{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2017:PPSCA35BVSEXYR272GX3PIW2RY","short_pith_number":"pith:PPSCA35B","canonical_record":{"source":{"id":"1708.07801","kind":"arxiv","version":4},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"stat.CO","submitted_at":"2017-08-25T16:31:49Z","cross_cats_sorted":["math.PR"],"title_canon_sha256":"2e8fd2b69c5113a3064f3c0baa00f319edab2c1132c1b3eec5a6e8b88d36d19c","abstract_canon_sha256":"f3ebed69f87bffc523f3593d9caffac7dd3c8e78b0a12b2576af98a1dac8b2d1"},"schema_version":"1.0"},"canonical_sha256":"7be4206fa1ac897c475fd1afb7a2da8e1cb5588c2bdf977ecf4e2212bd5b7407","source":{"kind":"arxiv","id":"1708.07801","version":4},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1708.07801","created_at":"2026-05-17T23:51:00Z"},{"alias_kind":"arxiv_version","alias_value":"1708.07801v4","created_at":"2026-05-17T23:51:00Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1708.07801","created_at":"2026-05-17T23:51:00Z"},{"alias_kind":"pith_short_12","alias_value":"PPSCA35BVSEX","created_at":"2026-05-18T12:31:37Z"},{"alias_kind":"pith_short_16","alias_value":"PPSCA35BVSEXYR27","created_at":"2026-05-18T12:31:37Z"},{"alias_kind":"pith_short_8","alias_value":"PPSCA35B","created_at":"2026-05-18T12:31:37Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2017:PPSCA35BVSEXYR272GX3PIW2RY","target":"record","payload":{"canonical_record":{"source":{"id":"1708.07801","kind":"arxiv","version":4},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"stat.CO","submitted_at":"2017-08-25T16:31:49Z","cross_cats_sorted":["math.PR"],"title_canon_sha256":"2e8fd2b69c5113a3064f3c0baa00f319edab2c1132c1b3eec5a6e8b88d36d19c","abstract_canon_sha256":"f3ebed69f87bffc523f3593d9caffac7dd3c8e78b0a12b2576af98a1dac8b2d1"},"schema_version":"1.0"},"canonical_sha256":"7be4206fa1ac897c475fd1afb7a2da8e1cb5588c2bdf977ecf4e2212bd5b7407","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-17T23:51:00.187858Z","signature_b64":"qHd5u8q1GUZHOEqkPI0HWOcfXbs1ZthG9a21He3IWGCbZmwwcOmdw0pwvCkV02c4QPxAJbCIbVwscKaT4WKhAg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"7be4206fa1ac897c475fd1afb7a2da8e1cb5588c2bdf977ecf4e2212bd5b7407","last_reissued_at":"2026-05-17T23:51:00.187296Z","signature_status":"signed_v1","first_computed_at":"2026-05-17T23:51:00.187296Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1708.07801","source_version":4,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-17T23:51:00Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"2nhCyp95P/c8brhrsK44rd12j7KbjDaYrx1j0z8AyLPVgGRlq4tkK0I3iRpJPbQZzdctlvXUPAX1jTtoVzDCCA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-26T15:19:05.368495Z"},"content_sha256":"b6e44db369ef721d21734094fc7f683f4460f8038698ba41c95aedda6d45139f","schema_version":"1.0","event_id":"sha256:b6e44db369ef721d21734094fc7f683f4460f8038698ba41c95aedda6d45139f"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2017:PPSCA35BVSEXYR272GX3PIW2RY","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Nudging the particle filter","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["math.PR"],"primary_cat":"stat.CO","authors_text":"Joaqu\\'in M\\'iguez, \\\"Omer Deniz Aky{\\i}ld{\\i}z","submitted_at":"2017-08-25T16:31:49Z","abstract_excerpt":"We investigate a new sampling scheme aimed at improving the performance of particle filters whenever (a) there is a significant mismatch between the assumed model dynamics and the actual system, or (b) the posterior probability tends to concentrate in relatively small regions of the state space. The proposed scheme pushes some particles towards specific regions where the likelihood is expected to be high, an operation known as nudging in the geophysics literature. We re-interpret nudging in a form applicable to any particle filtering scheme, as it does not involve any changes in the rest of th"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1708.07801","kind":"arxiv","version":4},"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":"2026-05-17T23:51:00Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"cxlUxlJjlha05XwHbKm1jbfyEVHhZr9icywxuFVsUn6rO8VvqbHldS7FFOAKIm7t2gBzzM6tEVVf4GjdTHAdBA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-26T15:19:05.369066Z"},"content_sha256":"b5bfd82e10fa605a18d8205b08b3c0d84a1b74412ef31ab2c6ac1305ecbf1368","schema_version":"1.0","event_id":"sha256:b5bfd82e10fa605a18d8205b08b3c0d84a1b74412ef31ab2c6ac1305ecbf1368"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/PPSCA35BVSEXYR272GX3PIW2RY/bundle.json","state_url":"https://pith.science/pith/PPSCA35BVSEXYR272GX3PIW2RY/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/PPSCA35BVSEXYR272GX3PIW2RY/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":"2026-05-26T15:19:05Z","links":{"resolver":"https://pith.science/pith/PPSCA35BVSEXYR272GX3PIW2RY","bundle":"https://pith.science/pith/PPSCA35BVSEXYR272GX3PIW2RY/bundle.json","state":"https://pith.science/pith/PPSCA35BVSEXYR272GX3PIW2RY/state.json","well_known_bundle":"https://pith.science/.well-known/pith/PPSCA35BVSEXYR272GX3PIW2RY/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2017:PPSCA35BVSEXYR272GX3PIW2RY","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":"f3ebed69f87bffc523f3593d9caffac7dd3c8e78b0a12b2576af98a1dac8b2d1","cross_cats_sorted":["math.PR"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"stat.CO","submitted_at":"2017-08-25T16:31:49Z","title_canon_sha256":"2e8fd2b69c5113a3064f3c0baa00f319edab2c1132c1b3eec5a6e8b88d36d19c"},"schema_version":"1.0","source":{"id":"1708.07801","kind":"arxiv","version":4}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1708.07801","created_at":"2026-05-17T23:51:00Z"},{"alias_kind":"arxiv_version","alias_value":"1708.07801v4","created_at":"2026-05-17T23:51:00Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1708.07801","created_at":"2026-05-17T23:51:00Z"},{"alias_kind":"pith_short_12","alias_value":"PPSCA35BVSEX","created_at":"2026-05-18T12:31:37Z"},{"alias_kind":"pith_short_16","alias_value":"PPSCA35BVSEXYR27","created_at":"2026-05-18T12:31:37Z"},{"alias_kind":"pith_short_8","alias_value":"PPSCA35B","created_at":"2026-05-18T12:31:37Z"}],"graph_snapshots":[{"event_id":"sha256:b5bfd82e10fa605a18d8205b08b3c0d84a1b74412ef31ab2c6ac1305ecbf1368","target":"graph","created_at":"2026-05-17T23:51:00Z","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":"We investigate a new sampling scheme aimed at improving the performance of particle filters whenever (a) there is a significant mismatch between the assumed model dynamics and the actual system, or (b) the posterior probability tends to concentrate in relatively small regions of the state space. The proposed scheme pushes some particles towards specific regions where the likelihood is expected to be high, an operation known as nudging in the geophysics literature. We re-interpret nudging in a form applicable to any particle filtering scheme, as it does not involve any changes in the rest of th","authors_text":"Joaqu\\'in M\\'iguez, \\\"Omer Deniz Aky{\\i}ld{\\i}z","cross_cats":["math.PR"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"stat.CO","submitted_at":"2017-08-25T16:31:49Z","title":"Nudging the particle filter"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1708.07801","kind":"arxiv","version":4},"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:b6e44db369ef721d21734094fc7f683f4460f8038698ba41c95aedda6d45139f","target":"record","created_at":"2026-05-17T23:51:00Z","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":"f3ebed69f87bffc523f3593d9caffac7dd3c8e78b0a12b2576af98a1dac8b2d1","cross_cats_sorted":["math.PR"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"stat.CO","submitted_at":"2017-08-25T16:31:49Z","title_canon_sha256":"2e8fd2b69c5113a3064f3c0baa00f319edab2c1132c1b3eec5a6e8b88d36d19c"},"schema_version":"1.0","source":{"id":"1708.07801","kind":"arxiv","version":4}},"canonical_sha256":"7be4206fa1ac897c475fd1afb7a2da8e1cb5588c2bdf977ecf4e2212bd5b7407","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"7be4206fa1ac897c475fd1afb7a2da8e1cb5588c2bdf977ecf4e2212bd5b7407","first_computed_at":"2026-05-17T23:51:00.187296Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-17T23:51:00.187296Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"qHd5u8q1GUZHOEqkPI0HWOcfXbs1ZthG9a21He3IWGCbZmwwcOmdw0pwvCkV02c4QPxAJbCIbVwscKaT4WKhAg==","signature_status":"signed_v1","signed_at":"2026-05-17T23:51:00.187858Z","signed_message":"canonical_sha256_bytes"},"source_id":"1708.07801","source_kind":"arxiv","source_version":4}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:b6e44db369ef721d21734094fc7f683f4460f8038698ba41c95aedda6d45139f","sha256:b5bfd82e10fa605a18d8205b08b3c0d84a1b74412ef31ab2c6ac1305ecbf1368"],"state_sha256":"68a67da440473614b04088aa3321304d708b4e2455f9b5a5728a637c446df8dd"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"XUDbKfho3nnF81FSgNE/940va1V7SbM5Kf5XYqDpu7URg6+aglS8Nr7feECBwayDIEqtLibWyN7zoS13uhumAw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-26T15:19:05.372289Z","bundle_sha256":"8224c1d3c0a9f546f73b590ddc4aaa6d453d435ae2ee74b36093e35996c317ec"}}