{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2022:EVQKCE6NRTPA5FD76WGQ3VUXW4","short_pith_number":"pith:EVQKCE6N","canonical_record":{"source":{"id":"2208.09209","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2022-08-19T08:19:13Z","cross_cats_sorted":[],"title_canon_sha256":"5663928bacc16861eebaa975877da75084179ca4f0aef446942d99f7a6b6ca38","abstract_canon_sha256":"c061fdfb93402e8d91b36e2b070b64880e741faff1c10b383977db28d307745a"},"schema_version":"1.0"},"canonical_sha256":"2560a113cd8cde0e947ff58d0dd697b7270e495f0bdc86b72454658eed9e535b","source":{"kind":"arxiv","id":"2208.09209","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2208.09209","created_at":"2026-07-05T06:09:44Z"},{"alias_kind":"arxiv_version","alias_value":"2208.09209v1","created_at":"2026-07-05T06:09:44Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2208.09209","created_at":"2026-07-05T06:09:44Z"},{"alias_kind":"pith_short_12","alias_value":"EVQKCE6NRTPA","created_at":"2026-07-05T06:09:44Z"},{"alias_kind":"pith_short_16","alias_value":"EVQKCE6NRTPA5FD7","created_at":"2026-07-05T06:09:44Z"},{"alias_kind":"pith_short_8","alias_value":"EVQKCE6N","created_at":"2026-07-05T06:09:44Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2022:EVQKCE6NRTPA5FD76WGQ3VUXW4","target":"record","payload":{"canonical_record":{"source":{"id":"2208.09209","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2022-08-19T08:19:13Z","cross_cats_sorted":[],"title_canon_sha256":"5663928bacc16861eebaa975877da75084179ca4f0aef446942d99f7a6b6ca38","abstract_canon_sha256":"c061fdfb93402e8d91b36e2b070b64880e741faff1c10b383977db28d307745a"},"schema_version":"1.0"},"canonical_sha256":"2560a113cd8cde0e947ff58d0dd697b7270e495f0bdc86b72454658eed9e535b","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T06:09:44.363656Z","signature_b64":"I95002yc4M/xDbdyQe48fDWwvq/h/uAXNhLIBWdi7KY5wE+ihg/ZDzg+3RxJTRtM63wrwefE7Ob0qIsM1XPxAA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"2560a113cd8cde0e947ff58d0dd697b7270e495f0bdc86b72454658eed9e535b","last_reissued_at":"2026-07-05T06:09:44.363254Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T06:09:44.363254Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2208.09209","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":"2026-07-05T06:09:44Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"u/krnqI64Y4hMALZVHpBVqyhTG7diQW5V5OXrgYctbIdtae1pQuDS40chQLTxa0uHZLZT2DNNImxv6QkcEwVAw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-03T18:06:53.749241Z"},"content_sha256":"306d51a0f067bd6ed5c850f5a0febea6c3d331957c8dc7618792fb64e16df9d2","schema_version":"1.0","event_id":"sha256:306d51a0f067bd6ed5c850f5a0febea6c3d331957c8dc7618792fb64e16df9d2"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2022:EVQKCE6NRTPA5FD76WGQ3VUXW4","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Broadband multi-layer anti-reflection coatings with mullite and duroid for half-wave plates and alumina filters for CMB polarimetry","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.IM","authors_text":"Akito Kusaka, Charles Hill, Kana Sakaguri, Masaya Hasegawa, Yuki Sakurai","submitted_at":"2022-08-19T08:19:13Z","abstract_excerpt":"A broadband two-layer anti-reflection (AR) coating was developed for use on a sapphire half-wave plate (HWP) and an alumina infrared (IR) filter for cosmic microwave background (CMB) polarimetry. Measuring tiny CMB B-mode signals requires maximizing the number of photons reaching the detectors and minimizing spurious polarization due to reflection with an off-axis incident angle. However, a sapphire HWP and an alumina IR filter have high refractive indices of about 3.1, and an AR coating must be applied to them. Thermally sprayed mullite and Duroid 5880LZ were selected in terms of index and co"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2208.09209","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/2208.09209/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":"2026-07-05T06:09:44Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"P37o6F4UplCNwP5gfFPjXd4w4CBsQf79dBgYVsGbDDO7x9EhxahujpmHKqy/jwuiNuG5lgJD/w+04jP4EBtoDg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-03T18:06:53.749732Z"},"content_sha256":"6853a46a14283626615a6aa7c3635934846f971d87ba0d9f7a8f24f50503d06f","schema_version":"1.0","event_id":"sha256:6853a46a14283626615a6aa7c3635934846f971d87ba0d9f7a8f24f50503d06f"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/EVQKCE6NRTPA5FD76WGQ3VUXW4/bundle.json","state_url":"https://pith.science/pith/EVQKCE6NRTPA5FD76WGQ3VUXW4/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/EVQKCE6NRTPA5FD76WGQ3VUXW4/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":"2026-08-03T18:06:53Z","links":{"resolver":"https://pith.science/pith/EVQKCE6NRTPA5FD76WGQ3VUXW4","bundle":"https://pith.science/pith/EVQKCE6NRTPA5FD76WGQ3VUXW4/bundle.json","state":"https://pith.science/pith/EVQKCE6NRTPA5FD76WGQ3VUXW4/state.json","well_known_bundle":"https://pith.science/.well-known/pith/EVQKCE6NRTPA5FD76WGQ3VUXW4/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2022:EVQKCE6NRTPA5FD76WGQ3VUXW4","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":"c061fdfb93402e8d91b36e2b070b64880e741faff1c10b383977db28d307745a","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2022-08-19T08:19:13Z","title_canon_sha256":"5663928bacc16861eebaa975877da75084179ca4f0aef446942d99f7a6b6ca38"},"schema_version":"1.0","source":{"id":"2208.09209","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2208.09209","created_at":"2026-07-05T06:09:44Z"},{"alias_kind":"arxiv_version","alias_value":"2208.09209v1","created_at":"2026-07-05T06:09:44Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2208.09209","created_at":"2026-07-05T06:09:44Z"},{"alias_kind":"pith_short_12","alias_value":"EVQKCE6NRTPA","created_at":"2026-07-05T06:09:44Z"},{"alias_kind":"pith_short_16","alias_value":"EVQKCE6NRTPA5FD7","created_at":"2026-07-05T06:09:44Z"},{"alias_kind":"pith_short_8","alias_value":"EVQKCE6N","created_at":"2026-07-05T06:09:44Z"}],"graph_snapshots":[{"event_id":"sha256:6853a46a14283626615a6aa7c3635934846f971d87ba0d9f7a8f24f50503d06f","target":"graph","created_at":"2026-07-05T06:09:44Z","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/2208.09209/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"A broadband two-layer anti-reflection (AR) coating was developed for use on a sapphire half-wave plate (HWP) and an alumina infrared (IR) filter for cosmic microwave background (CMB) polarimetry. Measuring tiny CMB B-mode signals requires maximizing the number of photons reaching the detectors and minimizing spurious polarization due to reflection with an off-axis incident angle. However, a sapphire HWP and an alumina IR filter have high refractive indices of about 3.1, and an AR coating must be applied to them. Thermally sprayed mullite and Duroid 5880LZ were selected in terms of index and co","authors_text":"Akito Kusaka, Charles Hill, Kana Sakaguri, Masaya Hasegawa, Yuki Sakurai","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2022-08-19T08:19:13Z","title":"Broadband multi-layer anti-reflection coatings with mullite and duroid for half-wave plates and alumina filters for CMB polarimetry"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2208.09209","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":"sha256:306d51a0f067bd6ed5c850f5a0febea6c3d331957c8dc7618792fb64e16df9d2","target":"record","created_at":"2026-07-05T06:09:44Z","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":"c061fdfb93402e8d91b36e2b070b64880e741faff1c10b383977db28d307745a","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2022-08-19T08:19:13Z","title_canon_sha256":"5663928bacc16861eebaa975877da75084179ca4f0aef446942d99f7a6b6ca38"},"schema_version":"1.0","source":{"id":"2208.09209","kind":"arxiv","version":1}},"canonical_sha256":"2560a113cd8cde0e947ff58d0dd697b7270e495f0bdc86b72454658eed9e535b","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"2560a113cd8cde0e947ff58d0dd697b7270e495f0bdc86b72454658eed9e535b","first_computed_at":"2026-07-05T06:09:44.363254Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T06:09:44.363254Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"I95002yc4M/xDbdyQe48fDWwvq/h/uAXNhLIBWdi7KY5wE+ihg/ZDzg+3RxJTRtM63wrwefE7Ob0qIsM1XPxAA==","signature_status":"signed_v1","signed_at":"2026-07-05T06:09:44.363656Z","signed_message":"canonical_sha256_bytes"},"source_id":"2208.09209","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:306d51a0f067bd6ed5c850f5a0febea6c3d331957c8dc7618792fb64e16df9d2","sha256:6853a46a14283626615a6aa7c3635934846f971d87ba0d9f7a8f24f50503d06f"],"state_sha256":"87ef114995ef8fae7e2203c3e717ed426e86073013a973d26c5d909fc7ae7f37"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"GZT6c8OjLh915t7RKP//c+iQTfnQnEV+3Kx3Z9TvxTEoGmHksS6KBGswiSinjFGFAjt0polFJjwQrIm3YIX5AQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-03T18:06:53.754758Z","bundle_sha256":"8edd7628a7f8967dfe2271ff3fb4e7177fdf5abb76cc5d9d28a6d08625d10cbd"}}