{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2019:H2LYTSEEUYNEZC7UU4UBSPZBCV","short_pith_number":"pith:H2LYTSEE","canonical_record":{"source":{"id":"1908.07151","kind":"arxiv","version":3},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2019-08-20T03:52:32Z","cross_cats_sorted":["astro-ph.CO","astro-ph.EP","astro-ph.SR","stat.AP"],"title_canon_sha256":"9ad53ad61e876110c699c687335d7b71da0eb6b8174052569edca7729fdde5e9","abstract_canon_sha256":"0637ef33653fe236c3fa31ceb4e101742362c9f6bbafabf2c4c85b1d95bef8cd"},"schema_version":"1.0"},"canonical_sha256":"3e9789c884a61a4c8bf4a728193f2115669ae1fcad524baa7f8c82e56316d1d8","source":{"kind":"arxiv","id":"1908.07151","version":3},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1908.07151","created_at":"2026-07-05T03:52:22Z"},{"alias_kind":"arxiv_version","alias_value":"1908.07151v3","created_at":"2026-07-05T03:52:22Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1908.07151","created_at":"2026-07-05T03:52:22Z"},{"alias_kind":"pith_short_12","alias_value":"H2LYTSEEUYNE","created_at":"2026-07-05T03:52:22Z"},{"alias_kind":"pith_short_16","alias_value":"H2LYTSEEUYNEZC7U","created_at":"2026-07-05T03:52:22Z"},{"alias_kind":"pith_short_8","alias_value":"H2LYTSEE","created_at":"2026-07-05T03:52:22Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2019:H2LYTSEEUYNEZC7UU4UBSPZBCV","target":"record","payload":{"canonical_record":{"source":{"id":"1908.07151","kind":"arxiv","version":3},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2019-08-20T03:52:32Z","cross_cats_sorted":["astro-ph.CO","astro-ph.EP","astro-ph.SR","stat.AP"],"title_canon_sha256":"9ad53ad61e876110c699c687335d7b71da0eb6b8174052569edca7729fdde5e9","abstract_canon_sha256":"0637ef33653fe236c3fa31ceb4e101742362c9f6bbafabf2c4c85b1d95bef8cd"},"schema_version":"1.0"},"canonical_sha256":"3e9789c884a61a4c8bf4a728193f2115669ae1fcad524baa7f8c82e56316d1d8","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T03:52:22.961766Z","signature_b64":"VKFNx9FjF3GMm6ch89RiIc07F4/RN626y3tD3Uph6+O3ysgTWt8Cgyg09w6tenXGiia71Ka/uEUcMTqK6emYAw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"3e9789c884a61a4c8bf4a728193f2115669ae1fcad524baa7f8c82e56316d1d8","last_reissued_at":"2026-07-05T03:52:22.961270Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T03:52:22.961270Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1908.07151","source_version":3,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-07-05T03:52:22Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"OSlQ6PwsuZpa7wpL0jJEbgh41SWI1EtuSXZCjt3GZrZrj8nGntYuuRXA+pPgXsc3RY7zwDAjE6Q2nnNS3g6uBQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-16T13:09:36.379534Z"},"content_sha256":"161ed62a6e63edbeeb152e8408e9aa414e5dcb967fdddfe9ec3097a7da875bf5","schema_version":"1.0","event_id":"sha256:161ed62a6e63edbeeb152e8408e9aa414e5dcb967fdddfe9ec3097a7da875bf5"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2019:H2LYTSEEUYNEZC7UU4UBSPZBCV","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Trend Filtering -- I. A Modern Statistical Tool for Time-Domain Astronomy and Astronomical Spectroscopy","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.CO","astro-ph.EP","astro-ph.SR","stat.AP"],"primary_cat":"astro-ph.IM","authors_text":"Collin A. Politsch, Jessi Cisewski-Kehe, Larry Wasserman, Rupert A. C. Croft","submitted_at":"2019-08-20T03:52:32Z","abstract_excerpt":"The problem of denoising a one-dimensional signal possessing varying degrees of smoothness is ubiquitous in time-domain astronomy and astronomical spectroscopy. For example, in the time domain, an astronomical object may exhibit a smoothly varying intensity that is occasionally interrupted by abrupt dips or spikes. Likewise, in the spectroscopic setting, a noiseless spectrum typically contains intervals of relative smoothness mixed with localized higher frequency components such as emission peaks and absorption lines. In this work, we present trend filtering, a modern nonparametric statistical"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1908.07151","kind":"arxiv","version":3},"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/1908.07151/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":"2026-07-05T03:52:22Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"QQWTAfs0Eabe3fIznIggTZL+6RtlSmpNCbzTX2/G54aE4/t/NvKpfHZhWjCQrCrT0FxqQrIqziy4OpNI/Bz4AA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-16T13:09:36.380333Z"},"content_sha256":"ce5ea7d8b8fd786cf07cb2b96a22dcb447251318a2564e5fe941f54ac1443033","schema_version":"1.0","event_id":"sha256:ce5ea7d8b8fd786cf07cb2b96a22dcb447251318a2564e5fe941f54ac1443033"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/H2LYTSEEUYNEZC7UU4UBSPZBCV/bundle.json","state_url":"https://pith.science/pith/H2LYTSEEUYNEZC7UU4UBSPZBCV/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/H2LYTSEEUYNEZC7UU4UBSPZBCV/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":"2026-08-16T13:09:36Z","links":{"resolver":"https://pith.science/pith/H2LYTSEEUYNEZC7UU4UBSPZBCV","bundle":"https://pith.science/pith/H2LYTSEEUYNEZC7UU4UBSPZBCV/bundle.json","state":"https://pith.science/pith/H2LYTSEEUYNEZC7UU4UBSPZBCV/state.json","well_known_bundle":"https://pith.science/.well-known/pith/H2LYTSEEUYNEZC7UU4UBSPZBCV/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2019:H2LYTSEEUYNEZC7UU4UBSPZBCV","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":"0637ef33653fe236c3fa31ceb4e101742362c9f6bbafabf2c4c85b1d95bef8cd","cross_cats_sorted":["astro-ph.CO","astro-ph.EP","astro-ph.SR","stat.AP"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2019-08-20T03:52:32Z","title_canon_sha256":"9ad53ad61e876110c699c687335d7b71da0eb6b8174052569edca7729fdde5e9"},"schema_version":"1.0","source":{"id":"1908.07151","kind":"arxiv","version":3}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1908.07151","created_at":"2026-07-05T03:52:22Z"},{"alias_kind":"arxiv_version","alias_value":"1908.07151v3","created_at":"2026-07-05T03:52:22Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1908.07151","created_at":"2026-07-05T03:52:22Z"},{"alias_kind":"pith_short_12","alias_value":"H2LYTSEEUYNE","created_at":"2026-07-05T03:52:22Z"},{"alias_kind":"pith_short_16","alias_value":"H2LYTSEEUYNEZC7U","created_at":"2026-07-05T03:52:22Z"},{"alias_kind":"pith_short_8","alias_value":"H2LYTSEE","created_at":"2026-07-05T03:52:22Z"}],"graph_snapshots":[{"event_id":"sha256:ce5ea7d8b8fd786cf07cb2b96a22dcb447251318a2564e5fe941f54ac1443033","target":"graph","created_at":"2026-07-05T03:52:22Z","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/1908.07151/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"The problem of denoising a one-dimensional signal possessing varying degrees of smoothness is ubiquitous in time-domain astronomy and astronomical spectroscopy. For example, in the time domain, an astronomical object may exhibit a smoothly varying intensity that is occasionally interrupted by abrupt dips or spikes. Likewise, in the spectroscopic setting, a noiseless spectrum typically contains intervals of relative smoothness mixed with localized higher frequency components such as emission peaks and absorption lines. In this work, we present trend filtering, a modern nonparametric statistical","authors_text":"Collin A. Politsch, Jessi Cisewski-Kehe, Larry Wasserman, Rupert A. C. Croft","cross_cats":["astro-ph.CO","astro-ph.EP","astro-ph.SR","stat.AP"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2019-08-20T03:52:32Z","title":"Trend Filtering -- I. A Modern Statistical Tool for Time-Domain Astronomy and Astronomical Spectroscopy"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1908.07151","kind":"arxiv","version":3},"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":"sha256:161ed62a6e63edbeeb152e8408e9aa414e5dcb967fdddfe9ec3097a7da875bf5","target":"record","created_at":"2026-07-05T03:52:22Z","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":"0637ef33653fe236c3fa31ceb4e101742362c9f6bbafabf2c4c85b1d95bef8cd","cross_cats_sorted":["astro-ph.CO","astro-ph.EP","astro-ph.SR","stat.AP"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2019-08-20T03:52:32Z","title_canon_sha256":"9ad53ad61e876110c699c687335d7b71da0eb6b8174052569edca7729fdde5e9"},"schema_version":"1.0","source":{"id":"1908.07151","kind":"arxiv","version":3}},"canonical_sha256":"3e9789c884a61a4c8bf4a728193f2115669ae1fcad524baa7f8c82e56316d1d8","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"3e9789c884a61a4c8bf4a728193f2115669ae1fcad524baa7f8c82e56316d1d8","first_computed_at":"2026-07-05T03:52:22.961270Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T03:52:22.961270Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"VKFNx9FjF3GMm6ch89RiIc07F4/RN626y3tD3Uph6+O3ysgTWt8Cgyg09w6tenXGiia71Ka/uEUcMTqK6emYAw==","signature_status":"signed_v1","signed_at":"2026-07-05T03:52:22.961766Z","signed_message":"canonical_sha256_bytes"},"source_id":"1908.07151","source_kind":"arxiv","source_version":3}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:161ed62a6e63edbeeb152e8408e9aa414e5dcb967fdddfe9ec3097a7da875bf5","sha256:ce5ea7d8b8fd786cf07cb2b96a22dcb447251318a2564e5fe941f54ac1443033"],"state_sha256":"04d2e796ceadfb0efdbc9bb7132931055c9dd17e5291b8e65890eddaaa25e99c"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"p1EkMMIFe2/qHMBde1SE68adJGMZM7aVTXhP8ksojx13ACRy66reIiqmCGtxhFonmnj5lL5lozmBSNopOSDEDQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-16T13:09:36.387197Z","bundle_sha256":"a61cb595395e02633af04b0ca1092e96a99ff64d755753273baf7bff8747e7d5"}}