{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2021:IZAIUJM4TKDJC4USGRBGXXXR5Q","short_pith_number":"pith:IZAIUJM4","canonical_record":{"source":{"id":"2109.07763","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"eess.SP","submitted_at":"2021-09-16T07:21:22Z","cross_cats_sorted":["cs.IT","math.IT"],"title_canon_sha256":"e32993f78bb04dd8cfba67cb4ba79a7c1dae5fa8655a67a09987e21b000f1622","abstract_canon_sha256":"be456ec308ac0506720d653037eeaf04e40e01552c2e29bc28dcf6db4e6f3e59"},"schema_version":"1.0"},"canonical_sha256":"46408a259c9a8691729234426bdef1ec3d19077ff45c70805816fac4ef53c101","source":{"kind":"arxiv","id":"2109.07763","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2109.07763","created_at":"2026-07-05T03:15:00Z"},{"alias_kind":"arxiv_version","alias_value":"2109.07763v1","created_at":"2026-07-05T03:15:00Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2109.07763","created_at":"2026-07-05T03:15:00Z"},{"alias_kind":"pith_short_12","alias_value":"IZAIUJM4TKDJ","created_at":"2026-07-05T03:15:00Z"},{"alias_kind":"pith_short_16","alias_value":"IZAIUJM4TKDJC4US","created_at":"2026-07-05T03:15:00Z"},{"alias_kind":"pith_short_8","alias_value":"IZAIUJM4","created_at":"2026-07-05T03:15:00Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2021:IZAIUJM4TKDJC4USGRBGXXXR5Q","target":"record","payload":{"canonical_record":{"source":{"id":"2109.07763","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"eess.SP","submitted_at":"2021-09-16T07:21:22Z","cross_cats_sorted":["cs.IT","math.IT"],"title_canon_sha256":"e32993f78bb04dd8cfba67cb4ba79a7c1dae5fa8655a67a09987e21b000f1622","abstract_canon_sha256":"be456ec308ac0506720d653037eeaf04e40e01552c2e29bc28dcf6db4e6f3e59"},"schema_version":"1.0"},"canonical_sha256":"46408a259c9a8691729234426bdef1ec3d19077ff45c70805816fac4ef53c101","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T03:15:00.920381Z","signature_b64":"wYAzYsEnFukQsJKcRfdfsVXSOZ6pJRjrBuC4t7zi0KYdwagCQEbb7ZIvJLQ9AtD2oAznafvfNYa2ufA8i7ekBQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"46408a259c9a8691729234426bdef1ec3d19077ff45c70805816fac4ef53c101","last_reissued_at":"2026-07-05T03:15:00.919923Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T03:15:00.919923Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2109.07763","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":"2026-07-05T03:15:00Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"mpyc1FAgYcUy/1wQ8qs2oTgCHK/kCUDM9Q7pqjgifoYDjjc5lubb6f+XkEn1nPWnup8vOc0zhRyOo78Cy+L+Ag==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-21T22:13:09.751066Z"},"content_sha256":"f4babd0bd2371eb19b62dab3dcf95984f46c8aa213a201a51ec797d1687bc3d3","schema_version":"1.0","event_id":"sha256:f4babd0bd2371eb19b62dab3dcf95984f46c8aa213a201a51ec797d1687bc3d3"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2021:IZAIUJM4TKDJC4USGRBGXXXR5Q","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Design and Evaluation of Reconfigurable Intelligent Surfaces in Real-World Environment","license":"http://creativecommons.org/licenses/by/4.0/","headline":"","cross_cats":["cs.IT","math.IT"],"primary_cat":"eess.SP","authors_text":"Aditya Shekhawat, Ahmed Alkhateeb, Anand Sengar, Anuj Modi, Arkajyoti Chang, Bharath Kashyap, Georgios C. Trichopoulos, Panagiotis Theofanopoulos, Sanjay Kumar, Tawfik Osman","submitted_at":"2021-09-16T07:21:22Z","abstract_excerpt":"Reconfigurable intelligent surfaces (RISs) have promising coverage and data rate gains for wireless communication systems in 5G and beyond. Prior work has mainly focused on analyzing the performance of these surfaces using computer simulations or lab-level prototypes. To draw accurate insights about the actual performance of these systems, this paper develops an RIS proof-of-concept prototype and extensively evaluates its potential gains in the field and under realistic wireless communication settings. In particular, a 160-element reconfigurable surface, operating at a 5.8GHz band, is first de"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2109.07763","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/2109.07763/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":"2026-07-05T03:15:00Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"K9gxMSMEI21ZXkHJZPkjv1fPhr77cbFHZm0WCEv0YzvQD4PiJBSpjuKAhBwUjRHWnC/2M1UPiXI2ZmpwhxhSBg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-21T22:13:09.751568Z"},"content_sha256":"92ced62aef0cb28347bb55a747f2cb09ade58f33ff5c9eb09c0a27c148afd48c","schema_version":"1.0","event_id":"sha256:92ced62aef0cb28347bb55a747f2cb09ade58f33ff5c9eb09c0a27c148afd48c"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/IZAIUJM4TKDJC4USGRBGXXXR5Q/bundle.json","state_url":"https://pith.science/pith/IZAIUJM4TKDJC4USGRBGXXXR5Q/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/IZAIUJM4TKDJC4USGRBGXXXR5Q/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":"2026-08-21T22:13:09Z","links":{"resolver":"https://pith.science/pith/IZAIUJM4TKDJC4USGRBGXXXR5Q","bundle":"https://pith.science/pith/IZAIUJM4TKDJC4USGRBGXXXR5Q/bundle.json","state":"https://pith.science/pith/IZAIUJM4TKDJC4USGRBGXXXR5Q/state.json","well_known_bundle":"https://pith.science/.well-known/pith/IZAIUJM4TKDJC4USGRBGXXXR5Q/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2021:IZAIUJM4TKDJC4USGRBGXXXR5Q","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":"be456ec308ac0506720d653037eeaf04e40e01552c2e29bc28dcf6db4e6f3e59","cross_cats_sorted":["cs.IT","math.IT"],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"eess.SP","submitted_at":"2021-09-16T07:21:22Z","title_canon_sha256":"e32993f78bb04dd8cfba67cb4ba79a7c1dae5fa8655a67a09987e21b000f1622"},"schema_version":"1.0","source":{"id":"2109.07763","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2109.07763","created_at":"2026-07-05T03:15:00Z"},{"alias_kind":"arxiv_version","alias_value":"2109.07763v1","created_at":"2026-07-05T03:15:00Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2109.07763","created_at":"2026-07-05T03:15:00Z"},{"alias_kind":"pith_short_12","alias_value":"IZAIUJM4TKDJ","created_at":"2026-07-05T03:15:00Z"},{"alias_kind":"pith_short_16","alias_value":"IZAIUJM4TKDJC4US","created_at":"2026-07-05T03:15:00Z"},{"alias_kind":"pith_short_8","alias_value":"IZAIUJM4","created_at":"2026-07-05T03:15:00Z"}],"graph_snapshots":[{"event_id":"sha256:92ced62aef0cb28347bb55a747f2cb09ade58f33ff5c9eb09c0a27c148afd48c","target":"graph","created_at":"2026-07-05T03:15:00Z","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/2109.07763/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"Reconfigurable intelligent surfaces (RISs) have promising coverage and data rate gains for wireless communication systems in 5G and beyond. Prior work has mainly focused on analyzing the performance of these surfaces using computer simulations or lab-level prototypes. To draw accurate insights about the actual performance of these systems, this paper develops an RIS proof-of-concept prototype and extensively evaluates its potential gains in the field and under realistic wireless communication settings. In particular, a 160-element reconfigurable surface, operating at a 5.8GHz band, is first de","authors_text":"Aditya Shekhawat, Ahmed Alkhateeb, Anand Sengar, Anuj Modi, Arkajyoti Chang, Bharath Kashyap, Georgios C. Trichopoulos, Panagiotis Theofanopoulos, Sanjay Kumar, Tawfik Osman","cross_cats":["cs.IT","math.IT"],"headline":"","license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"eess.SP","submitted_at":"2021-09-16T07:21:22Z","title":"Design and Evaluation of Reconfigurable Intelligent Surfaces in Real-World Environment"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2109.07763","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:f4babd0bd2371eb19b62dab3dcf95984f46c8aa213a201a51ec797d1687bc3d3","target":"record","created_at":"2026-07-05T03:15:00Z","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":"be456ec308ac0506720d653037eeaf04e40e01552c2e29bc28dcf6db4e6f3e59","cross_cats_sorted":["cs.IT","math.IT"],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"eess.SP","submitted_at":"2021-09-16T07:21:22Z","title_canon_sha256":"e32993f78bb04dd8cfba67cb4ba79a7c1dae5fa8655a67a09987e21b000f1622"},"schema_version":"1.0","source":{"id":"2109.07763","kind":"arxiv","version":1}},"canonical_sha256":"46408a259c9a8691729234426bdef1ec3d19077ff45c70805816fac4ef53c101","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"46408a259c9a8691729234426bdef1ec3d19077ff45c70805816fac4ef53c101","first_computed_at":"2026-07-05T03:15:00.919923Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T03:15:00.919923Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"wYAzYsEnFukQsJKcRfdfsVXSOZ6pJRjrBuC4t7zi0KYdwagCQEbb7ZIvJLQ9AtD2oAznafvfNYa2ufA8i7ekBQ==","signature_status":"signed_v1","signed_at":"2026-07-05T03:15:00.920381Z","signed_message":"canonical_sha256_bytes"},"source_id":"2109.07763","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:f4babd0bd2371eb19b62dab3dcf95984f46c8aa213a201a51ec797d1687bc3d3","sha256:92ced62aef0cb28347bb55a747f2cb09ade58f33ff5c9eb09c0a27c148afd48c"],"state_sha256":"793cba8e6360eed943075a9f905d63f13e0ad8a3c9eca28064e0202a57f29ef0"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"9+bmj/1ocQW45DAnub1ekuJxz0c8wsu8Yx385snRbVooWnj+BbTCKjXE5LOoOgZYVBTjgDWoVO0+NBExHACgBg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-21T22:13:09.756298Z","bundle_sha256":"8f7fcaf1f8e26258c29556c4ce841fc1d7b365425eff539aca5ac3a28259d06b"}}