{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2021:3VJXJMRBECVUSAMME72VN5Q365","short_pith_number":"pith:3VJXJMRB","canonical_record":{"source":{"id":"2109.07654","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"cond-mat.supr-con","submitted_at":"2021-09-16T01:15:59Z","cross_cats_sorted":[],"title_canon_sha256":"7e26e4fbc1429731b95a593093cac17802469e16068784f8cebe444e8653df9b","abstract_canon_sha256":"dd30cfee5939c89635a55609b40b844643c7b753e8861cc7534ca43131a3d18a"},"schema_version":"1.0"},"canonical_sha256":"dd5374b22120ab49018c27f556f61bf778f1c3b85c7a67a94444971b679524c4","source":{"kind":"arxiv","id":"2109.07654","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2109.07654","created_at":"2026-07-05T03:48:08Z"},{"alias_kind":"arxiv_version","alias_value":"2109.07654v1","created_at":"2026-07-05T03:48:08Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2109.07654","created_at":"2026-07-05T03:48:08Z"},{"alias_kind":"pith_short_12","alias_value":"3VJXJMRBECVU","created_at":"2026-07-05T03:48:08Z"},{"alias_kind":"pith_short_16","alias_value":"3VJXJMRBECVUSAMM","created_at":"2026-07-05T03:48:08Z"},{"alias_kind":"pith_short_8","alias_value":"3VJXJMRB","created_at":"2026-07-05T03:48:08Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2021:3VJXJMRBECVUSAMME72VN5Q365","target":"record","payload":{"canonical_record":{"source":{"id":"2109.07654","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"cond-mat.supr-con","submitted_at":"2021-09-16T01:15:59Z","cross_cats_sorted":[],"title_canon_sha256":"7e26e4fbc1429731b95a593093cac17802469e16068784f8cebe444e8653df9b","abstract_canon_sha256":"dd30cfee5939c89635a55609b40b844643c7b753e8861cc7534ca43131a3d18a"},"schema_version":"1.0"},"canonical_sha256":"dd5374b22120ab49018c27f556f61bf778f1c3b85c7a67a94444971b679524c4","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T03:48:08.124406Z","signature_b64":"9vemeLzNeVLfVRGvq2qzbODT4Z7bhml2rdx2yykSI79NWYuebEdMcJPoPxPoOJ4J8S3Ap4XZrgrB1HogrqFCCA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"dd5374b22120ab49018c27f556f61bf778f1c3b85c7a67a94444971b679524c4","last_reissued_at":"2026-07-05T03:48:08.123910Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T03:48:08.123910Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2109.07654","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":"2026-07-05T03:48:08Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"gKdGfVIVRQfd2RYc2vKjb51JvXFouAPFXW8+J8KBYPJSIJQe2NoFjxv+SaiJ+y7DSSnNcbj0s8pqmP9SLD6cAw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-22T08:50:04.035111Z"},"content_sha256":"fd47bd8a2dc64c7ecedfff2e7e59de1083420f0183c94f95ed5ce06adbd5c141","schema_version":"1.0","event_id":"sha256:fd47bd8a2dc64c7ecedfff2e7e59de1083420f0183c94f95ed5ce06adbd5c141"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2021:3VJXJMRBECVUSAMME72VN5Q365","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Superconductivity in nickel based 112 systems","license":"http://creativecommons.org/licenses/by/4.0/","headline":"","cross_cats":[],"primary_cat":"cond-mat.supr-con","authors_text":"Hai-Hu Wen, Qiangqiang Gu","submitted_at":"2021-09-16T01:15:59Z","abstract_excerpt":"Superconductivity has been discovered recently in nickel based 112 infinite thin films $R_{1-x}$A$_x$NiO$_2$ ($R$ = La, Nd, Pr and A = Sr, Ca). They are isostructural to the infinite-layer cuprate (Ca,Sr)CuO$_2$ and are supposed to have a formal Ni 3$d^9$ valence, thus providing a new platform to study the unconventional pairing mechanism of high-temperature superconductors. This important discovery immediately triggers a huge amount of innovative scientific curiosity in the field. In this paper, we try to give an overview of the recent research progress on the newly found superconducting nick"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2109.07654","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/2109.07654/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":"2026-07-05T03:48:08Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"Cs3YlK7PBMYYMP/SHLMIa2GaS45j/Sr7/LtIOX/pYqi66X7TwIGtCnLNHO2s6lWCKrYyPtXvMO1hW9NJ1oX1Cg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-22T08:50:04.035639Z"},"content_sha256":"07aa66b125f6c3186451181ea2a33dd6ce082481c8a5c79946eddbf0deda60ea","schema_version":"1.0","event_id":"sha256:07aa66b125f6c3186451181ea2a33dd6ce082481c8a5c79946eddbf0deda60ea"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/3VJXJMRBECVUSAMME72VN5Q365/bundle.json","state_url":"https://pith.science/pith/3VJXJMRBECVUSAMME72VN5Q365/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/3VJXJMRBECVUSAMME72VN5Q365/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":"2026-08-22T08:50:04Z","links":{"resolver":"https://pith.science/pith/3VJXJMRBECVUSAMME72VN5Q365","bundle":"https://pith.science/pith/3VJXJMRBECVUSAMME72VN5Q365/bundle.json","state":"https://pith.science/pith/3VJXJMRBECVUSAMME72VN5Q365/state.json","well_known_bundle":"https://pith.science/.well-known/pith/3VJXJMRBECVUSAMME72VN5Q365/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2021:3VJXJMRBECVUSAMME72VN5Q365","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":"dd30cfee5939c89635a55609b40b844643c7b753e8861cc7534ca43131a3d18a","cross_cats_sorted":[],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"cond-mat.supr-con","submitted_at":"2021-09-16T01:15:59Z","title_canon_sha256":"7e26e4fbc1429731b95a593093cac17802469e16068784f8cebe444e8653df9b"},"schema_version":"1.0","source":{"id":"2109.07654","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2109.07654","created_at":"2026-07-05T03:48:08Z"},{"alias_kind":"arxiv_version","alias_value":"2109.07654v1","created_at":"2026-07-05T03:48:08Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2109.07654","created_at":"2026-07-05T03:48:08Z"},{"alias_kind":"pith_short_12","alias_value":"3VJXJMRBECVU","created_at":"2026-07-05T03:48:08Z"},{"alias_kind":"pith_short_16","alias_value":"3VJXJMRBECVUSAMM","created_at":"2026-07-05T03:48:08Z"},{"alias_kind":"pith_short_8","alias_value":"3VJXJMRB","created_at":"2026-07-05T03:48:08Z"}],"graph_snapshots":[{"event_id":"sha256:07aa66b125f6c3186451181ea2a33dd6ce082481c8a5c79946eddbf0deda60ea","target":"graph","created_at":"2026-07-05T03:48:08Z","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/2109.07654/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"Superconductivity has been discovered recently in nickel based 112 infinite thin films $R_{1-x}$A$_x$NiO$_2$ ($R$ = La, Nd, Pr and A = Sr, Ca). They are isostructural to the infinite-layer cuprate (Ca,Sr)CuO$_2$ and are supposed to have a formal Ni 3$d^9$ valence, thus providing a new platform to study the unconventional pairing mechanism of high-temperature superconductors. This important discovery immediately triggers a huge amount of innovative scientific curiosity in the field. In this paper, we try to give an overview of the recent research progress on the newly found superconducting nick","authors_text":"Hai-Hu Wen, Qiangqiang Gu","cross_cats":[],"headline":"","license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"cond-mat.supr-con","submitted_at":"2021-09-16T01:15:59Z","title":"Superconductivity in nickel based 112 systems"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2109.07654","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:fd47bd8a2dc64c7ecedfff2e7e59de1083420f0183c94f95ed5ce06adbd5c141","target":"record","created_at":"2026-07-05T03:48:08Z","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":"dd30cfee5939c89635a55609b40b844643c7b753e8861cc7534ca43131a3d18a","cross_cats_sorted":[],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"cond-mat.supr-con","submitted_at":"2021-09-16T01:15:59Z","title_canon_sha256":"7e26e4fbc1429731b95a593093cac17802469e16068784f8cebe444e8653df9b"},"schema_version":"1.0","source":{"id":"2109.07654","kind":"arxiv","version":1}},"canonical_sha256":"dd5374b22120ab49018c27f556f61bf778f1c3b85c7a67a94444971b679524c4","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"dd5374b22120ab49018c27f556f61bf778f1c3b85c7a67a94444971b679524c4","first_computed_at":"2026-07-05T03:48:08.123910Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T03:48:08.123910Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"9vemeLzNeVLfVRGvq2qzbODT4Z7bhml2rdx2yykSI79NWYuebEdMcJPoPxPoOJ4J8S3Ap4XZrgrB1HogrqFCCA==","signature_status":"signed_v1","signed_at":"2026-07-05T03:48:08.124406Z","signed_message":"canonical_sha256_bytes"},"source_id":"2109.07654","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:fd47bd8a2dc64c7ecedfff2e7e59de1083420f0183c94f95ed5ce06adbd5c141","sha256:07aa66b125f6c3186451181ea2a33dd6ce082481c8a5c79946eddbf0deda60ea"],"state_sha256":"75fb42a7e970f832296d5e93226550b83d75a086a008fdc7623da8b9bc7bfc0c"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"nmmZe2+SuS+akr0G1oLIoyHFfQtzyEcxhpGjH3/Ja7vwmFYVoX8zOKJIJW5neXv37eMVR2NJL3KLzKLNUpBcAQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-22T08:50:04.039547Z","bundle_sha256":"c76d95d0ec5295e4fd9b992b6089409ee859c0151b8465afc909b3d2472214da"}}