{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2014:ZR47BGZ4RTD3XTREVYQS7IBSDL","short_pith_number":"pith:ZR47BGZ4","canonical_record":{"source":{"id":"1409.4846","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.soft","submitted_at":"2014-09-17T01:33:28Z","cross_cats_sorted":["cond-mat.mtrl-sci","physics.chem-ph"],"title_canon_sha256":"e2294b40d2ab58c6bb68e9af8a4445df37f35317e2a7f321344b8cfb9629e276","abstract_canon_sha256":"14f45772903838cdafddaf4d57d2ce889953a6bbcaa59c1958865e49e9609c3f"},"schema_version":"1.0"},"canonical_sha256":"cc79f09b3c8cc7bbce24ae212fa0321ad884011e23c0cf27266a549ba91f70e3","source":{"kind":"arxiv","id":"1409.4846","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1409.4846","created_at":"2026-05-18T02:30:31Z"},{"alias_kind":"arxiv_version","alias_value":"1409.4846v1","created_at":"2026-05-18T02:30:31Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1409.4846","created_at":"2026-05-18T02:30:31Z"},{"alias_kind":"pith_short_12","alias_value":"ZR47BGZ4RTD3","created_at":"2026-05-18T12:28:59Z"},{"alias_kind":"pith_short_16","alias_value":"ZR47BGZ4RTD3XTRE","created_at":"2026-05-18T12:28:59Z"},{"alias_kind":"pith_short_8","alias_value":"ZR47BGZ4","created_at":"2026-05-18T12:28:59Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2014:ZR47BGZ4RTD3XTREVYQS7IBSDL","target":"record","payload":{"canonical_record":{"source":{"id":"1409.4846","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.soft","submitted_at":"2014-09-17T01:33:28Z","cross_cats_sorted":["cond-mat.mtrl-sci","physics.chem-ph"],"title_canon_sha256":"e2294b40d2ab58c6bb68e9af8a4445df37f35317e2a7f321344b8cfb9629e276","abstract_canon_sha256":"14f45772903838cdafddaf4d57d2ce889953a6bbcaa59c1958865e49e9609c3f"},"schema_version":"1.0"},"canonical_sha256":"cc79f09b3c8cc7bbce24ae212fa0321ad884011e23c0cf27266a549ba91f70e3","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T02:30:31.606788Z","signature_b64":"X1JAATHA1Rh05AG9rlAuvGKqtZ5WAczcrDRFb7OS6+seTz2a8PP+byaoQxsUJiACP2CASuPb3148A0CGRu9ZAA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"cc79f09b3c8cc7bbce24ae212fa0321ad884011e23c0cf27266a549ba91f70e3","last_reissued_at":"2026-05-18T02:30:31.606195Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T02:30:31.606195Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1409.4846","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":"2026-05-18T02:30:31Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"qdPkm2sowCT3nI55hhzIFsxJiWlAjpWSP3EWYRWPi6bDIQoCPcA2fsF3AsUGlSNcskflaHgooV8KjniQPcQXAw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-24T20:09:42.658725Z"},"content_sha256":"0ff1830403ee49213c83afca7ed5e8854a1e9bba5637e0b4f3138ef3b4128327","schema_version":"1.0","event_id":"sha256:0ff1830403ee49213c83afca7ed5e8854a1e9bba5637e0b4f3138ef3b4128327"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2014:ZR47BGZ4RTD3XTREVYQS7IBSDL","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Birefringence of silica hydrogels prepared under high magnetic fields reinvestigated","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["cond-mat.mtrl-sci","physics.chem-ph"],"primary_cat":"cond-mat.soft","authors_text":"Atsushi Mori, Hidemitsu Furukawa, Kohki Takahashi, Masafumi Yamato, Takamasa Kaito","submitted_at":"2014-09-17T01:33:28Z","abstract_excerpt":"Birefringence is an indicator of structural anisotropy of materials. We measured the birefringence of Pb(II)-doped silica hydrogels prepared under a high magnetic field of various strengths. Because the silica is diamagnetic, one does not expect the structural anisotropy induced by a magnetic field. In previous work [Mori A, Kaito T, Furukawa H 2008 Mater. Lett. 62 3459-3461], we prepared samples in cylindrical cells made of borosilicate glass and obtained a preliminary result indicating a negative birefringence for samples prepared at 5T with the direction of the magnetic field being the opti"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1409.4846","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":"2026-05-18T02:30:31Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"l6evXh9n33+GxblOFTGgXMzHhDeGFzN8zoYPgkLhVtGvUYt/KY+bfHhGQkklpLqODkB4ZKYtcgXAK3SrhE6RDA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-24T20:09:42.659071Z"},"content_sha256":"233e896d91b36d447d6666c26d732e9d599b3caf78e1d6a8d535beeed1eb6278","schema_version":"1.0","event_id":"sha256:233e896d91b36d447d6666c26d732e9d599b3caf78e1d6a8d535beeed1eb6278"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/ZR47BGZ4RTD3XTREVYQS7IBSDL/bundle.json","state_url":"https://pith.science/pith/ZR47BGZ4RTD3XTREVYQS7IBSDL/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/ZR47BGZ4RTD3XTREVYQS7IBSDL/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":"2026-06-24T20:09:42Z","links":{"resolver":"https://pith.science/pith/ZR47BGZ4RTD3XTREVYQS7IBSDL","bundle":"https://pith.science/pith/ZR47BGZ4RTD3XTREVYQS7IBSDL/bundle.json","state":"https://pith.science/pith/ZR47BGZ4RTD3XTREVYQS7IBSDL/state.json","well_known_bundle":"https://pith.science/.well-known/pith/ZR47BGZ4RTD3XTREVYQS7IBSDL/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2014:ZR47BGZ4RTD3XTREVYQS7IBSDL","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":"14f45772903838cdafddaf4d57d2ce889953a6bbcaa59c1958865e49e9609c3f","cross_cats_sorted":["cond-mat.mtrl-sci","physics.chem-ph"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.soft","submitted_at":"2014-09-17T01:33:28Z","title_canon_sha256":"e2294b40d2ab58c6bb68e9af8a4445df37f35317e2a7f321344b8cfb9629e276"},"schema_version":"1.0","source":{"id":"1409.4846","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1409.4846","created_at":"2026-05-18T02:30:31Z"},{"alias_kind":"arxiv_version","alias_value":"1409.4846v1","created_at":"2026-05-18T02:30:31Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1409.4846","created_at":"2026-05-18T02:30:31Z"},{"alias_kind":"pith_short_12","alias_value":"ZR47BGZ4RTD3","created_at":"2026-05-18T12:28:59Z"},{"alias_kind":"pith_short_16","alias_value":"ZR47BGZ4RTD3XTRE","created_at":"2026-05-18T12:28:59Z"},{"alias_kind":"pith_short_8","alias_value":"ZR47BGZ4","created_at":"2026-05-18T12:28:59Z"}],"graph_snapshots":[{"event_id":"sha256:233e896d91b36d447d6666c26d732e9d599b3caf78e1d6a8d535beeed1eb6278","target":"graph","created_at":"2026-05-18T02:30:31Z","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":"Birefringence is an indicator of structural anisotropy of materials. We measured the birefringence of Pb(II)-doped silica hydrogels prepared under a high magnetic field of various strengths. Because the silica is diamagnetic, one does not expect the structural anisotropy induced by a magnetic field. In previous work [Mori A, Kaito T, Furukawa H 2008 Mater. Lett. 62 3459-3461], we prepared samples in cylindrical cells made of borosilicate glass and obtained a preliminary result indicating a negative birefringence for samples prepared at 5T with the direction of the magnetic field being the opti","authors_text":"Atsushi Mori, Hidemitsu Furukawa, Kohki Takahashi, Masafumi Yamato, Takamasa Kaito","cross_cats":["cond-mat.mtrl-sci","physics.chem-ph"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.soft","submitted_at":"2014-09-17T01:33:28Z","title":"Birefringence of silica hydrogels prepared under high magnetic fields reinvestigated"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1409.4846","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":"sha256:0ff1830403ee49213c83afca7ed5e8854a1e9bba5637e0b4f3138ef3b4128327","target":"record","created_at":"2026-05-18T02:30:31Z","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":"14f45772903838cdafddaf4d57d2ce889953a6bbcaa59c1958865e49e9609c3f","cross_cats_sorted":["cond-mat.mtrl-sci","physics.chem-ph"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.soft","submitted_at":"2014-09-17T01:33:28Z","title_canon_sha256":"e2294b40d2ab58c6bb68e9af8a4445df37f35317e2a7f321344b8cfb9629e276"},"schema_version":"1.0","source":{"id":"1409.4846","kind":"arxiv","version":1}},"canonical_sha256":"cc79f09b3c8cc7bbce24ae212fa0321ad884011e23c0cf27266a549ba91f70e3","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"cc79f09b3c8cc7bbce24ae212fa0321ad884011e23c0cf27266a549ba91f70e3","first_computed_at":"2026-05-18T02:30:31.606195Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T02:30:31.606195Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"X1JAATHA1Rh05AG9rlAuvGKqtZ5WAczcrDRFb7OS6+seTz2a8PP+byaoQxsUJiACP2CASuPb3148A0CGRu9ZAA==","signature_status":"signed_v1","signed_at":"2026-05-18T02:30:31.606788Z","signed_message":"canonical_sha256_bytes"},"source_id":"1409.4846","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:0ff1830403ee49213c83afca7ed5e8854a1e9bba5637e0b4f3138ef3b4128327","sha256:233e896d91b36d447d6666c26d732e9d599b3caf78e1d6a8d535beeed1eb6278"],"state_sha256":"0ca6dabac609e53c1dd3611bd798e5da10932e59b571b5efd6a21e2695efcad0"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"CLFqa/S5Hm7ELeE+ECjde7kN3EIAM2UlCJiWtzMZWSS0AVS3iQkMtr/oR6GhdauYpVplE0CwgJ/SJk83rVepCA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-24T20:09:42.660957Z","bundle_sha256":"a643761740902128899c7d63ef95a7c56017f9455da110a4e53a46b255c01abc"}}