{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2019:KPZV5K3KEUQ6LBWCRAKHAGRKJA","short_pith_number":"pith:KPZV5K3K","canonical_record":{"source":{"id":"1908.03587","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by-nc-sa/4.0/","primary_cat":"astro-ph.IM","submitted_at":"2019-08-09T18:09:50Z","cross_cats_sorted":["astro-ph.SR"],"title_canon_sha256":"7ff4f109374ab5295233983278b24f80fca397f4335c84803fb48ef87c951e6e","abstract_canon_sha256":"e556a37dd33ea3fa96c8837612364c7d059bb008974aaba0729cea2a58e9a5d2"},"schema_version":"1.0"},"canonical_sha256":"53f35eab6a2521e586c28814701a2a48171bc14b919a9af22091a6e63afc4c81","source":{"kind":"arxiv","id":"1908.03587","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1908.03587","created_at":"2026-07-04T23:52:42Z"},{"alias_kind":"arxiv_version","alias_value":"1908.03587v1","created_at":"2026-07-04T23:52:42Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1908.03587","created_at":"2026-07-04T23:52:42Z"},{"alias_kind":"pith_short_12","alias_value":"KPZV5K3KEUQ6","created_at":"2026-07-04T23:52:42Z"},{"alias_kind":"pith_short_16","alias_value":"KPZV5K3KEUQ6LBWC","created_at":"2026-07-04T23:52:42Z"},{"alias_kind":"pith_short_8","alias_value":"KPZV5K3K","created_at":"2026-07-04T23:52:42Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2019:KPZV5K3KEUQ6LBWCRAKHAGRKJA","target":"record","payload":{"canonical_record":{"source":{"id":"1908.03587","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by-nc-sa/4.0/","primary_cat":"astro-ph.IM","submitted_at":"2019-08-09T18:09:50Z","cross_cats_sorted":["astro-ph.SR"],"title_canon_sha256":"7ff4f109374ab5295233983278b24f80fca397f4335c84803fb48ef87c951e6e","abstract_canon_sha256":"e556a37dd33ea3fa96c8837612364c7d059bb008974aaba0729cea2a58e9a5d2"},"schema_version":"1.0"},"canonical_sha256":"53f35eab6a2521e586c28814701a2a48171bc14b919a9af22091a6e63afc4c81","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-04T23:52:42.255976Z","signature_b64":"dO1xBTNiqyi5Qg3Mo1FL3ecubYml0Jgiev/o/h3agqCfzgbsDr58B2IzEMVHs+P9SyJorB2CI4acLfLlZ34AAA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"53f35eab6a2521e586c28814701a2a48171bc14b919a9af22091a6e63afc4c81","last_reissued_at":"2026-07-04T23:52:42.255507Z","signature_status":"signed_v1","first_computed_at":"2026-07-04T23:52:42.255507Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1908.03587","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":"2026-07-04T23:52:42Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"knSnAD8SyLRHqmiWNCz5KZqQGltqYweASr4cm64T8t9O2n9JODHCcF+zvHRERDQV7iAe9FmqmO3isFoXbYlBBw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-18T10:40:40.503962Z"},"content_sha256":"319a5df82935377caf7d59e6795a4434b45e6321ad5ef6203eb7bbfb80b3e9fe","schema_version":"1.0","event_id":"sha256:319a5df82935377caf7d59e6795a4434b45e6321ad5ef6203eb7bbfb80b3e9fe"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2019:KPZV5K3KEUQ6LBWCRAKHAGRKJA","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Astrophysical measurements with the VERITAS Stellar Intensity Interferometer","license":"http://creativecommons.org/licenses/by-nc-sa/4.0/","headline":"","cross_cats":["astro-ph.SR"],"primary_cat":"astro-ph.IM","authors_text":"N. Matthews (for the VERITAS Collaboration), S. LeBohec","submitted_at":"2019-08-09T18:09:50Z","abstract_excerpt":"Imaging Atmospheric Cherenkov Telescopes have long been viewed as potential light collectors to be used for long baseline optical intensity interferometry observations. Intensity interferometry, as implemented with Cherenkov telescopes, is well suited for studying the spatial structure of stars of O/B/A stellar types at short optical wavelengths. Such observations complement those with the current generation of optical amplitude interferometers, which are typically restricted to longer wavelengths. Dedicated intensity interferometry instrumentation has been developed for the VERITAS observator"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1908.03587","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":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/1908.03587/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":"2026-07-04T23:52:42Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"PxsQO8C5RddrSLjn52DvP+6rAWq6kd5nKqwGrSpBl1wErLj7deuYIeqLo5sHJtTF/5803cxRV/PGImBZvKX2BQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-18T10:40:40.504659Z"},"content_sha256":"d800a22c99ab0d653f888257af994e38553ef76c07f530f45907846e5c9318f6","schema_version":"1.0","event_id":"sha256:d800a22c99ab0d653f888257af994e38553ef76c07f530f45907846e5c9318f6"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/KPZV5K3KEUQ6LBWCRAKHAGRKJA/bundle.json","state_url":"https://pith.science/pith/KPZV5K3KEUQ6LBWCRAKHAGRKJA/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/KPZV5K3KEUQ6LBWCRAKHAGRKJA/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":"2026-08-18T10:40:40Z","links":{"resolver":"https://pith.science/pith/KPZV5K3KEUQ6LBWCRAKHAGRKJA","bundle":"https://pith.science/pith/KPZV5K3KEUQ6LBWCRAKHAGRKJA/bundle.json","state":"https://pith.science/pith/KPZV5K3KEUQ6LBWCRAKHAGRKJA/state.json","well_known_bundle":"https://pith.science/.well-known/pith/KPZV5K3KEUQ6LBWCRAKHAGRKJA/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2019:KPZV5K3KEUQ6LBWCRAKHAGRKJA","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":"e556a37dd33ea3fa96c8837612364c7d059bb008974aaba0729cea2a58e9a5d2","cross_cats_sorted":["astro-ph.SR"],"license":"http://creativecommons.org/licenses/by-nc-sa/4.0/","primary_cat":"astro-ph.IM","submitted_at":"2019-08-09T18:09:50Z","title_canon_sha256":"7ff4f109374ab5295233983278b24f80fca397f4335c84803fb48ef87c951e6e"},"schema_version":"1.0","source":{"id":"1908.03587","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1908.03587","created_at":"2026-07-04T23:52:42Z"},{"alias_kind":"arxiv_version","alias_value":"1908.03587v1","created_at":"2026-07-04T23:52:42Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1908.03587","created_at":"2026-07-04T23:52:42Z"},{"alias_kind":"pith_short_12","alias_value":"KPZV5K3KEUQ6","created_at":"2026-07-04T23:52:42Z"},{"alias_kind":"pith_short_16","alias_value":"KPZV5K3KEUQ6LBWC","created_at":"2026-07-04T23:52:42Z"},{"alias_kind":"pith_short_8","alias_value":"KPZV5K3K","created_at":"2026-07-04T23:52:42Z"}],"graph_snapshots":[{"event_id":"sha256:d800a22c99ab0d653f888257af994e38553ef76c07f530f45907846e5c9318f6","target":"graph","created_at":"2026-07-04T23:52:42Z","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/1908.03587/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"Imaging Atmospheric Cherenkov Telescopes have long been viewed as potential light collectors to be used for long baseline optical intensity interferometry observations. Intensity interferometry, as implemented with Cherenkov telescopes, is well suited for studying the spatial structure of stars of O/B/A stellar types at short optical wavelengths. Such observations complement those with the current generation of optical amplitude interferometers, which are typically restricted to longer wavelengths. Dedicated intensity interferometry instrumentation has been developed for the VERITAS observator","authors_text":"N. Matthews (for the VERITAS Collaboration), S. LeBohec","cross_cats":["astro-ph.SR"],"headline":"","license":"http://creativecommons.org/licenses/by-nc-sa/4.0/","primary_cat":"astro-ph.IM","submitted_at":"2019-08-09T18:09:50Z","title":"Astrophysical measurements with the VERITAS Stellar Intensity Interferometer"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1908.03587","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":"sha256:319a5df82935377caf7d59e6795a4434b45e6321ad5ef6203eb7bbfb80b3e9fe","target":"record","created_at":"2026-07-04T23:52:42Z","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":"e556a37dd33ea3fa96c8837612364c7d059bb008974aaba0729cea2a58e9a5d2","cross_cats_sorted":["astro-ph.SR"],"license":"http://creativecommons.org/licenses/by-nc-sa/4.0/","primary_cat":"astro-ph.IM","submitted_at":"2019-08-09T18:09:50Z","title_canon_sha256":"7ff4f109374ab5295233983278b24f80fca397f4335c84803fb48ef87c951e6e"},"schema_version":"1.0","source":{"id":"1908.03587","kind":"arxiv","version":1}},"canonical_sha256":"53f35eab6a2521e586c28814701a2a48171bc14b919a9af22091a6e63afc4c81","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"53f35eab6a2521e586c28814701a2a48171bc14b919a9af22091a6e63afc4c81","first_computed_at":"2026-07-04T23:52:42.255507Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-04T23:52:42.255507Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"dO1xBTNiqyi5Qg3Mo1FL3ecubYml0Jgiev/o/h3agqCfzgbsDr58B2IzEMVHs+P9SyJorB2CI4acLfLlZ34AAA==","signature_status":"signed_v1","signed_at":"2026-07-04T23:52:42.255976Z","signed_message":"canonical_sha256_bytes"},"source_id":"1908.03587","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:319a5df82935377caf7d59e6795a4434b45e6321ad5ef6203eb7bbfb80b3e9fe","sha256:d800a22c99ab0d653f888257af994e38553ef76c07f530f45907846e5c9318f6"],"state_sha256":"14c509b67f8fbfce749a7e0bcec03a4de344633e93c32166ef217eff3334c5e2"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"wTf8BTbA8rnvnEsOnOCKSJ1raxt21ezH3cjKoMxFqzZkqYhxe4PMKBrvZ9gA3EHfM4958ncAL4zLxsCGaGrnDg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-18T10:40:40.510103Z","bundle_sha256":"4a5d546235bd2dcfb832c015f7b2479a7cf5233e8ac6ad5408987c38b630ccdc"}}