{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2016:OX7LO6XWAA3LI2BX5LJHDLVMBS","short_pith_number":"pith:OX7LO6XW","canonical_record":{"source":{"id":"1611.06718","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.chem-ph","submitted_at":"2016-11-21T10:48:38Z","cross_cats_sorted":["cond-mat.mtrl-sci","physics.comp-ph"],"title_canon_sha256":"83703bde19932695bc99a7dd4bfb79ffd660c89aa749b9e46f709c0f393f23bd","abstract_canon_sha256":"73145edcfae3f042316887b971ade835a78a2e21bbd6822d8b937030b627f762"},"schema_version":"1.0"},"canonical_sha256":"75feb77af60036b46837ead271aeac0c86da7e8060fa7970b20aa88426a172dd","source":{"kind":"arxiv","id":"1611.06718","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1611.06718","created_at":"2026-05-18T00:55:48Z"},{"alias_kind":"arxiv_version","alias_value":"1611.06718v1","created_at":"2026-05-18T00:55:48Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1611.06718","created_at":"2026-05-18T00:55:48Z"},{"alias_kind":"pith_short_12","alias_value":"OX7LO6XWAA3L","created_at":"2026-05-18T12:30:36Z"},{"alias_kind":"pith_short_16","alias_value":"OX7LO6XWAA3LI2BX","created_at":"2026-05-18T12:30:36Z"},{"alias_kind":"pith_short_8","alias_value":"OX7LO6XW","created_at":"2026-05-18T12:30:36Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2016:OX7LO6XWAA3LI2BX5LJHDLVMBS","target":"record","payload":{"canonical_record":{"source":{"id":"1611.06718","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.chem-ph","submitted_at":"2016-11-21T10:48:38Z","cross_cats_sorted":["cond-mat.mtrl-sci","physics.comp-ph"],"title_canon_sha256":"83703bde19932695bc99a7dd4bfb79ffd660c89aa749b9e46f709c0f393f23bd","abstract_canon_sha256":"73145edcfae3f042316887b971ade835a78a2e21bbd6822d8b937030b627f762"},"schema_version":"1.0"},"canonical_sha256":"75feb77af60036b46837ead271aeac0c86da7e8060fa7970b20aa88426a172dd","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T00:55:48.336455Z","signature_b64":"hyC5zwzeeNXtxBDVLkWEtkuHJsPw7hETzQTP+xmoDJYOHZYNbsy0zgmvaSQZdT2zUcTmHaDn+Jz7vPN2t944AA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"75feb77af60036b46837ead271aeac0c86da7e8060fa7970b20aa88426a172dd","last_reissued_at":"2026-05-18T00:55:48.335944Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T00:55:48.335944Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1611.06718","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":"2026-05-18T00:55:48Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"GrxLm3oEdGBSiig/zZLhp3/Q0jbEGTQ6tOetax7zp/JR+4f9q66GXh6EwksjXu7kQDJVjy/EHhcbOFJxrGukBA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-25T16:08:10.481244Z"},"content_sha256":"e14ddb50b6a90b00e95fd2409c0b7c1af5863b7a6754f54d584525e0808140f5","schema_version":"1.0","event_id":"sha256:e14ddb50b6a90b00e95fd2409c0b7c1af5863b7a6754f54d584525e0808140f5"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2016:OX7LO6XWAA3LI2BX5LJHDLVMBS","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Evidence for Stable Square Ice from Quantum Monte Carlo","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["cond-mat.mtrl-sci","physics.comp-ph"],"primary_cat":"physics.chem-ph","authors_text":"Andrea Zen, Angelos Michaelides, Dario Alf\\`e, Jan Gerit Brandenburg, Ji Chen","submitted_at":"2016-11-21T10:48:38Z","abstract_excerpt":"Recent experiments on ice formed by water under nanoconfinement provide evidence for a two-dimensional (2D) `square ice' phase. However, the interpretation of the experiments has been questioned and the stability of square ice has become a matter of debate. Partially this is because the simulation approaches employed so far (force fields and density functional theory) struggle to accurately describe the very small energy differences between the relevant phases. Here we report a study of 2D ice using an accurate wave-function based electronic structure approach, namely Diffusion Monte Carlo (DM"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1611.06718","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":""},"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":"2026-05-18T00:55:48Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"BuQr2ZCdvyrN/bbWLG4f6phJrFGIBFKDwRUvM+oASePwTXrTdsR4D36ciUTIHBZh8qw0RnGqbKImE5NWLqUyBg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-25T16:08:10.481875Z"},"content_sha256":"0a26bc5e09651e65a5bdd3e78254cea161bcbd74748a88dcee02edfa0989ee7c","schema_version":"1.0","event_id":"sha256:0a26bc5e09651e65a5bdd3e78254cea161bcbd74748a88dcee02edfa0989ee7c"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/OX7LO6XWAA3LI2BX5LJHDLVMBS/bundle.json","state_url":"https://pith.science/pith/OX7LO6XWAA3LI2BX5LJHDLVMBS/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/OX7LO6XWAA3LI2BX5LJHDLVMBS/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":"2026-05-25T16:08:10Z","links":{"resolver":"https://pith.science/pith/OX7LO6XWAA3LI2BX5LJHDLVMBS","bundle":"https://pith.science/pith/OX7LO6XWAA3LI2BX5LJHDLVMBS/bundle.json","state":"https://pith.science/pith/OX7LO6XWAA3LI2BX5LJHDLVMBS/state.json","well_known_bundle":"https://pith.science/.well-known/pith/OX7LO6XWAA3LI2BX5LJHDLVMBS/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2016:OX7LO6XWAA3LI2BX5LJHDLVMBS","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":"73145edcfae3f042316887b971ade835a78a2e21bbd6822d8b937030b627f762","cross_cats_sorted":["cond-mat.mtrl-sci","physics.comp-ph"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.chem-ph","submitted_at":"2016-11-21T10:48:38Z","title_canon_sha256":"83703bde19932695bc99a7dd4bfb79ffd660c89aa749b9e46f709c0f393f23bd"},"schema_version":"1.0","source":{"id":"1611.06718","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1611.06718","created_at":"2026-05-18T00:55:48Z"},{"alias_kind":"arxiv_version","alias_value":"1611.06718v1","created_at":"2026-05-18T00:55:48Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1611.06718","created_at":"2026-05-18T00:55:48Z"},{"alias_kind":"pith_short_12","alias_value":"OX7LO6XWAA3L","created_at":"2026-05-18T12:30:36Z"},{"alias_kind":"pith_short_16","alias_value":"OX7LO6XWAA3LI2BX","created_at":"2026-05-18T12:30:36Z"},{"alias_kind":"pith_short_8","alias_value":"OX7LO6XW","created_at":"2026-05-18T12:30:36Z"}],"graph_snapshots":[{"event_id":"sha256:0a26bc5e09651e65a5bdd3e78254cea161bcbd74748a88dcee02edfa0989ee7c","target":"graph","created_at":"2026-05-18T00:55:48Z","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":"Recent experiments on ice formed by water under nanoconfinement provide evidence for a two-dimensional (2D) `square ice' phase. However, the interpretation of the experiments has been questioned and the stability of square ice has become a matter of debate. Partially this is because the simulation approaches employed so far (force fields and density functional theory) struggle to accurately describe the very small energy differences between the relevant phases. Here we report a study of 2D ice using an accurate wave-function based electronic structure approach, namely Diffusion Monte Carlo (DM","authors_text":"Andrea Zen, Angelos Michaelides, Dario Alf\\`e, Jan Gerit Brandenburg, Ji Chen","cross_cats":["cond-mat.mtrl-sci","physics.comp-ph"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.chem-ph","submitted_at":"2016-11-21T10:48:38Z","title":"Evidence for Stable Square Ice from Quantum Monte Carlo"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1611.06718","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:e14ddb50b6a90b00e95fd2409c0b7c1af5863b7a6754f54d584525e0808140f5","target":"record","created_at":"2026-05-18T00:55:48Z","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":"73145edcfae3f042316887b971ade835a78a2e21bbd6822d8b937030b627f762","cross_cats_sorted":["cond-mat.mtrl-sci","physics.comp-ph"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.chem-ph","submitted_at":"2016-11-21T10:48:38Z","title_canon_sha256":"83703bde19932695bc99a7dd4bfb79ffd660c89aa749b9e46f709c0f393f23bd"},"schema_version":"1.0","source":{"id":"1611.06718","kind":"arxiv","version":1}},"canonical_sha256":"75feb77af60036b46837ead271aeac0c86da7e8060fa7970b20aa88426a172dd","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"75feb77af60036b46837ead271aeac0c86da7e8060fa7970b20aa88426a172dd","first_computed_at":"2026-05-18T00:55:48.335944Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:55:48.335944Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"hyC5zwzeeNXtxBDVLkWEtkuHJsPw7hETzQTP+xmoDJYOHZYNbsy0zgmvaSQZdT2zUcTmHaDn+Jz7vPN2t944AA==","signature_status":"signed_v1","signed_at":"2026-05-18T00:55:48.336455Z","signed_message":"canonical_sha256_bytes"},"source_id":"1611.06718","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:e14ddb50b6a90b00e95fd2409c0b7c1af5863b7a6754f54d584525e0808140f5","sha256:0a26bc5e09651e65a5bdd3e78254cea161bcbd74748a88dcee02edfa0989ee7c"],"state_sha256":"5b438ec5b39b1d1d1e1789bd3157d4364d409825f15845033e309c477e46abe0"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"0lJD+duIestUj0j2y2GoVWzjYOjKGAppjX9JilWCV0vTJb+2ByEnz7Mzh33YwmHYGjBttPV/KcMFB0XjOFpWCQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-25T16:08:10.485197Z","bundle_sha256":"eabae655692cd56ded0a07af4f21fc0b3dd9bb1f7126f75273a6939d8c2a81be"}}