{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2014:T3JZPHM76EQXWV6EZUDK4XLMDF","short_pith_number":"pith:T3JZPHM7","canonical_record":{"source":{"id":"1408.2901","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2014-08-13T02:20:06Z","cross_cats_sorted":[],"title_canon_sha256":"cb3ea633e7091f47527d49cc43a19ffc50ea205a61734edd50f44515dae98e24","abstract_canon_sha256":"293be79fbc5b008eeccdb9fce14a935cbd563f057a97aa79c9a7af3980aa8a84"},"schema_version":"1.0"},"canonical_sha256":"9ed3979d9ff1217b57c4cd06ae5d6c1962f94ecdc33e7f5edcb1f396f276d6ea","source":{"kind":"arxiv","id":"1408.2901","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1408.2901","created_at":"2026-05-18T01:37:49Z"},{"alias_kind":"arxiv_version","alias_value":"1408.2901v2","created_at":"2026-05-18T01:37:49Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1408.2901","created_at":"2026-05-18T01:37:49Z"},{"alias_kind":"pith_short_12","alias_value":"T3JZPHM76EQX","created_at":"2026-05-18T12:28:49Z"},{"alias_kind":"pith_short_16","alias_value":"T3JZPHM76EQXWV6E","created_at":"2026-05-18T12:28:49Z"},{"alias_kind":"pith_short_8","alias_value":"T3JZPHM7","created_at":"2026-05-18T12:28:49Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2014:T3JZPHM76EQXWV6EZUDK4XLMDF","target":"record","payload":{"canonical_record":{"source":{"id":"1408.2901","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2014-08-13T02:20:06Z","cross_cats_sorted":[],"title_canon_sha256":"cb3ea633e7091f47527d49cc43a19ffc50ea205a61734edd50f44515dae98e24","abstract_canon_sha256":"293be79fbc5b008eeccdb9fce14a935cbd563f057a97aa79c9a7af3980aa8a84"},"schema_version":"1.0"},"canonical_sha256":"9ed3979d9ff1217b57c4cd06ae5d6c1962f94ecdc33e7f5edcb1f396f276d6ea","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:37:49.390021Z","signature_b64":"i83Ob12hK0vuzTM4/FDPv8weGkN/gynUJ2I/sypvFCJPIGdq2oT5SxHyfxeHcE/CK+4YhfV7GwadlhDjOmhTBA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"9ed3979d9ff1217b57c4cd06ae5d6c1962f94ecdc33e7f5edcb1f396f276d6ea","last_reissued_at":"2026-05-18T01:37:49.389364Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:37:49.389364Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1408.2901","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":"2026-05-18T01:37:49Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"6RSokK+7oM37dUVmjUonBnjQ+3bDcYORri+JMQv0Kdrx7BVMhrZPGu2K6c70yfRv9VIzHi/cxJtM54BBrbhtCg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-27T18:11:16.019911Z"},"content_sha256":"b0f8ccec5ffbeaaa308766983c627b4e0125db5423d529a5839679775162c26e","schema_version":"1.0","event_id":"sha256:b0f8ccec5ffbeaaa308766983c627b4e0125db5423d529a5839679775162c26e"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2014:T3JZPHM76EQXWV6EZUDK4XLMDF","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"The Phase Diagram and Hardness of Carbon Nitrides","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"cond-mat.mtrl-sci","authors_text":"Artem R. Oganov, Guang-Rui Qian, Huafeng Dong, Qiang Zhu","submitted_at":"2014-08-13T02:20:06Z","abstract_excerpt":"Novel superhard materials, especially those with superior thermal and chemical stability, are needed to replace diamond. Carbon nitrides (C-N), which are likely to possess these charac- teristics and have even been expected to be harder than diamond, are excellent candidates. Here we report three new superhard and thermodynamically stable carbon nitride phases. Based on a systematic evolutionary structure searches, we report a complete phase diagram of the C-N system at 0-300 GPa and analyze the hardest metastable structures. Surprising- ly, we find that at zero pressure, the earlier proposed "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1408.2901","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":"2026-05-18T01:37:49Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"xsHDpeZdfPNrKU0me6Na5ktcYdHidJivdgQs1SeilOvq8QaKnVHfSr5PKgzzoD4yUMFcOQfR5nMnczY8KFkwBA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-27T18:11:16.020249Z"},"content_sha256":"88eb165d22456843b6b5b6fc3e43a27291f6b9e8e4b5b2797a223ded72e53ba2","schema_version":"1.0","event_id":"sha256:88eb165d22456843b6b5b6fc3e43a27291f6b9e8e4b5b2797a223ded72e53ba2"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/T3JZPHM76EQXWV6EZUDK4XLMDF/bundle.json","state_url":"https://pith.science/pith/T3JZPHM76EQXWV6EZUDK4XLMDF/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/T3JZPHM76EQXWV6EZUDK4XLMDF/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":"2026-06-27T18:11:16Z","links":{"resolver":"https://pith.science/pith/T3JZPHM76EQXWV6EZUDK4XLMDF","bundle":"https://pith.science/pith/T3JZPHM76EQXWV6EZUDK4XLMDF/bundle.json","state":"https://pith.science/pith/T3JZPHM76EQXWV6EZUDK4XLMDF/state.json","well_known_bundle":"https://pith.science/.well-known/pith/T3JZPHM76EQXWV6EZUDK4XLMDF/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2014:T3JZPHM76EQXWV6EZUDK4XLMDF","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":"293be79fbc5b008eeccdb9fce14a935cbd563f057a97aa79c9a7af3980aa8a84","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2014-08-13T02:20:06Z","title_canon_sha256":"cb3ea633e7091f47527d49cc43a19ffc50ea205a61734edd50f44515dae98e24"},"schema_version":"1.0","source":{"id":"1408.2901","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1408.2901","created_at":"2026-05-18T01:37:49Z"},{"alias_kind":"arxiv_version","alias_value":"1408.2901v2","created_at":"2026-05-18T01:37:49Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1408.2901","created_at":"2026-05-18T01:37:49Z"},{"alias_kind":"pith_short_12","alias_value":"T3JZPHM76EQX","created_at":"2026-05-18T12:28:49Z"},{"alias_kind":"pith_short_16","alias_value":"T3JZPHM76EQXWV6E","created_at":"2026-05-18T12:28:49Z"},{"alias_kind":"pith_short_8","alias_value":"T3JZPHM7","created_at":"2026-05-18T12:28:49Z"}],"graph_snapshots":[{"event_id":"sha256:88eb165d22456843b6b5b6fc3e43a27291f6b9e8e4b5b2797a223ded72e53ba2","target":"graph","created_at":"2026-05-18T01:37:49Z","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":"Novel superhard materials, especially those with superior thermal and chemical stability, are needed to replace diamond. Carbon nitrides (C-N), which are likely to possess these charac- teristics and have even been expected to be harder than diamond, are excellent candidates. Here we report three new superhard and thermodynamically stable carbon nitride phases. Based on a systematic evolutionary structure searches, we report a complete phase diagram of the C-N system at 0-300 GPa and analyze the hardest metastable structures. Surprising- ly, we find that at zero pressure, the earlier proposed ","authors_text":"Artem R. Oganov, Guang-Rui Qian, Huafeng Dong, Qiang Zhu","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2014-08-13T02:20:06Z","title":"The Phase Diagram and Hardness of Carbon Nitrides"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1408.2901","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:b0f8ccec5ffbeaaa308766983c627b4e0125db5423d529a5839679775162c26e","target":"record","created_at":"2026-05-18T01:37:49Z","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":"293be79fbc5b008eeccdb9fce14a935cbd563f057a97aa79c9a7af3980aa8a84","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2014-08-13T02:20:06Z","title_canon_sha256":"cb3ea633e7091f47527d49cc43a19ffc50ea205a61734edd50f44515dae98e24"},"schema_version":"1.0","source":{"id":"1408.2901","kind":"arxiv","version":2}},"canonical_sha256":"9ed3979d9ff1217b57c4cd06ae5d6c1962f94ecdc33e7f5edcb1f396f276d6ea","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"9ed3979d9ff1217b57c4cd06ae5d6c1962f94ecdc33e7f5edcb1f396f276d6ea","first_computed_at":"2026-05-18T01:37:49.389364Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:37:49.389364Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"i83Ob12hK0vuzTM4/FDPv8weGkN/gynUJ2I/sypvFCJPIGdq2oT5SxHyfxeHcE/CK+4YhfV7GwadlhDjOmhTBA==","signature_status":"signed_v1","signed_at":"2026-05-18T01:37:49.390021Z","signed_message":"canonical_sha256_bytes"},"source_id":"1408.2901","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:b0f8ccec5ffbeaaa308766983c627b4e0125db5423d529a5839679775162c26e","sha256:88eb165d22456843b6b5b6fc3e43a27291f6b9e8e4b5b2797a223ded72e53ba2"],"state_sha256":"6b45634d3ec318e3bec223b267615a3fe0a2876ac3748d8d50b094b6f388ed30"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"vrYxsCuf4eCUmJxZGxDQYVQxk34uuf9r09iTUMOnFSE2PcAH01GWHwG3MUwaMBnR9bRrro5ExVA+fijLNLwVBA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-27T18:11:16.022073Z","bundle_sha256":"79a733981a1f771cfdc91db56cbdd12c7b150bb0b43f36a477ff6f8810337f83"}}