{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2019:ADT3AZBH3XD3H2AI23ZHZZ732X","short_pith_number":"pith:ADT3AZBH","canonical_record":{"source":{"id":"1904.06643","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2019-04-14T07:24:31Z","cross_cats_sorted":["cond-mat.supr-con"],"title_canon_sha256":"61624531d8899bf74dbd24d6a5ef0e871506eb1019c60bf080bcb94af1715963","abstract_canon_sha256":"93f72039d3c473fb4a8d9d93d664ac1ae154a755b0513dd038d0a8199567ac54"},"schema_version":"1.0"},"canonical_sha256":"00e7b06427ddc7b3e808d6f27ce7fbd5db26be17118a5130d84b6e6bd62c28be","source":{"kind":"arxiv","id":"1904.06643","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1904.06643","created_at":"2026-07-05T00:33:11Z"},{"alias_kind":"arxiv_version","alias_value":"1904.06643v2","created_at":"2026-07-05T00:33:11Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1904.06643","created_at":"2026-07-05T00:33:11Z"},{"alias_kind":"pith_short_12","alias_value":"ADT3AZBH3XD3","created_at":"2026-07-05T00:33:11Z"},{"alias_kind":"pith_short_16","alias_value":"ADT3AZBH3XD3H2AI","created_at":"2026-07-05T00:33:11Z"},{"alias_kind":"pith_short_8","alias_value":"ADT3AZBH","created_at":"2026-07-05T00:33:11Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2019:ADT3AZBH3XD3H2AI23ZHZZ732X","target":"record","payload":{"canonical_record":{"source":{"id":"1904.06643","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2019-04-14T07:24:31Z","cross_cats_sorted":["cond-mat.supr-con"],"title_canon_sha256":"61624531d8899bf74dbd24d6a5ef0e871506eb1019c60bf080bcb94af1715963","abstract_canon_sha256":"93f72039d3c473fb4a8d9d93d664ac1ae154a755b0513dd038d0a8199567ac54"},"schema_version":"1.0"},"canonical_sha256":"00e7b06427ddc7b3e808d6f27ce7fbd5db26be17118a5130d84b6e6bd62c28be","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T00:33:11.764946Z","signature_b64":"hQExaqKti4t7bmyV1T+Wps4O4KXLuV9TbEOijWnbc3U4YgPNKMzF4NniulhwTDMobkURbbjofeOpy8H8VItgDw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"00e7b06427ddc7b3e808d6f27ce7fbd5db26be17118a5130d84b6e6bd62c28be","last_reissued_at":"2026-07-05T00:33:11.764374Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T00:33:11.764374Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1904.06643","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":"2026-07-05T00:33:11Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"zf0StvTsd8wtt0OYO960ktaTmrnFfnb86zMFbO0fo4V8jgWjIK81uy5ki5kUiplIw+12W760rOtZ4YcxwQWyBg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-01T08:14:21.094335Z"},"content_sha256":"0e503f93af8d7c9aca97a32db2dcb0d5459144c2472ea49246bed4658a7c8881","schema_version":"1.0","event_id":"sha256:0e503f93af8d7c9aca97a32db2dcb0d5459144c2472ea49246bed4658a7c8881"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2019:ADT3AZBH3XD3H2AI23ZHZZ732X","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Superconducting Praseodymium Superhydrides","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["cond-mat.supr-con"],"primary_cat":"cond-mat.mtrl-sci","authors_text":"Artem R. Oganov, Bingbing Liu, Defang Duan, Di Zhou, Dmitrii Semenok, Hui Xie, Tian Cui, Wuhao Chen, Xiaoli Huang, Xin Li","submitted_at":"2019-04-14T07:24:31Z","abstract_excerpt":"Superhydrides have complex hydrogenic sublattices and are important prototypes for studying metallic hydrogen and high-temperature superconductors. Encouraged by the results on LaH10, in consideration of the differences between La and Pr, Pr-H system is especially worth studying because of the magnetism and valence-band f-electrons in element Pr. Here we successfully synthesized praseodymium superhydrides (PrH9) in laser-heated diamond anvil cells. Synchrotron X-ray diffraction (XRD) analysis demonstrated the presence of previously predicted F43m-PrH9 and unexpected P63/mmc-PrH9 phases. Moreov"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1904.06643","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":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/1904.06643/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":"2026-07-05T00:33:11Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"6xt8KH2vh4K5K9fBugfT39EyrPSAvl5KwVSxGbiWyLUuqPXfu0cwEZ7TBZpna82LSi2Dc7/iH71vJYnyHphCDA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-01T08:14:21.094708Z"},"content_sha256":"c5e87926e579053637e755581b8db21e0a66e318563f9dd8f77dfbafa52eef29","schema_version":"1.0","event_id":"sha256:c5e87926e579053637e755581b8db21e0a66e318563f9dd8f77dfbafa52eef29"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/ADT3AZBH3XD3H2AI23ZHZZ732X/bundle.json","state_url":"https://pith.science/pith/ADT3AZBH3XD3H2AI23ZHZZ732X/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/ADT3AZBH3XD3H2AI23ZHZZ732X/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":"2026-08-01T08:14:21Z","links":{"resolver":"https://pith.science/pith/ADT3AZBH3XD3H2AI23ZHZZ732X","bundle":"https://pith.science/pith/ADT3AZBH3XD3H2AI23ZHZZ732X/bundle.json","state":"https://pith.science/pith/ADT3AZBH3XD3H2AI23ZHZZ732X/state.json","well_known_bundle":"https://pith.science/.well-known/pith/ADT3AZBH3XD3H2AI23ZHZZ732X/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2019:ADT3AZBH3XD3H2AI23ZHZZ732X","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":"93f72039d3c473fb4a8d9d93d664ac1ae154a755b0513dd038d0a8199567ac54","cross_cats_sorted":["cond-mat.supr-con"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2019-04-14T07:24:31Z","title_canon_sha256":"61624531d8899bf74dbd24d6a5ef0e871506eb1019c60bf080bcb94af1715963"},"schema_version":"1.0","source":{"id":"1904.06643","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1904.06643","created_at":"2026-07-05T00:33:11Z"},{"alias_kind":"arxiv_version","alias_value":"1904.06643v2","created_at":"2026-07-05T00:33:11Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1904.06643","created_at":"2026-07-05T00:33:11Z"},{"alias_kind":"pith_short_12","alias_value":"ADT3AZBH3XD3","created_at":"2026-07-05T00:33:11Z"},{"alias_kind":"pith_short_16","alias_value":"ADT3AZBH3XD3H2AI","created_at":"2026-07-05T00:33:11Z"},{"alias_kind":"pith_short_8","alias_value":"ADT3AZBH","created_at":"2026-07-05T00:33:11Z"}],"graph_snapshots":[{"event_id":"sha256:c5e87926e579053637e755581b8db21e0a66e318563f9dd8f77dfbafa52eef29","target":"graph","created_at":"2026-07-05T00:33:11Z","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/1904.06643/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"Superhydrides have complex hydrogenic sublattices and are important prototypes for studying metallic hydrogen and high-temperature superconductors. Encouraged by the results on LaH10, in consideration of the differences between La and Pr, Pr-H system is especially worth studying because of the magnetism and valence-band f-electrons in element Pr. Here we successfully synthesized praseodymium superhydrides (PrH9) in laser-heated diamond anvil cells. Synchrotron X-ray diffraction (XRD) analysis demonstrated the presence of previously predicted F43m-PrH9 and unexpected P63/mmc-PrH9 phases. Moreov","authors_text":"Artem R. Oganov, Bingbing Liu, Defang Duan, Di Zhou, Dmitrii Semenok, Hui Xie, Tian Cui, Wuhao Chen, Xiaoli Huang, Xin Li","cross_cats":["cond-mat.supr-con"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2019-04-14T07:24:31Z","title":"Superconducting Praseodymium Superhydrides"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1904.06643","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":"sha256:0e503f93af8d7c9aca97a32db2dcb0d5459144c2472ea49246bed4658a7c8881","target":"record","created_at":"2026-07-05T00:33:11Z","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":"93f72039d3c473fb4a8d9d93d664ac1ae154a755b0513dd038d0a8199567ac54","cross_cats_sorted":["cond-mat.supr-con"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2019-04-14T07:24:31Z","title_canon_sha256":"61624531d8899bf74dbd24d6a5ef0e871506eb1019c60bf080bcb94af1715963"},"schema_version":"1.0","source":{"id":"1904.06643","kind":"arxiv","version":2}},"canonical_sha256":"00e7b06427ddc7b3e808d6f27ce7fbd5db26be17118a5130d84b6e6bd62c28be","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"00e7b06427ddc7b3e808d6f27ce7fbd5db26be17118a5130d84b6e6bd62c28be","first_computed_at":"2026-07-05T00:33:11.764374Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T00:33:11.764374Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"hQExaqKti4t7bmyV1T+Wps4O4KXLuV9TbEOijWnbc3U4YgPNKMzF4NniulhwTDMobkURbbjofeOpy8H8VItgDw==","signature_status":"signed_v1","signed_at":"2026-07-05T00:33:11.764946Z","signed_message":"canonical_sha256_bytes"},"source_id":"1904.06643","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:0e503f93af8d7c9aca97a32db2dcb0d5459144c2472ea49246bed4658a7c8881","sha256:c5e87926e579053637e755581b8db21e0a66e318563f9dd8f77dfbafa52eef29"],"state_sha256":"3af5ff6b4eec28840025d47a7fca681ece5a6ba3e358515ad41f533687a1ab5f"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"gPyHhGrbcIwVxPD2DNbN98oEZZzQXAZUtoO4vnXsaST8gV3UcFpmOfK8lvfuZMnsSG85lxfcEwJRzxGzOarxDg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-01T08:14:21.097235Z","bundle_sha256":"5d3593252622b639d64bd558b9adbd7414c5b3a7ff4c90ee358c439274fc8ed7"}}