{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2013:LUKUTEE3QZIVJQWY3BMEBJI2TI","short_pith_number":"pith:LUKUTEE3","canonical_record":{"source":{"id":"1302.0177","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2013-02-01T13:17:41Z","cross_cats_sorted":[],"title_canon_sha256":"1760f68cfec2611fea9f7929edc195b5c9e5b20ff511be756aaa04d2d1251a75","abstract_canon_sha256":"9efc7f8b3640d18ea3a5673748f567d039aa190a7c7d47489760aef294f9a80a"},"schema_version":"1.0"},"canonical_sha256":"5d1549909b865154c2d8d85840a51a9a2f6170eb48154da7393f624f83aaaca3","source":{"kind":"arxiv","id":"1302.0177","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1302.0177","created_at":"2026-05-18T01:51:51Z"},{"alias_kind":"arxiv_version","alias_value":"1302.0177v2","created_at":"2026-05-18T01:51:51Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1302.0177","created_at":"2026-05-18T01:51:51Z"},{"alias_kind":"pith_short_12","alias_value":"LUKUTEE3QZIV","created_at":"2026-05-18T12:27:51Z"},{"alias_kind":"pith_short_16","alias_value":"LUKUTEE3QZIVJQWY","created_at":"2026-05-18T12:27:51Z"},{"alias_kind":"pith_short_8","alias_value":"LUKUTEE3","created_at":"2026-05-18T12:27:51Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2013:LUKUTEE3QZIVJQWY3BMEBJI2TI","target":"record","payload":{"canonical_record":{"source":{"id":"1302.0177","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2013-02-01T13:17:41Z","cross_cats_sorted":[],"title_canon_sha256":"1760f68cfec2611fea9f7929edc195b5c9e5b20ff511be756aaa04d2d1251a75","abstract_canon_sha256":"9efc7f8b3640d18ea3a5673748f567d039aa190a7c7d47489760aef294f9a80a"},"schema_version":"1.0"},"canonical_sha256":"5d1549909b865154c2d8d85840a51a9a2f6170eb48154da7393f624f83aaaca3","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:51:51.410475Z","signature_b64":"jWURlZJWz9xYe4FZZtevwDHx9xoYxBVXaUF+JSC+o6+bnLhEVzx1LZ0R/fKS57j4HQgMmUIsT13IMZevPBZuBQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"5d1549909b865154c2d8d85840a51a9a2f6170eb48154da7393f624f83aaaca3","last_reissued_at":"2026-05-18T01:51:51.409891Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:51:51.409891Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1302.0177","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":"2026-05-18T01:51:51Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"W3z81ND08kcfIWEfWJ1exQRzvc9VQprLGdDJkLDcvVHioTgOkwg3YmPtYlRcs44AG/tVXlVEus8bymTu+0nOBA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-01T05:55:10.116965Z"},"content_sha256":"8ef1cd07c0b24c99f2e8e8e62da27b028975f0d436f188f51903aac1fcdcb795","schema_version":"1.0","event_id":"sha256:8ef1cd07c0b24c99f2e8e8e62da27b028975f0d436f188f51903aac1fcdcb795"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2013:LUKUTEE3QZIVJQWY3BMEBJI2TI","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Friction force microscopy: a simple technique for identifying graphene on rough substrates and mapping the orientation of graphene grains on copper","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"cond-mat.mtrl-sci","authors_text":"Alexander J. Marsden, Mick Phillips, Neil R. Wilson","submitted_at":"2013-02-01T13:17:41Z","abstract_excerpt":"At a single atom thick, it is challenging to distinguish graphene from its substrate using conventional techniques. In this paper we show that friction force microscopy (FFM) is a simple and quick technique for identifying graphene on a range of samples, from growth substrates to rough insulators. We show that FFM is particularly effective for characterising graphene grown on copper where it can correlate the graphene growth to the three-dimensional surface topography and map the crystallographic orientation of the graphene nondestructively, reproducibly and at high resolution. We expect FFM t"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1302.0177","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":"2026-05-18T01:51:51Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"JwcbT1WbCOBH/w5Z1dpLnDPejXVZe/o9ZBuYSQ9OKPFnTzjsuQg3o5FsOyn+WfGRMiZrStEbN7+ypXWZ7wlOBg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-01T05:55:10.117337Z"},"content_sha256":"326ffdb9e08f657d93766c936ff89476b2f798a270603922d70593616bf9388e","schema_version":"1.0","event_id":"sha256:326ffdb9e08f657d93766c936ff89476b2f798a270603922d70593616bf9388e"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/LUKUTEE3QZIVJQWY3BMEBJI2TI/bundle.json","state_url":"https://pith.science/pith/LUKUTEE3QZIVJQWY3BMEBJI2TI/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/LUKUTEE3QZIVJQWY3BMEBJI2TI/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":"2026-06-01T05:55:10Z","links":{"resolver":"https://pith.science/pith/LUKUTEE3QZIVJQWY3BMEBJI2TI","bundle":"https://pith.science/pith/LUKUTEE3QZIVJQWY3BMEBJI2TI/bundle.json","state":"https://pith.science/pith/LUKUTEE3QZIVJQWY3BMEBJI2TI/state.json","well_known_bundle":"https://pith.science/.well-known/pith/LUKUTEE3QZIVJQWY3BMEBJI2TI/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2013:LUKUTEE3QZIVJQWY3BMEBJI2TI","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":"9efc7f8b3640d18ea3a5673748f567d039aa190a7c7d47489760aef294f9a80a","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2013-02-01T13:17:41Z","title_canon_sha256":"1760f68cfec2611fea9f7929edc195b5c9e5b20ff511be756aaa04d2d1251a75"},"schema_version":"1.0","source":{"id":"1302.0177","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1302.0177","created_at":"2026-05-18T01:51:51Z"},{"alias_kind":"arxiv_version","alias_value":"1302.0177v2","created_at":"2026-05-18T01:51:51Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1302.0177","created_at":"2026-05-18T01:51:51Z"},{"alias_kind":"pith_short_12","alias_value":"LUKUTEE3QZIV","created_at":"2026-05-18T12:27:51Z"},{"alias_kind":"pith_short_16","alias_value":"LUKUTEE3QZIVJQWY","created_at":"2026-05-18T12:27:51Z"},{"alias_kind":"pith_short_8","alias_value":"LUKUTEE3","created_at":"2026-05-18T12:27:51Z"}],"graph_snapshots":[{"event_id":"sha256:326ffdb9e08f657d93766c936ff89476b2f798a270603922d70593616bf9388e","target":"graph","created_at":"2026-05-18T01:51:51Z","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":"At a single atom thick, it is challenging to distinguish graphene from its substrate using conventional techniques. In this paper we show that friction force microscopy (FFM) is a simple and quick technique for identifying graphene on a range of samples, from growth substrates to rough insulators. We show that FFM is particularly effective for characterising graphene grown on copper where it can correlate the graphene growth to the three-dimensional surface topography and map the crystallographic orientation of the graphene nondestructively, reproducibly and at high resolution. We expect FFM t","authors_text":"Alexander J. Marsden, Mick Phillips, Neil R. Wilson","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2013-02-01T13:17:41Z","title":"Friction force microscopy: a simple technique for identifying graphene on rough substrates and mapping the orientation of graphene grains on copper"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1302.0177","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":"sha256:8ef1cd07c0b24c99f2e8e8e62da27b028975f0d436f188f51903aac1fcdcb795","target":"record","created_at":"2026-05-18T01:51:51Z","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":"9efc7f8b3640d18ea3a5673748f567d039aa190a7c7d47489760aef294f9a80a","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2013-02-01T13:17:41Z","title_canon_sha256":"1760f68cfec2611fea9f7929edc195b5c9e5b20ff511be756aaa04d2d1251a75"},"schema_version":"1.0","source":{"id":"1302.0177","kind":"arxiv","version":2}},"canonical_sha256":"5d1549909b865154c2d8d85840a51a9a2f6170eb48154da7393f624f83aaaca3","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"5d1549909b865154c2d8d85840a51a9a2f6170eb48154da7393f624f83aaaca3","first_computed_at":"2026-05-18T01:51:51.409891Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:51:51.409891Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"jWURlZJWz9xYe4FZZtevwDHx9xoYxBVXaUF+JSC+o6+bnLhEVzx1LZ0R/fKS57j4HQgMmUIsT13IMZevPBZuBQ==","signature_status":"signed_v1","signed_at":"2026-05-18T01:51:51.410475Z","signed_message":"canonical_sha256_bytes"},"source_id":"1302.0177","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:8ef1cd07c0b24c99f2e8e8e62da27b028975f0d436f188f51903aac1fcdcb795","sha256:326ffdb9e08f657d93766c936ff89476b2f798a270603922d70593616bf9388e"],"state_sha256":"086fc8a25fb453c16015211d4d73bcfa9a2c13b126cdaba57afe78a01126291a"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"MEIrGYgKVyYk97Ut0peBzVbdX4Wl2zM0D/qDA6YIjpt5yikdxDrc3+I8Tu+SijB3EnP2Lc0QCK96OKuhkgMOCQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-01T05:55:10.119656Z","bundle_sha256":"6416cc2f83121cb8a60c53517525ce1215b5d3ac5cf85576cb1a2a8391503ae3"}}