{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2020:4HQGPWNEOYWAWRUXZ6EVVFHWNL","short_pith_number":"pith:4HQGPWNE","canonical_record":{"source":{"id":"2012.00491","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2020-12-01T13:57:15Z","cross_cats_sorted":[],"title_canon_sha256":"f05b6e8f4f4db6dacc60c4d770bec936b51c56dbda71c3f4d649e594d2b5d29d","abstract_canon_sha256":"b521b4b34020cf26fb7bda7bc2558c32a71aef49b696f6c9bdafce612a6e6e09"},"schema_version":"1.0"},"canonical_sha256":"e1e067d9a4762c0b4697cf895a94f66ac4b51f8a8e2ad46b7a2cc2e01670cd8c","source":{"kind":"arxiv","id":"2012.00491","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2012.00491","created_at":"2026-07-05T01:56:17Z"},{"alias_kind":"arxiv_version","alias_value":"2012.00491v1","created_at":"2026-07-05T01:56:17Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2012.00491","created_at":"2026-07-05T01:56:17Z"},{"alias_kind":"pith_short_12","alias_value":"4HQGPWNEOYWA","created_at":"2026-07-05T01:56:17Z"},{"alias_kind":"pith_short_16","alias_value":"4HQGPWNEOYWAWRUX","created_at":"2026-07-05T01:56:17Z"},{"alias_kind":"pith_short_8","alias_value":"4HQGPWNE","created_at":"2026-07-05T01:56:17Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2020:4HQGPWNEOYWAWRUXZ6EVVFHWNL","target":"record","payload":{"canonical_record":{"source":{"id":"2012.00491","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2020-12-01T13:57:15Z","cross_cats_sorted":[],"title_canon_sha256":"f05b6e8f4f4db6dacc60c4d770bec936b51c56dbda71c3f4d649e594d2b5d29d","abstract_canon_sha256":"b521b4b34020cf26fb7bda7bc2558c32a71aef49b696f6c9bdafce612a6e6e09"},"schema_version":"1.0"},"canonical_sha256":"e1e067d9a4762c0b4697cf895a94f66ac4b51f8a8e2ad46b7a2cc2e01670cd8c","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T01:56:17.043796Z","signature_b64":"WPLqmmhwwZKncjfjMJqEs75OEq6llJtl6rhYM1GaQx7WIA9iHdzmSqkFFa84bjg91YEMWNePKib8dvrsENIsAA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"e1e067d9a4762c0b4697cf895a94f66ac4b51f8a8e2ad46b7a2cc2e01670cd8c","last_reissued_at":"2026-07-05T01:56:17.043351Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T01:56:17.043351Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2012.00491","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":"2026-07-05T01:56:17Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"GZnLc57f2oj0L3TWZmj9gUrv2wItLjPXrOOumDeXs0u/nk8i/X7OVjCysLqJRyQxZbRUO4O2yH8cfJrr+GFJBQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-09T00:15:09.146578Z"},"content_sha256":"896ec6ad8825773a5429151233f6565d0ea4e661b29810f2ac74adb587f0603d","schema_version":"1.0","event_id":"sha256:896ec6ad8825773a5429151233f6565d0ea4e661b29810f2ac74adb587f0603d"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2020:4HQGPWNEOYWAWRUXZ6EVVFHWNL","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Substrate-Independent Growth of Atomically Precise Chiral Graphene Nanoribbons","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"cond-mat.mtrl-sci","authors_text":"Aran Garcia-Lekue, Celia Rogero, Diego Pe\\~na, Dimas G. de Oteyza, Eduard Carbonell-Sanrom\\`a, Enrique Guitian, Guillaume Vasseur, J. Enrique Ortega, Jose Ignacio Pascua, Manuel Vilas-Varela, Martina Corso, Nestor Merino, Yutaka Wakayama","submitted_at":"2020-12-01T13:57:15Z","abstract_excerpt":"Contributing to the need of new graphene nanoribbon (GNR) structures that can be synthesized with atomic precision, we have designed a reactant that renders chiral (3,1) - GNRs after a multi-step reaction including Ullmann coupling and cyclodehydrogenation. The nanoribbon synthesis has been successfully proved on different coinage metals, and the formation process, together with the fingerprints associated to each reaction step, has been studied combining scanning tunnelling microscopy, core-level spectroscopy and density functional calculations. In addition to the GNR chiral edge structure, t"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2012.00491","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":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/2012.00491/integrity.json","findings":[],"available":true,"detectors_run":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938"},"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":"2026-07-05T01:56:17Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"bKxoLn+yvYAw+1yU0EXTzWLnH+PqPtxYUSEOllkNcS1ZaLX6IdIx5Q9+dMCqNO6XfSFWWRS//UlGad8uvvj8Bw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-09T00:15:09.146960Z"},"content_sha256":"8719bd29a3d1a37da59c1f925aeb009e3ee9eb280b9095174f6424fa7515d559","schema_version":"1.0","event_id":"sha256:8719bd29a3d1a37da59c1f925aeb009e3ee9eb280b9095174f6424fa7515d559"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/4HQGPWNEOYWAWRUXZ6EVVFHWNL/bundle.json","state_url":"https://pith.science/pith/4HQGPWNEOYWAWRUXZ6EVVFHWNL/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/4HQGPWNEOYWAWRUXZ6EVVFHWNL/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":"2026-07-09T00:15:09Z","links":{"resolver":"https://pith.science/pith/4HQGPWNEOYWAWRUXZ6EVVFHWNL","bundle":"https://pith.science/pith/4HQGPWNEOYWAWRUXZ6EVVFHWNL/bundle.json","state":"https://pith.science/pith/4HQGPWNEOYWAWRUXZ6EVVFHWNL/state.json","well_known_bundle":"https://pith.science/.well-known/pith/4HQGPWNEOYWAWRUXZ6EVVFHWNL/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2020:4HQGPWNEOYWAWRUXZ6EVVFHWNL","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":"b521b4b34020cf26fb7bda7bc2558c32a71aef49b696f6c9bdafce612a6e6e09","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2020-12-01T13:57:15Z","title_canon_sha256":"f05b6e8f4f4db6dacc60c4d770bec936b51c56dbda71c3f4d649e594d2b5d29d"},"schema_version":"1.0","source":{"id":"2012.00491","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2012.00491","created_at":"2026-07-05T01:56:17Z"},{"alias_kind":"arxiv_version","alias_value":"2012.00491v1","created_at":"2026-07-05T01:56:17Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2012.00491","created_at":"2026-07-05T01:56:17Z"},{"alias_kind":"pith_short_12","alias_value":"4HQGPWNEOYWA","created_at":"2026-07-05T01:56:17Z"},{"alias_kind":"pith_short_16","alias_value":"4HQGPWNEOYWAWRUX","created_at":"2026-07-05T01:56:17Z"},{"alias_kind":"pith_short_8","alias_value":"4HQGPWNE","created_at":"2026-07-05T01:56:17Z"}],"graph_snapshots":[{"event_id":"sha256:8719bd29a3d1a37da59c1f925aeb009e3ee9eb280b9095174f6424fa7515d559","target":"graph","created_at":"2026-07-05T01:56:17Z","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"},"integrity":{"available":true,"clean":true,"detectors_run":[],"endpoint":"/pith/2012.00491/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"Contributing to the need of new graphene nanoribbon (GNR) structures that can be synthesized with atomic precision, we have designed a reactant that renders chiral (3,1) - GNRs after a multi-step reaction including Ullmann coupling and cyclodehydrogenation. The nanoribbon synthesis has been successfully proved on different coinage metals, and the formation process, together with the fingerprints associated to each reaction step, has been studied combining scanning tunnelling microscopy, core-level spectroscopy and density functional calculations. In addition to the GNR chiral edge structure, t","authors_text":"Aran Garcia-Lekue, Celia Rogero, Diego Pe\\~na, Dimas G. de Oteyza, Eduard Carbonell-Sanrom\\`a, Enrique Guitian, Guillaume Vasseur, J. Enrique Ortega, Jose Ignacio Pascua, Manuel Vilas-Varela, Martina Corso, Nestor Merino, Yutaka Wakayama","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2020-12-01T13:57:15Z","title":"Substrate-Independent Growth of Atomically Precise Chiral Graphene Nanoribbons"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2012.00491","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":"sha256:896ec6ad8825773a5429151233f6565d0ea4e661b29810f2ac74adb587f0603d","target":"record","created_at":"2026-07-05T01:56:17Z","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":"b521b4b34020cf26fb7bda7bc2558c32a71aef49b696f6c9bdafce612a6e6e09","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2020-12-01T13:57:15Z","title_canon_sha256":"f05b6e8f4f4db6dacc60c4d770bec936b51c56dbda71c3f4d649e594d2b5d29d"},"schema_version":"1.0","source":{"id":"2012.00491","kind":"arxiv","version":1}},"canonical_sha256":"e1e067d9a4762c0b4697cf895a94f66ac4b51f8a8e2ad46b7a2cc2e01670cd8c","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"e1e067d9a4762c0b4697cf895a94f66ac4b51f8a8e2ad46b7a2cc2e01670cd8c","first_computed_at":"2026-07-05T01:56:17.043351Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T01:56:17.043351Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"WPLqmmhwwZKncjfjMJqEs75OEq6llJtl6rhYM1GaQx7WIA9iHdzmSqkFFa84bjg91YEMWNePKib8dvrsENIsAA==","signature_status":"signed_v1","signed_at":"2026-07-05T01:56:17.043796Z","signed_message":"canonical_sha256_bytes"},"source_id":"2012.00491","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:896ec6ad8825773a5429151233f6565d0ea4e661b29810f2ac74adb587f0603d","sha256:8719bd29a3d1a37da59c1f925aeb009e3ee9eb280b9095174f6424fa7515d559"],"state_sha256":"55f4f7bb5b37974509868cbd4fbcf9bb615146d8a997f3fc30fb06772d0512e7"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"WFcxWHmHob/msHAGDt5lJCBMHGhoAd8bbAA3cO0dFOtvoxJncvvkjkiqxD/gDFANrrfCDvbNhEPz87p9M1zWCA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-07-09T00:15:09.149038Z","bundle_sha256":"9b64ee27d78c8d1c5578f12a4d9e6704d6eea7f50bba32f4dd340d21affbdcb5"}}