{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2019:OBZUCRZWVHR35DCI3R5NVU6OUC","short_pith_number":"pith:OBZUCRZW","canonical_record":{"source":{"id":"1907.02518","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.NI","submitted_at":"2019-07-03T17:12:48Z","cross_cats_sorted":["cs.CR"],"title_canon_sha256":"7264c0aa0b1719bc76d31ac9eb02d852ff9934784691ada523b691a64a0b4a45","abstract_canon_sha256":"5ff4a8dd0def4edbd34eaa2608421c97ba62f8cd99dee3aadb6fdc3bbcf28ed6"},"schema_version":"1.0"},"canonical_sha256":"7073414736a9e3be8c48dc7adad3cea08f762ecd60ae73226fc01f14ca9fcfb7","source":{"kind":"arxiv","id":"1907.02518","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1907.02518","created_at":"2026-05-17T23:41:28Z"},{"alias_kind":"arxiv_version","alias_value":"1907.02518v1","created_at":"2026-05-17T23:41:28Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1907.02518","created_at":"2026-05-17T23:41:28Z"},{"alias_kind":"pith_short_12","alias_value":"OBZUCRZWVHR3","created_at":"2026-05-18T12:33:24Z"},{"alias_kind":"pith_short_16","alias_value":"OBZUCRZWVHR35DCI","created_at":"2026-05-18T12:33:24Z"},{"alias_kind":"pith_short_8","alias_value":"OBZUCRZW","created_at":"2026-05-18T12:33:24Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2019:OBZUCRZWVHR35DCI3R5NVU6OUC","target":"record","payload":{"canonical_record":{"source":{"id":"1907.02518","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.NI","submitted_at":"2019-07-03T17:12:48Z","cross_cats_sorted":["cs.CR"],"title_canon_sha256":"7264c0aa0b1719bc76d31ac9eb02d852ff9934784691ada523b691a64a0b4a45","abstract_canon_sha256":"5ff4a8dd0def4edbd34eaa2608421c97ba62f8cd99dee3aadb6fdc3bbcf28ed6"},"schema_version":"1.0"},"canonical_sha256":"7073414736a9e3be8c48dc7adad3cea08f762ecd60ae73226fc01f14ca9fcfb7","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-17T23:41:28.316134Z","signature_b64":"CuHsngvWyKYoMJS3nXw6OSdEqC3EzQxnLNqAwK1hkzdlwwF+R04OsOlaInsfpzdi0LA+3f0GTr6m+D6T0nWXDQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"7073414736a9e3be8c48dc7adad3cea08f762ecd60ae73226fc01f14ca9fcfb7","last_reissued_at":"2026-05-17T23:41:28.315368Z","signature_status":"signed_v1","first_computed_at":"2026-05-17T23:41:28.315368Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1907.02518","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":"2026-05-17T23:41:28Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"t8ahYpegsBcqPPGxEuJPCqfq8UOyT1GuzMTzWLczPbsREAISpQwnCGP0xoy9adO40MTYIRZ0kzedMjxtLrQhDQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-26T11:38:03.009887Z"},"content_sha256":"0f78ee317fdb47cea5eea31039be6ba4f448b2192ef8200718171b779fb1a907","schema_version":"1.0","event_id":"sha256:0f78ee317fdb47cea5eea31039be6ba4f448b2192ef8200718171b779fb1a907"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2019:OBZUCRZWVHR35DCI3R5NVU6OUC","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Location Privacy in Cognitive Radios with Multi-Server Private Information Retrieval","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["cs.CR"],"primary_cat":"cs.NI","authors_text":"Attila A. Yavuz, Bechir Hamdaoui, Mohamed Grissa","submitted_at":"2019-07-03T17:12:48Z","abstract_excerpt":"Spectrum database-based cognitive radio networks (CRNs) have become the de facto approach for enabling unlicensed secondary users (SUs) to identify spectrum vacancies in channels owned by licensed primary users (PUs). Despite its merits, the use of spectrum databases incurs privacy concerns for both SUs and PUs. Single-server private information retrieval (PIR) has been used as the main tool to address this problem. However, such techniques incur extremely large communication and computation overheads while offering only computational privacy. Besides, some of these PIR protocols have been bro"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1907.02518","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":"2026-05-17T23:41:28Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"iTasIcaYLpVtkNOtTjOiLNDGHMQzUx5QP9iKwufnFiavUChUx0Q2EeGlQKnxwxOzIC1rP8xJJ7aP2Fp0m8vYBw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-26T11:38:03.010268Z"},"content_sha256":"7fccc11dd1ff0cdae12211e374ee6aa4c499c16d11079bea3a1355b3fe103108","schema_version":"1.0","event_id":"sha256:7fccc11dd1ff0cdae12211e374ee6aa4c499c16d11079bea3a1355b3fe103108"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/OBZUCRZWVHR35DCI3R5NVU6OUC/bundle.json","state_url":"https://pith.science/pith/OBZUCRZWVHR35DCI3R5NVU6OUC/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/OBZUCRZWVHR35DCI3R5NVU6OUC/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":"2026-05-26T11:38:03Z","links":{"resolver":"https://pith.science/pith/OBZUCRZWVHR35DCI3R5NVU6OUC","bundle":"https://pith.science/pith/OBZUCRZWVHR35DCI3R5NVU6OUC/bundle.json","state":"https://pith.science/pith/OBZUCRZWVHR35DCI3R5NVU6OUC/state.json","well_known_bundle":"https://pith.science/.well-known/pith/OBZUCRZWVHR35DCI3R5NVU6OUC/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2019:OBZUCRZWVHR35DCI3R5NVU6OUC","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":"5ff4a8dd0def4edbd34eaa2608421c97ba62f8cd99dee3aadb6fdc3bbcf28ed6","cross_cats_sorted":["cs.CR"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.NI","submitted_at":"2019-07-03T17:12:48Z","title_canon_sha256":"7264c0aa0b1719bc76d31ac9eb02d852ff9934784691ada523b691a64a0b4a45"},"schema_version":"1.0","source":{"id":"1907.02518","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1907.02518","created_at":"2026-05-17T23:41:28Z"},{"alias_kind":"arxiv_version","alias_value":"1907.02518v1","created_at":"2026-05-17T23:41:28Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1907.02518","created_at":"2026-05-17T23:41:28Z"},{"alias_kind":"pith_short_12","alias_value":"OBZUCRZWVHR3","created_at":"2026-05-18T12:33:24Z"},{"alias_kind":"pith_short_16","alias_value":"OBZUCRZWVHR35DCI","created_at":"2026-05-18T12:33:24Z"},{"alias_kind":"pith_short_8","alias_value":"OBZUCRZW","created_at":"2026-05-18T12:33:24Z"}],"graph_snapshots":[{"event_id":"sha256:7fccc11dd1ff0cdae12211e374ee6aa4c499c16d11079bea3a1355b3fe103108","target":"graph","created_at":"2026-05-17T23:41:28Z","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":"Spectrum database-based cognitive radio networks (CRNs) have become the de facto approach for enabling unlicensed secondary users (SUs) to identify spectrum vacancies in channels owned by licensed primary users (PUs). Despite its merits, the use of spectrum databases incurs privacy concerns for both SUs and PUs. Single-server private information retrieval (PIR) has been used as the main tool to address this problem. However, such techniques incur extremely large communication and computation overheads while offering only computational privacy. Besides, some of these PIR protocols have been bro","authors_text":"Attila A. Yavuz, Bechir Hamdaoui, Mohamed Grissa","cross_cats":["cs.CR"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.NI","submitted_at":"2019-07-03T17:12:48Z","title":"Location Privacy in Cognitive Radios with Multi-Server Private Information Retrieval"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1907.02518","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":"sha256:0f78ee317fdb47cea5eea31039be6ba4f448b2192ef8200718171b779fb1a907","target":"record","created_at":"2026-05-17T23:41:28Z","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":"5ff4a8dd0def4edbd34eaa2608421c97ba62f8cd99dee3aadb6fdc3bbcf28ed6","cross_cats_sorted":["cs.CR"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.NI","submitted_at":"2019-07-03T17:12:48Z","title_canon_sha256":"7264c0aa0b1719bc76d31ac9eb02d852ff9934784691ada523b691a64a0b4a45"},"schema_version":"1.0","source":{"id":"1907.02518","kind":"arxiv","version":1}},"canonical_sha256":"7073414736a9e3be8c48dc7adad3cea08f762ecd60ae73226fc01f14ca9fcfb7","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"7073414736a9e3be8c48dc7adad3cea08f762ecd60ae73226fc01f14ca9fcfb7","first_computed_at":"2026-05-17T23:41:28.315368Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-17T23:41:28.315368Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"CuHsngvWyKYoMJS3nXw6OSdEqC3EzQxnLNqAwK1hkzdlwwF+R04OsOlaInsfpzdi0LA+3f0GTr6m+D6T0nWXDQ==","signature_status":"signed_v1","signed_at":"2026-05-17T23:41:28.316134Z","signed_message":"canonical_sha256_bytes"},"source_id":"1907.02518","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:0f78ee317fdb47cea5eea31039be6ba4f448b2192ef8200718171b779fb1a907","sha256:7fccc11dd1ff0cdae12211e374ee6aa4c499c16d11079bea3a1355b3fe103108"],"state_sha256":"5ee9fffbd882f5c66bd0ab441f18b47090674c9656283fcc892aa486c3b773a2"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"6xXrLPZGvbVkq4z1YmVlweCn1uxnqCy2iQMffNLA3cz1hpfz5aPnNLtuNc+XqoxmvXArIjKiGNVKx+fGvM3gDg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-26T11:38:03.013501Z","bundle_sha256":"921117a7928829fc3c449cfeeb844ae3a924bbea31b85fe8e3301de861ad49cd"}}