{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2016:M7VOACE24HSVSGAQX2AT5GDKNO","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":"4bc6735ab996d289fc33c3b8fbd312906080cf9170f6098fb377a8304b188c18","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2016-03-30T20:45:23Z","title_canon_sha256":"e2fcded8b118a84700e439d28d2558bdfb7ab0ffc34c3f374e023be470e245bc"},"schema_version":"1.0","source":{"id":"1603.09374","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1603.09374","created_at":"2026-05-18T01:17:58Z"},{"alias_kind":"arxiv_version","alias_value":"1603.09374v1","created_at":"2026-05-18T01:17:58Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1603.09374","created_at":"2026-05-18T01:17:58Z"},{"alias_kind":"pith_short_12","alias_value":"M7VOACE24HSV","created_at":"2026-05-18T12:30:29Z"},{"alias_kind":"pith_short_16","alias_value":"M7VOACE24HSVSGAQ","created_at":"2026-05-18T12:30:29Z"},{"alias_kind":"pith_short_8","alias_value":"M7VOACE2","created_at":"2026-05-18T12:30:29Z"}],"graph_snapshots":[{"event_id":"sha256:89d72d50bc97e3e012182b1fac221728cf7d0060941589e45d3acd79545f497b","target":"graph","created_at":"2026-05-18T01:17:58Z","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 the fabrication and experimental demonstration of three free-standing binary shaped pupil mask coronagraphs, which are applicable for telescopes with partially obscured pupils. Three masks, designed to be complementary (labeled Mask-A, Mask-B, and Mask-C), were formed in 5 micron thick nickel. The design of Mask-A is based on a one-dimensional barcode mask. The design principle of Mask-B is similar, but has a smaller inner working angle and a lower contrast than Mask-A. Mask-C is based on a concentric ring mask and provides the widest dark region and a symmetric point spread functio","authors_text":"Aoi Takahashi, Kanae Haze, Keigo Enya, Lyu Abe, Takayuki Kotani, Tomoyasu Yamamuro","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2016-03-30T20:45:23Z","title":"Experimental demonstration of binary shaped pupil mask coronagraphs for telescopes with obscured pupils"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1603.09374","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:eec026801ac60b20345ccc4bb7d07141252553a7bb5396115aa612f2f42a2dfd","target":"record","created_at":"2026-05-18T01:17:58Z","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":"4bc6735ab996d289fc33c3b8fbd312906080cf9170f6098fb377a8304b188c18","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2016-03-30T20:45:23Z","title_canon_sha256":"e2fcded8b118a84700e439d28d2558bdfb7ab0ffc34c3f374e023be470e245bc"},"schema_version":"1.0","source":{"id":"1603.09374","kind":"arxiv","version":1}},"canonical_sha256":"67eae0089ae1e5591810be813e986a6b95c3c2ebdeafda5231adda888f01c44c","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"67eae0089ae1e5591810be813e986a6b95c3c2ebdeafda5231adda888f01c44c","first_computed_at":"2026-05-18T01:17:58.835693Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:17:58.835693Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"x/C2tZWiyqTecyis4NzJASZyhyTFd49ROPpkTx12VcD2DujlJqyJzx2abCyt9pyhNLIXu6vXcroT33AFErchBw==","signature_status":"signed_v1","signed_at":"2026-05-18T01:17:58.836345Z","signed_message":"canonical_sha256_bytes"},"source_id":"1603.09374","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:eec026801ac60b20345ccc4bb7d07141252553a7bb5396115aa612f2f42a2dfd","sha256:89d72d50bc97e3e012182b1fac221728cf7d0060941589e45d3acd79545f497b"],"state_sha256":"bccbda4c14e9414890907db53eafaf8cf85542d4ab8690bbac5809c4fbb89f30"}