{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2018:VQQYN65JR7LP6FUNMXU55OBW6N","short_pith_number":"pith:VQQYN65J","canonical_record":{"source":{"id":"1805.03156","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.chem-ph","submitted_at":"2018-05-08T16:45:31Z","cross_cats_sorted":[],"title_canon_sha256":"644345fba8e9b8618cb8609472ecd1a6863525b1792fdbde1008006e108e1d3a","abstract_canon_sha256":"1c0677104de4429b30691a341b3436f62e5066455ff149064692addc9a9096e7"},"schema_version":"1.0"},"canonical_sha256":"ac2186fba98fd6ff168d65e9deb836f356ebb00ad3da44f02959667a13bceb1c","source":{"kind":"arxiv","id":"1805.03156","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1805.03156","created_at":"2026-05-18T00:15:13Z"},{"alias_kind":"arxiv_version","alias_value":"1805.03156v1","created_at":"2026-05-18T00:15:13Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1805.03156","created_at":"2026-05-18T00:15:13Z"},{"alias_kind":"pith_short_12","alias_value":"VQQYN65JR7LP","created_at":"2026-05-18T12:32:59Z"},{"alias_kind":"pith_short_16","alias_value":"VQQYN65JR7LP6FUN","created_at":"2026-05-18T12:32:59Z"},{"alias_kind":"pith_short_8","alias_value":"VQQYN65J","created_at":"2026-05-18T12:32:59Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2018:VQQYN65JR7LP6FUNMXU55OBW6N","target":"record","payload":{"canonical_record":{"source":{"id":"1805.03156","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.chem-ph","submitted_at":"2018-05-08T16:45:31Z","cross_cats_sorted":[],"title_canon_sha256":"644345fba8e9b8618cb8609472ecd1a6863525b1792fdbde1008006e108e1d3a","abstract_canon_sha256":"1c0677104de4429b30691a341b3436f62e5066455ff149064692addc9a9096e7"},"schema_version":"1.0"},"canonical_sha256":"ac2186fba98fd6ff168d65e9deb836f356ebb00ad3da44f02959667a13bceb1c","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T00:15:13.472841Z","signature_b64":"P2I+ZhjkihEd1JOZL9BQpj28xLWitZB9V0UT5etDkYFOWcbbk6y0OWZtiqUCml3Y61xcQxAoFcsIIyKK7s+4Dg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"ac2186fba98fd6ff168d65e9deb836f356ebb00ad3da44f02959667a13bceb1c","last_reissued_at":"2026-05-18T00:15:13.471984Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T00:15:13.471984Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1805.03156","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":"2026-05-18T00:15:13Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"wqPmOsD/r/o+tegXo938dTYMc6Q0Go8YUZXRbUo3lGan0AUkIJeTxS1D3A7tHQ782ieHtS6+eDO1hGR0XouRDg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-28T18:16:51.918896Z"},"content_sha256":"9a962a8627a4733d32fb5325a40f1cfcb4e402deb0def5b567f23e3e0030699a","schema_version":"1.0","event_id":"sha256:9a962a8627a4733d32fb5325a40f1cfcb4e402deb0def5b567f23e3e0030699a"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2018:VQQYN65JR7LP6FUNMXU55OBW6N","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Evaluation of reduced-graphene-oxide-supported gold nanoparticles as catalytic system for electroreduction of oxygen in alkaline electrolyte","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"physics.chem-ph","authors_text":"Enrico Negro, Iwona A. Rutkowska, Justyna Orlowska, Krzysztof Miecznikowski, Magdalena Blicharska, Pawel J. Kulesza, Sylwia Zoladek, Vito Di Noto, Weronika Ozimek","submitted_at":"2018-05-08T16:45:31Z","abstract_excerpt":"Chemically-reduced graphene-oxide-supported gold nanoparticles are considered here as catalytic materials for the reduction of oxygen in alkaline medium. Gold nanoparticles are prepared by the chemical reduction method, in which the NaBH4-prereduced Keggin-type phosphomolybdate heteropolyblue acts as the reducing agent for the precursor (HAuCl4). Polyoxmetallate (PMo12O403-) capping ligands stabilize gold nanoparticle deposits, facilitate their dispersion and attachment to carbon supports. Indeed, it is apparent from the independent diagnostic voltammetric experiments (in 0.5 mol dm-3 H2SO4) t"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1805.03156","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":"2026-05-18T00:15:13Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"/UDMJ+1uh6KoG+Vzc5Dku30vNYy9L88jPKKHl+FI85LvSo90xuZ6xUFCzASb3GpyfvPvnYey8jPweQj+2BXEAw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-28T18:16:51.919556Z"},"content_sha256":"a9a0eb09dd0a629d3633b2e234781871d41e7dfd28189551023710db05f5723b","schema_version":"1.0","event_id":"sha256:a9a0eb09dd0a629d3633b2e234781871d41e7dfd28189551023710db05f5723b"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/VQQYN65JR7LP6FUNMXU55OBW6N/bundle.json","state_url":"https://pith.science/pith/VQQYN65JR7LP6FUNMXU55OBW6N/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/VQQYN65JR7LP6FUNMXU55OBW6N/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":"2026-05-28T18:16:51Z","links":{"resolver":"https://pith.science/pith/VQQYN65JR7LP6FUNMXU55OBW6N","bundle":"https://pith.science/pith/VQQYN65JR7LP6FUNMXU55OBW6N/bundle.json","state":"https://pith.science/pith/VQQYN65JR7LP6FUNMXU55OBW6N/state.json","well_known_bundle":"https://pith.science/.well-known/pith/VQQYN65JR7LP6FUNMXU55OBW6N/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2018:VQQYN65JR7LP6FUNMXU55OBW6N","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":"1c0677104de4429b30691a341b3436f62e5066455ff149064692addc9a9096e7","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.chem-ph","submitted_at":"2018-05-08T16:45:31Z","title_canon_sha256":"644345fba8e9b8618cb8609472ecd1a6863525b1792fdbde1008006e108e1d3a"},"schema_version":"1.0","source":{"id":"1805.03156","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1805.03156","created_at":"2026-05-18T00:15:13Z"},{"alias_kind":"arxiv_version","alias_value":"1805.03156v1","created_at":"2026-05-18T00:15:13Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1805.03156","created_at":"2026-05-18T00:15:13Z"},{"alias_kind":"pith_short_12","alias_value":"VQQYN65JR7LP","created_at":"2026-05-18T12:32:59Z"},{"alias_kind":"pith_short_16","alias_value":"VQQYN65JR7LP6FUN","created_at":"2026-05-18T12:32:59Z"},{"alias_kind":"pith_short_8","alias_value":"VQQYN65J","created_at":"2026-05-18T12:32:59Z"}],"graph_snapshots":[{"event_id":"sha256:a9a0eb09dd0a629d3633b2e234781871d41e7dfd28189551023710db05f5723b","target":"graph","created_at":"2026-05-18T00:15:13Z","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":"Chemically-reduced graphene-oxide-supported gold nanoparticles are considered here as catalytic materials for the reduction of oxygen in alkaline medium. Gold nanoparticles are prepared by the chemical reduction method, in which the NaBH4-prereduced Keggin-type phosphomolybdate heteropolyblue acts as the reducing agent for the precursor (HAuCl4). Polyoxmetallate (PMo12O403-) capping ligands stabilize gold nanoparticle deposits, facilitate their dispersion and attachment to carbon supports. Indeed, it is apparent from the independent diagnostic voltammetric experiments (in 0.5 mol dm-3 H2SO4) t","authors_text":"Enrico Negro, Iwona A. Rutkowska, Justyna Orlowska, Krzysztof Miecznikowski, Magdalena Blicharska, Pawel J. Kulesza, Sylwia Zoladek, Vito Di Noto, Weronika Ozimek","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.chem-ph","submitted_at":"2018-05-08T16:45:31Z","title":"Evaluation of reduced-graphene-oxide-supported gold nanoparticles as catalytic system for electroreduction of oxygen in alkaline electrolyte"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1805.03156","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":"sha256:9a962a8627a4733d32fb5325a40f1cfcb4e402deb0def5b567f23e3e0030699a","target":"record","created_at":"2026-05-18T00:15:13Z","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":"1c0677104de4429b30691a341b3436f62e5066455ff149064692addc9a9096e7","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.chem-ph","submitted_at":"2018-05-08T16:45:31Z","title_canon_sha256":"644345fba8e9b8618cb8609472ecd1a6863525b1792fdbde1008006e108e1d3a"},"schema_version":"1.0","source":{"id":"1805.03156","kind":"arxiv","version":1}},"canonical_sha256":"ac2186fba98fd6ff168d65e9deb836f356ebb00ad3da44f02959667a13bceb1c","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"ac2186fba98fd6ff168d65e9deb836f356ebb00ad3da44f02959667a13bceb1c","first_computed_at":"2026-05-18T00:15:13.471984Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:15:13.471984Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"P2I+ZhjkihEd1JOZL9BQpj28xLWitZB9V0UT5etDkYFOWcbbk6y0OWZtiqUCml3Y61xcQxAoFcsIIyKK7s+4Dg==","signature_status":"signed_v1","signed_at":"2026-05-18T00:15:13.472841Z","signed_message":"canonical_sha256_bytes"},"source_id":"1805.03156","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:9a962a8627a4733d32fb5325a40f1cfcb4e402deb0def5b567f23e3e0030699a","sha256:a9a0eb09dd0a629d3633b2e234781871d41e7dfd28189551023710db05f5723b"],"state_sha256":"7d15c1bc9b757da53cb0c37ccf3ccc16b75e23041db4f594cb223bea2902e65a"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"SyYKdjCMKxbqtc2IOJMmlqZiKxOsRFmlmRnxo7vfvIqX6s4kmsgkaY5u85GLXQrVs2cfuuZjdAsEZ7zK6D8VDg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-28T18:16:51.922681Z","bundle_sha256":"d145244c7b997a048aa610507cf85daf05f5b4b44a18d83310b16e81329b85c6"}}