBF5yM1FMX4+lUX9q9t8PhfSKdkrP5Xmy3QSLol687/4B9ZP1GgcnsEkLV0+M3iAg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"347e0fd753355b3473da802fae9a1fe6ab11eb513e917e3cbfc26ecb3627be25","last_reissued_at":"2026-07-05T04:45:14.904595Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T04:45:14.904595Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2201.03797","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":"2026-07-05T04:45:14Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"yboRXuSGKkITLcfknp/IvyDgQ0Q64Rm+4bms+kf2zSekY0Jbu9y1s53KQ9sP1HHPKXUZwMKIQxWdXz2Jh1GlDg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-06T19:31:42.567426Z"},"content_sha256":"4e25f609014db5582fc9d8d7b91e92e501b7258cd1df6712b982a30c1ea0f3e3","schema_version":"1.0","event_id":"sha256:4e25f609014db5582fc9d8d7b91e92e501b7258cd1df6712b982a30c1ea0f3e3"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2022:GR7A7V2TGVNTI462QAX25GQ742","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"OmniUV: A Multi-Purpose Simulation Toolkit for VLBI Observation","license":"http://creativecommons.org/licenses/by/4.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.IM","authors_text":"Jian Fu, Lei Liu, Weimin Zheng, Zhijun Xu","submitted_at":"2022-01-11T06:15:28Z","abstract_excerpt":"We present OmniUV, a multi-purpose simulation toolkit for space and ground VLBI observations. It supports various kinds of VLBI stations, including Earth (ground) fixed, Earth orbit, Lunar fixed, Lunar orbit, Moon-Earth and Earth-Sun Lagrange 1 and 2 points, etc. The main functionalities of this toolkit are: (1) Trajectory calculation; (2) Baseline uv calculation, by taking the vailability of each station into account; (3) Visibility simulation for the given uv distribution, source structure and system noise; (4) Image and beam reconstruction. Two scenarios, namely space VLBI network and wide "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2201.03797","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":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/2201.03797/integrity.json","findings":[],"available":true,"detectors_run":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938"},"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":"2026-07-05T04:45:14Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"/MYaLbObmVxgHxzpED2+EEvEA00pFxqkZQqKIuNjC6EsB1EUQuXSWWMVOxGrYSepYLVvoTxMfol5DbSGp1vjBQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-06T19:31:42.568120Z"},"content_sha256":"f8fbe393f9557ea7c96b5e751f2fbaaa685331561b88f5fb7187dfa02edc8875","schema_version":"1.0","event_id":"sha256:f8fbe393f9557ea7c96b5e751f2fbaaa685331561b88f5fb7187dfa02edc8875"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/GR7A7V2TGVNTI462QAX25GQ742/bundle.json","state_url":"https://pith.science/pith/GR7A7V2TGVNTI462QAX25GQ742/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/GR7A7V2TGVNTI462QAX25GQ742/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":"2026-08-06T19:31:42Z","links":{"resolver":"https://pith.science/pith/GR7A7V2TGVNTI462QAX25GQ742","bundle":"https://pith.science/pith/GR7A7V2TGVNTI462QAX25GQ742/bundle.json","state":"https://pith.science/pith/GR7A7V2TGVNTI462QAX25GQ742/state.json","well_known_bundle":"https://pith.science/.well-known/pith/GR7A7V2TGVNTI462QAX25GQ742/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2022:GR7A7V2TGVNTI462QAX25GQ742","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":"7d717c31022d382be81e65bc5c752187678493469dafbb6c1b34237aa02d4e88","cross_cats_sorted":[],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"astro-ph.IM","submitted_at":"2022-01-11T06:15:28Z","title_canon_sha256":"c8989fe4ffbf3f4686b0e5d57c79cb1185201a3486f56ebb3f8012cc2ca5d61b"},"schema_version":"1.0","source":{"id":"2201.03797","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2201.03797","created_at":"2026-07-05T04:45:14Z"},{"alias_kind":"arxiv_version","alias_value":"2201.03797v2","created_at":"2026-07-05T04:45:14Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2201.03797","created_at":"2026-07-05T04:45:14Z"},{"alias_kind":"pith_short_12","alias_value":"GR7A7V2TGVNT","created_at":"2026-07-05T04:45:14Z"},{"alias_kind":"pith_short_16","alias_value":"GR7A7V2TGVNTI462","created_at":"2026-07-05T04:45:14Z"},{"alias_kind":"pith_short_8","alias_value":"GR7A7V2T","created_at":"2026-07-05T04:45:14Z"}],"graph_snapshots":[{"event_id":"sha256:f8fbe393f9557ea7c96b5e751f2fbaaa685331561b88f5fb7187dfa02edc8875","target":"graph","created_at":"2026-07-05T04:45:14Z","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"},"integrity":{"available":true,"clean":true,"detectors_run":[],"endpoint":"/pith/2201.03797/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"We present OmniUV, a multi-purpose simulation toolkit for space and ground VLBI observations. It supports various kinds of VLBI stations, including Earth (ground) fixed, Earth orbit, Lunar fixed, Lunar orbit, Moon-Earth and Earth-Sun Lagrange 1 and 2 points, etc. The main functionalities of this toolkit are: (1) Trajectory calculation; (2) Baseline uv calculation, by taking the vailability of each station into account; (3) Visibility simulation for the given uv distribution, source structure and system noise; (4) Image and beam reconstruction. Two scenarios, namely space VLBI network and wide ","authors_text":"Jian Fu, Lei Liu, Weimin Zheng, Zhijun Xu","cross_cats":[],"headline":"","license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"astro-ph.IM","submitted_at":"2022-01-11T06:15:28Z","title":"OmniUV: A Multi-Purpose Simulation Toolkit for VLBI Observation"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2201.03797","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":"sha256:4e25f609014db5582fc9d8d7b91e92e501b7258cd1df6712b982a30c1ea0f3e3","target":"record","created_at":"2026-07-05T04:45:14Z","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":"7d717c31022d382be81e65bc5c752187678493469dafbb6c1b34237aa02d4e88","cross_cats_sorted":[],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"astro-ph.IM","submitted_at":"2022-01-11T06:15:28Z","title_canon_sha256":"c8989fe4ffbf3f4686b0e5d57c79cb1185201a3486f56ebb3f8012cc2ca5d61b"},"schema_version":"1.0","source":{"id":"2201.03797","kind":"arxiv","version":2}},"canonical_sha256":"347e0fd753355b3473da802fae9a1fe6ab11eb513e917e3cbfc26ecb3627be25","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"347e0fd753355b3473da802fae9a1fe6ab11eb513e917e3cbfc26ecb3627be25","first_computed_at":"2026-07-05T04:45:14.904595Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T04:45:14.904595Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"hXgFyBoGi6UhjKOjscWABrBF5yM1FMX4+lUX9q9t8PhfSKdkrP5Xmy3QSLol687/4B9ZP1GgcnsEkLV0+M3iAg==","signature_status":"signed_v1","signed_at":"2026-07-05T04:45:14.905074Z","signed_message":"canonical_sha256_bytes"},"source_id":"2201.03797","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:4e25f609014db5582fc9d8d7b91e92e501b7258cd1df6712b982a30c1ea0f3e3","sha256:f8fbe393f9557ea7c96b5e751f2fbaaa685331561b88f5fb7187dfa02edc8875"],"state_sha256":"2f5d669bf2547e67c28ee53c42b4ed8b2f9f7980bcb3faed44e12219910e92c3"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"7vAE2560U257EZlqIlhnfTUrIdpxQx8VBvX5fJLQlVHUxBOrE2D2u0/ccpbyNl+6BPHBOp0DeIOtvibvQ/ecDA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-06T19:31:42.571954Z","bundle_sha256":"51d0c3ca8b7697e0eef834b67b3225c3b3effc0d1c79a0b6add2799a91c18157"}}