{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2010:5VTWQM7PTV4HQNYVW2TWVEWTOU","short_pith_number":"pith:5VTWQM7P","canonical_record":{"source":{"id":"1009.4520","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.NI","submitted_at":"2010-09-23T05:27:44Z","cross_cats_sorted":[],"title_canon_sha256":"e6380697234953c869e0b9b66b4de270eba16da317f580330a1d455b2d200325","abstract_canon_sha256":"812d2f32e89bcc1e5a071619815fdc2a80f54ed5c860a03b389665cafaaf5df1"},"schema_version":"1.0"},"canonical_sha256":"ed676833ef9d78783715b6a76a92d37528169051b979255b41256fcd38003539","source":{"kind":"arxiv","id":"1009.4520","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1009.4520","created_at":"2026-05-18T04:40:19Z"},{"alias_kind":"arxiv_version","alias_value":"1009.4520v1","created_at":"2026-05-18T04:40:19Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1009.4520","created_at":"2026-05-18T04:40:19Z"},{"alias_kind":"pith_short_12","alias_value":"5VTWQM7PTV4H","created_at":"2026-05-18T12:26:04Z"},{"alias_kind":"pith_short_16","alias_value":"5VTWQM7PTV4HQNYV","created_at":"2026-05-18T12:26:04Z"},{"alias_kind":"pith_short_8","alias_value":"5VTWQM7P","created_at":"2026-05-18T12:26:04Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2010:5VTWQM7PTV4HQNYVW2TWVEWTOU","target":"record","payload":{"canonical_record":{"source":{"id":"1009.4520","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.NI","submitted_at":"2010-09-23T05:27:44Z","cross_cats_sorted":[],"title_canon_sha256":"e6380697234953c869e0b9b66b4de270eba16da317f580330a1d455b2d200325","abstract_canon_sha256":"812d2f32e89bcc1e5a071619815fdc2a80f54ed5c860a03b389665cafaaf5df1"},"schema_version":"1.0"},"canonical_sha256":"ed676833ef9d78783715b6a76a92d37528169051b979255b41256fcd38003539","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T04:40:19.812365Z","signature_b64":"SsAvkfdXFh0n/Ycin+jLi+puK1HnRtaeS3ebFVbbZSb2thkgvOuImzpA5+8cxSJvBTZD2dZCognUV4P91z96BA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"ed676833ef9d78783715b6a76a92d37528169051b979255b41256fcd38003539","last_reissued_at":"2026-05-18T04:40:19.811537Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T04:40:19.811537Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1009.4520","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":"2026-05-18T04:40:19Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"+haHCPfZ0hlVMz2eICXzn4dtAkNPRbVFDXx0SfQ8kUdne4Jan1QqRc1jvr5WB6g1okR/UcHYkG+eJ0UWFqOcCw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-09T00:47:54.086049Z"},"content_sha256":"cb84e004920b37afa3c004368d963244f3c2350d8b5f11c1a1a693e05a4f27e6","schema_version":"1.0","event_id":"sha256:cb84e004920b37afa3c004368d963244f3c2350d8b5f11c1a1a693e05a4f27e6"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2010:5VTWQM7PTV4HQNYVW2TWVEWTOU","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"An Energy Efficient Multichannel MAC Protocol for Cognitive Radio Ad Hoc Networks","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"cs.NI","authors_text":"S. M. Kamruzzaman","submitted_at":"2010-09-23T05:27:44Z","abstract_excerpt":"This paper presents a TDMA based energy efficient cognitive radio multichannel medium access control (MAC) protocol called ECR-MAC for wireless Ad Hoc Networks. ECR-MAC requires only a single half-duplex radio transceiver on each node that integrates the spectrum sensing at physical (PHY) layer and the packet scheduling at MAC layer. In addition to explicit frequency negotiation which is adopted by conventional multichannel MAC protocols, ECR-MAC introduces lightweight explicit time negotiation. This two-dimensional negotiation enables ECR-MAC to exploit the advantage of both multiple channels"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1009.4520","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":"2026-05-18T04:40:19Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"LgrJNrQYCYS3kaH0a5/eIeDx27UCCz+qpvtdgrytouJMn+lAJwGaK4o1VVEQTP0RaciTHZrh9f1jRald07mfBw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-09T00:47:54.086401Z"},"content_sha256":"4a0b6f7de3f2333e6f46a938d24900f1b099fc913dcabcd109a7b10b0417dc21","schema_version":"1.0","event_id":"sha256:4a0b6f7de3f2333e6f46a938d24900f1b099fc913dcabcd109a7b10b0417dc21"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/5VTWQM7PTV4HQNYVW2TWVEWTOU/bundle.json","state_url":"https://pith.science/pith/5VTWQM7PTV4HQNYVW2TWVEWTOU/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/5VTWQM7PTV4HQNYVW2TWVEWTOU/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":"2026-06-09T00:47:54Z","links":{"resolver":"https://pith.science/pith/5VTWQM7PTV4HQNYVW2TWVEWTOU","bundle":"https://pith.science/pith/5VTWQM7PTV4HQNYVW2TWVEWTOU/bundle.json","state":"https://pith.science/pith/5VTWQM7PTV4HQNYVW2TWVEWTOU/state.json","well_known_bundle":"https://pith.science/.well-known/pith/5VTWQM7PTV4HQNYVW2TWVEWTOU/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2010:5VTWQM7PTV4HQNYVW2TWVEWTOU","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":"812d2f32e89bcc1e5a071619815fdc2a80f54ed5c860a03b389665cafaaf5df1","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.NI","submitted_at":"2010-09-23T05:27:44Z","title_canon_sha256":"e6380697234953c869e0b9b66b4de270eba16da317f580330a1d455b2d200325"},"schema_version":"1.0","source":{"id":"1009.4520","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1009.4520","created_at":"2026-05-18T04:40:19Z"},{"alias_kind":"arxiv_version","alias_value":"1009.4520v1","created_at":"2026-05-18T04:40:19Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1009.4520","created_at":"2026-05-18T04:40:19Z"},{"alias_kind":"pith_short_12","alias_value":"5VTWQM7PTV4H","created_at":"2026-05-18T12:26:04Z"},{"alias_kind":"pith_short_16","alias_value":"5VTWQM7PTV4HQNYV","created_at":"2026-05-18T12:26:04Z"},{"alias_kind":"pith_short_8","alias_value":"5VTWQM7P","created_at":"2026-05-18T12:26:04Z"}],"graph_snapshots":[{"event_id":"sha256:4a0b6f7de3f2333e6f46a938d24900f1b099fc913dcabcd109a7b10b0417dc21","target":"graph","created_at":"2026-05-18T04:40:19Z","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":"This paper presents a TDMA based energy efficient cognitive radio multichannel medium access control (MAC) protocol called ECR-MAC for wireless Ad Hoc Networks. ECR-MAC requires only a single half-duplex radio transceiver on each node that integrates the spectrum sensing at physical (PHY) layer and the packet scheduling at MAC layer. In addition to explicit frequency negotiation which is adopted by conventional multichannel MAC protocols, ECR-MAC introduces lightweight explicit time negotiation. This two-dimensional negotiation enables ECR-MAC to exploit the advantage of both multiple channels","authors_text":"S. M. Kamruzzaman","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.NI","submitted_at":"2010-09-23T05:27:44Z","title":"An Energy Efficient Multichannel MAC Protocol for Cognitive Radio Ad Hoc Networks"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1009.4520","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:cb84e004920b37afa3c004368d963244f3c2350d8b5f11c1a1a693e05a4f27e6","target":"record","created_at":"2026-05-18T04:40:19Z","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":"812d2f32e89bcc1e5a071619815fdc2a80f54ed5c860a03b389665cafaaf5df1","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.NI","submitted_at":"2010-09-23T05:27:44Z","title_canon_sha256":"e6380697234953c869e0b9b66b4de270eba16da317f580330a1d455b2d200325"},"schema_version":"1.0","source":{"id":"1009.4520","kind":"arxiv","version":1}},"canonical_sha256":"ed676833ef9d78783715b6a76a92d37528169051b979255b41256fcd38003539","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"ed676833ef9d78783715b6a76a92d37528169051b979255b41256fcd38003539","first_computed_at":"2026-05-18T04:40:19.811537Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T04:40:19.811537Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"SsAvkfdXFh0n/Ycin+jLi+puK1HnRtaeS3ebFVbbZSb2thkgvOuImzpA5+8cxSJvBTZD2dZCognUV4P91z96BA==","signature_status":"signed_v1","signed_at":"2026-05-18T04:40:19.812365Z","signed_message":"canonical_sha256_bytes"},"source_id":"1009.4520","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:cb84e004920b37afa3c004368d963244f3c2350d8b5f11c1a1a693e05a4f27e6","sha256:4a0b6f7de3f2333e6f46a938d24900f1b099fc913dcabcd109a7b10b0417dc21"],"state_sha256":"81d966fc08183db69bc18b8ceed154518e94ef74df45fb578304871facbab15a"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"pzPPDt/KMogOwroCoZHdUoWvtBP/MWt5bMW35mGjq8QTo23LpVP1+irPhWmqrbPpmW8IQu1M3hLZZ5fV8G8JCg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-09T00:47:54.089217Z","bundle_sha256":"f8faf1db5accdb498439d845acf5007dd4fd775720000c667964c64d3c1656b7"}}