{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2019:SIPTGOSXDZZDOQ6LJF5TLNREYQ","short_pith_number":"pith:SIPTGOSX","canonical_record":{"source":{"id":"1908.03085","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2019-08-08T14:04:08Z","cross_cats_sorted":[],"title_canon_sha256":"3633c68aa2a63e4b6907b64b44deb3abcabe617440234bb3e86b4db3856f8501","abstract_canon_sha256":"293e711502232fd464a1f1f49f892b2ef2bcf879c7a02ecf3f2f49584f4317fa"},"schema_version":"1.0"},"canonical_sha256":"921f333a571e723743cb497b35b624c43b4fa696968a324b10ba818f38609406","source":{"kind":"arxiv","id":"1908.03085","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1908.03085","created_at":"2026-07-04T23:52:26Z"},{"alias_kind":"arxiv_version","alias_value":"1908.03085v1","created_at":"2026-07-04T23:52:26Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1908.03085","created_at":"2026-07-04T23:52:26Z"},{"alias_kind":"pith_short_12","alias_value":"SIPTGOSXDZZD","created_at":"2026-07-04T23:52:26Z"},{"alias_kind":"pith_short_16","alias_value":"SIPTGOSXDZZDOQ6L","created_at":"2026-07-04T23:52:26Z"},{"alias_kind":"pith_short_8","alias_value":"SIPTGOSX","created_at":"2026-07-04T23:52:26Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2019:SIPTGOSXDZZDOQ6LJF5TLNREYQ","target":"record","payload":{"canonical_record":{"source":{"id":"1908.03085","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2019-08-08T14:04:08Z","cross_cats_sorted":[],"title_canon_sha256":"3633c68aa2a63e4b6907b64b44deb3abcabe617440234bb3e86b4db3856f8501","abstract_canon_sha256":"293e711502232fd464a1f1f49f892b2ef2bcf879c7a02ecf3f2f49584f4317fa"},"schema_version":"1.0"},"canonical_sha256":"921f333a571e723743cb497b35b624c43b4fa696968a324b10ba818f38609406","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-04T23:52:26.022627Z","signature_b64":"RnM7q6AMHlCbekI2SD/r7qfJSL2+L67CnOBKzCV/waKk2pftqB7ooueCZbrNsZ3L7BeZ+DM7FTmK04xjdy0cDw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"921f333a571e723743cb497b35b624c43b4fa696968a324b10ba818f38609406","last_reissued_at":"2026-07-04T23:52:26.022216Z","signature_status":"signed_v1","first_computed_at":"2026-07-04T23:52:26.022216Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1908.03085","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":"2026-07-04T23:52:26Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"qadlZw6MOMtHTDrkqkhDdRb/qMZLalAYmwg7z7iuZWD6fv9FDEAOEVh7i8kZLuxZuNiEu67gzU2I8Si6rjHKAA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-16T16:33:04.616820Z"},"content_sha256":"b5cc64eff6c9a4ce801c21108f72894c040b92a2bc1ba504b33a6e7f48ae50d0","schema_version":"1.0","event_id":"sha256:b5cc64eff6c9a4ce801c21108f72894c040b92a2bc1ba504b33a6e7f48ae50d0"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2019:SIPTGOSXDZZDOQ6LJF5TLNREYQ","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Variability Study of Extreme Blazars with VERITAS","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.HE","authors_text":"Orel Gueta (for the VERITAS collaboration)","submitted_at":"2019-08-08T14:04:08Z","abstract_excerpt":"The VERITAS array of imaging atmospheric Cherenkov telescopes has collected nearly 6000 hours of observations of active galactic nuclei (AGNs). It has detected 39 very-high-energy (VHE, >100 GeV) AGNs at redshifts up to z = 0.9, of which 24 are classified as high-frequency-peaked BL Lacertae objects (HBLs). VERITAS has obtained an extensive dataset of HBL, including extreme HBL (xHBL), observations, with lightcurves spanning up to 11 years, allowing the characterization of their long-term and short-term variability. A study of various xHBLs/HBLs in the VERITAS dataset is presented, and the cor"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1908.03085","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/1908.03085/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":"2026-07-04T23:52:26Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"y6g7kSt0L7pMQxpZGh+/g9IgPjLZ8IK7nLP5JF86k9s7ue8EDtT3Vsjn0DP4uqf2wdDF2AfRiquKbc9KqBlECQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-16T16:33:04.617324Z"},"content_sha256":"dc34f15fc84b49b314b8665ba498151be287872e7e0f85dc5f99620317d1429c","schema_version":"1.0","event_id":"sha256:dc34f15fc84b49b314b8665ba498151be287872e7e0f85dc5f99620317d1429c"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/SIPTGOSXDZZDOQ6LJF5TLNREYQ/bundle.json","state_url":"https://pith.science/pith/SIPTGOSXDZZDOQ6LJF5TLNREYQ/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/SIPTGOSXDZZDOQ6LJF5TLNREYQ/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":"2026-08-16T16:33:04Z","links":{"resolver":"https://pith.science/pith/SIPTGOSXDZZDOQ6LJF5TLNREYQ","bundle":"https://pith.science/pith/SIPTGOSXDZZDOQ6LJF5TLNREYQ/bundle.json","state":"https://pith.science/pith/SIPTGOSXDZZDOQ6LJF5TLNREYQ/state.json","well_known_bundle":"https://pith.science/.well-known/pith/SIPTGOSXDZZDOQ6LJF5TLNREYQ/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2019:SIPTGOSXDZZDOQ6LJF5TLNREYQ","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":"293e711502232fd464a1f1f49f892b2ef2bcf879c7a02ecf3f2f49584f4317fa","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2019-08-08T14:04:08Z","title_canon_sha256":"3633c68aa2a63e4b6907b64b44deb3abcabe617440234bb3e86b4db3856f8501"},"schema_version":"1.0","source":{"id":"1908.03085","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1908.03085","created_at":"2026-07-04T23:52:26Z"},{"alias_kind":"arxiv_version","alias_value":"1908.03085v1","created_at":"2026-07-04T23:52:26Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1908.03085","created_at":"2026-07-04T23:52:26Z"},{"alias_kind":"pith_short_12","alias_value":"SIPTGOSXDZZD","created_at":"2026-07-04T23:52:26Z"},{"alias_kind":"pith_short_16","alias_value":"SIPTGOSXDZZDOQ6L","created_at":"2026-07-04T23:52:26Z"},{"alias_kind":"pith_short_8","alias_value":"SIPTGOSX","created_at":"2026-07-04T23:52:26Z"}],"graph_snapshots":[{"event_id":"sha256:dc34f15fc84b49b314b8665ba498151be287872e7e0f85dc5f99620317d1429c","target":"graph","created_at":"2026-07-04T23:52:26Z","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/1908.03085/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"The VERITAS array of imaging atmospheric Cherenkov telescopes has collected nearly 6000 hours of observations of active galactic nuclei (AGNs). It has detected 39 very-high-energy (VHE, >100 GeV) AGNs at redshifts up to z = 0.9, of which 24 are classified as high-frequency-peaked BL Lacertae objects (HBLs). VERITAS has obtained an extensive dataset of HBL, including extreme HBL (xHBL), observations, with lightcurves spanning up to 11 years, allowing the characterization of their long-term and short-term variability. A study of various xHBLs/HBLs in the VERITAS dataset is presented, and the cor","authors_text":"Orel Gueta (for the VERITAS collaboration)","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2019-08-08T14:04:08Z","title":"Variability Study of Extreme Blazars with VERITAS"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1908.03085","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:b5cc64eff6c9a4ce801c21108f72894c040b92a2bc1ba504b33a6e7f48ae50d0","target":"record","created_at":"2026-07-04T23:52:26Z","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":"293e711502232fd464a1f1f49f892b2ef2bcf879c7a02ecf3f2f49584f4317fa","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2019-08-08T14:04:08Z","title_canon_sha256":"3633c68aa2a63e4b6907b64b44deb3abcabe617440234bb3e86b4db3856f8501"},"schema_version":"1.0","source":{"id":"1908.03085","kind":"arxiv","version":1}},"canonical_sha256":"921f333a571e723743cb497b35b624c43b4fa696968a324b10ba818f38609406","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"921f333a571e723743cb497b35b624c43b4fa696968a324b10ba818f38609406","first_computed_at":"2026-07-04T23:52:26.022216Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-04T23:52:26.022216Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"RnM7q6AMHlCbekI2SD/r7qfJSL2+L67CnOBKzCV/waKk2pftqB7ooueCZbrNsZ3L7BeZ+DM7FTmK04xjdy0cDw==","signature_status":"signed_v1","signed_at":"2026-07-04T23:52:26.022627Z","signed_message":"canonical_sha256_bytes"},"source_id":"1908.03085","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:b5cc64eff6c9a4ce801c21108f72894c040b92a2bc1ba504b33a6e7f48ae50d0","sha256:dc34f15fc84b49b314b8665ba498151be287872e7e0f85dc5f99620317d1429c"],"state_sha256":"bc81a2069244129617551196772042a538e5ee26bc7246569f98702866271834"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"qTpE3t43bYfdgDaEBuFQuDKpvE2zcXeUYAvxb3Toccd1r0vkUl9D2wbI+OqQVeHZt4YBWoUtrMGdSCj+RXTMBA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-16T16:33:04.621719Z","bundle_sha256":"f8523113cef957e2682bab7f959e5fcadd297663ae0da948968893ddf8eceb8c"}}