{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2009:X3KERRMUARXNVIBWQLAIBRJIGM","short_pith_number":"pith:X3KERRMU","canonical_record":{"source":{"id":"0908.0659","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2009-08-05T19:39:47Z","cross_cats_sorted":[],"title_canon_sha256":"580401cabd3ba4a2b1c2e5d6922880d0616f768bdab4e62f426aab91a2ac0cea","abstract_canon_sha256":"8405010cd8eeed7c3b70774d4bc728f2728d939330acd71271fecad5dda6c212"},"schema_version":"1.0"},"canonical_sha256":"bed448c594046edaa03682c080c5283301e576ff034181c233c53f1a1e9a3f1f","source":{"kind":"arxiv","id":"0908.0659","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"0908.0659","created_at":"2026-05-18T02:12:44Z"},{"alias_kind":"arxiv_version","alias_value":"0908.0659v1","created_at":"2026-05-18T02:12:44Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.0908.0659","created_at":"2026-05-18T02:12:44Z"},{"alias_kind":"pith_short_12","alias_value":"X3KERRMUARXN","created_at":"2026-05-18T12:26:02Z"},{"alias_kind":"pith_short_16","alias_value":"X3KERRMUARXNVIBW","created_at":"2026-05-18T12:26:02Z"},{"alias_kind":"pith_short_8","alias_value":"X3KERRMU","created_at":"2026-05-18T12:26:02Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2009:X3KERRMUARXNVIBWQLAIBRJIGM","target":"record","payload":{"canonical_record":{"source":{"id":"0908.0659","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2009-08-05T19:39:47Z","cross_cats_sorted":[],"title_canon_sha256":"580401cabd3ba4a2b1c2e5d6922880d0616f768bdab4e62f426aab91a2ac0cea","abstract_canon_sha256":"8405010cd8eeed7c3b70774d4bc728f2728d939330acd71271fecad5dda6c212"},"schema_version":"1.0"},"canonical_sha256":"bed448c594046edaa03682c080c5283301e576ff034181c233c53f1a1e9a3f1f","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T02:12:44.432323Z","signature_b64":"f3Ex94Df+ydHFiSKVV2B/Q4EOIOAKo0XXfgCr9mEcE44K3GKg/mSLMX17qweFPo3hZxauS+Fq5OSe9gibbRyBw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"bed448c594046edaa03682c080c5283301e576ff034181c233c53f1a1e9a3f1f","last_reissued_at":"2026-05-18T02:12:44.431785Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T02:12:44.431785Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"0908.0659","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":"2026-05-18T02:12:44Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"xnmRMlwLy0nD7xNEG606g6S7hV/h2Id3mKemnVI2AXZ0cp+cQApifV2IUi7sARMNadZ7JaRgTW5BRqMrZU27BQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-23T17:23:20.207950Z"},"content_sha256":"afeafc7c994079c550a2a92b8afbf78a84e27d609fce1100d346236a32a66982","schema_version":"1.0","event_id":"sha256:afeafc7c994079c550a2a92b8afbf78a84e27d609fce1100d346236a32a66982"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2009:X3KERRMUARXNVIBWQLAIBRJIGM","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Building effective models from sparse but precise data","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"cond-mat.mtrl-sci","authors_text":"Axel van de Walle, Eric Cockayne","submitted_at":"2009-08-05T19:39:47Z","abstract_excerpt":"A common approach in computational science is to use a set of of highly precise but expensive calculations to parameterize a model that allows less precise, but more rapid calculations on larger scale systems. Least-squares fitting on a model that underfits the data is generally used for this purpose. For arbitrarily precise data free from statistic noise, e.g. ab initio calculations, we argue that it is more appropriate to begin with a ensemble of models that overfit the data. Within a Bayesian framework, a most likely model can be defined that incorporates physical knowledge, provides error "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0908.0659","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":"2026-05-18T02:12:44Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"409tX2enZu0ua+hkdVHMU+tZQM1Gt6mWbCcFGhva6C3K4HcMe/e7KFIUGeBSWM5U6jXkYUwLHWyd9TbygD3hCQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-23T17:23:20.208641Z"},"content_sha256":"7ea9547d9ab699ad090e9ff9b2f25853da3e4ed0ef45b978c0fd86400b56cbbe","schema_version":"1.0","event_id":"sha256:7ea9547d9ab699ad090e9ff9b2f25853da3e4ed0ef45b978c0fd86400b56cbbe"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/X3KERRMUARXNVIBWQLAIBRJIGM/bundle.json","state_url":"https://pith.science/pith/X3KERRMUARXNVIBWQLAIBRJIGM/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/X3KERRMUARXNVIBWQLAIBRJIGM/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":"2026-05-23T17:23:20Z","links":{"resolver":"https://pith.science/pith/X3KERRMUARXNVIBWQLAIBRJIGM","bundle":"https://pith.science/pith/X3KERRMUARXNVIBWQLAIBRJIGM/bundle.json","state":"https://pith.science/pith/X3KERRMUARXNVIBWQLAIBRJIGM/state.json","well_known_bundle":"https://pith.science/.well-known/pith/X3KERRMUARXNVIBWQLAIBRJIGM/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2009:X3KERRMUARXNVIBWQLAIBRJIGM","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":"8405010cd8eeed7c3b70774d4bc728f2728d939330acd71271fecad5dda6c212","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2009-08-05T19:39:47Z","title_canon_sha256":"580401cabd3ba4a2b1c2e5d6922880d0616f768bdab4e62f426aab91a2ac0cea"},"schema_version":"1.0","source":{"id":"0908.0659","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"0908.0659","created_at":"2026-05-18T02:12:44Z"},{"alias_kind":"arxiv_version","alias_value":"0908.0659v1","created_at":"2026-05-18T02:12:44Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.0908.0659","created_at":"2026-05-18T02:12:44Z"},{"alias_kind":"pith_short_12","alias_value":"X3KERRMUARXN","created_at":"2026-05-18T12:26:02Z"},{"alias_kind":"pith_short_16","alias_value":"X3KERRMUARXNVIBW","created_at":"2026-05-18T12:26:02Z"},{"alias_kind":"pith_short_8","alias_value":"X3KERRMU","created_at":"2026-05-18T12:26:02Z"}],"graph_snapshots":[{"event_id":"sha256:7ea9547d9ab699ad090e9ff9b2f25853da3e4ed0ef45b978c0fd86400b56cbbe","target":"graph","created_at":"2026-05-18T02:12:44Z","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":"A common approach in computational science is to use a set of of highly precise but expensive calculations to parameterize a model that allows less precise, but more rapid calculations on larger scale systems. Least-squares fitting on a model that underfits the data is generally used for this purpose. For arbitrarily precise data free from statistic noise, e.g. ab initio calculations, we argue that it is more appropriate to begin with a ensemble of models that overfit the data. Within a Bayesian framework, a most likely model can be defined that incorporates physical knowledge, provides error ","authors_text":"Axel van de Walle, Eric Cockayne","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2009-08-05T19:39:47Z","title":"Building effective models from sparse but precise data"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0908.0659","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:afeafc7c994079c550a2a92b8afbf78a84e27d609fce1100d346236a32a66982","target":"record","created_at":"2026-05-18T02:12:44Z","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":"8405010cd8eeed7c3b70774d4bc728f2728d939330acd71271fecad5dda6c212","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2009-08-05T19:39:47Z","title_canon_sha256":"580401cabd3ba4a2b1c2e5d6922880d0616f768bdab4e62f426aab91a2ac0cea"},"schema_version":"1.0","source":{"id":"0908.0659","kind":"arxiv","version":1}},"canonical_sha256":"bed448c594046edaa03682c080c5283301e576ff034181c233c53f1a1e9a3f1f","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"bed448c594046edaa03682c080c5283301e576ff034181c233c53f1a1e9a3f1f","first_computed_at":"2026-05-18T02:12:44.431785Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T02:12:44.431785Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"f3Ex94Df+ydHFiSKVV2B/Q4EOIOAKo0XXfgCr9mEcE44K3GKg/mSLMX17qweFPo3hZxauS+Fq5OSe9gibbRyBw==","signature_status":"signed_v1","signed_at":"2026-05-18T02:12:44.432323Z","signed_message":"canonical_sha256_bytes"},"source_id":"0908.0659","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:afeafc7c994079c550a2a92b8afbf78a84e27d609fce1100d346236a32a66982","sha256:7ea9547d9ab699ad090e9ff9b2f25853da3e4ed0ef45b978c0fd86400b56cbbe"],"state_sha256":"c84059a4fd06492293bbbbcbb2959a4e91a2c9b2db17165a63490829afb75fb6"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"twroioKlh74Q358wTv/E5MswqXg0cqxnnWoIwhokHmvCmGtIMxDCmA43KnX+7Qm6zewnE16FbQIoY29VVkitAQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-23T17:23:20.212797Z","bundle_sha256":"322b7f1bf44f9c6a6bb804bdfb7fa71c36ab58e5fca54d1eaac267b8fbe657be"}}