{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2014:GB3WK3HK5L62DSW2PCGMQ5K2DD","short_pith_number":"pith:GB3WK3HK","canonical_record":{"source":{"id":"1405.2422","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2014-05-10T11:42:16Z","cross_cats_sorted":[],"title_canon_sha256":"414f3ab6599e1f7d7f733e4a6df46bf615c19c5d9af00eba7ba3ad12304020dd","abstract_canon_sha256":"d4d6c2782b95634861f503865495555bcdb98fad0c045b9e46ce52c1e859658d"},"schema_version":"1.0"},"canonical_sha256":"3077656ceaeafda1cada788cc8755a18f3ac31de26143dfce1fb4321432b135c","source":{"kind":"arxiv","id":"1405.2422","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1405.2422","created_at":"2026-05-18T02:48:35Z"},{"alias_kind":"arxiv_version","alias_value":"1405.2422v2","created_at":"2026-05-18T02:48:35Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1405.2422","created_at":"2026-05-18T02:48:35Z"},{"alias_kind":"pith_short_12","alias_value":"GB3WK3HK5L62","created_at":"2026-05-18T12:28:30Z"},{"alias_kind":"pith_short_16","alias_value":"GB3WK3HK5L62DSW2","created_at":"2026-05-18T12:28:30Z"},{"alias_kind":"pith_short_8","alias_value":"GB3WK3HK","created_at":"2026-05-18T12:28:30Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2014:GB3WK3HK5L62DSW2PCGMQ5K2DD","target":"record","payload":{"canonical_record":{"source":{"id":"1405.2422","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2014-05-10T11:42:16Z","cross_cats_sorted":[],"title_canon_sha256":"414f3ab6599e1f7d7f733e4a6df46bf615c19c5d9af00eba7ba3ad12304020dd","abstract_canon_sha256":"d4d6c2782b95634861f503865495555bcdb98fad0c045b9e46ce52c1e859658d"},"schema_version":"1.0"},"canonical_sha256":"3077656ceaeafda1cada788cc8755a18f3ac31de26143dfce1fb4321432b135c","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T02:48:35.888830Z","signature_b64":"VxpZftVAh3Tf0VKUzuVYXjqqvnKgl20Duiagx9LvHYs3jhaCBrlaBtNnhxHH2M0fIOd4NCull8NHIz8j3ndgAQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"3077656ceaeafda1cada788cc8755a18f3ac31de26143dfce1fb4321432b135c","last_reissued_at":"2026-05-18T02:48:35.888103Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T02:48:35.888103Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1405.2422","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":"2026-05-18T02:48:35Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"YP7ySeSw0fMniE2VW/eisM/8vRexu6kr6A+HospO1xqE6sXAYMpHWKtUU23ArdgX80fC5s3eEJVU0O/BOjX/Ag==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-05T06:19:29.939577Z"},"content_sha256":"2ad97829b9bcab396a19bcdbbddc9f4f3588ad72ade916bb2a42fb5d9aee0ba0","schema_version":"1.0","event_id":"sha256:2ad97829b9bcab396a19bcdbbddc9f4f3588ad72ade916bb2a42fb5d9aee0ba0"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2014:GB3WK3HK5L62DSW2PCGMQ5K2DD","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Common origin of exotic properties in ceramic and hybrid negative thermal expansion materials","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"cond-mat.mtrl-sci","authors_text":"Anthony E. Phillips, Hong Fang, Martin T. Dove","submitted_at":"2014-05-10T11:42:16Z","abstract_excerpt":"Many ceramic and hybrid metal-organic framework materials show negative thermal expansion (NTE): they \\textit{contract} instead of expanding on heating \\cite{Barrera_Miller_Lind_Romao 2005}. Their structures are invariably characterised as a network of polyhedral groups of atoms that are connected through sharing of corner atoms or by shared ligands. Empirically, NTE materials tend to show pressure-induced softening, pressure enhancement of NTE, and the reduction of NTE on heating. But such effects have only been investigated in a small number of materials \\cite{Pantea 2006,Chapman 2005,Chapma"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1405.2422","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":"2026-05-18T02:48:35Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"1yjNwidcvVDiEAcnGJO+274tuhGcClm0LY4c/KJZReDjdkd6xGXz4KmQ9XbadiM/cS6jYVwkPzffaoUShbuoDQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-05T06:19:29.940241Z"},"content_sha256":"26359bb2b69d87216d601e0c623529937649808e4d8f7c1310c15670f574f5bf","schema_version":"1.0","event_id":"sha256:26359bb2b69d87216d601e0c623529937649808e4d8f7c1310c15670f574f5bf"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/GB3WK3HK5L62DSW2PCGMQ5K2DD/bundle.json","state_url":"https://pith.science/pith/GB3WK3HK5L62DSW2PCGMQ5K2DD/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/GB3WK3HK5L62DSW2PCGMQ5K2DD/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":"2026-06-05T06:19:29Z","links":{"resolver":"https://pith.science/pith/GB3WK3HK5L62DSW2PCGMQ5K2DD","bundle":"https://pith.science/pith/GB3WK3HK5L62DSW2PCGMQ5K2DD/bundle.json","state":"https://pith.science/pith/GB3WK3HK5L62DSW2PCGMQ5K2DD/state.json","well_known_bundle":"https://pith.science/.well-known/pith/GB3WK3HK5L62DSW2PCGMQ5K2DD/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2014:GB3WK3HK5L62DSW2PCGMQ5K2DD","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":"d4d6c2782b95634861f503865495555bcdb98fad0c045b9e46ce52c1e859658d","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2014-05-10T11:42:16Z","title_canon_sha256":"414f3ab6599e1f7d7f733e4a6df46bf615c19c5d9af00eba7ba3ad12304020dd"},"schema_version":"1.0","source":{"id":"1405.2422","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1405.2422","created_at":"2026-05-18T02:48:35Z"},{"alias_kind":"arxiv_version","alias_value":"1405.2422v2","created_at":"2026-05-18T02:48:35Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1405.2422","created_at":"2026-05-18T02:48:35Z"},{"alias_kind":"pith_short_12","alias_value":"GB3WK3HK5L62","created_at":"2026-05-18T12:28:30Z"},{"alias_kind":"pith_short_16","alias_value":"GB3WK3HK5L62DSW2","created_at":"2026-05-18T12:28:30Z"},{"alias_kind":"pith_short_8","alias_value":"GB3WK3HK","created_at":"2026-05-18T12:28:30Z"}],"graph_snapshots":[{"event_id":"sha256:26359bb2b69d87216d601e0c623529937649808e4d8f7c1310c15670f574f5bf","target":"graph","created_at":"2026-05-18T02:48:35Z","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":"Many ceramic and hybrid metal-organic framework materials show negative thermal expansion (NTE): they \\textit{contract} instead of expanding on heating \\cite{Barrera_Miller_Lind_Romao 2005}. Their structures are invariably characterised as a network of polyhedral groups of atoms that are connected through sharing of corner atoms or by shared ligands. Empirically, NTE materials tend to show pressure-induced softening, pressure enhancement of NTE, and the reduction of NTE on heating. But such effects have only been investigated in a small number of materials \\cite{Pantea 2006,Chapman 2005,Chapma","authors_text":"Anthony E. Phillips, Hong Fang, Martin T. Dove","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2014-05-10T11:42:16Z","title":"Common origin of exotic properties in ceramic and hybrid negative thermal expansion materials"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1405.2422","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":"sha256:2ad97829b9bcab396a19bcdbbddc9f4f3588ad72ade916bb2a42fb5d9aee0ba0","target":"record","created_at":"2026-05-18T02:48:35Z","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":"d4d6c2782b95634861f503865495555bcdb98fad0c045b9e46ce52c1e859658d","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2014-05-10T11:42:16Z","title_canon_sha256":"414f3ab6599e1f7d7f733e4a6df46bf615c19c5d9af00eba7ba3ad12304020dd"},"schema_version":"1.0","source":{"id":"1405.2422","kind":"arxiv","version":2}},"canonical_sha256":"3077656ceaeafda1cada788cc8755a18f3ac31de26143dfce1fb4321432b135c","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"3077656ceaeafda1cada788cc8755a18f3ac31de26143dfce1fb4321432b135c","first_computed_at":"2026-05-18T02:48:35.888103Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T02:48:35.888103Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"VxpZftVAh3Tf0VKUzuVYXjqqvnKgl20Duiagx9LvHYs3jhaCBrlaBtNnhxHH2M0fIOd4NCull8NHIz8j3ndgAQ==","signature_status":"signed_v1","signed_at":"2026-05-18T02:48:35.888830Z","signed_message":"canonical_sha256_bytes"},"source_id":"1405.2422","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:2ad97829b9bcab396a19bcdbbddc9f4f3588ad72ade916bb2a42fb5d9aee0ba0","sha256:26359bb2b69d87216d601e0c623529937649808e4d8f7c1310c15670f574f5bf"],"state_sha256":"d89ddfbd7612ba22b956d34619ba0b75d69a44936d41aff985bc036223925acf"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"pHm/lW4Yt7syEJWQWm3NhI/s14GpaoALQGI20aNxbgjyMArjcnk5BLSaK+BJ5+4haOiopRbHTgGszaO9qv1uBA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-05T06:19:29.943376Z","bundle_sha256":"03ad06ed103da77e18165d594dbf43ced9040d49c81e81aa79362b315282d68b"}}