{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2007:XYCOB32U2JVVEBYW52ITAWGEXY","short_pith_number":"pith:XYCOB32U","canonical_record":{"source":{"id":"0711.2494","kind":"arxiv","version":2},"metadata":{"license":"","primary_cat":"cond-mat.supr-con","submitted_at":"2007-11-15T19:33:54Z","cross_cats_sorted":[],"title_canon_sha256":"0eeb612500c020a6903ea08e2e2cdbf7633a6f848e18128b78961a6baebd386e","abstract_canon_sha256":"a86c6f09d8f5ee694797f057d984ffc4b95af6b1376f599e71d473a69b6a1aa2"},"schema_version":"1.0"},"canonical_sha256":"be04e0ef54d26b520716ee913058c4be355c9835c96e7022d7fd9b80600f6c70","source":{"kind":"arxiv","id":"0711.2494","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"0711.2494","created_at":"2026-07-04T17:06:42Z"},{"alias_kind":"arxiv_version","alias_value":"0711.2494v2","created_at":"2026-07-04T17:06:42Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.0711.2494","created_at":"2026-07-04T17:06:42Z"},{"alias_kind":"pith_short_12","alias_value":"XYCOB32U2JVV","created_at":"2026-07-04T17:06:42Z"},{"alias_kind":"pith_short_16","alias_value":"XYCOB32U2JVVEBYW","created_at":"2026-07-04T17:06:42Z"},{"alias_kind":"pith_short_8","alias_value":"XYCOB32U","created_at":"2026-07-04T17:06:42Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2007:XYCOB32U2JVVEBYW52ITAWGEXY","target":"record","payload":{"canonical_record":{"source":{"id":"0711.2494","kind":"arxiv","version":2},"metadata":{"license":"","primary_cat":"cond-mat.supr-con","submitted_at":"2007-11-15T19:33:54Z","cross_cats_sorted":[],"title_canon_sha256":"0eeb612500c020a6903ea08e2e2cdbf7633a6f848e18128b78961a6baebd386e","abstract_canon_sha256":"a86c6f09d8f5ee694797f057d984ffc4b95af6b1376f599e71d473a69b6a1aa2"},"schema_version":"1.0"},"canonical_sha256":"be04e0ef54d26b520716ee913058c4be355c9835c96e7022d7fd9b80600f6c70","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-04T17:06:42.865303Z","signature_b64":"XQXIA1AgmKFofN2bEBlVFWameS3Zym6lAjjiDrKJGUxKb3SNt0EKfLQ26ld7jrcIBoADuiTIFSZYHomxrI9XAA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"be04e0ef54d26b520716ee913058c4be355c9835c96e7022d7fd9b80600f6c70","last_reissued_at":"2026-07-04T17:06:42.864905Z","signature_status":"signed_v1","first_computed_at":"2026-07-04T17:06:42.864905Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"0711.2494","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":"2026-07-04T17:06:42Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"hUjw+g3bF2yyQbmAhib0f6HL0vkLMQKcyBHELQnYUAUFvgcAzVRTJL9M9jrYpUIN8ufyQG1tGNZfQrHYVgzyCw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-03T16:10:57.258123Z"},"content_sha256":"145cbc9a492e9614cb2701f87565f1f8395ff51a99b5a4928d23d86294463cd1","schema_version":"1.0","event_id":"sha256:145cbc9a492e9614cb2701f87565f1f8395ff51a99b5a4928d23d86294463cd1"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2007:XYCOB32U2JVVEBYW52ITAWGEXY","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Polar Kerr Effect Measurements of YBa2Cu3O6+x: Evidence for Broken Symmetry Near the Pseudogap Temperature","license":"","headline":"","cross_cats":[],"primary_cat":"cond-mat.supr-con","authors_text":"A. Kapitulnik, D. A. Bonn, Elizabeth Schemm, G. Deutscher, G. Koster, Jing Xia, M. M. Fejer, R. Liang, S.A. Kivelson, W. N. Hardy, W. Siemons","submitted_at":"2007-11-15T19:33:54Z","abstract_excerpt":"Polar Kerr effect in the high-Tc superconductor \\YBCO was measured at zero magnetic field with high precision using a cyogenic Sagnac fiber interferometer. We observed non-zero Kerr rotations of order $\\sim 1 \\mu$rad appearing near the pseudogap temperature $T^*$, and marking what appears to be a true phase transition. Anomalous magnetic behavior in magnetic-field training of the effect suggests that time reversal symmetry is already broken above room temperature."},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0711.2494","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":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/0711.2494/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":"2026-07-04T17:06:42Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"fFjg5sxlhPSwv45Uculb5IqRoBHHDia5MgE8NrZ/271glot4DuqSlN3qc2vAHS6KnxVGnuDix8+kqFezoe5LAw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-03T16:10:57.263425Z"},"content_sha256":"195a25491d3ed637d7188d80efdc238aaa38b352b5fd6ea2eceac37883a9e8b6","schema_version":"1.0","event_id":"sha256:195a25491d3ed637d7188d80efdc238aaa38b352b5fd6ea2eceac37883a9e8b6"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/XYCOB32U2JVVEBYW52ITAWGEXY/bundle.json","state_url":"https://pith.science/pith/XYCOB32U2JVVEBYW52ITAWGEXY/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/XYCOB32U2JVVEBYW52ITAWGEXY/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":"2026-08-03T16:10:57Z","links":{"resolver":"https://pith.science/pith/XYCOB32U2JVVEBYW52ITAWGEXY","bundle":"https://pith.science/pith/XYCOB32U2JVVEBYW52ITAWGEXY/bundle.json","state":"https://pith.science/pith/XYCOB32U2JVVEBYW52ITAWGEXY/state.json","well_known_bundle":"https://pith.science/.well-known/pith/XYCOB32U2JVVEBYW52ITAWGEXY/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2007:XYCOB32U2JVVEBYW52ITAWGEXY","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":"a86c6f09d8f5ee694797f057d984ffc4b95af6b1376f599e71d473a69b6a1aa2","cross_cats_sorted":[],"license":"","primary_cat":"cond-mat.supr-con","submitted_at":"2007-11-15T19:33:54Z","title_canon_sha256":"0eeb612500c020a6903ea08e2e2cdbf7633a6f848e18128b78961a6baebd386e"},"schema_version":"1.0","source":{"id":"0711.2494","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"0711.2494","created_at":"2026-07-04T17:06:42Z"},{"alias_kind":"arxiv_version","alias_value":"0711.2494v2","created_at":"2026-07-04T17:06:42Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.0711.2494","created_at":"2026-07-04T17:06:42Z"},{"alias_kind":"pith_short_12","alias_value":"XYCOB32U2JVV","created_at":"2026-07-04T17:06:42Z"},{"alias_kind":"pith_short_16","alias_value":"XYCOB32U2JVVEBYW","created_at":"2026-07-04T17:06:42Z"},{"alias_kind":"pith_short_8","alias_value":"XYCOB32U","created_at":"2026-07-04T17:06:42Z"}],"graph_snapshots":[{"event_id":"sha256:195a25491d3ed637d7188d80efdc238aaa38b352b5fd6ea2eceac37883a9e8b6","target":"graph","created_at":"2026-07-04T17:06:42Z","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/0711.2494/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"Polar Kerr effect in the high-Tc superconductor \\YBCO was measured at zero magnetic field with high precision using a cyogenic Sagnac fiber interferometer. We observed non-zero Kerr rotations of order $\\sim 1 \\mu$rad appearing near the pseudogap temperature $T^*$, and marking what appears to be a true phase transition. Anomalous magnetic behavior in magnetic-field training of the effect suggests that time reversal symmetry is already broken above room temperature.","authors_text":"A. Kapitulnik, D. A. Bonn, Elizabeth Schemm, G. Deutscher, G. Koster, Jing Xia, M. M. Fejer, R. Liang, S.A. Kivelson, W. N. Hardy, W. Siemons","cross_cats":[],"headline":"","license":"","primary_cat":"cond-mat.supr-con","submitted_at":"2007-11-15T19:33:54Z","title":"Polar Kerr Effect Measurements of YBa2Cu3O6+x: Evidence for Broken Symmetry Near the Pseudogap Temperature"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0711.2494","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":"sha256:145cbc9a492e9614cb2701f87565f1f8395ff51a99b5a4928d23d86294463cd1","target":"record","created_at":"2026-07-04T17:06:42Z","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":"a86c6f09d8f5ee694797f057d984ffc4b95af6b1376f599e71d473a69b6a1aa2","cross_cats_sorted":[],"license":"","primary_cat":"cond-mat.supr-con","submitted_at":"2007-11-15T19:33:54Z","title_canon_sha256":"0eeb612500c020a6903ea08e2e2cdbf7633a6f848e18128b78961a6baebd386e"},"schema_version":"1.0","source":{"id":"0711.2494","kind":"arxiv","version":2}},"canonical_sha256":"be04e0ef54d26b520716ee913058c4be355c9835c96e7022d7fd9b80600f6c70","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"be04e0ef54d26b520716ee913058c4be355c9835c96e7022d7fd9b80600f6c70","first_computed_at":"2026-07-04T17:06:42.864905Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-04T17:06:42.864905Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"XQXIA1AgmKFofN2bEBlVFWameS3Zym6lAjjiDrKJGUxKb3SNt0EKfLQ26ld7jrcIBoADuiTIFSZYHomxrI9XAA==","signature_status":"signed_v1","signed_at":"2026-07-04T17:06:42.865303Z","signed_message":"canonical_sha256_bytes"},"source_id":"0711.2494","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:145cbc9a492e9614cb2701f87565f1f8395ff51a99b5a4928d23d86294463cd1","sha256:195a25491d3ed637d7188d80efdc238aaa38b352b5fd6ea2eceac37883a9e8b6"],"state_sha256":"33e9349030fcde9563f44c758da5ef8185289032cadadd0ed4537a3f1aded7d7"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"iPpB8KTPthNovHKZ6GbsYrCoPT1gGLqnDBFSrgIR00NZwX5xpCdGRRg97zIpoIO9qyCzXzbSey6vGawvyWrYAw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-03T16:10:57.279437Z","bundle_sha256":"4a5e174cf48fca58b1780a456e47be52080d7481cd49ca1881c5fae49fdd579d"}}