{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2025:O54EOVSE7QTFZ7XNAB6KRVDJ2K","short_pith_number":"pith:O54EOVSE","canonical_record":{"source":{"id":"2512.04458","kind":"arxiv","version":3},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2025-12-04T05:03:38Z","cross_cats_sorted":[],"title_canon_sha256":"13173407fa20db6ce3d67ab10191b2176c276cead241e34cf732ea4ee91148d7","abstract_canon_sha256":"b1724ac31fcef102110439cdd78f851d02faa2902b2777aa96603cb918cea808"},"schema_version":"1.0"},"canonical_sha256":"7778475644fc265cfeed007ca8d469d2859a8150362e0e9ffda1dabe7244bafe","source":{"kind":"arxiv","id":"2512.04458","version":3},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2512.04458","created_at":"2026-05-26T02:04:00Z"},{"alias_kind":"arxiv_version","alias_value":"2512.04458v3","created_at":"2026-05-26T02:04:00Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2512.04458","created_at":"2026-05-26T02:04:00Z"},{"alias_kind":"pith_short_12","alias_value":"O54EOVSE7QTF","created_at":"2026-05-26T02:04:00Z"},{"alias_kind":"pith_short_16","alias_value":"O54EOVSE7QTFZ7XN","created_at":"2026-05-26T02:04:00Z"},{"alias_kind":"pith_short_8","alias_value":"O54EOVSE","created_at":"2026-05-26T02:04:00Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2025:O54EOVSE7QTFZ7XNAB6KRVDJ2K","target":"record","payload":{"canonical_record":{"source":{"id":"2512.04458","kind":"arxiv","version":3},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2025-12-04T05:03:38Z","cross_cats_sorted":[],"title_canon_sha256":"13173407fa20db6ce3d67ab10191b2176c276cead241e34cf732ea4ee91148d7","abstract_canon_sha256":"b1724ac31fcef102110439cdd78f851d02faa2902b2777aa96603cb918cea808"},"schema_version":"1.0"},"canonical_sha256":"7778475644fc265cfeed007ca8d469d2859a8150362e0e9ffda1dabe7244bafe","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-26T02:04:00.472926Z","signature_b64":"bZOGdR8AWcnP0C9gAmy0T4YaabNlZjd39cdT+eQkfkBiig6quPYV9OSl6NDiAQVgF95AE1ZEy5dPWsfdNoPTAA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"7778475644fc265cfeed007ca8d469d2859a8150362e0e9ffda1dabe7244bafe","last_reissued_at":"2026-05-26T02:04:00.472095Z","signature_status":"signed_v1","first_computed_at":"2026-05-26T02:04:00.472095Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2512.04458","source_version":3,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-26T02:04:00Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"xOvqjsdprbAvoqMGkAKpGYTjxJh1wZy2TySF7wc/N2sYh9ZkHBBPwU9XGkWAvJCjFctZ0M3Wh3A+zZMruNkFBA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-31T17:32:22.092873Z"},"content_sha256":"e56244ad46a648b99bb3e72e06506ce6ea8c6067a82c28e4e3e0468862bb5855","schema_version":"1.0","event_id":"sha256:e56244ad46a648b99bb3e72e06506ce6ea8c6067a82c28e4e3e0468862bb5855"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2025:O54EOVSE7QTFZ7XNAB6KRVDJ2K","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"General spin models from noncollinear spin density functional theory and spin-cluster expansion","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"cond-mat.mtrl-sci","authors_text":"Tomonori Tanaka, Yoshihiro Gohda","submitted_at":"2025-12-04T05:03:38Z","abstract_excerpt":"We present a data-efficient framework for constructing general classical spin Hamiltonians by combining the spin-cluster expansion (SCE) with fully self-consistent noncollinear spin density functional theory (DFT). The key idea is to fit the SCE model to magnetic torques rather than to total energies. Because torques are site-resolved vectors, each spin configuration provides many informative regression targets, improving conditioning and substantially reducing the number of required DFT calculations, especially for large supercells. Applied to the B20-type chiral magnets ${\\rm Mn}_{1-x}{\\rm F"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2512.04458","kind":"arxiv","version":3},"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/2512.04458/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":"2026-05-26T02:04:00Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"8yyOQI1fSg7LN/gLa1y2RfWCu9xkeXQMp7+7Uysp+s02bKXftAex9W35+y4Rn1oO5I1vRcejKs94z8gcAh1ZBA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-31T17:32:22.093268Z"},"content_sha256":"cec7909fab1d04feea36dcc24f1bb253bf65ce6c196ba8951534a7b4882eb1ec","schema_version":"1.0","event_id":"sha256:cec7909fab1d04feea36dcc24f1bb253bf65ce6c196ba8951534a7b4882eb1ec"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/O54EOVSE7QTFZ7XNAB6KRVDJ2K/bundle.json","state_url":"https://pith.science/pith/O54EOVSE7QTFZ7XNAB6KRVDJ2K/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/O54EOVSE7QTFZ7XNAB6KRVDJ2K/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":"2026-05-31T17:32:22Z","links":{"resolver":"https://pith.science/pith/O54EOVSE7QTFZ7XNAB6KRVDJ2K","bundle":"https://pith.science/pith/O54EOVSE7QTFZ7XNAB6KRVDJ2K/bundle.json","state":"https://pith.science/pith/O54EOVSE7QTFZ7XNAB6KRVDJ2K/state.json","well_known_bundle":"https://pith.science/.well-known/pith/O54EOVSE7QTFZ7XNAB6KRVDJ2K/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2025:O54EOVSE7QTFZ7XNAB6KRVDJ2K","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":"b1724ac31fcef102110439cdd78f851d02faa2902b2777aa96603cb918cea808","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2025-12-04T05:03:38Z","title_canon_sha256":"13173407fa20db6ce3d67ab10191b2176c276cead241e34cf732ea4ee91148d7"},"schema_version":"1.0","source":{"id":"2512.04458","kind":"arxiv","version":3}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2512.04458","created_at":"2026-05-26T02:04:00Z"},{"alias_kind":"arxiv_version","alias_value":"2512.04458v3","created_at":"2026-05-26T02:04:00Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2512.04458","created_at":"2026-05-26T02:04:00Z"},{"alias_kind":"pith_short_12","alias_value":"O54EOVSE7QTF","created_at":"2026-05-26T02:04:00Z"},{"alias_kind":"pith_short_16","alias_value":"O54EOVSE7QTFZ7XN","created_at":"2026-05-26T02:04:00Z"},{"alias_kind":"pith_short_8","alias_value":"O54EOVSE","created_at":"2026-05-26T02:04:00Z"}],"graph_snapshots":[{"event_id":"sha256:cec7909fab1d04feea36dcc24f1bb253bf65ce6c196ba8951534a7b4882eb1ec","target":"graph","created_at":"2026-05-26T02:04:00Z","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/2512.04458/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"We present a data-efficient framework for constructing general classical spin Hamiltonians by combining the spin-cluster expansion (SCE) with fully self-consistent noncollinear spin density functional theory (DFT). The key idea is to fit the SCE model to magnetic torques rather than to total energies. Because torques are site-resolved vectors, each spin configuration provides many informative regression targets, improving conditioning and substantially reducing the number of required DFT calculations, especially for large supercells. Applied to the B20-type chiral magnets ${\\rm Mn}_{1-x}{\\rm F","authors_text":"Tomonori Tanaka, Yoshihiro Gohda","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2025-12-04T05:03:38Z","title":"General spin models from noncollinear spin density functional theory and spin-cluster expansion"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2512.04458","kind":"arxiv","version":3},"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:e56244ad46a648b99bb3e72e06506ce6ea8c6067a82c28e4e3e0468862bb5855","target":"record","created_at":"2026-05-26T02:04:00Z","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":"b1724ac31fcef102110439cdd78f851d02faa2902b2777aa96603cb918cea808","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2025-12-04T05:03:38Z","title_canon_sha256":"13173407fa20db6ce3d67ab10191b2176c276cead241e34cf732ea4ee91148d7"},"schema_version":"1.0","source":{"id":"2512.04458","kind":"arxiv","version":3}},"canonical_sha256":"7778475644fc265cfeed007ca8d469d2859a8150362e0e9ffda1dabe7244bafe","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"7778475644fc265cfeed007ca8d469d2859a8150362e0e9ffda1dabe7244bafe","first_computed_at":"2026-05-26T02:04:00.472095Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-26T02:04:00.472095Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"bZOGdR8AWcnP0C9gAmy0T4YaabNlZjd39cdT+eQkfkBiig6quPYV9OSl6NDiAQVgF95AE1ZEy5dPWsfdNoPTAA==","signature_status":"signed_v1","signed_at":"2026-05-26T02:04:00.472926Z","signed_message":"canonical_sha256_bytes"},"source_id":"2512.04458","source_kind":"arxiv","source_version":3}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:e56244ad46a648b99bb3e72e06506ce6ea8c6067a82c28e4e3e0468862bb5855","sha256:cec7909fab1d04feea36dcc24f1bb253bf65ce6c196ba8951534a7b4882eb1ec"],"state_sha256":"7e2b365ee531e0698e9ae072396c3cf66b707e751cf8f8ca44e754b217b71add"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"8pf/Qm/kvUMt7qne3E1jy6fZHuxaxAgdAhbrs+5O3405meV+H4NbdAhAabp+ubHygkEXPUcXBlAJWETyGeG/CQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-31T17:32:22.095609Z","bundle_sha256":"f8bf7ced235e2034bdea23d18f03dffb361b253f5ead0b7bb4840d4b95e2ba04"}}