{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2019:7DXANC6WGYAQKKLQWEYTAZPH2J","short_pith_number":"pith:7DXANC6W","canonical_record":{"source":{"id":"1908.05785","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2019-08-15T22:29:41Z","cross_cats_sorted":[],"title_canon_sha256":"c0354986661bd1c5918b3049297d4758cc423b97eaaa14f82bce782b6be0ca7b","abstract_canon_sha256":"65d6ec6e02fce2a879d8eb4f9e5b53a6b7d4754a4736a0ef0576653617375910"},"schema_version":"1.0"},"canonical_sha256":"f8ee068bd63601052970b1313065e7d26e70d4b09ddbeeae9c73bfb86d4ca94e","source":{"kind":"arxiv","id":"1908.05785","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1908.05785","created_at":"2026-07-05T00:10:41Z"},{"alias_kind":"arxiv_version","alias_value":"1908.05785v1","created_at":"2026-07-05T00:10:41Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1908.05785","created_at":"2026-07-05T00:10:41Z"},{"alias_kind":"pith_short_12","alias_value":"7DXANC6WGYAQ","created_at":"2026-07-05T00:10:41Z"},{"alias_kind":"pith_short_16","alias_value":"7DXANC6WGYAQKKLQ","created_at":"2026-07-05T00:10:41Z"},{"alias_kind":"pith_short_8","alias_value":"7DXANC6W","created_at":"2026-07-05T00:10:41Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2019:7DXANC6WGYAQKKLQWEYTAZPH2J","target":"record","payload":{"canonical_record":{"source":{"id":"1908.05785","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2019-08-15T22:29:41Z","cross_cats_sorted":[],"title_canon_sha256":"c0354986661bd1c5918b3049297d4758cc423b97eaaa14f82bce782b6be0ca7b","abstract_canon_sha256":"65d6ec6e02fce2a879d8eb4f9e5b53a6b7d4754a4736a0ef0576653617375910"},"schema_version":"1.0"},"canonical_sha256":"f8ee068bd63601052970b1313065e7d26e70d4b09ddbeeae9c73bfb86d4ca94e","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T00:10:41.897380Z","signature_b64":"05GPWLwdV3U/xAeskjUhHWnDC2KJq7fKrgtqGAPNObMX4nX49B4QLraFDpB8/HST6A2pSO0OiV+Ppxj2wBbMDA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"f8ee068bd63601052970b1313065e7d26e70d4b09ddbeeae9c73bfb86d4ca94e","last_reissued_at":"2026-07-05T00:10:41.896957Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T00:10:41.896957Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1908.05785","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":"2026-07-05T00:10:41Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"XZrLwN+ZcvjhxJvU2qed3tFqIcMZr3Tv5twKUa0FSxjBb/qLOtfkbVNlnj8oM/h5XbdLhW6GJAoW0l5znPgfBQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-03T21:47:17.297872Z"},"content_sha256":"1f2b1820c715d3f0604fed519b90e8c9e54a37127a5d2e5a9c8941aed910ea63","schema_version":"1.0","event_id":"sha256:1f2b1820c715d3f0604fed519b90e8c9e54a37127a5d2e5a9c8941aed910ea63"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2019:7DXANC6WGYAQKKLQWEYTAZPH2J","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"OPTICAM: A triple-camera optical system designed to explore the fastest timescales in Astronomy","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.IM","authors_text":"A. Castro, B. Garc\\'ia, C. Knigge, C. Tejada, D. Altamirano, D. Whiter, E. Colorado, G. Guisa, G. Sierra, J. Echevarr\\'ia, J. Hern\\'andez-Landa, J.V. Hern\\'andez Santisteban, M. Middleton, N. Castro-Segura, P. Gandhi, R. Michel","submitted_at":"2019-08-15T22:29:41Z","abstract_excerpt":"We report the development of a high-time resolution, 3-colour, simultaneous optical imaging system for the 2.1 m telescope in San Pedro M\\'artir Observatory, M\\'exico. OPTICAM will be equipped with three Andor Zyla 4.2-Plus sCMOS cameras and a set of SDSS filters allowing optical coverage in the 320-1,100 nm range. OPTICAM will nominally allow sub-second exposures. Given its instrumental design, a wide range of fast-variability astrophysical sources can be targeted with OPTICAM including X-ray binaries, pulsating white dwarfs, accreting compact objects, eclipsing binaries and exoplanets. OPTIC"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1908.05785","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/1908.05785/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":"2026-07-05T00:10:41Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"fvtronaKS+h2wbJo+V0y1tc1dHqmroL0/XpuMFWY0W6kASgqLm/ToeFXHzsUhgny2Mqrc1IGutuOnm5TVQDgBw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-03T21:47:17.298294Z"},"content_sha256":"823cf635ce525017c6d81b7d5ccf7f2fcb9e7c4f076daf938fb0535ea556798d","schema_version":"1.0","event_id":"sha256:823cf635ce525017c6d81b7d5ccf7f2fcb9e7c4f076daf938fb0535ea556798d"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/7DXANC6WGYAQKKLQWEYTAZPH2J/bundle.json","state_url":"https://pith.science/pith/7DXANC6WGYAQKKLQWEYTAZPH2J/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/7DXANC6WGYAQKKLQWEYTAZPH2J/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":"2026-08-03T21:47:17Z","links":{"resolver":"https://pith.science/pith/7DXANC6WGYAQKKLQWEYTAZPH2J","bundle":"https://pith.science/pith/7DXANC6WGYAQKKLQWEYTAZPH2J/bundle.json","state":"https://pith.science/pith/7DXANC6WGYAQKKLQWEYTAZPH2J/state.json","well_known_bundle":"https://pith.science/.well-known/pith/7DXANC6WGYAQKKLQWEYTAZPH2J/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2019:7DXANC6WGYAQKKLQWEYTAZPH2J","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":"65d6ec6e02fce2a879d8eb4f9e5b53a6b7d4754a4736a0ef0576653617375910","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2019-08-15T22:29:41Z","title_canon_sha256":"c0354986661bd1c5918b3049297d4758cc423b97eaaa14f82bce782b6be0ca7b"},"schema_version":"1.0","source":{"id":"1908.05785","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1908.05785","created_at":"2026-07-05T00:10:41Z"},{"alias_kind":"arxiv_version","alias_value":"1908.05785v1","created_at":"2026-07-05T00:10:41Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1908.05785","created_at":"2026-07-05T00:10:41Z"},{"alias_kind":"pith_short_12","alias_value":"7DXANC6WGYAQ","created_at":"2026-07-05T00:10:41Z"},{"alias_kind":"pith_short_16","alias_value":"7DXANC6WGYAQKKLQ","created_at":"2026-07-05T00:10:41Z"},{"alias_kind":"pith_short_8","alias_value":"7DXANC6W","created_at":"2026-07-05T00:10:41Z"}],"graph_snapshots":[{"event_id":"sha256:823cf635ce525017c6d81b7d5ccf7f2fcb9e7c4f076daf938fb0535ea556798d","target":"graph","created_at":"2026-07-05T00:10:41Z","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/1908.05785/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"We report the development of a high-time resolution, 3-colour, simultaneous optical imaging system for the 2.1 m telescope in San Pedro M\\'artir Observatory, M\\'exico. OPTICAM will be equipped with three Andor Zyla 4.2-Plus sCMOS cameras and a set of SDSS filters allowing optical coverage in the 320-1,100 nm range. OPTICAM will nominally allow sub-second exposures. Given its instrumental design, a wide range of fast-variability astrophysical sources can be targeted with OPTICAM including X-ray binaries, pulsating white dwarfs, accreting compact objects, eclipsing binaries and exoplanets. OPTIC","authors_text":"A. Castro, B. Garc\\'ia, C. Knigge, C. Tejada, D. Altamirano, D. Whiter, E. Colorado, G. Guisa, G. Sierra, J. Echevarr\\'ia, J. Hern\\'andez-Landa, J.V. Hern\\'andez Santisteban, M. Middleton, N. Castro-Segura, P. Gandhi, R. Michel","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2019-08-15T22:29:41Z","title":"OPTICAM: A triple-camera optical system designed to explore the fastest timescales in Astronomy"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1908.05785","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":"sha256:1f2b1820c715d3f0604fed519b90e8c9e54a37127a5d2e5a9c8941aed910ea63","target":"record","created_at":"2026-07-05T00:10:41Z","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":"65d6ec6e02fce2a879d8eb4f9e5b53a6b7d4754a4736a0ef0576653617375910","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2019-08-15T22:29:41Z","title_canon_sha256":"c0354986661bd1c5918b3049297d4758cc423b97eaaa14f82bce782b6be0ca7b"},"schema_version":"1.0","source":{"id":"1908.05785","kind":"arxiv","version":1}},"canonical_sha256":"f8ee068bd63601052970b1313065e7d26e70d4b09ddbeeae9c73bfb86d4ca94e","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"f8ee068bd63601052970b1313065e7d26e70d4b09ddbeeae9c73bfb86d4ca94e","first_computed_at":"2026-07-05T00:10:41.896957Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T00:10:41.896957Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"05GPWLwdV3U/xAeskjUhHWnDC2KJq7fKrgtqGAPNObMX4nX49B4QLraFDpB8/HST6A2pSO0OiV+Ppxj2wBbMDA==","signature_status":"signed_v1","signed_at":"2026-07-05T00:10:41.897380Z","signed_message":"canonical_sha256_bytes"},"source_id":"1908.05785","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:1f2b1820c715d3f0604fed519b90e8c9e54a37127a5d2e5a9c8941aed910ea63","sha256:823cf635ce525017c6d81b7d5ccf7f2fcb9e7c4f076daf938fb0535ea556798d"],"state_sha256":"0432137645803c2eb4442c0049a84f698cbc1f9c8b2f4de006834c9aff8db760"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"vxuTFWA4IVE3wpdkefy/8G9yPqZvlaBGTfnDBUFQNCmsddh+fp5iVi9XEBx9Oz0CwBgZqROxNDCS0jFeDUV0Cw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-03T21:47:17.300905Z","bundle_sha256":"7173f0626719233018d7462cc48ffd9c6814fd94a31d9729b13452b795e380a7"}}