{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2019:LBXZI36ZZNGXRBFQQ7MZTT6BOW","short_pith_number":"pith:LBXZI36Z","canonical_record":{"source":{"id":"1907.08455","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2019-07-19T10:52:11Z","cross_cats_sorted":["astro-ph.HE"],"title_canon_sha256":"46e8cc1e04c2a034deaba949f9253d5a712950a45ae773ab2a34e0d88bd30d63","abstract_canon_sha256":"2b1592a408e45ac4bfc7d3e73414c5b11c44c9e69b4c21f235b1840b8f08b633"},"schema_version":"1.0"},"canonical_sha256":"586f946fd9cb4d7884b087d999cfc175ab101cf948cb3795f0d6700bd94b5d3d","source":{"kind":"arxiv","id":"1907.08455","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1907.08455","created_at":"2026-05-17T23:40:09Z"},{"alias_kind":"arxiv_version","alias_value":"1907.08455v1","created_at":"2026-05-17T23:40:09Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1907.08455","created_at":"2026-05-17T23:40:09Z"},{"alias_kind":"pith_short_12","alias_value":"LBXZI36ZZNGX","created_at":"2026-05-18T12:33:21Z"},{"alias_kind":"pith_short_16","alias_value":"LBXZI36ZZNGXRBFQ","created_at":"2026-05-18T12:33:21Z"},{"alias_kind":"pith_short_8","alias_value":"LBXZI36Z","created_at":"2026-05-18T12:33:21Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2019:LBXZI36ZZNGXRBFQQ7MZTT6BOW","target":"record","payload":{"canonical_record":{"source":{"id":"1907.08455","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2019-07-19T10:52:11Z","cross_cats_sorted":["astro-ph.HE"],"title_canon_sha256":"46e8cc1e04c2a034deaba949f9253d5a712950a45ae773ab2a34e0d88bd30d63","abstract_canon_sha256":"2b1592a408e45ac4bfc7d3e73414c5b11c44c9e69b4c21f235b1840b8f08b633"},"schema_version":"1.0"},"canonical_sha256":"586f946fd9cb4d7884b087d999cfc175ab101cf948cb3795f0d6700bd94b5d3d","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-17T23:40:09.783115Z","signature_b64":"7R661tIvpJbNS9CQzL//orVrVDMFHDgTApDg8f6CB5qotSa6iFYL8rg/qMTffpneP31wVpx5WmzHg7nDCK4iAg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"586f946fd9cb4d7884b087d999cfc175ab101cf948cb3795f0d6700bd94b5d3d","last_reissued_at":"2026-05-17T23:40:09.782241Z","signature_status":"signed_v1","first_computed_at":"2026-05-17T23:40:09.782241Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1907.08455","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":"2026-05-17T23:40:09Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"QfrMVlzEsB21q9fi7bWrNZ6Koyci2ULVjncQOjAlylw1D9hpGu7IZTf4OqN5A33I0hwC4KCzg2mChqD6mvDcAw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-28T10:34:41.281065Z"},"content_sha256":"242c2b378236d2d9933fac981127647561a73d8f4df68d3306643fd00c8fb614","schema_version":"1.0","event_id":"sha256:242c2b378236d2d9933fac981127647561a73d8f4df68d3306643fd00c8fb614"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2019:LBXZI36ZZNGXRBFQQ7MZTT6BOW","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Status of the Davies-Cotton and Schwarzschild-Couder Medium-Sized Telescopes for the Cherenkov Telescope Array","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.HE"],"primary_cat":"astro-ph.IM","authors_text":"CTA SCT Projects), J-F. Glicenstein (for the CTA MST","submitted_at":"2019-07-19T10:52:11Z","abstract_excerpt":"The Cherenkov Telescope Array is an observatory dedicated to very high energy gamma rays with unprecedented sensitivity between 20 GeV and 300 TeV to be installed on two sites: Canary Island La Palma and Paranal Chile. Three telescope sizes will be used to cover the entire energy range. Two different telescope designs have been proposed to cover the intermediate energy range from 150 GeV to 5 TeV. One of the proposals is based on the traditional single mirror Davies-Cotton design, with two different camera concepts with different detection and processing schemes are under test. Another innovat"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1907.08455","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":"2026-05-17T23:40:09Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"DON1kcZXLuBmkWDdW2EnrCrUN1gaW3oJdNLOPI5n0UXxQvF/LYi36/uMQRzt8Xx/Fh/G2zmW95krvSqAeyb0BA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-28T10:34:41.281416Z"},"content_sha256":"db4c94dee4e4a635cf9fc56c0772524c47fd0d6608bbee37a1809bdb5fb06522","schema_version":"1.0","event_id":"sha256:db4c94dee4e4a635cf9fc56c0772524c47fd0d6608bbee37a1809bdb5fb06522"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/LBXZI36ZZNGXRBFQQ7MZTT6BOW/bundle.json","state_url":"https://pith.science/pith/LBXZI36ZZNGXRBFQQ7MZTT6BOW/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/LBXZI36ZZNGXRBFQQ7MZTT6BOW/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":"2026-06-28T10:34:41Z","links":{"resolver":"https://pith.science/pith/LBXZI36ZZNGXRBFQQ7MZTT6BOW","bundle":"https://pith.science/pith/LBXZI36ZZNGXRBFQQ7MZTT6BOW/bundle.json","state":"https://pith.science/pith/LBXZI36ZZNGXRBFQQ7MZTT6BOW/state.json","well_known_bundle":"https://pith.science/.well-known/pith/LBXZI36ZZNGXRBFQQ7MZTT6BOW/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2019:LBXZI36ZZNGXRBFQQ7MZTT6BOW","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":"2b1592a408e45ac4bfc7d3e73414c5b11c44c9e69b4c21f235b1840b8f08b633","cross_cats_sorted":["astro-ph.HE"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2019-07-19T10:52:11Z","title_canon_sha256":"46e8cc1e04c2a034deaba949f9253d5a712950a45ae773ab2a34e0d88bd30d63"},"schema_version":"1.0","source":{"id":"1907.08455","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1907.08455","created_at":"2026-05-17T23:40:09Z"},{"alias_kind":"arxiv_version","alias_value":"1907.08455v1","created_at":"2026-05-17T23:40:09Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1907.08455","created_at":"2026-05-17T23:40:09Z"},{"alias_kind":"pith_short_12","alias_value":"LBXZI36ZZNGX","created_at":"2026-05-18T12:33:21Z"},{"alias_kind":"pith_short_16","alias_value":"LBXZI36ZZNGXRBFQ","created_at":"2026-05-18T12:33:21Z"},{"alias_kind":"pith_short_8","alias_value":"LBXZI36Z","created_at":"2026-05-18T12:33:21Z"}],"graph_snapshots":[{"event_id":"sha256:db4c94dee4e4a635cf9fc56c0772524c47fd0d6608bbee37a1809bdb5fb06522","target":"graph","created_at":"2026-05-17T23:40:09Z","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":"The Cherenkov Telescope Array is an observatory dedicated to very high energy gamma rays with unprecedented sensitivity between 20 GeV and 300 TeV to be installed on two sites: Canary Island La Palma and Paranal Chile. Three telescope sizes will be used to cover the entire energy range. Two different telescope designs have been proposed to cover the intermediate energy range from 150 GeV to 5 TeV. One of the proposals is based on the traditional single mirror Davies-Cotton design, with two different camera concepts with different detection and processing schemes are under test. Another innovat","authors_text":"CTA SCT Projects), J-F. Glicenstein (for the CTA MST","cross_cats":["astro-ph.HE"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2019-07-19T10:52:11Z","title":"Status of the Davies-Cotton and Schwarzschild-Couder Medium-Sized Telescopes for the Cherenkov Telescope Array"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1907.08455","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":"sha256:242c2b378236d2d9933fac981127647561a73d8f4df68d3306643fd00c8fb614","target":"record","created_at":"2026-05-17T23:40:09Z","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":"2b1592a408e45ac4bfc7d3e73414c5b11c44c9e69b4c21f235b1840b8f08b633","cross_cats_sorted":["astro-ph.HE"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2019-07-19T10:52:11Z","title_canon_sha256":"46e8cc1e04c2a034deaba949f9253d5a712950a45ae773ab2a34e0d88bd30d63"},"schema_version":"1.0","source":{"id":"1907.08455","kind":"arxiv","version":1}},"canonical_sha256":"586f946fd9cb4d7884b087d999cfc175ab101cf948cb3795f0d6700bd94b5d3d","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"586f946fd9cb4d7884b087d999cfc175ab101cf948cb3795f0d6700bd94b5d3d","first_computed_at":"2026-05-17T23:40:09.782241Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-17T23:40:09.782241Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"7R661tIvpJbNS9CQzL//orVrVDMFHDgTApDg8f6CB5qotSa6iFYL8rg/qMTffpneP31wVpx5WmzHg7nDCK4iAg==","signature_status":"signed_v1","signed_at":"2026-05-17T23:40:09.783115Z","signed_message":"canonical_sha256_bytes"},"source_id":"1907.08455","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:242c2b378236d2d9933fac981127647561a73d8f4df68d3306643fd00c8fb614","sha256:db4c94dee4e4a635cf9fc56c0772524c47fd0d6608bbee37a1809bdb5fb06522"],"state_sha256":"ce277250bd09cc9f3285f62f52a0490d06a3eed9ba850c75c630b5de10279f40"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"Mk0LOSYbJfjDnuwIweVBVnsKcszW0vsOoio0OQrKjjQaLoR6ATLGuq71nfT9/FK/GIH6b3TTWlcyS0GPqmCZBA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-28T10:34:41.283218Z","bundle_sha256":"8726c8863b8ae5553f58c119b2361c89731a0de19022854f0f7a5cdf61f244b6"}}