{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2021:AXSJFB67Z4IWG4RW34OK6LJR3Q","short_pith_number":"pith:AXSJFB67","canonical_record":{"source":{"id":"2107.05609","kind":"arxiv","version":2},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"gr-qc","submitted_at":"2021-07-12T17:45:56Z","cross_cats_sorted":["astro-ph.HE"],"title_canon_sha256":"7f6d835fb3fbea56ff2262304af4c73fc3c638973300960832426844ed29ea3c","abstract_canon_sha256":"2324d2552f1670312048920f2647e52c7f8158192b62ea77f96b050e2c44f436"},"schema_version":"1.0"},"canonical_sha256":"05e49287dfcf11637236df1caf2d31dc25ef2bf035a6063e125a1fae8f5eba97","source":{"kind":"arxiv","id":"2107.05609","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2107.05609","created_at":"2026-07-05T02:57:56Z"},{"alias_kind":"arxiv_version","alias_value":"2107.05609v2","created_at":"2026-07-05T02:57:56Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2107.05609","created_at":"2026-07-05T02:57:56Z"},{"alias_kind":"pith_short_12","alias_value":"AXSJFB67Z4IW","created_at":"2026-07-05T02:57:56Z"},{"alias_kind":"pith_short_16","alias_value":"AXSJFB67Z4IWG4RW","created_at":"2026-07-05T02:57:56Z"},{"alias_kind":"pith_short_8","alias_value":"AXSJFB67","created_at":"2026-07-05T02:57:56Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2021:AXSJFB67Z4IWG4RW34OK6LJR3Q","target":"record","payload":{"canonical_record":{"source":{"id":"2107.05609","kind":"arxiv","version":2},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"gr-qc","submitted_at":"2021-07-12T17:45:56Z","cross_cats_sorted":["astro-ph.HE"],"title_canon_sha256":"7f6d835fb3fbea56ff2262304af4c73fc3c638973300960832426844ed29ea3c","abstract_canon_sha256":"2324d2552f1670312048920f2647e52c7f8158192b62ea77f96b050e2c44f436"},"schema_version":"1.0"},"canonical_sha256":"05e49287dfcf11637236df1caf2d31dc25ef2bf035a6063e125a1fae8f5eba97","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T02:57:56.219020Z","signature_b64":"X0NG3YW+Q8zExby+jJvA/LREgnx7odtW3vdZg0RJPi/bH2/KnH3AH6mvLMRhOLyaVNviNeMcNgLUdw611wWPCA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"05e49287dfcf11637236df1caf2d31dc25ef2bf035a6063e125a1fae8f5eba97","last_reissued_at":"2026-07-05T02:57:56.218584Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T02:57:56.218584Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2107.05609","source_version":2,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-07-05T02:57:56Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"85fhLsG+O9dtVGytG1DXDMzYyXcKHqs9N6nk/GlMG5qMTKSPsvq1CwtLHk6t5r7KSD0WgCC4kIwzO7SsTMqNBA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-10T16:28:31.764351Z"},"content_sha256":"085acc806333a033dd639c9718bccf32fefd75d938e64aa852814906f7c04b43","schema_version":"1.0","event_id":"sha256:085acc806333a033dd639c9718bccf32fefd75d938e64aa852814906f7c04b43"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2021:AXSJFB67Z4IWG4RW34OK6LJR3Q","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Analyzing black-hole ringdowns","license":"http://creativecommons.org/licenses/by/4.0/","headline":"","cross_cats":["astro-ph.HE"],"primary_cat":"gr-qc","authors_text":"Maximiliano Isi, Will M. Farr","submitted_at":"2021-07-12T17:45:56Z","abstract_excerpt":"A perturbed black hole rings down by emitting gravitational waves in tones with specific frequencies and durations. Such tones encode prized information about the geometry of the source spacetime and the fundamental nature of gravity, making the measurement of black hole ringdowns a key goal of gravitational wave astronomy. However, this task is plagued by technical challenges that invalidate the naive application of standard data analysis methods and complicate sensitivity projections. In this paper, we provide a comprehensive account of the formalism required to properly carry out ringdown a"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2107.05609","kind":"arxiv","version":2},"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/2107.05609/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":"2026-07-05T02:57:56Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"puus/6o+KijjElia9VHjCO7N8xi+zMwxkOkdmivM9l/c8Ino5obepADBD8KM/alHQrtx0Ccw7rWApkzcpbV8Dw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-10T16:28:31.764877Z"},"content_sha256":"e049754a8a756d119adf60a2b0da15b55403d89ae01ccb357e9314fd7b9b33da","schema_version":"1.0","event_id":"sha256:e049754a8a756d119adf60a2b0da15b55403d89ae01ccb357e9314fd7b9b33da"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/AXSJFB67Z4IWG4RW34OK6LJR3Q/bundle.json","state_url":"https://pith.science/pith/AXSJFB67Z4IWG4RW34OK6LJR3Q/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/AXSJFB67Z4IWG4RW34OK6LJR3Q/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":"2026-08-10T16:28:31Z","links":{"resolver":"https://pith.science/pith/AXSJFB67Z4IWG4RW34OK6LJR3Q","bundle":"https://pith.science/pith/AXSJFB67Z4IWG4RW34OK6LJR3Q/bundle.json","state":"https://pith.science/pith/AXSJFB67Z4IWG4RW34OK6LJR3Q/state.json","well_known_bundle":"https://pith.science/.well-known/pith/AXSJFB67Z4IWG4RW34OK6LJR3Q/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2021:AXSJFB67Z4IWG4RW34OK6LJR3Q","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":"2324d2552f1670312048920f2647e52c7f8158192b62ea77f96b050e2c44f436","cross_cats_sorted":["astro-ph.HE"],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"gr-qc","submitted_at":"2021-07-12T17:45:56Z","title_canon_sha256":"7f6d835fb3fbea56ff2262304af4c73fc3c638973300960832426844ed29ea3c"},"schema_version":"1.0","source":{"id":"2107.05609","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2107.05609","created_at":"2026-07-05T02:57:56Z"},{"alias_kind":"arxiv_version","alias_value":"2107.05609v2","created_at":"2026-07-05T02:57:56Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2107.05609","created_at":"2026-07-05T02:57:56Z"},{"alias_kind":"pith_short_12","alias_value":"AXSJFB67Z4IW","created_at":"2026-07-05T02:57:56Z"},{"alias_kind":"pith_short_16","alias_value":"AXSJFB67Z4IWG4RW","created_at":"2026-07-05T02:57:56Z"},{"alias_kind":"pith_short_8","alias_value":"AXSJFB67","created_at":"2026-07-05T02:57:56Z"}],"graph_snapshots":[{"event_id":"sha256:e049754a8a756d119adf60a2b0da15b55403d89ae01ccb357e9314fd7b9b33da","target":"graph","created_at":"2026-07-05T02:57:56Z","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/2107.05609/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"A perturbed black hole rings down by emitting gravitational waves in tones with specific frequencies and durations. Such tones encode prized information about the geometry of the source spacetime and the fundamental nature of gravity, making the measurement of black hole ringdowns a key goal of gravitational wave astronomy. However, this task is plagued by technical challenges that invalidate the naive application of standard data analysis methods and complicate sensitivity projections. In this paper, we provide a comprehensive account of the formalism required to properly carry out ringdown a","authors_text":"Maximiliano Isi, Will M. Farr","cross_cats":["astro-ph.HE"],"headline":"","license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"gr-qc","submitted_at":"2021-07-12T17:45:56Z","title":"Analyzing black-hole ringdowns"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2107.05609","kind":"arxiv","version":2},"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":"sha256:085acc806333a033dd639c9718bccf32fefd75d938e64aa852814906f7c04b43","target":"record","created_at":"2026-07-05T02:57:56Z","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":"2324d2552f1670312048920f2647e52c7f8158192b62ea77f96b050e2c44f436","cross_cats_sorted":["astro-ph.HE"],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"gr-qc","submitted_at":"2021-07-12T17:45:56Z","title_canon_sha256":"7f6d835fb3fbea56ff2262304af4c73fc3c638973300960832426844ed29ea3c"},"schema_version":"1.0","source":{"id":"2107.05609","kind":"arxiv","version":2}},"canonical_sha256":"05e49287dfcf11637236df1caf2d31dc25ef2bf035a6063e125a1fae8f5eba97","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"05e49287dfcf11637236df1caf2d31dc25ef2bf035a6063e125a1fae8f5eba97","first_computed_at":"2026-07-05T02:57:56.218584Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T02:57:56.218584Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"X0NG3YW+Q8zExby+jJvA/LREgnx7odtW3vdZg0RJPi/bH2/KnH3AH6mvLMRhOLyaVNviNeMcNgLUdw611wWPCA==","signature_status":"signed_v1","signed_at":"2026-07-05T02:57:56.219020Z","signed_message":"canonical_sha256_bytes"},"source_id":"2107.05609","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:085acc806333a033dd639c9718bccf32fefd75d938e64aa852814906f7c04b43","sha256:e049754a8a756d119adf60a2b0da15b55403d89ae01ccb357e9314fd7b9b33da"],"state_sha256":"ea55a60e730930d0d923c34f57d6e9d78362f180bb0e8666a55f1cf20995b70f"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"bmejAAERoBjzFb2o3ld/S5MFKCaNBD5nVOrX4vVyH1a2tSFBdQYxqD0POJhPG5M/Yoi5VZFpC9R4mbFRoOz3CQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-10T16:28:31.770783Z","bundle_sha256":"3ce53956eccb255e9a538e2d7877a986772108746500ed3394d6c15515dec4d3"}}