{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2018:HCISH4DPAFIZL6C4HZABWBZO6X","short_pith_number":"pith:HCISH4DP","canonical_record":{"source":{"id":"1803.10693","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2018-03-28T15:49:36Z","cross_cats_sorted":["astro-ph.EP"],"title_canon_sha256":"02df0badd8acc73b24cc43801975ec91a05c3ea14cde5ac795a2a4077ec9ca7e","abstract_canon_sha256":"3b32e045ffb76334c097ede1fefef9110e1803dee776ff5184d70b61b71c52e2"},"schema_version":"1.0"},"canonical_sha256":"389123f06f015195f85c3e401b072ef5f4d0e7436173e8bc8fa099ebec21069e","source":{"kind":"arxiv","id":"1803.10693","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1803.10693","created_at":"2026-05-18T00:19:54Z"},{"alias_kind":"arxiv_version","alias_value":"1803.10693v1","created_at":"2026-05-18T00:19:54Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1803.10693","created_at":"2026-05-18T00:19:54Z"},{"alias_kind":"pith_short_12","alias_value":"HCISH4DPAFIZ","created_at":"2026-05-18T12:32:28Z"},{"alias_kind":"pith_short_16","alias_value":"HCISH4DPAFIZL6C4","created_at":"2026-05-18T12:32:28Z"},{"alias_kind":"pith_short_8","alias_value":"HCISH4DP","created_at":"2026-05-18T12:32:28Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2018:HCISH4DPAFIZL6C4HZABWBZO6X","target":"record","payload":{"canonical_record":{"source":{"id":"1803.10693","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2018-03-28T15:49:36Z","cross_cats_sorted":["astro-ph.EP"],"title_canon_sha256":"02df0badd8acc73b24cc43801975ec91a05c3ea14cde5ac795a2a4077ec9ca7e","abstract_canon_sha256":"3b32e045ffb76334c097ede1fefef9110e1803dee776ff5184d70b61b71c52e2"},"schema_version":"1.0"},"canonical_sha256":"389123f06f015195f85c3e401b072ef5f4d0e7436173e8bc8fa099ebec21069e","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T00:19:54.441301Z","signature_b64":"4Ry1RhJhKMo/V03UuDU82BPIPtzUf1cddgsWl05RpqI3fIhMtZVcnkw3zk9Es/TcgbNNYIze3MHeIZTkyTKKAw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"389123f06f015195f85c3e401b072ef5f4d0e7436173e8bc8fa099ebec21069e","last_reissued_at":"2026-05-18T00:19:54.440594Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T00:19:54.440594Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1803.10693","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":"2026-05-18T00:19:54Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"hIgJ+kzO3pLdQrVfc8tiRCPylezMOE0aXc9/RvFRs/EVd/najG12eoY046UqC0XLe8eekx4DKeKt0PyXFYunDA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-01T16:21:32.945442Z"},"content_sha256":"d9394527ef66b4917e554b2183e6a31307b277f38d2cbc420ec1ba4eb2e94c21","schema_version":"1.0","event_id":"sha256:d9394527ef66b4917e554b2183e6a31307b277f38d2cbc420ec1ba4eb2e94c21"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2018:HCISH4DPAFIZL6C4HZABWBZO6X","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"The Single-mode Complex Amplitude Refinement (SCAR) coronagraph: II. Lab verification, and toward the characterization of Proxima b","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.EP"],"primary_cat":"astro-ph.IM","authors_text":"C. U. Keller, D. S. Doelman, E. H. Por, F. Snik, M. A. Kenworthy, M. J. Escuti, S. Y. Haffert","submitted_at":"2018-03-28T15:49:36Z","abstract_excerpt":"We present the monochromatic lab verification of the newly developed SCAR coronagraph that combines a phase plate (PP) in the pupil with a microlens-fed single-mode fiber array in the focal plane. The two SCAR designs that have been measured, create respectively a 360 degree and 180 degree dark region from 0.8-2.4 \\lambda/D around the star. The 360 SCAR has been designed for a clear aperture and the 180 SCAR has been designed for a realistic aperture with central obscuration and spiders. The 360 SCAR creates a measured stellar null of $2-3 \\times 10^{-4}$ , and the 180 SCAR reaches a null of $"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1803.10693","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":"2026-05-18T00:19:54Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"JLQAwupSBRka/TZN54DQO942bS5JjELuTk1UxIssrLtbpVPAFaCPH2F6s1O8/DuoPB0ZStbkN/jg6o7gK+TgCg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-01T16:21:32.945782Z"},"content_sha256":"a7e727423973482ef93cd379971db1c61c32ecd56d7444c0961a4d539edd511e","schema_version":"1.0","event_id":"sha256:a7e727423973482ef93cd379971db1c61c32ecd56d7444c0961a4d539edd511e"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/HCISH4DPAFIZL6C4HZABWBZO6X/bundle.json","state_url":"https://pith.science/pith/HCISH4DPAFIZL6C4HZABWBZO6X/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/HCISH4DPAFIZL6C4HZABWBZO6X/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":"2026-06-01T16:21:32Z","links":{"resolver":"https://pith.science/pith/HCISH4DPAFIZL6C4HZABWBZO6X","bundle":"https://pith.science/pith/HCISH4DPAFIZL6C4HZABWBZO6X/bundle.json","state":"https://pith.science/pith/HCISH4DPAFIZL6C4HZABWBZO6X/state.json","well_known_bundle":"https://pith.science/.well-known/pith/HCISH4DPAFIZL6C4HZABWBZO6X/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2018:HCISH4DPAFIZL6C4HZABWBZO6X","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":"3b32e045ffb76334c097ede1fefef9110e1803dee776ff5184d70b61b71c52e2","cross_cats_sorted":["astro-ph.EP"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2018-03-28T15:49:36Z","title_canon_sha256":"02df0badd8acc73b24cc43801975ec91a05c3ea14cde5ac795a2a4077ec9ca7e"},"schema_version":"1.0","source":{"id":"1803.10693","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1803.10693","created_at":"2026-05-18T00:19:54Z"},{"alias_kind":"arxiv_version","alias_value":"1803.10693v1","created_at":"2026-05-18T00:19:54Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1803.10693","created_at":"2026-05-18T00:19:54Z"},{"alias_kind":"pith_short_12","alias_value":"HCISH4DPAFIZ","created_at":"2026-05-18T12:32:28Z"},{"alias_kind":"pith_short_16","alias_value":"HCISH4DPAFIZL6C4","created_at":"2026-05-18T12:32:28Z"},{"alias_kind":"pith_short_8","alias_value":"HCISH4DP","created_at":"2026-05-18T12:32:28Z"}],"graph_snapshots":[{"event_id":"sha256:a7e727423973482ef93cd379971db1c61c32ecd56d7444c0961a4d539edd511e","target":"graph","created_at":"2026-05-18T00:19:54Z","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 monochromatic lab verification of the newly developed SCAR coronagraph that combines a phase plate (PP) in the pupil with a microlens-fed single-mode fiber array in the focal plane. The two SCAR designs that have been measured, create respectively a 360 degree and 180 degree dark region from 0.8-2.4 \\lambda/D around the star. The 360 SCAR has been designed for a clear aperture and the 180 SCAR has been designed for a realistic aperture with central obscuration and spiders. The 360 SCAR creates a measured stellar null of $2-3 \\times 10^{-4}$ , and the 180 SCAR reaches a null of $","authors_text":"C. U. Keller, D. S. Doelman, E. H. Por, F. Snik, M. A. Kenworthy, M. J. Escuti, S. Y. Haffert","cross_cats":["astro-ph.EP"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2018-03-28T15:49:36Z","title":"The Single-mode Complex Amplitude Refinement (SCAR) coronagraph: II. Lab verification, and toward the characterization of Proxima b"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1803.10693","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:d9394527ef66b4917e554b2183e6a31307b277f38d2cbc420ec1ba4eb2e94c21","target":"record","created_at":"2026-05-18T00:19:54Z","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":"3b32e045ffb76334c097ede1fefef9110e1803dee776ff5184d70b61b71c52e2","cross_cats_sorted":["astro-ph.EP"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2018-03-28T15:49:36Z","title_canon_sha256":"02df0badd8acc73b24cc43801975ec91a05c3ea14cde5ac795a2a4077ec9ca7e"},"schema_version":"1.0","source":{"id":"1803.10693","kind":"arxiv","version":1}},"canonical_sha256":"389123f06f015195f85c3e401b072ef5f4d0e7436173e8bc8fa099ebec21069e","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"389123f06f015195f85c3e401b072ef5f4d0e7436173e8bc8fa099ebec21069e","first_computed_at":"2026-05-18T00:19:54.440594Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:19:54.440594Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"4Ry1RhJhKMo/V03UuDU82BPIPtzUf1cddgsWl05RpqI3fIhMtZVcnkw3zk9Es/TcgbNNYIze3MHeIZTkyTKKAw==","signature_status":"signed_v1","signed_at":"2026-05-18T00:19:54.441301Z","signed_message":"canonical_sha256_bytes"},"source_id":"1803.10693","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:d9394527ef66b4917e554b2183e6a31307b277f38d2cbc420ec1ba4eb2e94c21","sha256:a7e727423973482ef93cd379971db1c61c32ecd56d7444c0961a4d539edd511e"],"state_sha256":"0045d4e57875f9b7f2f089298737c2279abea600b15532dabfa1d86542b17bef"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"MnIsC3CNVwfSDf6yGKv8dNfNOTHuelaFPgiLRajfV2DEQ9OEPUtLzDlIol7v4AItALI6s92zaFoB0TjvtpB7Bw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-01T16:21:32.947611Z","bundle_sha256":"02261b262b21d88df478da812ee1b3efca68aee62b7d340b290e2f050a1e2792"}}