{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2009:AY4UEC7QEOAA2S4URZECJB5I34","short_pith_number":"pith:AY4UEC7Q","canonical_record":{"source":{"id":"0908.4517","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2009-08-31T12:23:28Z","cross_cats_sorted":[],"title_canon_sha256":"dac4ac82acde5d30aae43647736ea0ce53d4c57c02184b2b15619eb116d8e4f9","abstract_canon_sha256":"859f0a4048b0beab57741bd7301f39c900370ff09083581a1e84e929c2a3d2ed"},"schema_version":"1.0"},"canonical_sha256":"0639420bf023800d4b948e482487a8df3ff9796658ea3cf2e32e092aad71b4d6","source":{"kind":"arxiv","id":"0908.4517","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"0908.4517","created_at":"2026-05-18T02:12:12Z"},{"alias_kind":"arxiv_version","alias_value":"0908.4517v2","created_at":"2026-05-18T02:12:12Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.0908.4517","created_at":"2026-05-18T02:12:12Z"},{"alias_kind":"pith_short_12","alias_value":"AY4UEC7QEOAA","created_at":"2026-05-18T12:25:58Z"},{"alias_kind":"pith_short_16","alias_value":"AY4UEC7QEOAA2S4U","created_at":"2026-05-18T12:25:58Z"},{"alias_kind":"pith_short_8","alias_value":"AY4UEC7Q","created_at":"2026-05-18T12:25:58Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2009:AY4UEC7QEOAA2S4URZECJB5I34","target":"record","payload":{"canonical_record":{"source":{"id":"0908.4517","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2009-08-31T12:23:28Z","cross_cats_sorted":[],"title_canon_sha256":"dac4ac82acde5d30aae43647736ea0ce53d4c57c02184b2b15619eb116d8e4f9","abstract_canon_sha256":"859f0a4048b0beab57741bd7301f39c900370ff09083581a1e84e929c2a3d2ed"},"schema_version":"1.0"},"canonical_sha256":"0639420bf023800d4b948e482487a8df3ff9796658ea3cf2e32e092aad71b4d6","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T02:12:12.710821Z","signature_b64":"0Hx27rsrCEuLNA44k90YH/gtAkha4rbPIY5wpLiB7BbBRbb7f5wgn0+QRVbq+eakkTACN/bxteh/KrcKUL/WAg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"0639420bf023800d4b948e482487a8df3ff9796658ea3cf2e32e092aad71b4d6","last_reissued_at":"2026-05-18T02:12:12.709891Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T02:12:12.709891Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"0908.4517","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":"2026-05-18T02:12:12Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"fjyDf+y3xS09DDHrPBxaNNmHjFNDgwrSMMPzEBlySBOiDeE4M+ZQzOC9YdMzRbvtmLLt+gkz6TFn/a7ED5PgCw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-28T20:04:44.418882Z"},"content_sha256":"787bfcea442c3db2ea3605250e4a69fc4558ae2e5d0a156dc3ded3f780d0811e","schema_version":"1.0","event_id":"sha256:787bfcea442c3db2ea3605250e4a69fc4558ae2e5d0a156dc3ded3f780d0811e"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2009:AY4UEC7QEOAA2S4URZECJB5I34","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Graphene on Ru(0001): A corrugated and chiral structure","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"cond-mat.mtrl-sci","authors_text":"B.D. Patterson, C.M. Schlepuetz, D. Martoccia, M. Bjoerck, P.R. Willmott, S.A. Pauli, T. Brugger, T. Greber","submitted_at":"2009-08-31T12:23:28Z","abstract_excerpt":"We present a structural analysis of the graphene/Ru(0001) system obtained by surface x-ray diffraction. The data were fit using Fourier-series expanded displacement fields from an ideal bulk structure, plus the application of symmetry constraints. The shape of the observed superstructure rods proves a reconstruction of the substrate, induced by strong bonding of graphene to ruthenium. Both the graphene layer and the underlying substrate are corrugated, with peak-to-peak heights of (0.82 +/- 0.15) A and (0.19 +/- 0.02) A for the graphene and topmost Ru-atomic layer, respectively. The Ru-corruga"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0908.4517","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":"2026-05-18T02:12:12Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"3ZZg2zTcnTjH1Fgfx75yU8mvKqftdlaobZawZtJdduaIq1Gum9b6ZKit9E0o5mVRxe7zTqjfsLvLKvzevZ/SAA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-28T20:04:44.419449Z"},"content_sha256":"b62a187f66e78c97d115d819c5b715b1b48b5deafb9b55e6f560b5e8cf185ec2","schema_version":"1.0","event_id":"sha256:b62a187f66e78c97d115d819c5b715b1b48b5deafb9b55e6f560b5e8cf185ec2"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/AY4UEC7QEOAA2S4URZECJB5I34/bundle.json","state_url":"https://pith.science/pith/AY4UEC7QEOAA2S4URZECJB5I34/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/AY4UEC7QEOAA2S4URZECJB5I34/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":"2026-05-28T20:04:44Z","links":{"resolver":"https://pith.science/pith/AY4UEC7QEOAA2S4URZECJB5I34","bundle":"https://pith.science/pith/AY4UEC7QEOAA2S4URZECJB5I34/bundle.json","state":"https://pith.science/pith/AY4UEC7QEOAA2S4URZECJB5I34/state.json","well_known_bundle":"https://pith.science/.well-known/pith/AY4UEC7QEOAA2S4URZECJB5I34/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2009:AY4UEC7QEOAA2S4URZECJB5I34","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":"859f0a4048b0beab57741bd7301f39c900370ff09083581a1e84e929c2a3d2ed","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2009-08-31T12:23:28Z","title_canon_sha256":"dac4ac82acde5d30aae43647736ea0ce53d4c57c02184b2b15619eb116d8e4f9"},"schema_version":"1.0","source":{"id":"0908.4517","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"0908.4517","created_at":"2026-05-18T02:12:12Z"},{"alias_kind":"arxiv_version","alias_value":"0908.4517v2","created_at":"2026-05-18T02:12:12Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.0908.4517","created_at":"2026-05-18T02:12:12Z"},{"alias_kind":"pith_short_12","alias_value":"AY4UEC7QEOAA","created_at":"2026-05-18T12:25:58Z"},{"alias_kind":"pith_short_16","alias_value":"AY4UEC7QEOAA2S4U","created_at":"2026-05-18T12:25:58Z"},{"alias_kind":"pith_short_8","alias_value":"AY4UEC7Q","created_at":"2026-05-18T12:25:58Z"}],"graph_snapshots":[{"event_id":"sha256:b62a187f66e78c97d115d819c5b715b1b48b5deafb9b55e6f560b5e8cf185ec2","target":"graph","created_at":"2026-05-18T02:12:12Z","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":"We present a structural analysis of the graphene/Ru(0001) system obtained by surface x-ray diffraction. The data were fit using Fourier-series expanded displacement fields from an ideal bulk structure, plus the application of symmetry constraints. The shape of the observed superstructure rods proves a reconstruction of the substrate, induced by strong bonding of graphene to ruthenium. Both the graphene layer and the underlying substrate are corrugated, with peak-to-peak heights of (0.82 +/- 0.15) A and (0.19 +/- 0.02) A for the graphene and topmost Ru-atomic layer, respectively. The Ru-corruga","authors_text":"B.D. Patterson, C.M. Schlepuetz, D. Martoccia, M. Bjoerck, P.R. Willmott, S.A. Pauli, T. Brugger, T. Greber","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2009-08-31T12:23:28Z","title":"Graphene on Ru(0001): A corrugated and chiral structure"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0908.4517","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":"sha256:787bfcea442c3db2ea3605250e4a69fc4558ae2e5d0a156dc3ded3f780d0811e","target":"record","created_at":"2026-05-18T02:12:12Z","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":"859f0a4048b0beab57741bd7301f39c900370ff09083581a1e84e929c2a3d2ed","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2009-08-31T12:23:28Z","title_canon_sha256":"dac4ac82acde5d30aae43647736ea0ce53d4c57c02184b2b15619eb116d8e4f9"},"schema_version":"1.0","source":{"id":"0908.4517","kind":"arxiv","version":2}},"canonical_sha256":"0639420bf023800d4b948e482487a8df3ff9796658ea3cf2e32e092aad71b4d6","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"0639420bf023800d4b948e482487a8df3ff9796658ea3cf2e32e092aad71b4d6","first_computed_at":"2026-05-18T02:12:12.709891Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T02:12:12.709891Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"0Hx27rsrCEuLNA44k90YH/gtAkha4rbPIY5wpLiB7BbBRbb7f5wgn0+QRVbq+eakkTACN/bxteh/KrcKUL/WAg==","signature_status":"signed_v1","signed_at":"2026-05-18T02:12:12.710821Z","signed_message":"canonical_sha256_bytes"},"source_id":"0908.4517","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:787bfcea442c3db2ea3605250e4a69fc4558ae2e5d0a156dc3ded3f780d0811e","sha256:b62a187f66e78c97d115d819c5b715b1b48b5deafb9b55e6f560b5e8cf185ec2"],"state_sha256":"6e8a8f8cc393612348702dbc6ac1facfdcffd1431b3221e50789ece092cac330"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"/XgkWxveNbE9u2gAoxqomW8+HFUiRjVDBB1/8JBWFooC/Dqkgwi6JflzB28UT1mwlOMRPWermTDLaAYFVfsFCw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-28T20:04:44.422562Z","bundle_sha256":"75d1855841b800ffc9ce4cdee37e5ad3bf9c2cfb437dbfa6ebcc160cd5b73bfe"}}