{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2017:K6SIO3TIR62LT6PEVZBY57PS7C","short_pith_number":"pith:K6SIO3TI","canonical_record":{"source":{"id":"1702.04817","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2017-02-15T23:37:34Z","cross_cats_sorted":[],"title_canon_sha256":"e433b7a7c356c8b4cf78ef8f3697db8ca04e7b4ea4792d88e089970c7b82544a","abstract_canon_sha256":"7ab9ecf72ca407dc4aa55d5e169e8af39e0a9014ce2b137c34cba64b8b2c8c01"},"schema_version":"1.0"},"canonical_sha256":"57a4876e688fb4b9f9e4ae438efdf2f898539309b7b7cda718139eacb63512e8","source":{"kind":"arxiv","id":"1702.04817","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1702.04817","created_at":"2026-05-18T00:38:46Z"},{"alias_kind":"arxiv_version","alias_value":"1702.04817v2","created_at":"2026-05-18T00:38:46Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1702.04817","created_at":"2026-05-18T00:38:46Z"},{"alias_kind":"pith_short_12","alias_value":"K6SIO3TIR62L","created_at":"2026-05-18T12:31:24Z"},{"alias_kind":"pith_short_16","alias_value":"K6SIO3TIR62LT6PE","created_at":"2026-05-18T12:31:24Z"},{"alias_kind":"pith_short_8","alias_value":"K6SIO3TI","created_at":"2026-05-18T12:31:24Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2017:K6SIO3TIR62LT6PEVZBY57PS7C","target":"record","payload":{"canonical_record":{"source":{"id":"1702.04817","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2017-02-15T23:37:34Z","cross_cats_sorted":[],"title_canon_sha256":"e433b7a7c356c8b4cf78ef8f3697db8ca04e7b4ea4792d88e089970c7b82544a","abstract_canon_sha256":"7ab9ecf72ca407dc4aa55d5e169e8af39e0a9014ce2b137c34cba64b8b2c8c01"},"schema_version":"1.0"},"canonical_sha256":"57a4876e688fb4b9f9e4ae438efdf2f898539309b7b7cda718139eacb63512e8","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T00:38:46.240598Z","signature_b64":"QcuCDFahwLMIK7HLOOWQ9oTr6Id5FPvYz60f3d0Gnp0zbHyg4boZaHtJ/Hmfh4wy94xnboT6zH3gHXaVccVpDQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"57a4876e688fb4b9f9e4ae438efdf2f898539309b7b7cda718139eacb63512e8","last_reissued_at":"2026-05-18T00:38:46.240008Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T00:38:46.240008Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1702.04817","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":"2026-05-18T00:38:46Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"GL711QA+37a6L/DrV3+LhH84gMTQ3hM/utNy9ScDDXQcOMnhc9s3hqoYDSpXOKvaqtEyVB7zri+jcoAupNByCw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-01T06:48:17.856207Z"},"content_sha256":"9eeb90396251d540eb4a3171a82bfe55450ea03b80320c6112e6732269421a6e","schema_version":"1.0","event_id":"sha256:9eeb90396251d540eb4a3171a82bfe55450ea03b80320c6112e6732269421a6e"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2017:K6SIO3TIR62LT6PEVZBY57PS7C","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Comparative first-principles studies of prototypical ferroelectric materials by LDA, GGA, and SCAN meta-GGA","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"cond-mat.mtrl-sci","authors_text":"Jianwei Sun, John P. Perdew, Xifan Wu, Yubo Zhang","submitted_at":"2017-02-15T23:37:34Z","abstract_excerpt":"Originating from a broken spatial inversion symmetry, ferroelectricity is a functionality of materials with an electric dipole that can be switched by external electric fields. Spontaneous polarization is a crucial ferroelectric property, and its amplitude is determined by the strength of polar structural distortions. Density functional theory (DFT) is one of the most widely used theoretical methods to study ferroelectric properties, yet it is limited by the levels of approximations in electron exchange-correlation. On the one hand, the local density approximation (LDA) is considered to be mor"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1702.04817","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":"2026-05-18T00:38:46Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"fIYsZfYw0bsnhXvsiywDFhsQA3FcySQLfDgaHfFGhUwpqqUhGyqshbM70ntoA7oTCEk8UVA40c448CwmJzX5AQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-01T06:48:17.856585Z"},"content_sha256":"29e54f11a198219ee51ecac6fb939f24097af54be0b7dc4bc7c2c704eabb6e6d","schema_version":"1.0","event_id":"sha256:29e54f11a198219ee51ecac6fb939f24097af54be0b7dc4bc7c2c704eabb6e6d"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/K6SIO3TIR62LT6PEVZBY57PS7C/bundle.json","state_url":"https://pith.science/pith/K6SIO3TIR62LT6PEVZBY57PS7C/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/K6SIO3TIR62LT6PEVZBY57PS7C/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":"2026-06-01T06:48:17Z","links":{"resolver":"https://pith.science/pith/K6SIO3TIR62LT6PEVZBY57PS7C","bundle":"https://pith.science/pith/K6SIO3TIR62LT6PEVZBY57PS7C/bundle.json","state":"https://pith.science/pith/K6SIO3TIR62LT6PEVZBY57PS7C/state.json","well_known_bundle":"https://pith.science/.well-known/pith/K6SIO3TIR62LT6PEVZBY57PS7C/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2017:K6SIO3TIR62LT6PEVZBY57PS7C","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":"7ab9ecf72ca407dc4aa55d5e169e8af39e0a9014ce2b137c34cba64b8b2c8c01","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2017-02-15T23:37:34Z","title_canon_sha256":"e433b7a7c356c8b4cf78ef8f3697db8ca04e7b4ea4792d88e089970c7b82544a"},"schema_version":"1.0","source":{"id":"1702.04817","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1702.04817","created_at":"2026-05-18T00:38:46Z"},{"alias_kind":"arxiv_version","alias_value":"1702.04817v2","created_at":"2026-05-18T00:38:46Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1702.04817","created_at":"2026-05-18T00:38:46Z"},{"alias_kind":"pith_short_12","alias_value":"K6SIO3TIR62L","created_at":"2026-05-18T12:31:24Z"},{"alias_kind":"pith_short_16","alias_value":"K6SIO3TIR62LT6PE","created_at":"2026-05-18T12:31:24Z"},{"alias_kind":"pith_short_8","alias_value":"K6SIO3TI","created_at":"2026-05-18T12:31:24Z"}],"graph_snapshots":[{"event_id":"sha256:29e54f11a198219ee51ecac6fb939f24097af54be0b7dc4bc7c2c704eabb6e6d","target":"graph","created_at":"2026-05-18T00:38:46Z","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":"Originating from a broken spatial inversion symmetry, ferroelectricity is a functionality of materials with an electric dipole that can be switched by external electric fields. Spontaneous polarization is a crucial ferroelectric property, and its amplitude is determined by the strength of polar structural distortions. Density functional theory (DFT) is one of the most widely used theoretical methods to study ferroelectric properties, yet it is limited by the levels of approximations in electron exchange-correlation. On the one hand, the local density approximation (LDA) is considered to be mor","authors_text":"Jianwei Sun, John P. Perdew, Xifan Wu, Yubo Zhang","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2017-02-15T23:37:34Z","title":"Comparative first-principles studies of prototypical ferroelectric materials by LDA, GGA, and SCAN meta-GGA"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1702.04817","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":"sha256:9eeb90396251d540eb4a3171a82bfe55450ea03b80320c6112e6732269421a6e","target":"record","created_at":"2026-05-18T00:38:46Z","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":"7ab9ecf72ca407dc4aa55d5e169e8af39e0a9014ce2b137c34cba64b8b2c8c01","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2017-02-15T23:37:34Z","title_canon_sha256":"e433b7a7c356c8b4cf78ef8f3697db8ca04e7b4ea4792d88e089970c7b82544a"},"schema_version":"1.0","source":{"id":"1702.04817","kind":"arxiv","version":2}},"canonical_sha256":"57a4876e688fb4b9f9e4ae438efdf2f898539309b7b7cda718139eacb63512e8","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"57a4876e688fb4b9f9e4ae438efdf2f898539309b7b7cda718139eacb63512e8","first_computed_at":"2026-05-18T00:38:46.240008Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:38:46.240008Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"QcuCDFahwLMIK7HLOOWQ9oTr6Id5FPvYz60f3d0Gnp0zbHyg4boZaHtJ/Hmfh4wy94xnboT6zH3gHXaVccVpDQ==","signature_status":"signed_v1","signed_at":"2026-05-18T00:38:46.240598Z","signed_message":"canonical_sha256_bytes"},"source_id":"1702.04817","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:9eeb90396251d540eb4a3171a82bfe55450ea03b80320c6112e6732269421a6e","sha256:29e54f11a198219ee51ecac6fb939f24097af54be0b7dc4bc7c2c704eabb6e6d"],"state_sha256":"4f930e0121ddfcb3a6b0969a18624efe55c38a367b38acb959528477bf3e873a"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"0qLjgi/kGoA8zDyV8xA1ZxcZN7upNFm4IsM/g31k1u5WT2owPe+aU0pY2QfMueQR19ecSOoLBfBvQwdYdGxLCQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-01T06:48:17.859043Z","bundle_sha256":"adee77fbd463ac05f9dbdabc7ec5143009e0793dccddb982630d707cf3e5ded3"}}