{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2021:CXSHONAHIYD5TNX5DKQEY3IC55","short_pith_number":"pith:CXSHONAH","canonical_record":{"source":{"id":"2110.15628","kind":"arxiv","version":2},"metadata":{"license":"http://creativecommons.org/licenses/by-nc-nd/4.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2021-10-29T08:54:55Z","cross_cats_sorted":[],"title_canon_sha256":"ac93b1962ab4e40e6f56b7ecf6eb04c205dc34501f5eb1acfd8be06c59a0f988","abstract_canon_sha256":"bf32f4e222f27c5867f9d4d705c3a7a800561a59cd565e95edf0cb4771f169ee"},"schema_version":"1.0"},"canonical_sha256":"15e47734074607d9b6fd1aa04c6d02ef7b417be16812c67d36e44bb3f15cb81b","source":{"kind":"arxiv","id":"2110.15628","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2110.15628","created_at":"2026-07-05T04:17:37Z"},{"alias_kind":"arxiv_version","alias_value":"2110.15628v2","created_at":"2026-07-05T04:17:37Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2110.15628","created_at":"2026-07-05T04:17:37Z"},{"alias_kind":"pith_short_12","alias_value":"CXSHONAHIYD5","created_at":"2026-07-05T04:17:37Z"},{"alias_kind":"pith_short_16","alias_value":"CXSHONAHIYD5TNX5","created_at":"2026-07-05T04:17:37Z"},{"alias_kind":"pith_short_8","alias_value":"CXSHONAH","created_at":"2026-07-05T04:17:37Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2021:CXSHONAHIYD5TNX5DKQEY3IC55","target":"record","payload":{"canonical_record":{"source":{"id":"2110.15628","kind":"arxiv","version":2},"metadata":{"license":"http://creativecommons.org/licenses/by-nc-nd/4.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2021-10-29T08:54:55Z","cross_cats_sorted":[],"title_canon_sha256":"ac93b1962ab4e40e6f56b7ecf6eb04c205dc34501f5eb1acfd8be06c59a0f988","abstract_canon_sha256":"bf32f4e222f27c5867f9d4d705c3a7a800561a59cd565e95edf0cb4771f169ee"},"schema_version":"1.0"},"canonical_sha256":"15e47734074607d9b6fd1aa04c6d02ef7b417be16812c67d36e44bb3f15cb81b","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T04:17:37.008363Z","signature_b64":"H4zkCVEdqbx53qSiYOYd74tIHVO5xha8OcKrxJitEjxb6ktweOQlydV1z0TZOS0fKuHmOGSfV5FZmjksEmg6Dw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"15e47734074607d9b6fd1aa04c6d02ef7b417be16812c67d36e44bb3f15cb81b","last_reissued_at":"2026-07-05T04:17:37.007910Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T04:17:37.007910Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2110.15628","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":"2026-07-05T04:17:37Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"FN6QrXznHEgeHy1ql4zu2s0kPANKFoTt0Ohh0DgEmWGfTooyrpA3cjmmmM4+1/PvmqIHLSyWVxb4r73JOpYAAw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-04T13:17:12.017218Z"},"content_sha256":"99bf15acbcd8a370875b39ed09fb245bff909b00a9abc64561c2089dad13dbe8","schema_version":"1.0","event_id":"sha256:99bf15acbcd8a370875b39ed09fb245bff909b00a9abc64561c2089dad13dbe8"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2021:CXSHONAHIYD5TNX5DKQEY3IC55","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Sr-Doped Molecular Hydrogen: Synthesis and Properties of SrH$_{22}$","license":"http://creativecommons.org/licenses/by-nc-nd/4.0/","headline":"","cross_cats":[],"primary_cat":"cond-mat.mtrl-sci","authors_text":"Alexander G. Kvashnin, Arslan B. Mazitov, Artem R. Oganov, Christian Tantardini, Di Zhou, Dmitrii V. Semenok, Ivan A. Kruglov, Michele Galasso, Tian Cui, Wuhao Chen, Xavier Gonze, Xiaoli Huang","submitted_at":"2021-10-29T08:54:55Z","abstract_excerpt":"Recently, several research groups announced reaching the point of metallization of hydrogen above 400 GPa. Following the mainstream of extensive investigations of compressed polyhydrides, in this work we demonstrate that small (4 atom %) doping of molecular hydrogen by strontium leads to a dramatic reduction in the metallization pressure to about 200 GPa. Studying the high-pressure chemistry of the Sr-H system at 56-180 GPa, we observed the formation of several previously unknown compounds: C2/m-Sr$_3$H$_{13}$, pseudocubic SrH$_6$, SrH$_9$ with cubic F-43m Sr sublattice, and pseudotetragonal P"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2110.15628","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/2110.15628/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":"2026-07-05T04:17:37Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"//Bi/sT/FHWlyqJqGkyiIGRyQvOYu4HE9inBrcpvgwKLXfqd7RHEJ6Ny57xM751HAZep1A4jLRmdUnjvgVj0BQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-04T13:17:12.018330Z"},"content_sha256":"7e24542094386769abea16c63d9293d41165f5e8d13cc86d47acab0dcb70488e","schema_version":"1.0","event_id":"sha256:7e24542094386769abea16c63d9293d41165f5e8d13cc86d47acab0dcb70488e"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/CXSHONAHIYD5TNX5DKQEY3IC55/bundle.json","state_url":"https://pith.science/pith/CXSHONAHIYD5TNX5DKQEY3IC55/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/CXSHONAHIYD5TNX5DKQEY3IC55/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":"2026-08-04T13:17:12Z","links":{"resolver":"https://pith.science/pith/CXSHONAHIYD5TNX5DKQEY3IC55","bundle":"https://pith.science/pith/CXSHONAHIYD5TNX5DKQEY3IC55/bundle.json","state":"https://pith.science/pith/CXSHONAHIYD5TNX5DKQEY3IC55/state.json","well_known_bundle":"https://pith.science/.well-known/pith/CXSHONAHIYD5TNX5DKQEY3IC55/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2021:CXSHONAHIYD5TNX5DKQEY3IC55","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":"bf32f4e222f27c5867f9d4d705c3a7a800561a59cd565e95edf0cb4771f169ee","cross_cats_sorted":[],"license":"http://creativecommons.org/licenses/by-nc-nd/4.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2021-10-29T08:54:55Z","title_canon_sha256":"ac93b1962ab4e40e6f56b7ecf6eb04c205dc34501f5eb1acfd8be06c59a0f988"},"schema_version":"1.0","source":{"id":"2110.15628","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2110.15628","created_at":"2026-07-05T04:17:37Z"},{"alias_kind":"arxiv_version","alias_value":"2110.15628v2","created_at":"2026-07-05T04:17:37Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2110.15628","created_at":"2026-07-05T04:17:37Z"},{"alias_kind":"pith_short_12","alias_value":"CXSHONAHIYD5","created_at":"2026-07-05T04:17:37Z"},{"alias_kind":"pith_short_16","alias_value":"CXSHONAHIYD5TNX5","created_at":"2026-07-05T04:17:37Z"},{"alias_kind":"pith_short_8","alias_value":"CXSHONAH","created_at":"2026-07-05T04:17:37Z"}],"graph_snapshots":[{"event_id":"sha256:7e24542094386769abea16c63d9293d41165f5e8d13cc86d47acab0dcb70488e","target":"graph","created_at":"2026-07-05T04:17:37Z","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/2110.15628/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"Recently, several research groups announced reaching the point of metallization of hydrogen above 400 GPa. Following the mainstream of extensive investigations of compressed polyhydrides, in this work we demonstrate that small (4 atom %) doping of molecular hydrogen by strontium leads to a dramatic reduction in the metallization pressure to about 200 GPa. Studying the high-pressure chemistry of the Sr-H system at 56-180 GPa, we observed the formation of several previously unknown compounds: C2/m-Sr$_3$H$_{13}$, pseudocubic SrH$_6$, SrH$_9$ with cubic F-43m Sr sublattice, and pseudotetragonal P","authors_text":"Alexander G. Kvashnin, Arslan B. Mazitov, Artem R. Oganov, Christian Tantardini, Di Zhou, Dmitrii V. Semenok, Ivan A. Kruglov, Michele Galasso, Tian Cui, Wuhao Chen, Xavier Gonze, Xiaoli Huang","cross_cats":[],"headline":"","license":"http://creativecommons.org/licenses/by-nc-nd/4.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2021-10-29T08:54:55Z","title":"Sr-Doped Molecular Hydrogen: Synthesis and Properties of SrH$_{22}$"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2110.15628","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":"sha256:99bf15acbcd8a370875b39ed09fb245bff909b00a9abc64561c2089dad13dbe8","target":"record","created_at":"2026-07-05T04:17:37Z","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":"bf32f4e222f27c5867f9d4d705c3a7a800561a59cd565e95edf0cb4771f169ee","cross_cats_sorted":[],"license":"http://creativecommons.org/licenses/by-nc-nd/4.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2021-10-29T08:54:55Z","title_canon_sha256":"ac93b1962ab4e40e6f56b7ecf6eb04c205dc34501f5eb1acfd8be06c59a0f988"},"schema_version":"1.0","source":{"id":"2110.15628","kind":"arxiv","version":2}},"canonical_sha256":"15e47734074607d9b6fd1aa04c6d02ef7b417be16812c67d36e44bb3f15cb81b","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"15e47734074607d9b6fd1aa04c6d02ef7b417be16812c67d36e44bb3f15cb81b","first_computed_at":"2026-07-05T04:17:37.007910Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T04:17:37.007910Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"H4zkCVEdqbx53qSiYOYd74tIHVO5xha8OcKrxJitEjxb6ktweOQlydV1z0TZOS0fKuHmOGSfV5FZmjksEmg6Dw==","signature_status":"signed_v1","signed_at":"2026-07-05T04:17:37.008363Z","signed_message":"canonical_sha256_bytes"},"source_id":"2110.15628","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:99bf15acbcd8a370875b39ed09fb245bff909b00a9abc64561c2089dad13dbe8","sha256:7e24542094386769abea16c63d9293d41165f5e8d13cc86d47acab0dcb70488e"],"state_sha256":"50d0f16fb18fa677a2b783e75a2d588f2b432f13871c929384bf0ceb4b1df550"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"ZOP6Qi0ww3D9AMr6KkJtBReMLYRYAHp+9yYWW3PqAsXZbK0C/UdHuzLNuHch30oED3vXeftHByaGyZikayhmDw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-04T13:17:12.034406Z","bundle_sha256":"ff08d976baa68c564f88efda668a1488e5c7516031e5a6d80adcc35e7dae8fb4"}}