{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2021:UTPDPK4HWQPSWQTDXFJOZFA7XJ","short_pith_number":"pith:UTPDPK4H","canonical_record":{"source":{"id":"2104.05325","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.CR","submitted_at":"2021-04-12T10:10:43Z","cross_cats_sorted":[],"title_canon_sha256":"016914c2e42d5c05d6dbf9ce0d21fba62e861c02a8f011977f7d5c99988cc359","abstract_canon_sha256":"d19265edfaad43c94ea46314fd5dd79f3e4e8425bf9511639f22245fcac923c7"},"schema_version":"1.0"},"canonical_sha256":"a4de37ab87b41f2b4263b952ec941fba77d86de0a22193ec3277a7633b42e0ef","source":{"kind":"arxiv","id":"2104.05325","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2104.05325","created_at":"2026-07-05T02:31:11Z"},{"alias_kind":"arxiv_version","alias_value":"2104.05325v1","created_at":"2026-07-05T02:31:11Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2104.05325","created_at":"2026-07-05T02:31:11Z"},{"alias_kind":"pith_short_12","alias_value":"UTPDPK4HWQPS","created_at":"2026-07-05T02:31:11Z"},{"alias_kind":"pith_short_16","alias_value":"UTPDPK4HWQPSWQTD","created_at":"2026-07-05T02:31:11Z"},{"alias_kind":"pith_short_8","alias_value":"UTPDPK4H","created_at":"2026-07-05T02:31:11Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2021:UTPDPK4HWQPSWQTDXFJOZFA7XJ","target":"record","payload":{"canonical_record":{"source":{"id":"2104.05325","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.CR","submitted_at":"2021-04-12T10:10:43Z","cross_cats_sorted":[],"title_canon_sha256":"016914c2e42d5c05d6dbf9ce0d21fba62e861c02a8f011977f7d5c99988cc359","abstract_canon_sha256":"d19265edfaad43c94ea46314fd5dd79f3e4e8425bf9511639f22245fcac923c7"},"schema_version":"1.0"},"canonical_sha256":"a4de37ab87b41f2b4263b952ec941fba77d86de0a22193ec3277a7633b42e0ef","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T02:31:11.218096Z","signature_b64":"sv7x/GWQy2bmVNF4IM0KN9AFRNpcKjMCKjVQ1hgVLIv5aEPGpT+MN4U24g+biVW0MhqxrkwyYPC/p/JztbdcAQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"a4de37ab87b41f2b4263b952ec941fba77d86de0a22193ec3277a7633b42e0ef","last_reissued_at":"2026-07-05T02:31:11.217550Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T02:31:11.217550Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2104.05325","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":"2026-07-05T02:31:11Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"7118R9VWwUbXjM4osWnnqw2ygzKCDnOeQlMNp9XFGoqPH664paY4iKp/Z2nVzHu1PuER7Hb9i6alRr3NN2faAQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-07T04:39:26.523525Z"},"content_sha256":"694da8f123a963be30858a56446d1938c4a5dc5ec9e6de3feb1784ebeb0e5577","schema_version":"1.0","event_id":"sha256:694da8f123a963be30858a56446d1938c4a5dc5ec9e6de3feb1784ebeb0e5577"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2021:UTPDPK4HWQPSWQTDXFJOZFA7XJ","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Multi-level reversible encryption for ECG signals using compressive sensing","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"cs.CR","authors_text":"Jenni Raitoharju, Mehmet Yama\\c{c}, Mikko Impi\\\"o","submitted_at":"2021-04-12T10:10:43Z","abstract_excerpt":"Privacy concerns in healthcare have gained interest recently via GDPR, with a rising need for privacy-preserving data collection methods that keep personal information hidden in otherwise usable data. Sometimes data needs to be encrypted for several authentication levels, where a semi-authorized user gains access to data stripped of personal or sensitive information, while a fully-authorized user can recover the full signal. In this paper, we propose a compressive sensing based multi-level encryption to ECG signals to mask possible heartbeat anomalies from semi-authorized users, while preservi"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2104.05325","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/2104.05325/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":"2026-07-05T02:31:11Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"d4hm9ozRKH8TqPtuShNBw7gtxC5CC3SGJ9d9eMCEGiOeo1Zuk6OyoahBoplqVtRDWSXTctKdJSnyAoaB6BcSCw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-07T04:39:26.524172Z"},"content_sha256":"3bba526e2b95206914740d5f6eab1777d4d3e8d5191c51ca0394805c1992f38d","schema_version":"1.0","event_id":"sha256:3bba526e2b95206914740d5f6eab1777d4d3e8d5191c51ca0394805c1992f38d"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/UTPDPK4HWQPSWQTDXFJOZFA7XJ/bundle.json","state_url":"https://pith.science/pith/UTPDPK4HWQPSWQTDXFJOZFA7XJ/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/UTPDPK4HWQPSWQTDXFJOZFA7XJ/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":"2026-07-07T04:39:26Z","links":{"resolver":"https://pith.science/pith/UTPDPK4HWQPSWQTDXFJOZFA7XJ","bundle":"https://pith.science/pith/UTPDPK4HWQPSWQTDXFJOZFA7XJ/bundle.json","state":"https://pith.science/pith/UTPDPK4HWQPSWQTDXFJOZFA7XJ/state.json","well_known_bundle":"https://pith.science/.well-known/pith/UTPDPK4HWQPSWQTDXFJOZFA7XJ/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2021:UTPDPK4HWQPSWQTDXFJOZFA7XJ","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":"d19265edfaad43c94ea46314fd5dd79f3e4e8425bf9511639f22245fcac923c7","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.CR","submitted_at":"2021-04-12T10:10:43Z","title_canon_sha256":"016914c2e42d5c05d6dbf9ce0d21fba62e861c02a8f011977f7d5c99988cc359"},"schema_version":"1.0","source":{"id":"2104.05325","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2104.05325","created_at":"2026-07-05T02:31:11Z"},{"alias_kind":"arxiv_version","alias_value":"2104.05325v1","created_at":"2026-07-05T02:31:11Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2104.05325","created_at":"2026-07-05T02:31:11Z"},{"alias_kind":"pith_short_12","alias_value":"UTPDPK4HWQPS","created_at":"2026-07-05T02:31:11Z"},{"alias_kind":"pith_short_16","alias_value":"UTPDPK4HWQPSWQTD","created_at":"2026-07-05T02:31:11Z"},{"alias_kind":"pith_short_8","alias_value":"UTPDPK4H","created_at":"2026-07-05T02:31:11Z"}],"graph_snapshots":[{"event_id":"sha256:3bba526e2b95206914740d5f6eab1777d4d3e8d5191c51ca0394805c1992f38d","target":"graph","created_at":"2026-07-05T02:31:11Z","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/2104.05325/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"Privacy concerns in healthcare have gained interest recently via GDPR, with a rising need for privacy-preserving data collection methods that keep personal information hidden in otherwise usable data. Sometimes data needs to be encrypted for several authentication levels, where a semi-authorized user gains access to data stripped of personal or sensitive information, while a fully-authorized user can recover the full signal. In this paper, we propose a compressive sensing based multi-level encryption to ECG signals to mask possible heartbeat anomalies from semi-authorized users, while preservi","authors_text":"Jenni Raitoharju, Mehmet Yama\\c{c}, Mikko Impi\\\"o","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.CR","submitted_at":"2021-04-12T10:10:43Z","title":"Multi-level reversible encryption for ECG signals using compressive sensing"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2104.05325","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":"sha256:694da8f123a963be30858a56446d1938c4a5dc5ec9e6de3feb1784ebeb0e5577","target":"record","created_at":"2026-07-05T02:31:11Z","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":"d19265edfaad43c94ea46314fd5dd79f3e4e8425bf9511639f22245fcac923c7","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.CR","submitted_at":"2021-04-12T10:10:43Z","title_canon_sha256":"016914c2e42d5c05d6dbf9ce0d21fba62e861c02a8f011977f7d5c99988cc359"},"schema_version":"1.0","source":{"id":"2104.05325","kind":"arxiv","version":1}},"canonical_sha256":"a4de37ab87b41f2b4263b952ec941fba77d86de0a22193ec3277a7633b42e0ef","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"a4de37ab87b41f2b4263b952ec941fba77d86de0a22193ec3277a7633b42e0ef","first_computed_at":"2026-07-05T02:31:11.217550Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T02:31:11.217550Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"sv7x/GWQy2bmVNF4IM0KN9AFRNpcKjMCKjVQ1hgVLIv5aEPGpT+MN4U24g+biVW0MhqxrkwyYPC/p/JztbdcAQ==","signature_status":"signed_v1","signed_at":"2026-07-05T02:31:11.218096Z","signed_message":"canonical_sha256_bytes"},"source_id":"2104.05325","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:694da8f123a963be30858a56446d1938c4a5dc5ec9e6de3feb1784ebeb0e5577","sha256:3bba526e2b95206914740d5f6eab1777d4d3e8d5191c51ca0394805c1992f38d"],"state_sha256":"123c27ec93476b0203235735e6ce32b9ae375197386ce16a992e5cc694c981ee"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"HcKOpRNx0dBK3V1yc88+zlumwcxLPiqlZT1LOCPBA547hYx8de+DW4QlZD0nUn+QoUPsmWhyUDm0iiFCzgQ2AA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-07-07T04:39:26.527802Z","bundle_sha256":"0e9eb1914d0419dc29bb0c5aa1e26e65d2a88f51e8f57534fb12d5ddf79bace2"}}