{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2018:YEGMOFKVHYKSF3QDOEN2FRODB5","short_pith_number":"pith:YEGMOFKV","canonical_record":{"source":{"id":"1804.04926","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2018-04-13T13:05:50Z","cross_cats_sorted":[],"title_canon_sha256":"8dab9fc2392f9b16637ae51c39901950db1c4ff09bec421c85908b44d81ac93f","abstract_canon_sha256":"2d9360aa031c7089134e6fa7389604602d45cdfecf8f3e2ea67196b3663b2f15"},"schema_version":"1.0"},"canonical_sha256":"c10cc715553e1522ee03711ba2c5c30f6691a59eb2235c4a98743b7d2c85bcce","source":{"kind":"arxiv","id":"1804.04926","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1804.04926","created_at":"2026-05-18T00:18:32Z"},{"alias_kind":"arxiv_version","alias_value":"1804.04926v1","created_at":"2026-05-18T00:18:32Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1804.04926","created_at":"2026-05-18T00:18:32Z"},{"alias_kind":"pith_short_12","alias_value":"YEGMOFKVHYKS","created_at":"2026-05-18T12:33:04Z"},{"alias_kind":"pith_short_16","alias_value":"YEGMOFKVHYKSF3QD","created_at":"2026-05-18T12:33:04Z"},{"alias_kind":"pith_short_8","alias_value":"YEGMOFKV","created_at":"2026-05-18T12:33:04Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2018:YEGMOFKVHYKSF3QDOEN2FRODB5","target":"record","payload":{"canonical_record":{"source":{"id":"1804.04926","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2018-04-13T13:05:50Z","cross_cats_sorted":[],"title_canon_sha256":"8dab9fc2392f9b16637ae51c39901950db1c4ff09bec421c85908b44d81ac93f","abstract_canon_sha256":"2d9360aa031c7089134e6fa7389604602d45cdfecf8f3e2ea67196b3663b2f15"},"schema_version":"1.0"},"canonical_sha256":"c10cc715553e1522ee03711ba2c5c30f6691a59eb2235c4a98743b7d2c85bcce","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T00:18:32.640715Z","signature_b64":"tVlAHhFuQY3bZNYfO3OU/jeB/CeQY6qgI9CayTGOTjBTf3UqNus7Ri7uMgp8auJaRe3MEFLkgaYvrlMYrRc5Bw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"c10cc715553e1522ee03711ba2c5c30f6691a59eb2235c4a98743b7d2c85bcce","last_reissued_at":"2026-05-18T00:18:32.640300Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T00:18:32.640300Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1804.04926","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":"2026-05-18T00:18:32Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"wgTVIqH/UjyGZQNp/sJxv5XeA47jnLXGTNTXYBYpoShVffKv9c19S4BHTdlYqociGVWv1auMIsSFhEKaOwWdCw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-30T11:46:37.716197Z"},"content_sha256":"ce5ffd30247f72374f96b3e8a9c6c049cf26cae2e5be228f495468aac05b4594","schema_version":"1.0","event_id":"sha256:ce5ffd30247f72374f96b3e8a9c6c049cf26cae2e5be228f495468aac05b4594"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2018:YEGMOFKVHYKSF3QDOEN2FRODB5","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Reaction of O2 with Subsurface Oxygen Vacancies on TiO2 Anatase (101)","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"cond-mat.mtrl-sci","authors_text":"Annabella Selloni, Martin Setvin, Michael Schmid, Philipp Scheiber, Ulrich Aschauer, Ulrike Diebold, Weiyi Hou, Ye-Fei Li","submitted_at":"2018-04-13T13:05:50Z","abstract_excerpt":"Oxygen (O2) adsorbed on metal oxides is important in catalytic oxidation reactions, chemical sensing, and photocatalysis. Strong adsorption requires transfer of negative charge from oxygen vacancies (VOs) or dopants, for example. With scanning tunneling microscopy, we observed, transformed, and, in conjunction with theory, identified the nature of O2 molecules on the (101) surface of anatase (titanium oxide, TiO2) doped with niobium. VOs reside exclusively in the bulk, but we pull them to the surface with a strongly negatively charged scanning tunneling microscope tip. O2 adsorbed as superoxo "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1804.04926","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":"2026-05-18T00:18:32Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"kK5c+KNrJ6oYXRcNybEug+7iMRuaxSV41+insTIpCxk05Sk7uGrNIOCStujfJGNFAHxQoX0PoKh7YV4RPhw/Dg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-30T11:46:37.716906Z"},"content_sha256":"742a9401c9362946f0818ab8634bbbfb30a3b37e8cd869f59e5a61ca84c8c949","schema_version":"1.0","event_id":"sha256:742a9401c9362946f0818ab8634bbbfb30a3b37e8cd869f59e5a61ca84c8c949"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/YEGMOFKVHYKSF3QDOEN2FRODB5/bundle.json","state_url":"https://pith.science/pith/YEGMOFKVHYKSF3QDOEN2FRODB5/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/YEGMOFKVHYKSF3QDOEN2FRODB5/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":"2026-05-30T11:46:37Z","links":{"resolver":"https://pith.science/pith/YEGMOFKVHYKSF3QDOEN2FRODB5","bundle":"https://pith.science/pith/YEGMOFKVHYKSF3QDOEN2FRODB5/bundle.json","state":"https://pith.science/pith/YEGMOFKVHYKSF3QDOEN2FRODB5/state.json","well_known_bundle":"https://pith.science/.well-known/pith/YEGMOFKVHYKSF3QDOEN2FRODB5/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2018:YEGMOFKVHYKSF3QDOEN2FRODB5","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":"2d9360aa031c7089134e6fa7389604602d45cdfecf8f3e2ea67196b3663b2f15","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2018-04-13T13:05:50Z","title_canon_sha256":"8dab9fc2392f9b16637ae51c39901950db1c4ff09bec421c85908b44d81ac93f"},"schema_version":"1.0","source":{"id":"1804.04926","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1804.04926","created_at":"2026-05-18T00:18:32Z"},{"alias_kind":"arxiv_version","alias_value":"1804.04926v1","created_at":"2026-05-18T00:18:32Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1804.04926","created_at":"2026-05-18T00:18:32Z"},{"alias_kind":"pith_short_12","alias_value":"YEGMOFKVHYKS","created_at":"2026-05-18T12:33:04Z"},{"alias_kind":"pith_short_16","alias_value":"YEGMOFKVHYKSF3QD","created_at":"2026-05-18T12:33:04Z"},{"alias_kind":"pith_short_8","alias_value":"YEGMOFKV","created_at":"2026-05-18T12:33:04Z"}],"graph_snapshots":[{"event_id":"sha256:742a9401c9362946f0818ab8634bbbfb30a3b37e8cd869f59e5a61ca84c8c949","target":"graph","created_at":"2026-05-18T00:18:32Z","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":"Oxygen (O2) adsorbed on metal oxides is important in catalytic oxidation reactions, chemical sensing, and photocatalysis. Strong adsorption requires transfer of negative charge from oxygen vacancies (VOs) or dopants, for example. With scanning tunneling microscopy, we observed, transformed, and, in conjunction with theory, identified the nature of O2 molecules on the (101) surface of anatase (titanium oxide, TiO2) doped with niobium. VOs reside exclusively in the bulk, but we pull them to the surface with a strongly negatively charged scanning tunneling microscope tip. O2 adsorbed as superoxo ","authors_text":"Annabella Selloni, Martin Setvin, Michael Schmid, Philipp Scheiber, Ulrich Aschauer, Ulrike Diebold, Weiyi Hou, Ye-Fei Li","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2018-04-13T13:05:50Z","title":"Reaction of O2 with Subsurface Oxygen Vacancies on TiO2 Anatase (101)"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1804.04926","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:ce5ffd30247f72374f96b3e8a9c6c049cf26cae2e5be228f495468aac05b4594","target":"record","created_at":"2026-05-18T00:18:32Z","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":"2d9360aa031c7089134e6fa7389604602d45cdfecf8f3e2ea67196b3663b2f15","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2018-04-13T13:05:50Z","title_canon_sha256":"8dab9fc2392f9b16637ae51c39901950db1c4ff09bec421c85908b44d81ac93f"},"schema_version":"1.0","source":{"id":"1804.04926","kind":"arxiv","version":1}},"canonical_sha256":"c10cc715553e1522ee03711ba2c5c30f6691a59eb2235c4a98743b7d2c85bcce","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"c10cc715553e1522ee03711ba2c5c30f6691a59eb2235c4a98743b7d2c85bcce","first_computed_at":"2026-05-18T00:18:32.640300Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:18:32.640300Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"tVlAHhFuQY3bZNYfO3OU/jeB/CeQY6qgI9CayTGOTjBTf3UqNus7Ri7uMgp8auJaRe3MEFLkgaYvrlMYrRc5Bw==","signature_status":"signed_v1","signed_at":"2026-05-18T00:18:32.640715Z","signed_message":"canonical_sha256_bytes"},"source_id":"1804.04926","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:ce5ffd30247f72374f96b3e8a9c6c049cf26cae2e5be228f495468aac05b4594","sha256:742a9401c9362946f0818ab8634bbbfb30a3b37e8cd869f59e5a61ca84c8c949"],"state_sha256":"2eb52e02bb962c15e46de02aaa774518cc4cf4308a45876ebc4461bb1fc567b5"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"3AKsELWSbldeOh0K8W3B2/mMebhbojYnd0nA6p9Xnag5peJgf2G+aFF93yRy6N7t3298Au3QqabyooVL90wsAQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-30T11:46:37.720641Z","bundle_sha256":"7820173d987bd2569cf70e4c2049c39a5df1de0f4ab79d7280bf390cadcaee74"}}