{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2025:7QZ7OHNAYY6YYRTQNLCBHM6PGP","short_pith_number":"pith:7QZ7OHNA","canonical_record":{"source":{"id":"2512.20228","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"cond-mat.supr-con","submitted_at":"2025-12-23T10:40:50Z","cross_cats_sorted":["cond-mat.mtrl-sci"],"title_canon_sha256":"09e3e8744a5dbc4d4f97f32125924efef9f801275a350ea5ed13c2aedfef086d","abstract_canon_sha256":"16877cd3ae1af0f3c53bf1117a0174bcd6faa923fbc1702a8b5216854d0028fd"},"schema_version":"1.0"},"canonical_sha256":"fc33f71da0c63d8c46706ac413b3cf33fd4cb79675c14fd34c574e9a759d4c54","source":{"kind":"arxiv","id":"2512.20228","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2512.20228","created_at":"2026-05-20T00:01:38Z"},{"alias_kind":"arxiv_version","alias_value":"2512.20228v1","created_at":"2026-05-20T00:01:38Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2512.20228","created_at":"2026-05-20T00:01:38Z"},{"alias_kind":"pith_short_12","alias_value":"7QZ7OHNAYY6Y","created_at":"2026-05-20T00:01:38Z"},{"alias_kind":"pith_short_16","alias_value":"7QZ7OHNAYY6YYRTQ","created_at":"2026-05-20T00:01:38Z"},{"alias_kind":"pith_short_8","alias_value":"7QZ7OHNA","created_at":"2026-05-20T00:01:38Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2025:7QZ7OHNAYY6YYRTQNLCBHM6PGP","target":"record","payload":{"canonical_record":{"source":{"id":"2512.20228","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"cond-mat.supr-con","submitted_at":"2025-12-23T10:40:50Z","cross_cats_sorted":["cond-mat.mtrl-sci"],"title_canon_sha256":"09e3e8744a5dbc4d4f97f32125924efef9f801275a350ea5ed13c2aedfef086d","abstract_canon_sha256":"16877cd3ae1af0f3c53bf1117a0174bcd6faa923fbc1702a8b5216854d0028fd"},"schema_version":"1.0"},"canonical_sha256":"fc33f71da0c63d8c46706ac413b3cf33fd4cb79675c14fd34c574e9a759d4c54","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-20T00:01:38.289658Z","signature_b64":"5fVuG4maXsFCe3Ur+TtHQ9Bf64uRlfK5TWsqo4iUMPmgHZPV99bCBdVgivjJLlUQohzfLqOaMEH7su91lAr2AQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"fc33f71da0c63d8c46706ac413b3cf33fd4cb79675c14fd34c574e9a759d4c54","last_reissued_at":"2026-05-20T00:01:38.288947Z","signature_status":"signed_v1","first_computed_at":"2026-05-20T00:01:38.288947Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2512.20228","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":"2026-05-20T00:01:38Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"W21OJe4ahNnUkS4a4nVKGUt7Y1lqI5d42RsHYje4QEzaftRX/3O18a/hpf2oSRrQecU1c2zR9UMWdwovoX6LBQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-30T18:19:24.225766Z"},"content_sha256":"8d624e7410de7bf1441e086d8a57195cfc5da7a073e4ba3fe4b2bcebaa849592","schema_version":"1.0","event_id":"sha256:8d624e7410de7bf1441e086d8a57195cfc5da7a073e4ba3fe4b2bcebaa849592"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2025:7QZ7OHNAYY6YYRTQNLCBHM6PGP","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Composition-Based Machine Learning for Screening Superconducting Ternary Hydrides from a Curated Dataset","license":"http://creativecommons.org/licenses/by/4.0/","headline":"","cross_cats":["cond-mat.mtrl-sci"],"primary_cat":"cond-mat.supr-con","authors_text":"Katsuaki Tanabe, Kazuaki Tokuyama, Souta Miyamoto, Taichi Masuda","submitted_at":"2025-12-23T10:40:50Z","abstract_excerpt":"We present an ensemble machine-learning approach for composition-based, structure-agnostic screening of candidate superconductors among ternary hydrides under high pressure. Hydrogen-rich hydrides are known to exhibit high superconducting transition temperatures, and ternary or multinary hydrides can stabilize superconducting phases at reduced pressures through chemical compression. To systematically explore this vast compositional space, we construct an ensemble of 30 XGBoost regression models trained on a curated dataset of approximately 2000 binary and ternary hydride entries. The model ens"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2512.20228","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/2512.20228/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":"2026-05-20T00:01:38Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"IuCoHUfvEP0ZzyKULyMXNLtWPGXVDFpFtdhgfifNzw4waiXuY9thNFSOI3wH8PorNseh+F+ncPclN88DRAXEBQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-30T18:19:24.226451Z"},"content_sha256":"5837c2dfb9561ae58de086bc91949ba8a293612ab5c52d133ed1c7038c55d1a7","schema_version":"1.0","event_id":"sha256:5837c2dfb9561ae58de086bc91949ba8a293612ab5c52d133ed1c7038c55d1a7"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/7QZ7OHNAYY6YYRTQNLCBHM6PGP/bundle.json","state_url":"https://pith.science/pith/7QZ7OHNAYY6YYRTQNLCBHM6PGP/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/7QZ7OHNAYY6YYRTQNLCBHM6PGP/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":"2026-05-30T18:19:24Z","links":{"resolver":"https://pith.science/pith/7QZ7OHNAYY6YYRTQNLCBHM6PGP","bundle":"https://pith.science/pith/7QZ7OHNAYY6YYRTQNLCBHM6PGP/bundle.json","state":"https://pith.science/pith/7QZ7OHNAYY6YYRTQNLCBHM6PGP/state.json","well_known_bundle":"https://pith.science/.well-known/pith/7QZ7OHNAYY6YYRTQNLCBHM6PGP/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2025:7QZ7OHNAYY6YYRTQNLCBHM6PGP","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":"16877cd3ae1af0f3c53bf1117a0174bcd6faa923fbc1702a8b5216854d0028fd","cross_cats_sorted":["cond-mat.mtrl-sci"],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"cond-mat.supr-con","submitted_at":"2025-12-23T10:40:50Z","title_canon_sha256":"09e3e8744a5dbc4d4f97f32125924efef9f801275a350ea5ed13c2aedfef086d"},"schema_version":"1.0","source":{"id":"2512.20228","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2512.20228","created_at":"2026-05-20T00:01:38Z"},{"alias_kind":"arxiv_version","alias_value":"2512.20228v1","created_at":"2026-05-20T00:01:38Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2512.20228","created_at":"2026-05-20T00:01:38Z"},{"alias_kind":"pith_short_12","alias_value":"7QZ7OHNAYY6Y","created_at":"2026-05-20T00:01:38Z"},{"alias_kind":"pith_short_16","alias_value":"7QZ7OHNAYY6YYRTQ","created_at":"2026-05-20T00:01:38Z"},{"alias_kind":"pith_short_8","alias_value":"7QZ7OHNA","created_at":"2026-05-20T00:01:38Z"}],"graph_snapshots":[{"event_id":"sha256:5837c2dfb9561ae58de086bc91949ba8a293612ab5c52d133ed1c7038c55d1a7","target":"graph","created_at":"2026-05-20T00:01:38Z","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/2512.20228/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"We present an ensemble machine-learning approach for composition-based, structure-agnostic screening of candidate superconductors among ternary hydrides under high pressure. Hydrogen-rich hydrides are known to exhibit high superconducting transition temperatures, and ternary or multinary hydrides can stabilize superconducting phases at reduced pressures through chemical compression. To systematically explore this vast compositional space, we construct an ensemble of 30 XGBoost regression models trained on a curated dataset of approximately 2000 binary and ternary hydride entries. The model ens","authors_text":"Katsuaki Tanabe, Kazuaki Tokuyama, Souta Miyamoto, Taichi Masuda","cross_cats":["cond-mat.mtrl-sci"],"headline":"","license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"cond-mat.supr-con","submitted_at":"2025-12-23T10:40:50Z","title":"Composition-Based Machine Learning for Screening Superconducting Ternary Hydrides from a Curated Dataset"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2512.20228","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":"sha256:8d624e7410de7bf1441e086d8a57195cfc5da7a073e4ba3fe4b2bcebaa849592","target":"record","created_at":"2026-05-20T00:01:38Z","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":"16877cd3ae1af0f3c53bf1117a0174bcd6faa923fbc1702a8b5216854d0028fd","cross_cats_sorted":["cond-mat.mtrl-sci"],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"cond-mat.supr-con","submitted_at":"2025-12-23T10:40:50Z","title_canon_sha256":"09e3e8744a5dbc4d4f97f32125924efef9f801275a350ea5ed13c2aedfef086d"},"schema_version":"1.0","source":{"id":"2512.20228","kind":"arxiv","version":1}},"canonical_sha256":"fc33f71da0c63d8c46706ac413b3cf33fd4cb79675c14fd34c574e9a759d4c54","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"fc33f71da0c63d8c46706ac413b3cf33fd4cb79675c14fd34c574e9a759d4c54","first_computed_at":"2026-05-20T00:01:38.288947Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-20T00:01:38.288947Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"5fVuG4maXsFCe3Ur+TtHQ9Bf64uRlfK5TWsqo4iUMPmgHZPV99bCBdVgivjJLlUQohzfLqOaMEH7su91lAr2AQ==","signature_status":"signed_v1","signed_at":"2026-05-20T00:01:38.289658Z","signed_message":"canonical_sha256_bytes"},"source_id":"2512.20228","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:8d624e7410de7bf1441e086d8a57195cfc5da7a073e4ba3fe4b2bcebaa849592","sha256:5837c2dfb9561ae58de086bc91949ba8a293612ab5c52d133ed1c7038c55d1a7"],"state_sha256":"093b2c1a6963dad0a94631403780701d4cf3421b0784ebb1c1c836e1b3837e85"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"KSQ4QWgYKoE0AlyDojtVI6Tnow84jZuiAWOkbS4clI22btksuwSPU2ULEu0e02wWk1d8EBZGAACjGMAOWM1OAA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-30T18:19:24.229731Z","bundle_sha256":"29116770243b4aa873a80e83db8e57e019c591e8d23df1dffd7345d3ce3ee941"}}