{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2021:57WYZ42HUEJ7HV2HLP44VG5MTS","short_pith_number":"pith:57WYZ42H","canonical_record":{"source":{"id":"2106.06428","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2021-06-11T14:35:33Z","cross_cats_sorted":[],"title_canon_sha256":"5c7dda504122f109a4a8e16fd0aacd6068e432b802711f997eee1a4847499ea4","abstract_canon_sha256":"d5fcfaf3133101d1a3d778bb5bf9afe05288a28e5ca6ee71e36813ce9c905203"},"schema_version":"1.0"},"canonical_sha256":"efed8cf347a113f3d7475bf9ca9bac9c9292122b7b89fb10c9ed0c8fec03a925","source":{"kind":"arxiv","id":"2106.06428","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2106.06428","created_at":"2026-07-05T02:48:29Z"},{"alias_kind":"arxiv_version","alias_value":"2106.06428v1","created_at":"2026-07-05T02:48:29Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2106.06428","created_at":"2026-07-05T02:48:29Z"},{"alias_kind":"pith_short_12","alias_value":"57WYZ42HUEJ7","created_at":"2026-07-05T02:48:29Z"},{"alias_kind":"pith_short_16","alias_value":"57WYZ42HUEJ7HV2H","created_at":"2026-07-05T02:48:29Z"},{"alias_kind":"pith_short_8","alias_value":"57WYZ42H","created_at":"2026-07-05T02:48:29Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2021:57WYZ42HUEJ7HV2HLP44VG5MTS","target":"record","payload":{"canonical_record":{"source":{"id":"2106.06428","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2021-06-11T14:35:33Z","cross_cats_sorted":[],"title_canon_sha256":"5c7dda504122f109a4a8e16fd0aacd6068e432b802711f997eee1a4847499ea4","abstract_canon_sha256":"d5fcfaf3133101d1a3d778bb5bf9afe05288a28e5ca6ee71e36813ce9c905203"},"schema_version":"1.0"},"canonical_sha256":"efed8cf347a113f3d7475bf9ca9bac9c9292122b7b89fb10c9ed0c8fec03a925","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T02:48:29.787508Z","signature_b64":"GRm4tW8vQ/cslutGuWwElnTcRC+UtdcJWmZTAE80Z2Xr7qkXBgrQgPE70iZKFLb/5EGlQAYVxJIdC+tHoSZlBQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"efed8cf347a113f3d7475bf9ca9bac9c9292122b7b89fb10c9ed0c8fec03a925","last_reissued_at":"2026-07-05T02:48:29.786972Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T02:48:29.786972Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2106.06428","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":"2026-07-05T02:48:29Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"V3m3rUWxpayEeOJRg23XUrfaGCvP7vXpN8xx7qYmNH+AQzgvmFHhonwNft8LEQ4UZ9BRujmwErsKl7LvzgynCg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-02T04:11:40.188406Z"},"content_sha256":"dfb1bfb4c6363842485edb286b0bc6dbfb3e9b26980bdaa5eb2b34a20d92b5d1","schema_version":"1.0","event_id":"sha256:dfb1bfb4c6363842485edb286b0bc6dbfb3e9b26980bdaa5eb2b34a20d92b5d1"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2021:57WYZ42HUEJ7HV2HLP44VG5MTS","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Polarimetric Properties of Blazars Caught by the WEBT","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.HE","authors_text":"Claudia M. Raiteri, Massimo Villata","submitted_at":"2021-06-11T14:35:33Z","abstract_excerpt":"Active galactic nuclei come in many varieties. A minority of them are radio-loud, and exhibit two opposite prominent plasma jets extending from the proximity of the supermassive black hole up to megaparsec distances. When one of the relativistic jets is oriented closely to the line of sight, its emission is Doppler beamed and these objects show extreme variability properties at all wavelengths. These are called \"blazars\". The unpredictable blazar variability, occurring on a continuous range of time-scales, from minutes to years, is most effectively investigated in a multi-wavelength context. G"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2106.06428","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/2106.06428/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":"2026-07-05T02:48:29Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"fn7ac4eC/c8bv84RgCcQwknlXKIW7iNIv5MY0LFfq3w5YHEyRvwgKE8msJRK12GnxKKwg8av+Fq2pBCpjN3bAg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-02T04:11:40.188924Z"},"content_sha256":"f3ef599355bf2c008426b70c9a89cdd194ce7b24cf9c8306fb5b255e8704199d","schema_version":"1.0","event_id":"sha256:f3ef599355bf2c008426b70c9a89cdd194ce7b24cf9c8306fb5b255e8704199d"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/57WYZ42HUEJ7HV2HLP44VG5MTS/bundle.json","state_url":"https://pith.science/pith/57WYZ42HUEJ7HV2HLP44VG5MTS/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/57WYZ42HUEJ7HV2HLP44VG5MTS/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":"2026-08-02T04:11:40Z","links":{"resolver":"https://pith.science/pith/57WYZ42HUEJ7HV2HLP44VG5MTS","bundle":"https://pith.science/pith/57WYZ42HUEJ7HV2HLP44VG5MTS/bundle.json","state":"https://pith.science/pith/57WYZ42HUEJ7HV2HLP44VG5MTS/state.json","well_known_bundle":"https://pith.science/.well-known/pith/57WYZ42HUEJ7HV2HLP44VG5MTS/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2021:57WYZ42HUEJ7HV2HLP44VG5MTS","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":"d5fcfaf3133101d1a3d778bb5bf9afe05288a28e5ca6ee71e36813ce9c905203","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2021-06-11T14:35:33Z","title_canon_sha256":"5c7dda504122f109a4a8e16fd0aacd6068e432b802711f997eee1a4847499ea4"},"schema_version":"1.0","source":{"id":"2106.06428","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2106.06428","created_at":"2026-07-05T02:48:29Z"},{"alias_kind":"arxiv_version","alias_value":"2106.06428v1","created_at":"2026-07-05T02:48:29Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2106.06428","created_at":"2026-07-05T02:48:29Z"},{"alias_kind":"pith_short_12","alias_value":"57WYZ42HUEJ7","created_at":"2026-07-05T02:48:29Z"},{"alias_kind":"pith_short_16","alias_value":"57WYZ42HUEJ7HV2H","created_at":"2026-07-05T02:48:29Z"},{"alias_kind":"pith_short_8","alias_value":"57WYZ42H","created_at":"2026-07-05T02:48:29Z"}],"graph_snapshots":[{"event_id":"sha256:f3ef599355bf2c008426b70c9a89cdd194ce7b24cf9c8306fb5b255e8704199d","target":"graph","created_at":"2026-07-05T02:48:29Z","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/2106.06428/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"Active galactic nuclei come in many varieties. A minority of them are radio-loud, and exhibit two opposite prominent plasma jets extending from the proximity of the supermassive black hole up to megaparsec distances. When one of the relativistic jets is oriented closely to the line of sight, its emission is Doppler beamed and these objects show extreme variability properties at all wavelengths. These are called \"blazars\". The unpredictable blazar variability, occurring on a continuous range of time-scales, from minutes to years, is most effectively investigated in a multi-wavelength context. G","authors_text":"Claudia M. Raiteri, Massimo Villata","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2021-06-11T14:35:33Z","title":"Polarimetric Properties of Blazars Caught by the WEBT"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2106.06428","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:dfb1bfb4c6363842485edb286b0bc6dbfb3e9b26980bdaa5eb2b34a20d92b5d1","target":"record","created_at":"2026-07-05T02:48:29Z","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":"d5fcfaf3133101d1a3d778bb5bf9afe05288a28e5ca6ee71e36813ce9c905203","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2021-06-11T14:35:33Z","title_canon_sha256":"5c7dda504122f109a4a8e16fd0aacd6068e432b802711f997eee1a4847499ea4"},"schema_version":"1.0","source":{"id":"2106.06428","kind":"arxiv","version":1}},"canonical_sha256":"efed8cf347a113f3d7475bf9ca9bac9c9292122b7b89fb10c9ed0c8fec03a925","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"efed8cf347a113f3d7475bf9ca9bac9c9292122b7b89fb10c9ed0c8fec03a925","first_computed_at":"2026-07-05T02:48:29.786972Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T02:48:29.786972Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"GRm4tW8vQ/cslutGuWwElnTcRC+UtdcJWmZTAE80Z2Xr7qkXBgrQgPE70iZKFLb/5EGlQAYVxJIdC+tHoSZlBQ==","signature_status":"signed_v1","signed_at":"2026-07-05T02:48:29.787508Z","signed_message":"canonical_sha256_bytes"},"source_id":"2106.06428","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:dfb1bfb4c6363842485edb286b0bc6dbfb3e9b26980bdaa5eb2b34a20d92b5d1","sha256:f3ef599355bf2c008426b70c9a89cdd194ce7b24cf9c8306fb5b255e8704199d"],"state_sha256":"7819c205073bb1e8998349e4ede2683e54476ad9cb4da1d0b1a11bd49915ccf7"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"pqPt1Dak+pe2L8izxuJU6MLarK69emPdkHdUdo2j7rve+0HzejhbCNjKhtIaQcvMXFcig/Rv7A0/YkrBhGpsDQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-02T04:11:40.192394Z","bundle_sha256":"386fd6e1f5705ec81857d273e7360585c9d03dfa94c206610ceaad408b2a1893"}}