{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2017:FZ7UHR5NT3R3PZANJAEEFXONPT","short_pith_number":"pith:FZ7UHR5N","canonical_record":{"source":{"id":"1703.04228","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2017-03-13T02:43:12Z","cross_cats_sorted":[],"title_canon_sha256":"41907a36251d2572bdeecc5e614da69c79b21bad28f1c320f80b01e9b7b2c680","abstract_canon_sha256":"6e9c3aed574c88ae53d3a81dc866400e493e02293dfd69e999d6c226152ee4ed"},"schema_version":"1.0"},"canonical_sha256":"2e7f43c7ad9ee3b7e40d480842ddcd7ce40ba297f8027a8867d7ddc3e863b8ee","source":{"kind":"arxiv","id":"1703.04228","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1703.04228","created_at":"2026-05-18T00:42:29Z"},{"alias_kind":"arxiv_version","alias_value":"1703.04228v2","created_at":"2026-05-18T00:42:29Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1703.04228","created_at":"2026-05-18T00:42:29Z"},{"alias_kind":"pith_short_12","alias_value":"FZ7UHR5NT3R3","created_at":"2026-05-18T12:31:15Z"},{"alias_kind":"pith_short_16","alias_value":"FZ7UHR5NT3R3PZAN","created_at":"2026-05-18T12:31:15Z"},{"alias_kind":"pith_short_8","alias_value":"FZ7UHR5N","created_at":"2026-05-18T12:31:15Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2017:FZ7UHR5NT3R3PZANJAEEFXONPT","target":"record","payload":{"canonical_record":{"source":{"id":"1703.04228","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2017-03-13T02:43:12Z","cross_cats_sorted":[],"title_canon_sha256":"41907a36251d2572bdeecc5e614da69c79b21bad28f1c320f80b01e9b7b2c680","abstract_canon_sha256":"6e9c3aed574c88ae53d3a81dc866400e493e02293dfd69e999d6c226152ee4ed"},"schema_version":"1.0"},"canonical_sha256":"2e7f43c7ad9ee3b7e40d480842ddcd7ce40ba297f8027a8867d7ddc3e863b8ee","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T00:42:29.299428Z","signature_b64":"wIbSlDcM2gkl5CoJX0Tc2b1jgpM55aFJy8KRUl4/PaHNsLOZ3rmyKvZ+Qz/Pp6539mdgZADu7szUGf26YZhZAg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"2e7f43c7ad9ee3b7e40d480842ddcd7ce40ba297f8027a8867d7ddc3e863b8ee","last_reissued_at":"2026-05-18T00:42:29.298970Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T00:42:29.298970Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1703.04228","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":"2026-05-18T00:42:29Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"Jx/VIgQu7bNihszjfhNkUJ4MJsliUQWfDETIqlWUVIctpFoEkhDMDBPuzYeYKCXYgO3/LTO2jwSqP+2+sfOvAA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-28T15:27:12.126125Z"},"content_sha256":"0e44dfa1e9cfaba64410833e828744bdf0aa87e72126d35fd784ffa87741bee1","schema_version":"1.0","event_id":"sha256:0e44dfa1e9cfaba64410833e828744bdf0aa87e72126d35fd784ffa87741bee1"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2017:FZ7UHR5NT3R3PZANJAEEFXONPT","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Design and experimental test of an optical vortex coronagraph","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.IM","authors_text":"Chengchao Liu, Deqing Ren, Jiangpei Dou, Yongtian Zhu","submitted_at":"2017-03-13T02:43:12Z","abstract_excerpt":"The optical vortex coronagraph (OVC) is one of the promising ways for direct imaging exoplanets because of its small inner working angle and high throughput. This paper presents the design and laboratory demonstration performance at 633nm and 1520nm of the OVC based on liquid crystal polymers (LCP). Two LCPs has been manufactured in partnership with a commercial vendor. The OVC can deliver a good performance in laboratory test and achieve the contrast of the order 10^-6 at angular distance 3{\\lambda}/D, which is able to image the giant exoplanets at a young stage in combination with extreme ad"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1703.04228","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":"2026-05-18T00:42:29Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"RiaHL0NweTOoP/DzaKyZG8mrllvIzfhEDdrDqxDEjwmSHYTMn0/MnTU7KqCs7Ue5zqlPD3zzFn73PWCBKeLrCQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-28T15:27:12.126772Z"},"content_sha256":"651de258a99f0e01ad63f5524f1cd0c9b186aaabdc1c20c343cfee3628647b04","schema_version":"1.0","event_id":"sha256:651de258a99f0e01ad63f5524f1cd0c9b186aaabdc1c20c343cfee3628647b04"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/FZ7UHR5NT3R3PZANJAEEFXONPT/bundle.json","state_url":"https://pith.science/pith/FZ7UHR5NT3R3PZANJAEEFXONPT/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/FZ7UHR5NT3R3PZANJAEEFXONPT/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":"2026-05-28T15:27:12Z","links":{"resolver":"https://pith.science/pith/FZ7UHR5NT3R3PZANJAEEFXONPT","bundle":"https://pith.science/pith/FZ7UHR5NT3R3PZANJAEEFXONPT/bundle.json","state":"https://pith.science/pith/FZ7UHR5NT3R3PZANJAEEFXONPT/state.json","well_known_bundle":"https://pith.science/.well-known/pith/FZ7UHR5NT3R3PZANJAEEFXONPT/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2017:FZ7UHR5NT3R3PZANJAEEFXONPT","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":"6e9c3aed574c88ae53d3a81dc866400e493e02293dfd69e999d6c226152ee4ed","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2017-03-13T02:43:12Z","title_canon_sha256":"41907a36251d2572bdeecc5e614da69c79b21bad28f1c320f80b01e9b7b2c680"},"schema_version":"1.0","source":{"id":"1703.04228","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1703.04228","created_at":"2026-05-18T00:42:29Z"},{"alias_kind":"arxiv_version","alias_value":"1703.04228v2","created_at":"2026-05-18T00:42:29Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1703.04228","created_at":"2026-05-18T00:42:29Z"},{"alias_kind":"pith_short_12","alias_value":"FZ7UHR5NT3R3","created_at":"2026-05-18T12:31:15Z"},{"alias_kind":"pith_short_16","alias_value":"FZ7UHR5NT3R3PZAN","created_at":"2026-05-18T12:31:15Z"},{"alias_kind":"pith_short_8","alias_value":"FZ7UHR5N","created_at":"2026-05-18T12:31:15Z"}],"graph_snapshots":[{"event_id":"sha256:651de258a99f0e01ad63f5524f1cd0c9b186aaabdc1c20c343cfee3628647b04","target":"graph","created_at":"2026-05-18T00:42:29Z","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":"The optical vortex coronagraph (OVC) is one of the promising ways for direct imaging exoplanets because of its small inner working angle and high throughput. This paper presents the design and laboratory demonstration performance at 633nm and 1520nm of the OVC based on liquid crystal polymers (LCP). Two LCPs has been manufactured in partnership with a commercial vendor. The OVC can deliver a good performance in laboratory test and achieve the contrast of the order 10^-6 at angular distance 3{\\lambda}/D, which is able to image the giant exoplanets at a young stage in combination with extreme ad","authors_text":"Chengchao Liu, Deqing Ren, Jiangpei Dou, Yongtian Zhu","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2017-03-13T02:43:12Z","title":"Design and experimental test of an optical vortex coronagraph"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1703.04228","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":"sha256:0e44dfa1e9cfaba64410833e828744bdf0aa87e72126d35fd784ffa87741bee1","target":"record","created_at":"2026-05-18T00:42:29Z","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":"6e9c3aed574c88ae53d3a81dc866400e493e02293dfd69e999d6c226152ee4ed","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2017-03-13T02:43:12Z","title_canon_sha256":"41907a36251d2572bdeecc5e614da69c79b21bad28f1c320f80b01e9b7b2c680"},"schema_version":"1.0","source":{"id":"1703.04228","kind":"arxiv","version":2}},"canonical_sha256":"2e7f43c7ad9ee3b7e40d480842ddcd7ce40ba297f8027a8867d7ddc3e863b8ee","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"2e7f43c7ad9ee3b7e40d480842ddcd7ce40ba297f8027a8867d7ddc3e863b8ee","first_computed_at":"2026-05-18T00:42:29.298970Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:42:29.298970Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"wIbSlDcM2gkl5CoJX0Tc2b1jgpM55aFJy8KRUl4/PaHNsLOZ3rmyKvZ+Qz/Pp6539mdgZADu7szUGf26YZhZAg==","signature_status":"signed_v1","signed_at":"2026-05-18T00:42:29.299428Z","signed_message":"canonical_sha256_bytes"},"source_id":"1703.04228","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:0e44dfa1e9cfaba64410833e828744bdf0aa87e72126d35fd784ffa87741bee1","sha256:651de258a99f0e01ad63f5524f1cd0c9b186aaabdc1c20c343cfee3628647b04"],"state_sha256":"9becba921a7aa567e80ee5c25b06028e5e217087975db63bd82ce3a96b7ff2bf"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"dCJxv/YYZ1jm4vhY4ocfkgGqBQ8B/+kwHP0hKSw+U8Fcs0G3ij1nRZKZEFtHcKox+NkVSkq6aT4Trv0UKeUBBA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-28T15:27:12.130214Z","bundle_sha256":"256f81d0907091f0e75a442861085ff87ac59c4521287e8eb23edd21f0427af0"}}