{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2016:73UNSZ4YVCCH667VCGISZ2KB4T","short_pith_number":"pith:73UNSZ4Y","canonical_record":{"source":{"id":"1608.01804","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2016-08-05T08:44:13Z","cross_cats_sorted":[],"title_canon_sha256":"15bf0c0e13350aa5e1a4c1e3d1be8e8b73595e2b508a3ae6d3c6faeb81007291","abstract_canon_sha256":"d68b7ad2cd686d01b44285e3ad945c21448146073c5dd2b98c137293581afaf0"},"schema_version":"1.0"},"canonical_sha256":"fee8d96798a8847f7bf511912ce941e4ea9b5f3064e8131e5069ff3c96b99838","source":{"kind":"arxiv","id":"1608.01804","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1608.01804","created_at":"2026-05-18T00:57:26Z"},{"alias_kind":"arxiv_version","alias_value":"1608.01804v1","created_at":"2026-05-18T00:57:26Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1608.01804","created_at":"2026-05-18T00:57:26Z"},{"alias_kind":"pith_short_12","alias_value":"73UNSZ4YVCCH","created_at":"2026-05-18T12:30:04Z"},{"alias_kind":"pith_short_16","alias_value":"73UNSZ4YVCCH667V","created_at":"2026-05-18T12:30:04Z"},{"alias_kind":"pith_short_8","alias_value":"73UNSZ4Y","created_at":"2026-05-18T12:30:04Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2016:73UNSZ4YVCCH667VCGISZ2KB4T","target":"record","payload":{"canonical_record":{"source":{"id":"1608.01804","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2016-08-05T08:44:13Z","cross_cats_sorted":[],"title_canon_sha256":"15bf0c0e13350aa5e1a4c1e3d1be8e8b73595e2b508a3ae6d3c6faeb81007291","abstract_canon_sha256":"d68b7ad2cd686d01b44285e3ad945c21448146073c5dd2b98c137293581afaf0"},"schema_version":"1.0"},"canonical_sha256":"fee8d96798a8847f7bf511912ce941e4ea9b5f3064e8131e5069ff3c96b99838","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T00:57:26.574017Z","signature_b64":"sgRmJEKHN9BHAVgVfipBqTQsR7QSBSEoihmWJ7vCmZusWkVqSoI4gSkiNEE+7HcI2hq6mfEQctNoWAfBp0RPAw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"fee8d96798a8847f7bf511912ce941e4ea9b5f3064e8131e5069ff3c96b99838","last_reissued_at":"2026-05-18T00:57:26.573470Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T00:57:26.573470Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1608.01804","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":"2026-05-18T00:57:26Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"cXDVJQat/oxdgCGYkZdgCdPptQqBcuiCw6FctV5lb1L75hEfqnh5K7CKLlcHjs8T9ILFsPBI739qnCsQtiX7DQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-26T18:50:31.394427Z"},"content_sha256":"a3af3851740e5d7de376752ca17078f06f2d1de693ce3d9b054a3cd2af7a2d77","schema_version":"1.0","event_id":"sha256:a3af3851740e5d7de376752ca17078f06f2d1de693ce3d9b054a3cd2af7a2d77"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2016:73UNSZ4YVCCH667VCGISZ2KB4T","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"`imaka - a ground-layer adaptive optics system on Maunakea","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.IM","authors_text":"Brad Steele, Christoph Baranec, Christopher Kingery, Denis Brousseau, Douglas Toomey, Jessica Lu, John Gardiner, Keith Loss, Mark Chun, Max Service, Olivier Lai, Shane Santi, Shin Oya, Simon Thibault, Yutaka Hayano","submitted_at":"2016-08-05T08:44:13Z","abstract_excerpt":"We present the integration status for `imaka, the ground-layer adaptive optics (GLAO) system on the University of Hawaii 2.2-meter telescope on Maunakea, Hawaii. This wide-field GLAO pathfinder system exploits Maunakea's highly confined ground layer and weak free-atmosphere to push the corrected field of view to ~1/3 of a degree, an areal field approaching an order of magnitude larger than any existing or planned GLAO system, with a FWHM ~ 0.33 arcseconds in the visible and near infrared. We discuss the unique design aspects of the instrument, the driving science cases and how they impact the "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1608.01804","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":"2026-05-18T00:57:26Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"lG2waFe+ZyajHWtdZWkAsMEObzDfHURP2qDrpbeztwn3HB5OPL++R4U78TW0cFNj9PLx69HZEa13L3r5CsR5Dw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-26T18:50:31.395033Z"},"content_sha256":"857cbbf7c7a86bad85085bb9f3c1fcec0c620ce4e6fef9364b9969b10fa9eeac","schema_version":"1.0","event_id":"sha256:857cbbf7c7a86bad85085bb9f3c1fcec0c620ce4e6fef9364b9969b10fa9eeac"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/73UNSZ4YVCCH667VCGISZ2KB4T/bundle.json","state_url":"https://pith.science/pith/73UNSZ4YVCCH667VCGISZ2KB4T/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/73UNSZ4YVCCH667VCGISZ2KB4T/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":"2026-05-26T18:50:31Z","links":{"resolver":"https://pith.science/pith/73UNSZ4YVCCH667VCGISZ2KB4T","bundle":"https://pith.science/pith/73UNSZ4YVCCH667VCGISZ2KB4T/bundle.json","state":"https://pith.science/pith/73UNSZ4YVCCH667VCGISZ2KB4T/state.json","well_known_bundle":"https://pith.science/.well-known/pith/73UNSZ4YVCCH667VCGISZ2KB4T/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2016:73UNSZ4YVCCH667VCGISZ2KB4T","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":"d68b7ad2cd686d01b44285e3ad945c21448146073c5dd2b98c137293581afaf0","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2016-08-05T08:44:13Z","title_canon_sha256":"15bf0c0e13350aa5e1a4c1e3d1be8e8b73595e2b508a3ae6d3c6faeb81007291"},"schema_version":"1.0","source":{"id":"1608.01804","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1608.01804","created_at":"2026-05-18T00:57:26Z"},{"alias_kind":"arxiv_version","alias_value":"1608.01804v1","created_at":"2026-05-18T00:57:26Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1608.01804","created_at":"2026-05-18T00:57:26Z"},{"alias_kind":"pith_short_12","alias_value":"73UNSZ4YVCCH","created_at":"2026-05-18T12:30:04Z"},{"alias_kind":"pith_short_16","alias_value":"73UNSZ4YVCCH667V","created_at":"2026-05-18T12:30:04Z"},{"alias_kind":"pith_short_8","alias_value":"73UNSZ4Y","created_at":"2026-05-18T12:30:04Z"}],"graph_snapshots":[{"event_id":"sha256:857cbbf7c7a86bad85085bb9f3c1fcec0c620ce4e6fef9364b9969b10fa9eeac","target":"graph","created_at":"2026-05-18T00:57:26Z","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":"We present the integration status for `imaka, the ground-layer adaptive optics (GLAO) system on the University of Hawaii 2.2-meter telescope on Maunakea, Hawaii. This wide-field GLAO pathfinder system exploits Maunakea's highly confined ground layer and weak free-atmosphere to push the corrected field of view to ~1/3 of a degree, an areal field approaching an order of magnitude larger than any existing or planned GLAO system, with a FWHM ~ 0.33 arcseconds in the visible and near infrared. We discuss the unique design aspects of the instrument, the driving science cases and how they impact the ","authors_text":"Brad Steele, Christoph Baranec, Christopher Kingery, Denis Brousseau, Douglas Toomey, Jessica Lu, John Gardiner, Keith Loss, Mark Chun, Max Service, Olivier Lai, Shane Santi, Shin Oya, Simon Thibault, Yutaka Hayano","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2016-08-05T08:44:13Z","title":"`imaka - a ground-layer adaptive optics system on Maunakea"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1608.01804","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:a3af3851740e5d7de376752ca17078f06f2d1de693ce3d9b054a3cd2af7a2d77","target":"record","created_at":"2026-05-18T00:57:26Z","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":"d68b7ad2cd686d01b44285e3ad945c21448146073c5dd2b98c137293581afaf0","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2016-08-05T08:44:13Z","title_canon_sha256":"15bf0c0e13350aa5e1a4c1e3d1be8e8b73595e2b508a3ae6d3c6faeb81007291"},"schema_version":"1.0","source":{"id":"1608.01804","kind":"arxiv","version":1}},"canonical_sha256":"fee8d96798a8847f7bf511912ce941e4ea9b5f3064e8131e5069ff3c96b99838","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"fee8d96798a8847f7bf511912ce941e4ea9b5f3064e8131e5069ff3c96b99838","first_computed_at":"2026-05-18T00:57:26.573470Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:57:26.573470Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"sgRmJEKHN9BHAVgVfipBqTQsR7QSBSEoihmWJ7vCmZusWkVqSoI4gSkiNEE+7HcI2hq6mfEQctNoWAfBp0RPAw==","signature_status":"signed_v1","signed_at":"2026-05-18T00:57:26.574017Z","signed_message":"canonical_sha256_bytes"},"source_id":"1608.01804","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:a3af3851740e5d7de376752ca17078f06f2d1de693ce3d9b054a3cd2af7a2d77","sha256:857cbbf7c7a86bad85085bb9f3c1fcec0c620ce4e6fef9364b9969b10fa9eeac"],"state_sha256":"47aff47660c6b9ec62d34821b0139922ccc1802d1ee8c3197ff7321402c4ffdf"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"o6iVxbVYw92VgqkNLuZIV5IcfrB8l6QwokUpLySs8myICMsgMTHC5l+YFblO61KAIlzdzvYX41VCAWfsdLOSBw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-26T18:50:31.397926Z","bundle_sha256":"39a47131e3915f05c82842cd7c75f23cf7c767b1713fbf5db9e893958173be0f"}}