{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2009:NWWR4SAC7NOHXN47MEQNQTALTQ","short_pith_number":"pith:NWWR4SAC","canonical_record":{"source":{"id":"0906.3394","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.NI","submitted_at":"2009-06-18T09:54:20Z","cross_cats_sorted":["cs.DC"],"title_canon_sha256":"c6df79fd79e19d47255426954431090a8f89b5797d67e674e4c3930a8661b979","abstract_canon_sha256":"6d825a6cc7e4c490133e4cfb077c89ac9b6c4e6df2b3ac8687cbb3ca2e5ee672"},"schema_version":"1.0"},"canonical_sha256":"6dad1e4802fb5c7bb79f6120d84c0b9c322dc39aeb49ee4217ac7e0e09f378c7","source":{"kind":"arxiv","id":"0906.3394","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"0906.3394","created_at":"2026-05-18T00:58:20Z"},{"alias_kind":"arxiv_version","alias_value":"0906.3394v1","created_at":"2026-05-18T00:58:20Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.0906.3394","created_at":"2026-05-18T00:58:20Z"},{"alias_kind":"pith_short_12","alias_value":"NWWR4SAC7NOH","created_at":"2026-05-18T12:26:01Z"},{"alias_kind":"pith_short_16","alias_value":"NWWR4SAC7NOHXN47","created_at":"2026-05-18T12:26:01Z"},{"alias_kind":"pith_short_8","alias_value":"NWWR4SAC","created_at":"2026-05-18T12:26:01Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2009:NWWR4SAC7NOHXN47MEQNQTALTQ","target":"record","payload":{"canonical_record":{"source":{"id":"0906.3394","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.NI","submitted_at":"2009-06-18T09:54:20Z","cross_cats_sorted":["cs.DC"],"title_canon_sha256":"c6df79fd79e19d47255426954431090a8f89b5797d67e674e4c3930a8661b979","abstract_canon_sha256":"6d825a6cc7e4c490133e4cfb077c89ac9b6c4e6df2b3ac8687cbb3ca2e5ee672"},"schema_version":"1.0"},"canonical_sha256":"6dad1e4802fb5c7bb79f6120d84c0b9c322dc39aeb49ee4217ac7e0e09f378c7","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T00:58:20.107868Z","signature_b64":"3iuxYvkAupE3/GY4v8E0xxIJ06xVbE6STU/Rg4pLG7q4ePaNozLWsz2b3pqdpMsQihO0VzZ0gzJ+gYZbz42IAA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"6dad1e4802fb5c7bb79f6120d84c0b9c322dc39aeb49ee4217ac7e0e09f378c7","last_reissued_at":"2026-05-18T00:58:20.107200Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T00:58:20.107200Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"0906.3394","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":"2026-05-18T00:58:20Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"LmP0xyR/s02ESgDkrPbZ2wSSxe/p/8XHjWwAJmtixXeTVnAmq+6IhzUmH3mZsmgwmuS4EA4J6H6LsCVipl1FDw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-09T12:36:20.837453Z"},"content_sha256":"dac57ad3f307a73026bc74c9ea1df3e1b86aba88fb302e1545129a48a383e47b","schema_version":"1.0","event_id":"sha256:dac57ad3f307a73026bc74c9ea1df3e1b86aba88fb302e1545129a48a383e47b"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2009:NWWR4SAC7NOHXN47MEQNQTALTQ","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Quantifying the Availability of TV White Spaces for Cognitive Radio Operation in the UK","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["cs.DC"],"primary_cat":"cs.NI","authors_text":"Maziar Nekovee","submitted_at":"2009-06-18T09:54:20Z","abstract_excerpt":"Cognitive radio is being intensively researched for opportunistic access to the so-called TV White Spaces (TVWS): large portions of the VHF/UHF TV bands which become available on a geographical basis after the digital switchover. Using accurate digital TV (DTV) coverage maps together with a database of DTV transmitters, we develop a methodology for identifying TVWS frequencies at any given location in the United Kingdom. We use our methodology to investigate variations in TVWS as a function of the location and transmit power of cognitive radios, and examine how constraints on adjacent channel "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0906.3394","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":"2026-05-18T00:58:20Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"xoK7eNdntuY0y/Mou4awUPrRuAhKxhWiK4wZRSd+mNXb8LsJl/X0p2mLyWTrNHgZXr2ta9MkpcBdwfP/qiGcCw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-09T12:36:20.837800Z"},"content_sha256":"cae040364406f43c1eb9eca42c26e52298492d07d31c6e73692f80eecdc2ab15","schema_version":"1.0","event_id":"sha256:cae040364406f43c1eb9eca42c26e52298492d07d31c6e73692f80eecdc2ab15"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/NWWR4SAC7NOHXN47MEQNQTALTQ/bundle.json","state_url":"https://pith.science/pith/NWWR4SAC7NOHXN47MEQNQTALTQ/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/NWWR4SAC7NOHXN47MEQNQTALTQ/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":"2026-06-09T12:36:20Z","links":{"resolver":"https://pith.science/pith/NWWR4SAC7NOHXN47MEQNQTALTQ","bundle":"https://pith.science/pith/NWWR4SAC7NOHXN47MEQNQTALTQ/bundle.json","state":"https://pith.science/pith/NWWR4SAC7NOHXN47MEQNQTALTQ/state.json","well_known_bundle":"https://pith.science/.well-known/pith/NWWR4SAC7NOHXN47MEQNQTALTQ/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2009:NWWR4SAC7NOHXN47MEQNQTALTQ","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":"6d825a6cc7e4c490133e4cfb077c89ac9b6c4e6df2b3ac8687cbb3ca2e5ee672","cross_cats_sorted":["cs.DC"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.NI","submitted_at":"2009-06-18T09:54:20Z","title_canon_sha256":"c6df79fd79e19d47255426954431090a8f89b5797d67e674e4c3930a8661b979"},"schema_version":"1.0","source":{"id":"0906.3394","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"0906.3394","created_at":"2026-05-18T00:58:20Z"},{"alias_kind":"arxiv_version","alias_value":"0906.3394v1","created_at":"2026-05-18T00:58:20Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.0906.3394","created_at":"2026-05-18T00:58:20Z"},{"alias_kind":"pith_short_12","alias_value":"NWWR4SAC7NOH","created_at":"2026-05-18T12:26:01Z"},{"alias_kind":"pith_short_16","alias_value":"NWWR4SAC7NOHXN47","created_at":"2026-05-18T12:26:01Z"},{"alias_kind":"pith_short_8","alias_value":"NWWR4SAC","created_at":"2026-05-18T12:26:01Z"}],"graph_snapshots":[{"event_id":"sha256:cae040364406f43c1eb9eca42c26e52298492d07d31c6e73692f80eecdc2ab15","target":"graph","created_at":"2026-05-18T00:58:20Z","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":"Cognitive radio is being intensively researched for opportunistic access to the so-called TV White Spaces (TVWS): large portions of the VHF/UHF TV bands which become available on a geographical basis after the digital switchover. Using accurate digital TV (DTV) coverage maps together with a database of DTV transmitters, we develop a methodology for identifying TVWS frequencies at any given location in the United Kingdom. We use our methodology to investigate variations in TVWS as a function of the location and transmit power of cognitive radios, and examine how constraints on adjacent channel ","authors_text":"Maziar Nekovee","cross_cats":["cs.DC"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.NI","submitted_at":"2009-06-18T09:54:20Z","title":"Quantifying the Availability of TV White Spaces for Cognitive Radio Operation in the UK"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0906.3394","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:dac57ad3f307a73026bc74c9ea1df3e1b86aba88fb302e1545129a48a383e47b","target":"record","created_at":"2026-05-18T00:58:20Z","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":"6d825a6cc7e4c490133e4cfb077c89ac9b6c4e6df2b3ac8687cbb3ca2e5ee672","cross_cats_sorted":["cs.DC"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.NI","submitted_at":"2009-06-18T09:54:20Z","title_canon_sha256":"c6df79fd79e19d47255426954431090a8f89b5797d67e674e4c3930a8661b979"},"schema_version":"1.0","source":{"id":"0906.3394","kind":"arxiv","version":1}},"canonical_sha256":"6dad1e4802fb5c7bb79f6120d84c0b9c322dc39aeb49ee4217ac7e0e09f378c7","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"6dad1e4802fb5c7bb79f6120d84c0b9c322dc39aeb49ee4217ac7e0e09f378c7","first_computed_at":"2026-05-18T00:58:20.107200Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:58:20.107200Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"3iuxYvkAupE3/GY4v8E0xxIJ06xVbE6STU/Rg4pLG7q4ePaNozLWsz2b3pqdpMsQihO0VzZ0gzJ+gYZbz42IAA==","signature_status":"signed_v1","signed_at":"2026-05-18T00:58:20.107868Z","signed_message":"canonical_sha256_bytes"},"source_id":"0906.3394","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:dac57ad3f307a73026bc74c9ea1df3e1b86aba88fb302e1545129a48a383e47b","sha256:cae040364406f43c1eb9eca42c26e52298492d07d31c6e73692f80eecdc2ab15"],"state_sha256":"975a1a914752bef1f59e00f3e80d6275da6841e41e0fde04cb4a3d707b1ff8ec"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"AW0gYKrFchpPXLph9Yz8B3vgvsHLjiOKO7bSlhjTWnnNP1JMKSzGo1irswSaamkGlmxdg/tZUKrQeKTEmF+8CA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-09T12:36:20.839682Z","bundle_sha256":"545c6024674fde1c84aaf9489fbfab65c64e5dcea9f9f7e6343fe7583760b73c"}}