{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2020:WPKCISZOKQDC5L5WBG5YQBHDVQ","short_pith_number":"pith:WPKCISZO","canonical_record":{"source":{"id":"2001.02871","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2020-01-09T07:49:05Z","cross_cats_sorted":[],"title_canon_sha256":"f6506b63f97ab87d4c7a991f8b804a73d2fe24651f855982b8752bf06e9d0328","abstract_canon_sha256":"daf1278ff72724085c4cd75c4a4e88fa1fe57bcbc79b3d12ae96610f80084bed"},"schema_version":"1.0"},"canonical_sha256":"b3d4244b2e54062eafb609bb8804e3ac19891a531f6f4462e5eae3cdec2286f8","source":{"kind":"arxiv","id":"2001.02871","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2001.02871","created_at":"2026-07-05T00:32:24Z"},{"alias_kind":"arxiv_version","alias_value":"2001.02871v1","created_at":"2026-07-05T00:32:24Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2001.02871","created_at":"2026-07-05T00:32:24Z"},{"alias_kind":"pith_short_12","alias_value":"WPKCISZOKQDC","created_at":"2026-07-05T00:32:24Z"},{"alias_kind":"pith_short_16","alias_value":"WPKCISZOKQDC5L5W","created_at":"2026-07-05T00:32:24Z"},{"alias_kind":"pith_short_8","alias_value":"WPKCISZO","created_at":"2026-07-05T00:32:24Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2020:WPKCISZOKQDC5L5WBG5YQBHDVQ","target":"record","payload":{"canonical_record":{"source":{"id":"2001.02871","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2020-01-09T07:49:05Z","cross_cats_sorted":[],"title_canon_sha256":"f6506b63f97ab87d4c7a991f8b804a73d2fe24651f855982b8752bf06e9d0328","abstract_canon_sha256":"daf1278ff72724085c4cd75c4a4e88fa1fe57bcbc79b3d12ae96610f80084bed"},"schema_version":"1.0"},"canonical_sha256":"b3d4244b2e54062eafb609bb8804e3ac19891a531f6f4462e5eae3cdec2286f8","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T00:32:24.424061Z","signature_b64":"YouOcQm4ZnfQpAfVCLHxoRYW1IPtuGhj773Jv0ImBxx19jNP7Si3FV6oTjDgbb5ku3EnsV1S7ESgHngV5QdcDg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"b3d4244b2e54062eafb609bb8804e3ac19891a531f6f4462e5eae3cdec2286f8","last_reissued_at":"2026-07-05T00:32:24.423644Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T00:32:24.423644Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2001.02871","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":"2026-07-05T00:32:24Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"fqL7Z/qltQP1EwHeCGMgqvPB2kWFs7zKCVJx3mItASbpwJYj7BxXxmGIiZ8Hl9Lng95PevMQoEg1zMjuhAxkAQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-03T16:33:59.051138Z"},"content_sha256":"5c3472f070b6d3f85be038d02f6e9a39e47e3ed074be5c8230b94137d25651a4","schema_version":"1.0","event_id":"sha256:5c3472f070b6d3f85be038d02f6e9a39e47e3ed074be5c8230b94137d25651a4"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2020:WPKCISZOKQDC5L5WBG5YQBHDVQ","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Changing the Phosphorus Allotrope from a Square Columnar Structure to a Planar Zigzag Nanoribbon by Increasing the Diameter of Carbon Nanotube Nanoreactors","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"cond-mat.mtrl-sci","authors_text":"Chengcheng Fu, Chuansheng Ma, Chun-Lin Jia, Dan Zhao, David Tomanek, Hongchu Du, Hongyang Huang, Jie Guan, Jinying Zhang, Lihui Zhang, Shixin Song, Xinluo Zhao, Yifan Zhang","submitted_at":"2020-01-09T07:49:05Z","abstract_excerpt":"Elemental phosphorus nanostructures are notorious for a large number of allotropes, which limits their usefulness as semiconductors. To limit this structural diversity, we synthesize selectively quasi-1D phosphorus nanostructures inside carbon nanotubes (CNTs) that act both as stable templates and nanoreactors. Whereas zigzag phosphorus nanoribbons form preferably in CNTs with an inner diameter exceeding 1.4 nm, a previously unknown square columnar structure of phosphorus is observed to form inside narrower nanotubes. Our findings are supported by electron microscopy and Raman spectroscopy obs"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2001.02871","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/2001.02871/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":"2026-07-05T00:32:24Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"5PTOeLy5DprDa2T3mb3Pzxuvp1xRLrDZX44EfZcf2PFYEf+SzNuZkI7UMoNdkJ7ND3nYP/VBUU7isM/+Wp/fAQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-03T16:33:59.052070Z"},"content_sha256":"dff62d2304a2e53ec7215a09220eff9323e05e4109fbdeafb8f7a41168a524fc","schema_version":"1.0","event_id":"sha256:dff62d2304a2e53ec7215a09220eff9323e05e4109fbdeafb8f7a41168a524fc"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/WPKCISZOKQDC5L5WBG5YQBHDVQ/bundle.json","state_url":"https://pith.science/pith/WPKCISZOKQDC5L5WBG5YQBHDVQ/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/WPKCISZOKQDC5L5WBG5YQBHDVQ/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":"2026-08-03T16:33:59Z","links":{"resolver":"https://pith.science/pith/WPKCISZOKQDC5L5WBG5YQBHDVQ","bundle":"https://pith.science/pith/WPKCISZOKQDC5L5WBG5YQBHDVQ/bundle.json","state":"https://pith.science/pith/WPKCISZOKQDC5L5WBG5YQBHDVQ/state.json","well_known_bundle":"https://pith.science/.well-known/pith/WPKCISZOKQDC5L5WBG5YQBHDVQ/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2020:WPKCISZOKQDC5L5WBG5YQBHDVQ","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":"daf1278ff72724085c4cd75c4a4e88fa1fe57bcbc79b3d12ae96610f80084bed","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2020-01-09T07:49:05Z","title_canon_sha256":"f6506b63f97ab87d4c7a991f8b804a73d2fe24651f855982b8752bf06e9d0328"},"schema_version":"1.0","source":{"id":"2001.02871","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2001.02871","created_at":"2026-07-05T00:32:24Z"},{"alias_kind":"arxiv_version","alias_value":"2001.02871v1","created_at":"2026-07-05T00:32:24Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2001.02871","created_at":"2026-07-05T00:32:24Z"},{"alias_kind":"pith_short_12","alias_value":"WPKCISZOKQDC","created_at":"2026-07-05T00:32:24Z"},{"alias_kind":"pith_short_16","alias_value":"WPKCISZOKQDC5L5W","created_at":"2026-07-05T00:32:24Z"},{"alias_kind":"pith_short_8","alias_value":"WPKCISZO","created_at":"2026-07-05T00:32:24Z"}],"graph_snapshots":[{"event_id":"sha256:dff62d2304a2e53ec7215a09220eff9323e05e4109fbdeafb8f7a41168a524fc","target":"graph","created_at":"2026-07-05T00:32:24Z","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/2001.02871/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"Elemental phosphorus nanostructures are notorious for a large number of allotropes, which limits their usefulness as semiconductors. To limit this structural diversity, we synthesize selectively quasi-1D phosphorus nanostructures inside carbon nanotubes (CNTs) that act both as stable templates and nanoreactors. Whereas zigzag phosphorus nanoribbons form preferably in CNTs with an inner diameter exceeding 1.4 nm, a previously unknown square columnar structure of phosphorus is observed to form inside narrower nanotubes. Our findings are supported by electron microscopy and Raman spectroscopy obs","authors_text":"Chengcheng Fu, Chuansheng Ma, Chun-Lin Jia, Dan Zhao, David Tomanek, Hongchu Du, Hongyang Huang, Jie Guan, Jinying Zhang, Lihui Zhang, Shixin Song, Xinluo Zhao, Yifan Zhang","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2020-01-09T07:49:05Z","title":"Changing the Phosphorus Allotrope from a Square Columnar Structure to a Planar Zigzag Nanoribbon by Increasing the Diameter of Carbon Nanotube Nanoreactors"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2001.02871","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":"sha256:5c3472f070b6d3f85be038d02f6e9a39e47e3ed074be5c8230b94137d25651a4","target":"record","created_at":"2026-07-05T00:32:24Z","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":"daf1278ff72724085c4cd75c4a4e88fa1fe57bcbc79b3d12ae96610f80084bed","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2020-01-09T07:49:05Z","title_canon_sha256":"f6506b63f97ab87d4c7a991f8b804a73d2fe24651f855982b8752bf06e9d0328"},"schema_version":"1.0","source":{"id":"2001.02871","kind":"arxiv","version":1}},"canonical_sha256":"b3d4244b2e54062eafb609bb8804e3ac19891a531f6f4462e5eae3cdec2286f8","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"b3d4244b2e54062eafb609bb8804e3ac19891a531f6f4462e5eae3cdec2286f8","first_computed_at":"2026-07-05T00:32:24.423644Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T00:32:24.423644Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"YouOcQm4ZnfQpAfVCLHxoRYW1IPtuGhj773Jv0ImBxx19jNP7Si3FV6oTjDgbb5ku3EnsV1S7ESgHngV5QdcDg==","signature_status":"signed_v1","signed_at":"2026-07-05T00:32:24.424061Z","signed_message":"canonical_sha256_bytes"},"source_id":"2001.02871","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:5c3472f070b6d3f85be038d02f6e9a39e47e3ed074be5c8230b94137d25651a4","sha256:dff62d2304a2e53ec7215a09220eff9323e05e4109fbdeafb8f7a41168a524fc"],"state_sha256":"50e746ce6c8c89ab8136439a434ff91fe3edfe06da643f007db434dbe46ae8f9"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"DWnwdmWoT/jDKscf61nMAWKwq/h3EbEyXTRx/FvuvkZ/gCEfMhYZbCqnjXoQF3FB0vtPHIctRKrgDRU0ttWnBg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-03T16:33:59.056448Z","bundle_sha256":"13edb9e5c3255a2ee10d8a11c8b295fe9d252a1f704884a8bbf9af6524c67f38"}}