{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2026:AL7SGTTAELAJP4BKDNPCD73X2G","short_pith_number":"pith:AL7SGTTA","canonical_record":{"source":{"id":"2608.09237","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2026-08-10T08:02:48Z","cross_cats_sorted":[],"title_canon_sha256":"02a9cb57918883ffb6e000506bea55ecb1428bc042149248be470547f6e8ff5d","abstract_canon_sha256":"1e85d22552f3310825c692ac0c35ad61ec11b158ee72a84eeda33a37ebc1fd4d"},"schema_version":"1.0"},"canonical_sha256":"02ff234e6022c097f02a1b5e21ff77d19b77cdd65f28cdfb2d045d0e4d18219d","source":{"kind":"arxiv","id":"2608.09237","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2608.09237","created_at":"2026-08-11T02:22:08Z"},{"alias_kind":"arxiv_version","alias_value":"2608.09237v1","created_at":"2026-08-11T02:22:08Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2608.09237","created_at":"2026-08-11T02:22:08Z"},{"alias_kind":"pith_short_12","alias_value":"AL7SGTTAELAJ","created_at":"2026-08-11T02:22:08Z"},{"alias_kind":"pith_short_16","alias_value":"AL7SGTTAELAJP4BK","created_at":"2026-08-11T02:22:08Z"},{"alias_kind":"pith_short_8","alias_value":"AL7SGTTA","created_at":"2026-08-11T02:22:08Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2026:AL7SGTTAELAJP4BKDNPCD73X2G","target":"record","payload":{"canonical_record":{"source":{"id":"2608.09237","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2026-08-10T08:02:48Z","cross_cats_sorted":[],"title_canon_sha256":"02a9cb57918883ffb6e000506bea55ecb1428bc042149248be470547f6e8ff5d","abstract_canon_sha256":"1e85d22552f3310825c692ac0c35ad61ec11b158ee72a84eeda33a37ebc1fd4d"},"schema_version":"1.0"},"canonical_sha256":"02ff234e6022c097f02a1b5e21ff77d19b77cdd65f28cdfb2d045d0e4d18219d","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-08-11T02:22:08.878462Z","signature_b64":"JRebNb4bF5YZ3D59zciWJCqEJITNNE3gSqk/ggGs+7PkJklsUpnimOtDtrxUG00rKnwGRuK/yBTqfyUii368Bw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"02ff234e6022c097f02a1b5e21ff77d19b77cdd65f28cdfb2d045d0e4d18219d","last_reissued_at":"2026-08-11T02:22:08.876698Z","signature_status":"signed_v1","first_computed_at":"2026-08-11T02:22:08.876698Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2608.09237","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":"2026-08-11T02:22:08Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"bjtb8e+/ASiAFz35OcOv5sO3ox1G3Csu5u0f6adMNv2+T2EhML4JxhqkJ+bWV/1/kjxfsv/d/c5AAKjGgaeyBg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-20T20:23:38.178184Z"},"content_sha256":"d16e207bb04f5e23e662efb2567dbafa1dcb8bea4f0dcc92c1ed887a2c018678","schema_version":"1.0","event_id":"sha256:d16e207bb04f5e23e662efb2567dbafa1dcb8bea4f0dcc92c1ed887a2c018678"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2026:AL7SGTTAELAJP4BKDNPCD73X2G","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Optimizing Wavefront-Deformation Sensor Placement for Active Radio-Telescope Surfaces","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.IM","authors_text":"Martin Timpe, Matthias Reichert, Stefan Thoms","submitted_at":"2026-08-10T08:02:48Z","abstract_excerpt":"Next-generation high-frequency radio telescopes require primary-surface accuracies that passive structures alone cannot reliably achieve. The Atacama Large Aperture Submillimeter Telescope (AtLAST), a 50 m single-dish concept operating up to $\\approx$ 1 THz, imposes a $\\approx$ 20 $\\mu$m rms surface-accuracy requirement across its full aperture. This is practically unattainable for a purely passive reflector subject to gravitational, thermal, and wind-induced deformation. Closed-loop active collimation and surface control are therefore imperative, which in turn requires the deformation field t"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2608.09237","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/2608.09237/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":"2026-08-11T02:22:08Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"OYNwcEXlXafAM6LWLDBckPWxrLNBEQLy5R1+GqR3FxVIbesUWDoD29PBPZ9GlDweX3Uhpzofv6sQseevX1yRBA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-20T20:23:38.178703Z"},"content_sha256":"05a4053448e1a7dae414a84c9591478c8bdc9f327fc7a6568b1baff9b3413fa8","schema_version":"1.0","event_id":"sha256:05a4053448e1a7dae414a84c9591478c8bdc9f327fc7a6568b1baff9b3413fa8"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/AL7SGTTAELAJP4BKDNPCD73X2G/bundle.json","state_url":"https://pith.science/pith/AL7SGTTAELAJP4BKDNPCD73X2G/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/AL7SGTTAELAJP4BKDNPCD73X2G/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":"2026-08-20T20:23:38Z","links":{"resolver":"https://pith.science/pith/AL7SGTTAELAJP4BKDNPCD73X2G","bundle":"https://pith.science/pith/AL7SGTTAELAJP4BKDNPCD73X2G/bundle.json","state":"https://pith.science/pith/AL7SGTTAELAJP4BKDNPCD73X2G/state.json","well_known_bundle":"https://pith.science/.well-known/pith/AL7SGTTAELAJP4BKDNPCD73X2G/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2026:AL7SGTTAELAJP4BKDNPCD73X2G","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":"1e85d22552f3310825c692ac0c35ad61ec11b158ee72a84eeda33a37ebc1fd4d","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2026-08-10T08:02:48Z","title_canon_sha256":"02a9cb57918883ffb6e000506bea55ecb1428bc042149248be470547f6e8ff5d"},"schema_version":"1.0","source":{"id":"2608.09237","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2608.09237","created_at":"2026-08-11T02:22:08Z"},{"alias_kind":"arxiv_version","alias_value":"2608.09237v1","created_at":"2026-08-11T02:22:08Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2608.09237","created_at":"2026-08-11T02:22:08Z"},{"alias_kind":"pith_short_12","alias_value":"AL7SGTTAELAJ","created_at":"2026-08-11T02:22:08Z"},{"alias_kind":"pith_short_16","alias_value":"AL7SGTTAELAJP4BK","created_at":"2026-08-11T02:22:08Z"},{"alias_kind":"pith_short_8","alias_value":"AL7SGTTA","created_at":"2026-08-11T02:22:08Z"}],"graph_snapshots":[{"event_id":"sha256:05a4053448e1a7dae414a84c9591478c8bdc9f327fc7a6568b1baff9b3413fa8","target":"graph","created_at":"2026-08-11T02:22:08Z","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/2608.09237/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"Next-generation high-frequency radio telescopes require primary-surface accuracies that passive structures alone cannot reliably achieve. The Atacama Large Aperture Submillimeter Telescope (AtLAST), a 50 m single-dish concept operating up to $\\approx$ 1 THz, imposes a $\\approx$ 20 $\\mu$m rms surface-accuracy requirement across its full aperture. This is practically unattainable for a purely passive reflector subject to gravitational, thermal, and wind-induced deformation. Closed-loop active collimation and surface control are therefore imperative, which in turn requires the deformation field t","authors_text":"Martin Timpe, Matthias Reichert, Stefan Thoms","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2026-08-10T08:02:48Z","title":"Optimizing Wavefront-Deformation Sensor Placement for Active Radio-Telescope Surfaces"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2608.09237","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:d16e207bb04f5e23e662efb2567dbafa1dcb8bea4f0dcc92c1ed887a2c018678","target":"record","created_at":"2026-08-11T02:22:08Z","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":"1e85d22552f3310825c692ac0c35ad61ec11b158ee72a84eeda33a37ebc1fd4d","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2026-08-10T08:02:48Z","title_canon_sha256":"02a9cb57918883ffb6e000506bea55ecb1428bc042149248be470547f6e8ff5d"},"schema_version":"1.0","source":{"id":"2608.09237","kind":"arxiv","version":1}},"canonical_sha256":"02ff234e6022c097f02a1b5e21ff77d19b77cdd65f28cdfb2d045d0e4d18219d","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"02ff234e6022c097f02a1b5e21ff77d19b77cdd65f28cdfb2d045d0e4d18219d","first_computed_at":"2026-08-11T02:22:08.876698Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-08-11T02:22:08.876698Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"JRebNb4bF5YZ3D59zciWJCqEJITNNE3gSqk/ggGs+7PkJklsUpnimOtDtrxUG00rKnwGRuK/yBTqfyUii368Bw==","signature_status":"signed_v1","signed_at":"2026-08-11T02:22:08.878462Z","signed_message":"canonical_sha256_bytes"},"source_id":"2608.09237","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:d16e207bb04f5e23e662efb2567dbafa1dcb8bea4f0dcc92c1ed887a2c018678","sha256:05a4053448e1a7dae414a84c9591478c8bdc9f327fc7a6568b1baff9b3413fa8"],"state_sha256":"81e26639f74dd95b5e853aa696886f55cfb4e05247787ecd806e6e12fe21998e"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"/qH25yF7TipZs77GjHJ1K1aZ4RLd/xuyno2wyCLhV/GdFIsFpv6WiVwAnc1YoESr8rhYSqmV2eYg4+N80Wj/Cw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-20T20:23:38.183697Z","bundle_sha256":"5092f3b39f00bdc529ea28d106f9b5b251e333c9e38a5dc9459977744b2e1501"}}