{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2012:HTDD6FDOXWBMJMR5L4AJOTCZQ6","short_pith_number":"pith:HTDD6FDO","canonical_record":{"source":{"id":"1203.4060","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.ins-det","submitted_at":"2012-03-19T09:18:38Z","cross_cats_sorted":["hep-ex","nucl-ex"],"title_canon_sha256":"6f49d8e8aff174d34065b05c146886eb7e82fd34e5aeba05a2ba239464e88196","abstract_canon_sha256":"87bf59735f70955abec9d548d57c2ea1b06a82ae71df7c187aec084de3752b5d"},"schema_version":"1.0"},"canonical_sha256":"3cc63f146ebd82c4b23d5f00974c5987a4f809fe7cd22bd9e0d11c0b6c4d6ac7","source":{"kind":"arxiv","id":"1203.4060","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1203.4060","created_at":"2026-05-18T03:44:15Z"},{"alias_kind":"arxiv_version","alias_value":"1203.4060v1","created_at":"2026-05-18T03:44:15Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1203.4060","created_at":"2026-05-18T03:44:15Z"},{"alias_kind":"pith_short_12","alias_value":"HTDD6FDOXWBM","created_at":"2026-05-18T12:27:09Z"},{"alias_kind":"pith_short_16","alias_value":"HTDD6FDOXWBMJMR5","created_at":"2026-05-18T12:27:09Z"},{"alias_kind":"pith_short_8","alias_value":"HTDD6FDO","created_at":"2026-05-18T12:27:09Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2012:HTDD6FDOXWBMJMR5L4AJOTCZQ6","target":"record","payload":{"canonical_record":{"source":{"id":"1203.4060","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.ins-det","submitted_at":"2012-03-19T09:18:38Z","cross_cats_sorted":["hep-ex","nucl-ex"],"title_canon_sha256":"6f49d8e8aff174d34065b05c146886eb7e82fd34e5aeba05a2ba239464e88196","abstract_canon_sha256":"87bf59735f70955abec9d548d57c2ea1b06a82ae71df7c187aec084de3752b5d"},"schema_version":"1.0"},"canonical_sha256":"3cc63f146ebd82c4b23d5f00974c5987a4f809fe7cd22bd9e0d11c0b6c4d6ac7","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T03:44:15.320767Z","signature_b64":"1vJRdwH8hnaYSeIhEMKVUplJPB1jHL1wZ7LmuXrU8CH8+zjHzyLoXq3InmwGA5guJv9Jl0nzqBogXydvTplFBg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"3cc63f146ebd82c4b23d5f00974c5987a4f809fe7cd22bd9e0d11c0b6c4d6ac7","last_reissued_at":"2026-05-18T03:44:15.320087Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T03:44:15.320087Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1203.4060","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":"2026-05-18T03:44:15Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"uRMRKdKRQDgKE5conTxxB34UW4t2/6r6e+b3DdfWu8z0njirCrA6C5m3yjtmfo/8e0ZUTtVN3xCNETFWAqiGAg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-07T14:20:00.189557Z"},"content_sha256":"b8ed79f394f6af15bd76448a732d258a390ef7715cc1540b1684e80a06c96fde","schema_version":"1.0","event_id":"sha256:b8ed79f394f6af15bd76448a732d258a390ef7715cc1540b1684e80a06c96fde"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2012:HTDD6FDOXWBMJMR5L4AJOTCZQ6","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Recent progress in silica aerogel Cherenkov radiator","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["hep-ex","nucl-ex"],"primary_cat":"physics.ins-det","authors_text":"Hideyuki Kawai, Ichiro Adachi, Makoto Tabata, Masato Kubo, Takeshi Sato","submitted_at":"2012-03-19T09:18:38Z","abstract_excerpt":"In this paper, we present recent progress in the development of hydrophobic silica aerogel as a Cherenkov radiator. In addition to the conventional method, the recently developed pin-drying method for producing high-refractive-index aerogels with high transparency was studied in detail. Optical qualities and large tile handling for crack-free aerogels were investigated. Sufficient photons were detected from high-performance aerogels in a beam test."},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1203.4060","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":"2026-05-18T03:44:15Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"eAozUpQwLaPlnpqBfe32SdjVqWXUFHAzO3Vyly+ZmD77RcFQTn2DRs4lRWD54wt2hz3xxDM90kUMllCNT01yCg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-07T14:20:00.190253Z"},"content_sha256":"b6ff2470366cd311b3e4f1768d5b4bc03dd631a5f3aa4b5af2c619a3b943ad88","schema_version":"1.0","event_id":"sha256:b6ff2470366cd311b3e4f1768d5b4bc03dd631a5f3aa4b5af2c619a3b943ad88"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/HTDD6FDOXWBMJMR5L4AJOTCZQ6/bundle.json","state_url":"https://pith.science/pith/HTDD6FDOXWBMJMR5L4AJOTCZQ6/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/HTDD6FDOXWBMJMR5L4AJOTCZQ6/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":"2026-06-07T14:20:00Z","links":{"resolver":"https://pith.science/pith/HTDD6FDOXWBMJMR5L4AJOTCZQ6","bundle":"https://pith.science/pith/HTDD6FDOXWBMJMR5L4AJOTCZQ6/bundle.json","state":"https://pith.science/pith/HTDD6FDOXWBMJMR5L4AJOTCZQ6/state.json","well_known_bundle":"https://pith.science/.well-known/pith/HTDD6FDOXWBMJMR5L4AJOTCZQ6/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2012:HTDD6FDOXWBMJMR5L4AJOTCZQ6","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":"87bf59735f70955abec9d548d57c2ea1b06a82ae71df7c187aec084de3752b5d","cross_cats_sorted":["hep-ex","nucl-ex"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.ins-det","submitted_at":"2012-03-19T09:18:38Z","title_canon_sha256":"6f49d8e8aff174d34065b05c146886eb7e82fd34e5aeba05a2ba239464e88196"},"schema_version":"1.0","source":{"id":"1203.4060","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1203.4060","created_at":"2026-05-18T03:44:15Z"},{"alias_kind":"arxiv_version","alias_value":"1203.4060v1","created_at":"2026-05-18T03:44:15Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1203.4060","created_at":"2026-05-18T03:44:15Z"},{"alias_kind":"pith_short_12","alias_value":"HTDD6FDOXWBM","created_at":"2026-05-18T12:27:09Z"},{"alias_kind":"pith_short_16","alias_value":"HTDD6FDOXWBMJMR5","created_at":"2026-05-18T12:27:09Z"},{"alias_kind":"pith_short_8","alias_value":"HTDD6FDO","created_at":"2026-05-18T12:27:09Z"}],"graph_snapshots":[{"event_id":"sha256:b6ff2470366cd311b3e4f1768d5b4bc03dd631a5f3aa4b5af2c619a3b943ad88","target":"graph","created_at":"2026-05-18T03:44:15Z","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":"In this paper, we present recent progress in the development of hydrophobic silica aerogel as a Cherenkov radiator. In addition to the conventional method, the recently developed pin-drying method for producing high-refractive-index aerogels with high transparency was studied in detail. Optical qualities and large tile handling for crack-free aerogels were investigated. Sufficient photons were detected from high-performance aerogels in a beam test.","authors_text":"Hideyuki Kawai, Ichiro Adachi, Makoto Tabata, Masato Kubo, Takeshi Sato","cross_cats":["hep-ex","nucl-ex"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.ins-det","submitted_at":"2012-03-19T09:18:38Z","title":"Recent progress in silica aerogel Cherenkov radiator"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1203.4060","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:b8ed79f394f6af15bd76448a732d258a390ef7715cc1540b1684e80a06c96fde","target":"record","created_at":"2026-05-18T03:44:15Z","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":"87bf59735f70955abec9d548d57c2ea1b06a82ae71df7c187aec084de3752b5d","cross_cats_sorted":["hep-ex","nucl-ex"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.ins-det","submitted_at":"2012-03-19T09:18:38Z","title_canon_sha256":"6f49d8e8aff174d34065b05c146886eb7e82fd34e5aeba05a2ba239464e88196"},"schema_version":"1.0","source":{"id":"1203.4060","kind":"arxiv","version":1}},"canonical_sha256":"3cc63f146ebd82c4b23d5f00974c5987a4f809fe7cd22bd9e0d11c0b6c4d6ac7","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"3cc63f146ebd82c4b23d5f00974c5987a4f809fe7cd22bd9e0d11c0b6c4d6ac7","first_computed_at":"2026-05-18T03:44:15.320087Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T03:44:15.320087Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"1vJRdwH8hnaYSeIhEMKVUplJPB1jHL1wZ7LmuXrU8CH8+zjHzyLoXq3InmwGA5guJv9Jl0nzqBogXydvTplFBg==","signature_status":"signed_v1","signed_at":"2026-05-18T03:44:15.320767Z","signed_message":"canonical_sha256_bytes"},"source_id":"1203.4060","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:b8ed79f394f6af15bd76448a732d258a390ef7715cc1540b1684e80a06c96fde","sha256:b6ff2470366cd311b3e4f1768d5b4bc03dd631a5f3aa4b5af2c619a3b943ad88"],"state_sha256":"8aaa64413e7eb7d2901e93d20164feae8e2c5ec0552a84100410c8fa213c9edd"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"9mE9yrB71AehIvMPGB3VnO579G7Ak4iEacxMDSTL4QMJkthqB0XOuSSVcsXydHsfv9uvqp2P2yTrJqCmsqWdBQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-07T14:20:00.195408Z","bundle_sha256":"e78180d3431220e9886b13f088ad4c25d3d95a517fa4acbe6514e8f08aa6c03b"}}