{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2024:YKDIO2QPYW7ZQ4AWIA6O7FLI5Y","short_pith_number":"pith:YKDIO2QP","canonical_record":{"source":{"id":"2410.03501","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"cs.IT","submitted_at":"2024-10-04T15:13:53Z","cross_cats_sorted":["eess.SP","math.IT"],"title_canon_sha256":"f5aaf5c48058f498bfb80fd127ed20e24aa76f05be5adabcb77bc66c8f67eb1b","abstract_canon_sha256":"d0c447c1256c7e7a7b83897da0adfc81adfa7165eb027d944820c0ace9130744"},"schema_version":"1.0"},"canonical_sha256":"c286876a0fc5bf987016403cef9568ee3285c67b344d41f41677d9e80b46f139","source":{"kind":"arxiv","id":"2410.03501","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2410.03501","created_at":"2026-07-05T09:16:02Z"},{"alias_kind":"arxiv_version","alias_value":"2410.03501v1","created_at":"2026-07-05T09:16:02Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2410.03501","created_at":"2026-07-05T09:16:02Z"},{"alias_kind":"pith_short_12","alias_value":"YKDIO2QPYW7Z","created_at":"2026-07-05T09:16:02Z"},{"alias_kind":"pith_short_16","alias_value":"YKDIO2QPYW7ZQ4AW","created_at":"2026-07-05T09:16:02Z"},{"alias_kind":"pith_short_8","alias_value":"YKDIO2QP","created_at":"2026-07-05T09:16:02Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2024:YKDIO2QPYW7ZQ4AWIA6O7FLI5Y","target":"record","payload":{"canonical_record":{"source":{"id":"2410.03501","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"cs.IT","submitted_at":"2024-10-04T15:13:53Z","cross_cats_sorted":["eess.SP","math.IT"],"title_canon_sha256":"f5aaf5c48058f498bfb80fd127ed20e24aa76f05be5adabcb77bc66c8f67eb1b","abstract_canon_sha256":"d0c447c1256c7e7a7b83897da0adfc81adfa7165eb027d944820c0ace9130744"},"schema_version":"1.0"},"canonical_sha256":"c286876a0fc5bf987016403cef9568ee3285c67b344d41f41677d9e80b46f139","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T09:16:02.035390Z","signature_b64":"ZvJKv9GQby27PmTEHiUY5XdDoLw+5R3E8msDd9fe4/7yBFWUbZJC2RfJrPnaD8I1ObcPuHh7aN4i2mnj8OeTBg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"c286876a0fc5bf987016403cef9568ee3285c67b344d41f41677d9e80b46f139","last_reissued_at":"2026-07-05T09:16:02.034932Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T09:16:02.034932Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2410.03501","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":"2026-07-05T09:16:02Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"mSb66emE5oWXfpx3txG4Sx4nEpNNxpTf26j2TKWyCQXRACIvyk+saApCu06rLNpTrV+XIWjMvLxzx4eV8e1kBA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-14T16:46:02.297558Z"},"content_sha256":"236d24a8584f4c2f50ca2d4aff45c8d996176d61fa7cd10d06371e4d95ec644f","schema_version":"1.0","event_id":"sha256:236d24a8584f4c2f50ca2d4aff45c8d996176d61fa7cd10d06371e4d95ec644f"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2024:YKDIO2QPYW7ZQ4AWIA6O7FLI5Y","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"CSI Acquisition in Cell-Free Massive MIMO Surveillance Systems","license":"http://creativecommons.org/licenses/by/4.0/","headline":"","cross_cats":["eess.SP","math.IT"],"primary_cat":"cs.IT","authors_text":"Hien Quoc Ngo, Isabella W. G. da Silva, Michail Matthaiou, Zahra Mobini","submitted_at":"2024-10-04T15:13:53Z","abstract_excerpt":"We consider a cell-free massive multiple-input multiple-output (CF-mMIMO) surveillance system, in which multiple multi-antenna monitoring nodes (MNs) are deployed in either observing or jamming mode to disrupt the communication between a multi-antenna untrusted pair. We propose a simple and effective channel state information (CSI) acquisition scheme at the MNs. Specifically, our approach leverages pilot signals in both the uplink and downlink phases of the untrusted link, coupled with minimum mean-squared error (MMSE) estimation. This enables the MNs to accurately estimate the effective chann"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2410.03501","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/2410.03501/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":"2026-07-05T09:16:02Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"XYDIfxTQ2Ys7OUPyPKTFNJklXDfBWibCUK7VPd7FYf/1Tvu1LOYUS99hKsVpPq+pXwrv6SbzIN3H+wGU3bdSBw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-14T16:46:02.299545Z"},"content_sha256":"915fd377480873e6e8a1f19ba5df10c8e69906b983b96e67a42a123bdc2bfc5f","schema_version":"1.0","event_id":"sha256:915fd377480873e6e8a1f19ba5df10c8e69906b983b96e67a42a123bdc2bfc5f"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/YKDIO2QPYW7ZQ4AWIA6O7FLI5Y/bundle.json","state_url":"https://pith.science/pith/YKDIO2QPYW7ZQ4AWIA6O7FLI5Y/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/YKDIO2QPYW7ZQ4AWIA6O7FLI5Y/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":"2026-08-14T16:46:02Z","links":{"resolver":"https://pith.science/pith/YKDIO2QPYW7ZQ4AWIA6O7FLI5Y","bundle":"https://pith.science/pith/YKDIO2QPYW7ZQ4AWIA6O7FLI5Y/bundle.json","state":"https://pith.science/pith/YKDIO2QPYW7ZQ4AWIA6O7FLI5Y/state.json","well_known_bundle":"https://pith.science/.well-known/pith/YKDIO2QPYW7ZQ4AWIA6O7FLI5Y/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2024:YKDIO2QPYW7ZQ4AWIA6O7FLI5Y","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":"d0c447c1256c7e7a7b83897da0adfc81adfa7165eb027d944820c0ace9130744","cross_cats_sorted":["eess.SP","math.IT"],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"cs.IT","submitted_at":"2024-10-04T15:13:53Z","title_canon_sha256":"f5aaf5c48058f498bfb80fd127ed20e24aa76f05be5adabcb77bc66c8f67eb1b"},"schema_version":"1.0","source":{"id":"2410.03501","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2410.03501","created_at":"2026-07-05T09:16:02Z"},{"alias_kind":"arxiv_version","alias_value":"2410.03501v1","created_at":"2026-07-05T09:16:02Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2410.03501","created_at":"2026-07-05T09:16:02Z"},{"alias_kind":"pith_short_12","alias_value":"YKDIO2QPYW7Z","created_at":"2026-07-05T09:16:02Z"},{"alias_kind":"pith_short_16","alias_value":"YKDIO2QPYW7ZQ4AW","created_at":"2026-07-05T09:16:02Z"},{"alias_kind":"pith_short_8","alias_value":"YKDIO2QP","created_at":"2026-07-05T09:16:02Z"}],"graph_snapshots":[{"event_id":"sha256:915fd377480873e6e8a1f19ba5df10c8e69906b983b96e67a42a123bdc2bfc5f","target":"graph","created_at":"2026-07-05T09:16:02Z","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/2410.03501/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"We consider a cell-free massive multiple-input multiple-output (CF-mMIMO) surveillance system, in which multiple multi-antenna monitoring nodes (MNs) are deployed in either observing or jamming mode to disrupt the communication between a multi-antenna untrusted pair. We propose a simple and effective channel state information (CSI) acquisition scheme at the MNs. Specifically, our approach leverages pilot signals in both the uplink and downlink phases of the untrusted link, coupled with minimum mean-squared error (MMSE) estimation. This enables the MNs to accurately estimate the effective chann","authors_text":"Hien Quoc Ngo, Isabella W. G. da Silva, Michail Matthaiou, Zahra Mobini","cross_cats":["eess.SP","math.IT"],"headline":"","license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"cs.IT","submitted_at":"2024-10-04T15:13:53Z","title":"CSI Acquisition in Cell-Free Massive MIMO Surveillance Systems"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2410.03501","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":"sha256:236d24a8584f4c2f50ca2d4aff45c8d996176d61fa7cd10d06371e4d95ec644f","target":"record","created_at":"2026-07-05T09:16:02Z","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":"d0c447c1256c7e7a7b83897da0adfc81adfa7165eb027d944820c0ace9130744","cross_cats_sorted":["eess.SP","math.IT"],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"cs.IT","submitted_at":"2024-10-04T15:13:53Z","title_canon_sha256":"f5aaf5c48058f498bfb80fd127ed20e24aa76f05be5adabcb77bc66c8f67eb1b"},"schema_version":"1.0","source":{"id":"2410.03501","kind":"arxiv","version":1}},"canonical_sha256":"c286876a0fc5bf987016403cef9568ee3285c67b344d41f41677d9e80b46f139","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"c286876a0fc5bf987016403cef9568ee3285c67b344d41f41677d9e80b46f139","first_computed_at":"2026-07-05T09:16:02.034932Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T09:16:02.034932Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"ZvJKv9GQby27PmTEHiUY5XdDoLw+5R3E8msDd9fe4/7yBFWUbZJC2RfJrPnaD8I1ObcPuHh7aN4i2mnj8OeTBg==","signature_status":"signed_v1","signed_at":"2026-07-05T09:16:02.035390Z","signed_message":"canonical_sha256_bytes"},"source_id":"2410.03501","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:236d24a8584f4c2f50ca2d4aff45c8d996176d61fa7cd10d06371e4d95ec644f","sha256:915fd377480873e6e8a1f19ba5df10c8e69906b983b96e67a42a123bdc2bfc5f"],"state_sha256":"de4dc72abd6c59e85c78b8bf1c41c8e1a8fcbd27dc089d7b79b3cb65a1815b7f"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"xTS9Vp1RFlinKspHpdryuHUVP2P33q8QVEuN/BwzTu2qoXCf5fnHYPU7LgS34FQKOmb8H2/xTvzatwNAz7hVBA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-14T16:46:02.310696Z","bundle_sha256":"6f3e7920688c230501c0dbf8ffafd3af5d356ef7b17320bb526819902aa967b5"}}