{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2021:DIUOJRLKWQBBWKGTQK23NENQAW","short_pith_number":"pith:DIUOJRLK","canonical_record":{"source":{"id":"2105.10406","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by-nc-sa/4.0/","primary_cat":"eess.SP","submitted_at":"2021-05-13T16:42:40Z","cross_cats_sorted":["physics.med-ph","stat.ME"],"title_canon_sha256":"66a16badaa1e3d4426bebf05f916b75d62d7d09c7e1b419cc2d4992cc2ad1cf2","abstract_canon_sha256":"4a5a4f7977ec2dd66e4c3362a033d312abbbe21605a64a61d9039adfe3b2175e"},"schema_version":"1.0"},"canonical_sha256":"1a28e4c56ab4021b28d382b5b691b0058b368d1c9624ea2e81508ef512f631da","source":{"kind":"arxiv","id":"2105.10406","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2105.10406","created_at":"2026-07-05T02:42:11Z"},{"alias_kind":"arxiv_version","alias_value":"2105.10406v1","created_at":"2026-07-05T02:42:11Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2105.10406","created_at":"2026-07-05T02:42:11Z"},{"alias_kind":"pith_short_12","alias_value":"DIUOJRLKWQBB","created_at":"2026-07-05T02:42:11Z"},{"alias_kind":"pith_short_16","alias_value":"DIUOJRLKWQBBWKGT","created_at":"2026-07-05T02:42:11Z"},{"alias_kind":"pith_short_8","alias_value":"DIUOJRLK","created_at":"2026-07-05T02:42:11Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2021:DIUOJRLKWQBBWKGTQK23NENQAW","target":"record","payload":{"canonical_record":{"source":{"id":"2105.10406","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by-nc-sa/4.0/","primary_cat":"eess.SP","submitted_at":"2021-05-13T16:42:40Z","cross_cats_sorted":["physics.med-ph","stat.ME"],"title_canon_sha256":"66a16badaa1e3d4426bebf05f916b75d62d7d09c7e1b419cc2d4992cc2ad1cf2","abstract_canon_sha256":"4a5a4f7977ec2dd66e4c3362a033d312abbbe21605a64a61d9039adfe3b2175e"},"schema_version":"1.0"},"canonical_sha256":"1a28e4c56ab4021b28d382b5b691b0058b368d1c9624ea2e81508ef512f631da","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T02:42:11.132398Z","signature_b64":"ssMv+E5j26AzXpaOTRl/E8b5Hde/A8MBLedmil6lGDZwETpKtJPfG7GafhKjou9/0MZih0US1rvnYVl6fQIcCw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"1a28e4c56ab4021b28d382b5b691b0058b368d1c9624ea2e81508ef512f631da","last_reissued_at":"2026-07-05T02:42:11.131930Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T02:42:11.131930Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2105.10406","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":"2026-07-05T02:42:11Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"JeVKuuX+e9JXDIQGws/dzTc8nfh1/5BkLZO5m2FQw5Y5337nIkcR/fXWryRj0EnjKCVrvIivKGCW0Naz1jFdBg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-15T12:24:04.932607Z"},"content_sha256":"3e3c689d278cdbcd2ad713bb1142f71dff9a8ad938d9ab631f073a0af54baef6","schema_version":"1.0","event_id":"sha256:3e3c689d278cdbcd2ad713bb1142f71dff9a8ad938d9ab631f073a0af54baef6"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2021:DIUOJRLKWQBBWKGTQK23NENQAW","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Dyadic aggregated autoregressive (DASAR) model for time-frequency representation of biomedical signals","license":"http://creativecommons.org/licenses/by-nc-sa/4.0/","headline":"","cross_cats":["physics.med-ph","stat.ME"],"primary_cat":"eess.SP","authors_text":"Habib Sherkat, Hugo L. Hammer, Marco A. Pinto-Orellana, Peyman Mirtaheri","submitted_at":"2021-05-13T16:42:40Z","abstract_excerpt":"This paper introduces a new time-frequency representation method for biomedical signals: the dyadic aggregated autoregressive (DASAR) model. Signals, such as electroencephalograms (EEGs) and functional near-infrared spectroscopy (fNIRS), exhibit physiological information through time-evolving spectrum components at specific frequency intervals: 0-50 Hz (EEG) or 0-150 mHz (fNIRS). Spectrotemporal features in signals are conventionally estimated using short-time Fourier transform (STFT) and wavelet transform (WT). However, both methods may not offer the most robust or compact representation desp"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2105.10406","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/2105.10406/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":"2026-07-05T02:42:11Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"EDRyUEDJkF5dHUPxQhOej+nI3OF6aVU7L3WwoBSftZRNyrJ+fiF4hxGNpaPU6OK+z8Fa61LBY6vjhT4ghNSICA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-15T12:24:04.933088Z"},"content_sha256":"911b2de323dafc56f1ac5ef839de73d3d59c40703554c925925bbc2059f21ff9","schema_version":"1.0","event_id":"sha256:911b2de323dafc56f1ac5ef839de73d3d59c40703554c925925bbc2059f21ff9"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/DIUOJRLKWQBBWKGTQK23NENQAW/bundle.json","state_url":"https://pith.science/pith/DIUOJRLKWQBBWKGTQK23NENQAW/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/DIUOJRLKWQBBWKGTQK23NENQAW/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":"2026-08-15T12:24:04Z","links":{"resolver":"https://pith.science/pith/DIUOJRLKWQBBWKGTQK23NENQAW","bundle":"https://pith.science/pith/DIUOJRLKWQBBWKGTQK23NENQAW/bundle.json","state":"https://pith.science/pith/DIUOJRLKWQBBWKGTQK23NENQAW/state.json","well_known_bundle":"https://pith.science/.well-known/pith/DIUOJRLKWQBBWKGTQK23NENQAW/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2021:DIUOJRLKWQBBWKGTQK23NENQAW","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":"4a5a4f7977ec2dd66e4c3362a033d312abbbe21605a64a61d9039adfe3b2175e","cross_cats_sorted":["physics.med-ph","stat.ME"],"license":"http://creativecommons.org/licenses/by-nc-sa/4.0/","primary_cat":"eess.SP","submitted_at":"2021-05-13T16:42:40Z","title_canon_sha256":"66a16badaa1e3d4426bebf05f916b75d62d7d09c7e1b419cc2d4992cc2ad1cf2"},"schema_version":"1.0","source":{"id":"2105.10406","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2105.10406","created_at":"2026-07-05T02:42:11Z"},{"alias_kind":"arxiv_version","alias_value":"2105.10406v1","created_at":"2026-07-05T02:42:11Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2105.10406","created_at":"2026-07-05T02:42:11Z"},{"alias_kind":"pith_short_12","alias_value":"DIUOJRLKWQBB","created_at":"2026-07-05T02:42:11Z"},{"alias_kind":"pith_short_16","alias_value":"DIUOJRLKWQBBWKGT","created_at":"2026-07-05T02:42:11Z"},{"alias_kind":"pith_short_8","alias_value":"DIUOJRLK","created_at":"2026-07-05T02:42:11Z"}],"graph_snapshots":[{"event_id":"sha256:911b2de323dafc56f1ac5ef839de73d3d59c40703554c925925bbc2059f21ff9","target":"graph","created_at":"2026-07-05T02:42:11Z","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/2105.10406/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"This paper introduces a new time-frequency representation method for biomedical signals: the dyadic aggregated autoregressive (DASAR) model. Signals, such as electroencephalograms (EEGs) and functional near-infrared spectroscopy (fNIRS), exhibit physiological information through time-evolving spectrum components at specific frequency intervals: 0-50 Hz (EEG) or 0-150 mHz (fNIRS). Spectrotemporal features in signals are conventionally estimated using short-time Fourier transform (STFT) and wavelet transform (WT). However, both methods may not offer the most robust or compact representation desp","authors_text":"Habib Sherkat, Hugo L. Hammer, Marco A. Pinto-Orellana, Peyman Mirtaheri","cross_cats":["physics.med-ph","stat.ME"],"headline":"","license":"http://creativecommons.org/licenses/by-nc-sa/4.0/","primary_cat":"eess.SP","submitted_at":"2021-05-13T16:42:40Z","title":"Dyadic aggregated autoregressive (DASAR) model for time-frequency representation of biomedical signals"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2105.10406","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":"sha256:3e3c689d278cdbcd2ad713bb1142f71dff9a8ad938d9ab631f073a0af54baef6","target":"record","created_at":"2026-07-05T02:42:11Z","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":"4a5a4f7977ec2dd66e4c3362a033d312abbbe21605a64a61d9039adfe3b2175e","cross_cats_sorted":["physics.med-ph","stat.ME"],"license":"http://creativecommons.org/licenses/by-nc-sa/4.0/","primary_cat":"eess.SP","submitted_at":"2021-05-13T16:42:40Z","title_canon_sha256":"66a16badaa1e3d4426bebf05f916b75d62d7d09c7e1b419cc2d4992cc2ad1cf2"},"schema_version":"1.0","source":{"id":"2105.10406","kind":"arxiv","version":1}},"canonical_sha256":"1a28e4c56ab4021b28d382b5b691b0058b368d1c9624ea2e81508ef512f631da","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"1a28e4c56ab4021b28d382b5b691b0058b368d1c9624ea2e81508ef512f631da","first_computed_at":"2026-07-05T02:42:11.131930Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T02:42:11.131930Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"ssMv+E5j26AzXpaOTRl/E8b5Hde/A8MBLedmil6lGDZwETpKtJPfG7GafhKjou9/0MZih0US1rvnYVl6fQIcCw==","signature_status":"signed_v1","signed_at":"2026-07-05T02:42:11.132398Z","signed_message":"canonical_sha256_bytes"},"source_id":"2105.10406","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:3e3c689d278cdbcd2ad713bb1142f71dff9a8ad938d9ab631f073a0af54baef6","sha256:911b2de323dafc56f1ac5ef839de73d3d59c40703554c925925bbc2059f21ff9"],"state_sha256":"2596248890ff75148a6816150e31d6d299bde36fa8898c5467bf7963f84125c7"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"qGfydPSf0OPTPNzfOKBjAQ9OZnHiPlhdRAbIfESi8DfFnp8wDVXvBzNNTwf1jrotb9jrggbTT7+ddhkME+hpDQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-15T12:24:04.936640Z","bundle_sha256":"2fb4409d8cbb531f82d6936972ecddf5564060cb1147ad9b9963e9afd8e21dca"}}