{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2015:2IVAPUCOZJL53SPMXEMOGPYUTE","short_pith_number":"pith:2IVAPUCO","canonical_record":{"source":{"id":"1509.03074","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2015-09-10T10:03:22Z","cross_cats_sorted":[],"title_canon_sha256":"807fea6186b9432e06e7f6e00872d477374fefb169628995fa5a5121856387e6","abstract_canon_sha256":"9df1eb8f02cf688544f8838d56bb969556ca92f49089ee3331e96b6a3844fd83"},"schema_version":"1.0"},"canonical_sha256":"d22a07d04eca57ddc9ecb918e33f1499255bf02c191974d120a5eb2ea689b145","source":{"kind":"arxiv","id":"1509.03074","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1509.03074","created_at":"2026-07-04T23:55:02Z"},{"alias_kind":"arxiv_version","alias_value":"1509.03074v1","created_at":"2026-07-04T23:55:02Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1509.03074","created_at":"2026-07-04T23:55:02Z"},{"alias_kind":"pith_short_12","alias_value":"2IVAPUCOZJL5","created_at":"2026-07-04T23:55:02Z"},{"alias_kind":"pith_short_16","alias_value":"2IVAPUCOZJL53SPM","created_at":"2026-07-04T23:55:02Z"},{"alias_kind":"pith_short_8","alias_value":"2IVAPUCO","created_at":"2026-07-04T23:55:02Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2015:2IVAPUCOZJL53SPMXEMOGPYUTE","target":"record","payload":{"canonical_record":{"source":{"id":"1509.03074","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2015-09-10T10:03:22Z","cross_cats_sorted":[],"title_canon_sha256":"807fea6186b9432e06e7f6e00872d477374fefb169628995fa5a5121856387e6","abstract_canon_sha256":"9df1eb8f02cf688544f8838d56bb969556ca92f49089ee3331e96b6a3844fd83"},"schema_version":"1.0"},"canonical_sha256":"d22a07d04eca57ddc9ecb918e33f1499255bf02c191974d120a5eb2ea689b145","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-04T23:55:02.646726Z","signature_b64":"c1Kz6ScwgoJYn4LkVFQR6htZxD9adC8GnQdzp4mEYqos2OwKaOf918Oaogk8+P5dgG0vosrvAoVl3fTmS4tSDA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"d22a07d04eca57ddc9ecb918e33f1499255bf02c191974d120a5eb2ea689b145","last_reissued_at":"2026-07-04T23:55:02.646348Z","signature_status":"signed_v1","first_computed_at":"2026-07-04T23:55:02.646348Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1509.03074","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":"2026-07-04T23:55:02Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"SmgOI5wexZrtIO1C5R89kzOM2SZMDaU7YzHNkI1umvAXXIQ0hyfpRIjEo84ECxGfX9Zqh93uFCCz2tad/xGVDQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-10T03:06:56.418742Z"},"content_sha256":"cfbebcd6d42afaf5fb9d987b5d2b9b354c3a064656cb7386bc44d91ad20cdf5e","schema_version":"1.0","event_id":"sha256:cfbebcd6d42afaf5fb9d987b5d2b9b354c3a064656cb7386bc44d91ad20cdf5e"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2015:2IVAPUCOZJL53SPMXEMOGPYUTE","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"A Medium Sized Schwarzschild-Couder Cherenkov Telescope Mechanical Design Proposed for the Cherenkov Telescope Array","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.IM","authors_text":"A. Okumura, D. Kieda, D. Naumann, D. Nieto, E. Roache, H. Zhao (for the CTA Consortium), J. Rousselle, K. Byrum, M. Errando, P. Kaaret, R. Cameron, R. Mukherjee, R. Northrop, R. Sternberger, S. Criswell, S. Schlenstedt, S. Wakely, T. B. Humensky, V. Guarino, V. Vassiliev, W. Benbow","submitted_at":"2015-09-10T10:03:22Z","abstract_excerpt":"The Cherenkov Telescope Array (CTA) is an international next-generation ground-based gamma-ray observatory. CTA will be implemented as southern and northern hemisphere arrays of tens of small, medium and large-sized imaging Cherenkov telescopes with the goal of improving the sensitivity over the current-generation experiments by an order of magnitude. CTA will provide energy coverage from ~20 GeV to more than 300 TeV. The Schwarzschild-Couder (SC) medium size (9.5m) telescopes will feature a novel aplanatic two-mirror optical design capable of accommodating a wide field-of-view with significan"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1509.03074","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/1509.03074/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":"2026-07-04T23:55:02Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"LMOSo0bIPoioFRWzZ/2IDiEw1dWCFREv0oMkuIu0IaAvpKYHgYcD5T5vlQkcNpjCU7Qs+uFAoJ31Jd5NiZDBAw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-10T03:06:56.419264Z"},"content_sha256":"5347a9e7e6df420a5afda23305fe9106d69109df8eab566e76c1d0c4adcee54a","schema_version":"1.0","event_id":"sha256:5347a9e7e6df420a5afda23305fe9106d69109df8eab566e76c1d0c4adcee54a"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/2IVAPUCOZJL53SPMXEMOGPYUTE/bundle.json","state_url":"https://pith.science/pith/2IVAPUCOZJL53SPMXEMOGPYUTE/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/2IVAPUCOZJL53SPMXEMOGPYUTE/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":"2026-08-10T03:06:56Z","links":{"resolver":"https://pith.science/pith/2IVAPUCOZJL53SPMXEMOGPYUTE","bundle":"https://pith.science/pith/2IVAPUCOZJL53SPMXEMOGPYUTE/bundle.json","state":"https://pith.science/pith/2IVAPUCOZJL53SPMXEMOGPYUTE/state.json","well_known_bundle":"https://pith.science/.well-known/pith/2IVAPUCOZJL53SPMXEMOGPYUTE/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2015:2IVAPUCOZJL53SPMXEMOGPYUTE","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":"9df1eb8f02cf688544f8838d56bb969556ca92f49089ee3331e96b6a3844fd83","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2015-09-10T10:03:22Z","title_canon_sha256":"807fea6186b9432e06e7f6e00872d477374fefb169628995fa5a5121856387e6"},"schema_version":"1.0","source":{"id":"1509.03074","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1509.03074","created_at":"2026-07-04T23:55:02Z"},{"alias_kind":"arxiv_version","alias_value":"1509.03074v1","created_at":"2026-07-04T23:55:02Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1509.03074","created_at":"2026-07-04T23:55:02Z"},{"alias_kind":"pith_short_12","alias_value":"2IVAPUCOZJL5","created_at":"2026-07-04T23:55:02Z"},{"alias_kind":"pith_short_16","alias_value":"2IVAPUCOZJL53SPM","created_at":"2026-07-04T23:55:02Z"},{"alias_kind":"pith_short_8","alias_value":"2IVAPUCO","created_at":"2026-07-04T23:55:02Z"}],"graph_snapshots":[{"event_id":"sha256:5347a9e7e6df420a5afda23305fe9106d69109df8eab566e76c1d0c4adcee54a","target":"graph","created_at":"2026-07-04T23:55:02Z","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/1509.03074/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"The Cherenkov Telescope Array (CTA) is an international next-generation ground-based gamma-ray observatory. CTA will be implemented as southern and northern hemisphere arrays of tens of small, medium and large-sized imaging Cherenkov telescopes with the goal of improving the sensitivity over the current-generation experiments by an order of magnitude. CTA will provide energy coverage from ~20 GeV to more than 300 TeV. The Schwarzschild-Couder (SC) medium size (9.5m) telescopes will feature a novel aplanatic two-mirror optical design capable of accommodating a wide field-of-view with significan","authors_text":"A. Okumura, D. Kieda, D. Naumann, D. Nieto, E. Roache, H. Zhao (for the CTA Consortium), J. Rousselle, K. Byrum, M. Errando, P. Kaaret, R. Cameron, R. Mukherjee, R. Northrop, R. Sternberger, S. Criswell, S. Schlenstedt, S. Wakely, T. B. Humensky, V. Guarino, V. Vassiliev, W. Benbow","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2015-09-10T10:03:22Z","title":"A Medium Sized Schwarzschild-Couder Cherenkov Telescope Mechanical Design Proposed for the Cherenkov Telescope Array"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1509.03074","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:cfbebcd6d42afaf5fb9d987b5d2b9b354c3a064656cb7386bc44d91ad20cdf5e","target":"record","created_at":"2026-07-04T23:55:02Z","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":"9df1eb8f02cf688544f8838d56bb969556ca92f49089ee3331e96b6a3844fd83","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2015-09-10T10:03:22Z","title_canon_sha256":"807fea6186b9432e06e7f6e00872d477374fefb169628995fa5a5121856387e6"},"schema_version":"1.0","source":{"id":"1509.03074","kind":"arxiv","version":1}},"canonical_sha256":"d22a07d04eca57ddc9ecb918e33f1499255bf02c191974d120a5eb2ea689b145","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"d22a07d04eca57ddc9ecb918e33f1499255bf02c191974d120a5eb2ea689b145","first_computed_at":"2026-07-04T23:55:02.646348Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-04T23:55:02.646348Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"c1Kz6ScwgoJYn4LkVFQR6htZxD9adC8GnQdzp4mEYqos2OwKaOf918Oaogk8+P5dgG0vosrvAoVl3fTmS4tSDA==","signature_status":"signed_v1","signed_at":"2026-07-04T23:55:02.646726Z","signed_message":"canonical_sha256_bytes"},"source_id":"1509.03074","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:cfbebcd6d42afaf5fb9d987b5d2b9b354c3a064656cb7386bc44d91ad20cdf5e","sha256:5347a9e7e6df420a5afda23305fe9106d69109df8eab566e76c1d0c4adcee54a"],"state_sha256":"17e9c6fec76987eb7815e6296b9dfa8ddf1eeb234f2e72a2127b989f68696544"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"k/05Q/hTwz3fbepHJi19u6uYli9KamR8ECk1x9kKQiahLTj5e/bM7oCDaLmgqJWJ0aPaGrGNMUuzBY5R4wVLBw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-10T03:06:56.424082Z","bundle_sha256":"ba2e2df4f80a972cf86616f018380f61d175a65fcb6f94862179f46b849638b3"}}