{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2015:EN4LFTSYGAWLHUMADN4TPT6ZIJ","short_pith_number":"pith:EN4LFTSY","canonical_record":{"source":{"id":"1509.02566","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.optics","submitted_at":"2015-09-08T21:50:01Z","cross_cats_sorted":[],"title_canon_sha256":"199640b8848aac1ad5ab8d4cf4429bf8d99c1877428e93bec6992e186b29c526","abstract_canon_sha256":"402660435c82729c48e05302167840a9307af79f6817327e112681a168c1db6f"},"schema_version":"1.0"},"canonical_sha256":"2378b2ce58302cb3d1801b7937cfd94264d6c7095dd15132de9bbcf785f5fad2","source":{"kind":"arxiv","id":"1509.02566","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1509.02566","created_at":"2026-05-18T01:23:55Z"},{"alias_kind":"arxiv_version","alias_value":"1509.02566v2","created_at":"2026-05-18T01:23:55Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1509.02566","created_at":"2026-05-18T01:23:55Z"},{"alias_kind":"pith_short_12","alias_value":"EN4LFTSYGAWL","created_at":"2026-05-18T12:29:19Z"},{"alias_kind":"pith_short_16","alias_value":"EN4LFTSYGAWLHUMA","created_at":"2026-05-18T12:29:19Z"},{"alias_kind":"pith_short_8","alias_value":"EN4LFTSY","created_at":"2026-05-18T12:29:19Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2015:EN4LFTSYGAWLHUMADN4TPT6ZIJ","target":"record","payload":{"canonical_record":{"source":{"id":"1509.02566","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.optics","submitted_at":"2015-09-08T21:50:01Z","cross_cats_sorted":[],"title_canon_sha256":"199640b8848aac1ad5ab8d4cf4429bf8d99c1877428e93bec6992e186b29c526","abstract_canon_sha256":"402660435c82729c48e05302167840a9307af79f6817327e112681a168c1db6f"},"schema_version":"1.0"},"canonical_sha256":"2378b2ce58302cb3d1801b7937cfd94264d6c7095dd15132de9bbcf785f5fad2","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:23:55.500222Z","signature_b64":"Dn4Db8GkISTf/bDZhOvwyQfZuKEvxlytMc+iDnDDqpVQVmP2tDPX5jCKxRLnUvqSW17gqk14KpcEg3KkuUUlAg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"2378b2ce58302cb3d1801b7937cfd94264d6c7095dd15132de9bbcf785f5fad2","last_reissued_at":"2026-05-18T01:23:55.499515Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:23:55.499515Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1509.02566","source_version":2,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T01:23:55Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"Z+L7klpUPwgLOdEGXCkLTx1WSMF687rcybIypqsyhK3naYxv5fhrGLoj0+M/82850nzFoKbJXFwGSs19+wuPCw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-01T11:35:40.931952Z"},"content_sha256":"bffd567d543d14f9277df162dce80b3c824f0b004ec1937131eec2798859cb62","schema_version":"1.0","event_id":"sha256:bffd567d543d14f9277df162dce80b3c824f0b004ec1937131eec2798859cb62"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2015:EN4LFTSYGAWLHUMADN4TPT6ZIJ","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Experimental investigation of circular Bragg phenomenon exhibited by a mirror-backed chiral sculptured thin film","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"physics.optics","authors_text":"Akhlesh Lakhtakia, Christian M. Graham, Sema Erten, Stephen E. Swiontek","submitted_at":"2015-09-08T21:50:01Z","abstract_excerpt":"Experimentation with obliquely incident light established that all four circular reflectances of a chiral sculptured thin film backed by a metallic mirror contain strong evidence of the circular Bragg phenomenon. When the mirror is removed, strong evidence of that phenomenon is found only in the spectrum of the co-polarized and co-handed reflectance."},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1509.02566","kind":"arxiv","version":2},"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":"2026-05-18T01:23:55Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"Fw1nVHRofFbIOuo3DwPqWxUxq+FSzJkE7fLa3K/9fGTacnx2FcdNekLACedNlvQ/oqWmaIBKay8mz70b1xK1Bg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-01T11:35:40.932294Z"},"content_sha256":"e4b3295d6ae5c231e38032b99dac312203f6b38584fef6853dbb22f017ad2b5c","schema_version":"1.0","event_id":"sha256:e4b3295d6ae5c231e38032b99dac312203f6b38584fef6853dbb22f017ad2b5c"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/EN4LFTSYGAWLHUMADN4TPT6ZIJ/bundle.json","state_url":"https://pith.science/pith/EN4LFTSYGAWLHUMADN4TPT6ZIJ/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/EN4LFTSYGAWLHUMADN4TPT6ZIJ/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":"2026-06-01T11:35:40Z","links":{"resolver":"https://pith.science/pith/EN4LFTSYGAWLHUMADN4TPT6ZIJ","bundle":"https://pith.science/pith/EN4LFTSYGAWLHUMADN4TPT6ZIJ/bundle.json","state":"https://pith.science/pith/EN4LFTSYGAWLHUMADN4TPT6ZIJ/state.json","well_known_bundle":"https://pith.science/.well-known/pith/EN4LFTSYGAWLHUMADN4TPT6ZIJ/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2015:EN4LFTSYGAWLHUMADN4TPT6ZIJ","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":"402660435c82729c48e05302167840a9307af79f6817327e112681a168c1db6f","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.optics","submitted_at":"2015-09-08T21:50:01Z","title_canon_sha256":"199640b8848aac1ad5ab8d4cf4429bf8d99c1877428e93bec6992e186b29c526"},"schema_version":"1.0","source":{"id":"1509.02566","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1509.02566","created_at":"2026-05-18T01:23:55Z"},{"alias_kind":"arxiv_version","alias_value":"1509.02566v2","created_at":"2026-05-18T01:23:55Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1509.02566","created_at":"2026-05-18T01:23:55Z"},{"alias_kind":"pith_short_12","alias_value":"EN4LFTSYGAWL","created_at":"2026-05-18T12:29:19Z"},{"alias_kind":"pith_short_16","alias_value":"EN4LFTSYGAWLHUMA","created_at":"2026-05-18T12:29:19Z"},{"alias_kind":"pith_short_8","alias_value":"EN4LFTSY","created_at":"2026-05-18T12:29:19Z"}],"graph_snapshots":[{"event_id":"sha256:e4b3295d6ae5c231e38032b99dac312203f6b38584fef6853dbb22f017ad2b5c","target":"graph","created_at":"2026-05-18T01:23:55Z","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":"Experimentation with obliquely incident light established that all four circular reflectances of a chiral sculptured thin film backed by a metallic mirror contain strong evidence of the circular Bragg phenomenon. When the mirror is removed, strong evidence of that phenomenon is found only in the spectrum of the co-polarized and co-handed reflectance.","authors_text":"Akhlesh Lakhtakia, Christian M. Graham, Sema Erten, Stephen E. Swiontek","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.optics","submitted_at":"2015-09-08T21:50:01Z","title":"Experimental investigation of circular Bragg phenomenon exhibited by a mirror-backed chiral sculptured thin film"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1509.02566","kind":"arxiv","version":2},"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:bffd567d543d14f9277df162dce80b3c824f0b004ec1937131eec2798859cb62","target":"record","created_at":"2026-05-18T01:23:55Z","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":"402660435c82729c48e05302167840a9307af79f6817327e112681a168c1db6f","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.optics","submitted_at":"2015-09-08T21:50:01Z","title_canon_sha256":"199640b8848aac1ad5ab8d4cf4429bf8d99c1877428e93bec6992e186b29c526"},"schema_version":"1.0","source":{"id":"1509.02566","kind":"arxiv","version":2}},"canonical_sha256":"2378b2ce58302cb3d1801b7937cfd94264d6c7095dd15132de9bbcf785f5fad2","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"2378b2ce58302cb3d1801b7937cfd94264d6c7095dd15132de9bbcf785f5fad2","first_computed_at":"2026-05-18T01:23:55.499515Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:23:55.499515Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"Dn4Db8GkISTf/bDZhOvwyQfZuKEvxlytMc+iDnDDqpVQVmP2tDPX5jCKxRLnUvqSW17gqk14KpcEg3KkuUUlAg==","signature_status":"signed_v1","signed_at":"2026-05-18T01:23:55.500222Z","signed_message":"canonical_sha256_bytes"},"source_id":"1509.02566","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:bffd567d543d14f9277df162dce80b3c824f0b004ec1937131eec2798859cb62","sha256:e4b3295d6ae5c231e38032b99dac312203f6b38584fef6853dbb22f017ad2b5c"],"state_sha256":"76ab3692b874f4ff2b169a23f4e3336316fc9b2ecb9db74aa7e368b33cc32333"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"CWg4YAlvYKkUccrFjrwp4z9xE3+rnSvB9XCRcDBCFJ8xO9b77Qiv9n4rToigG5OBb/tKsgCmJ2JNxRN3N1IDAg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-01T11:35:40.934202Z","bundle_sha256":"f230d5fd6b5e5a5a81dffb03ea4a108686a559bfc617cd042684b4b425b22264"}}