{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2018:ET5XQBXGMKB6MBFZAZLKHQCQJT","short_pith_number":"pith:ET5XQBXG","canonical_record":{"source":{"id":"1804.04836","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2018-04-13T08:34:38Z","cross_cats_sorted":[],"title_canon_sha256":"8ff6c91ce728cccc1d8c121bff54e682fb1de8468c20117f0164b3605c498dc3","abstract_canon_sha256":"0a6fb4a4544be482e754a7610535ee8756ada0cd0ced91d41f29d5ebe45f8b8e"},"schema_version":"1.0"},"canonical_sha256":"24fb7806e66283e604b90656a3c0504ce3967ebd58752476f45baf8fec6f292c","source":{"kind":"arxiv","id":"1804.04836","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1804.04836","created_at":"2026-05-18T00:18:34Z"},{"alias_kind":"arxiv_version","alias_value":"1804.04836v1","created_at":"2026-05-18T00:18:34Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1804.04836","created_at":"2026-05-18T00:18:34Z"},{"alias_kind":"pith_short_12","alias_value":"ET5XQBXGMKB6","created_at":"2026-05-18T12:32:22Z"},{"alias_kind":"pith_short_16","alias_value":"ET5XQBXGMKB6MBFZ","created_at":"2026-05-18T12:32:22Z"},{"alias_kind":"pith_short_8","alias_value":"ET5XQBXG","created_at":"2026-05-18T12:32:22Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2018:ET5XQBXGMKB6MBFZAZLKHQCQJT","target":"record","payload":{"canonical_record":{"source":{"id":"1804.04836","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2018-04-13T08:34:38Z","cross_cats_sorted":[],"title_canon_sha256":"8ff6c91ce728cccc1d8c121bff54e682fb1de8468c20117f0164b3605c498dc3","abstract_canon_sha256":"0a6fb4a4544be482e754a7610535ee8756ada0cd0ced91d41f29d5ebe45f8b8e"},"schema_version":"1.0"},"canonical_sha256":"24fb7806e66283e604b90656a3c0504ce3967ebd58752476f45baf8fec6f292c","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T00:18:34.820221Z","signature_b64":"yKYgEY8LAoAlAbeq/pHPo/DSbNUFxKYeF2sqPm70bLadI3C5UGlawhl998VAYUdkYsxz36PcYk+Dpzys5AWpBQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"24fb7806e66283e604b90656a3c0504ce3967ebd58752476f45baf8fec6f292c","last_reissued_at":"2026-05-18T00:18:34.819740Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T00:18:34.819740Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1804.04836","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":"2026-05-18T00:18:34Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"2UFf/KFAhlwlEgwlY+aMKZGbXUMuIqJjvt3Wd9dHGJx52oaxVsd6YtsU3iaoK1/Bm9rXlGfmXfDeoT0mKwPjDg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-28T19:20:54.842631Z"},"content_sha256":"97a4bf56f04a9221d3eaa5d59f7c4247dc4efed6e5b406b41543d23e9f21d29d","schema_version":"1.0","event_id":"sha256:97a4bf56f04a9221d3eaa5d59f7c4247dc4efed6e5b406b41543d23e9f21d29d"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2018:ET5XQBXGMKB6MBFZAZLKHQCQJT","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Subsurface Cation Vacancy Stabilization of the Magnetite (001) Surface","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"cond-mat.mtrl-sci","authors_text":"E. McDermott, G.S. Parkinson, J. Pavelec, L. Hammer, M. A. Schneider, M. Schmid, M. Setvin, O. Gamba, P. Blaha, P. Ferstl, R. Bliem, U. Diebold","submitted_at":"2018-04-13T08:34:38Z","abstract_excerpt":"Iron oxides play an increasingly prominent role in heterogeneous catalysis, hydrogen production, spintronics and drug delivery. The surface or material interface can be performance limiting in these applications, so it is vital to determine accurate atomic-scale structures for iron oxides and understand why they form. Using a combination of quantitative low-energy electron diffraction, scanning tunneling microscopy, and density functional theory calculations, we show that an ordered array of subsurface iron vacancies and interstitials underlies the well-known (rt2xrt2)R45{\\deg} reconstruction "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1804.04836","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":"2026-05-18T00:18:34Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"db47mUCGHU1bRIFtsHHUa/6hE7++VLC07WwrYrYylKqTak7xLyipdGuHNPlUmMNUjowvmv2Wvh9PrWmsRKneDA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-28T19:20:54.842998Z"},"content_sha256":"9bf68948c47c908e942b514a5819962cfd9776564c4d6ae0e9c231dccb4c211e","schema_version":"1.0","event_id":"sha256:9bf68948c47c908e942b514a5819962cfd9776564c4d6ae0e9c231dccb4c211e"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/ET5XQBXGMKB6MBFZAZLKHQCQJT/bundle.json","state_url":"https://pith.science/pith/ET5XQBXGMKB6MBFZAZLKHQCQJT/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/ET5XQBXGMKB6MBFZAZLKHQCQJT/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":"2026-05-28T19:20:54Z","links":{"resolver":"https://pith.science/pith/ET5XQBXGMKB6MBFZAZLKHQCQJT","bundle":"https://pith.science/pith/ET5XQBXGMKB6MBFZAZLKHQCQJT/bundle.json","state":"https://pith.science/pith/ET5XQBXGMKB6MBFZAZLKHQCQJT/state.json","well_known_bundle":"https://pith.science/.well-known/pith/ET5XQBXGMKB6MBFZAZLKHQCQJT/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2018:ET5XQBXGMKB6MBFZAZLKHQCQJT","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":"0a6fb4a4544be482e754a7610535ee8756ada0cd0ced91d41f29d5ebe45f8b8e","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2018-04-13T08:34:38Z","title_canon_sha256":"8ff6c91ce728cccc1d8c121bff54e682fb1de8468c20117f0164b3605c498dc3"},"schema_version":"1.0","source":{"id":"1804.04836","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1804.04836","created_at":"2026-05-18T00:18:34Z"},{"alias_kind":"arxiv_version","alias_value":"1804.04836v1","created_at":"2026-05-18T00:18:34Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1804.04836","created_at":"2026-05-18T00:18:34Z"},{"alias_kind":"pith_short_12","alias_value":"ET5XQBXGMKB6","created_at":"2026-05-18T12:32:22Z"},{"alias_kind":"pith_short_16","alias_value":"ET5XQBXGMKB6MBFZ","created_at":"2026-05-18T12:32:22Z"},{"alias_kind":"pith_short_8","alias_value":"ET5XQBXG","created_at":"2026-05-18T12:32:22Z"}],"graph_snapshots":[{"event_id":"sha256:9bf68948c47c908e942b514a5819962cfd9776564c4d6ae0e9c231dccb4c211e","target":"graph","created_at":"2026-05-18T00:18:34Z","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":"Iron oxides play an increasingly prominent role in heterogeneous catalysis, hydrogen production, spintronics and drug delivery. The surface or material interface can be performance limiting in these applications, so it is vital to determine accurate atomic-scale structures for iron oxides and understand why they form. Using a combination of quantitative low-energy electron diffraction, scanning tunneling microscopy, and density functional theory calculations, we show that an ordered array of subsurface iron vacancies and interstitials underlies the well-known (rt2xrt2)R45{\\deg} reconstruction ","authors_text":"E. McDermott, G.S. Parkinson, J. Pavelec, L. Hammer, M. A. Schneider, M. Schmid, M. Setvin, O. Gamba, P. Blaha, P. Ferstl, R. Bliem, U. Diebold","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2018-04-13T08:34:38Z","title":"Subsurface Cation Vacancy Stabilization of the Magnetite (001) Surface"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1804.04836","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":"sha256:97a4bf56f04a9221d3eaa5d59f7c4247dc4efed6e5b406b41543d23e9f21d29d","target":"record","created_at":"2026-05-18T00:18:34Z","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":"0a6fb4a4544be482e754a7610535ee8756ada0cd0ced91d41f29d5ebe45f8b8e","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2018-04-13T08:34:38Z","title_canon_sha256":"8ff6c91ce728cccc1d8c121bff54e682fb1de8468c20117f0164b3605c498dc3"},"schema_version":"1.0","source":{"id":"1804.04836","kind":"arxiv","version":1}},"canonical_sha256":"24fb7806e66283e604b90656a3c0504ce3967ebd58752476f45baf8fec6f292c","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"24fb7806e66283e604b90656a3c0504ce3967ebd58752476f45baf8fec6f292c","first_computed_at":"2026-05-18T00:18:34.819740Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:18:34.819740Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"yKYgEY8LAoAlAbeq/pHPo/DSbNUFxKYeF2sqPm70bLadI3C5UGlawhl998VAYUdkYsxz36PcYk+Dpzys5AWpBQ==","signature_status":"signed_v1","signed_at":"2026-05-18T00:18:34.820221Z","signed_message":"canonical_sha256_bytes"},"source_id":"1804.04836","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:97a4bf56f04a9221d3eaa5d59f7c4247dc4efed6e5b406b41543d23e9f21d29d","sha256:9bf68948c47c908e942b514a5819962cfd9776564c4d6ae0e9c231dccb4c211e"],"state_sha256":"09415b0c0f033961c2427e62a2f79cef685c107b1fd495fb824e6fe9b39d2b6d"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"k4MlhQXyXk6nKOo6aKaB5pUU9aymk7uoypsr/WpDrwxujeseNe/DMO2cMGhGprVeJ5TpXM0i+pk3OBb9W7KaBw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-28T19:20:54.845159Z","bundle_sha256":"afefe05e5c904fa56f550453fbbed0364dc98eeee8738ed55f6dbe62a88ab683"}}