{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2026:QHWYU7ZKSLCNVCMDZ3JOO3CS7U","short_pith_number":"pith:QHWYU7ZK","canonical_record":{"source":{"id":"2607.03420","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2026-07-03T15:30:15Z","cross_cats_sorted":[],"title_canon_sha256":"85127d7c24f5885bc6a3cffc77d8b55bf300252b97de46b46f2a1b33a659ae22","abstract_canon_sha256":"654d3bec0f4b8356538987da51fd62faa5448dd3cea5ed37934e473d09400800"},"schema_version":"1.0"},"canonical_sha256":"81ed8a7f2a92c4da8983ced2e76c52fd20567d2ec9eb067e80c0cde2b55460df","source":{"kind":"arxiv","id":"2607.03420","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2607.03420","created_at":"2026-07-07T02:17:42Z"},{"alias_kind":"arxiv_version","alias_value":"2607.03420v1","created_at":"2026-07-07T02:17:42Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2607.03420","created_at":"2026-07-07T02:17:42Z"},{"alias_kind":"pith_short_12","alias_value":"QHWYU7ZKSLCN","created_at":"2026-07-07T02:17:42Z"},{"alias_kind":"pith_short_16","alias_value":"QHWYU7ZKSLCNVCMD","created_at":"2026-07-07T02:17:42Z"},{"alias_kind":"pith_short_8","alias_value":"QHWYU7ZK","created_at":"2026-07-07T02:17:42Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2026:QHWYU7ZKSLCNVCMDZ3JOO3CS7U","target":"record","payload":{"canonical_record":{"source":{"id":"2607.03420","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2026-07-03T15:30:15Z","cross_cats_sorted":[],"title_canon_sha256":"85127d7c24f5885bc6a3cffc77d8b55bf300252b97de46b46f2a1b33a659ae22","abstract_canon_sha256":"654d3bec0f4b8356538987da51fd62faa5448dd3cea5ed37934e473d09400800"},"schema_version":"1.0"},"canonical_sha256":"81ed8a7f2a92c4da8983ced2e76c52fd20567d2ec9eb067e80c0cde2b55460df","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-07T02:17:42.353879Z","signature_b64":"+R2laHg4C2F+Pox/niIB7zE8JIYr8gDKv55tRXEXgKKIrlZviM0em0AhGZ8ZrGTCavo179uOqWOvddt6kVqkAw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"81ed8a7f2a92c4da8983ced2e76c52fd20567d2ec9eb067e80c0cde2b55460df","last_reissued_at":"2026-07-07T02:17:42.353203Z","signature_status":"signed_v1","first_computed_at":"2026-07-07T02:17:42.353203Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2607.03420","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":"2026-07-07T02:17:42Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"eDbkGoifj1O7Fw+nkoSMazub/rNjX8/xTJbFthy6k4U894gSCnqYcC1rrsPgdjXpbBTYcpdDGt6j9yc8jRZIDw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-01T20:58:53.026806Z"},"content_sha256":"916826fabc40fc0a700d5b2402b5730de46645615c9e09d115714200bd80cfb1","schema_version":"1.0","event_id":"sha256:916826fabc40fc0a700d5b2402b5730de46645615c9e09d115714200bd80cfb1"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2026:QHWYU7ZKSLCNVCMDZ3JOO3CS7U","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"PKS 2155-304: Long-Term Optical Photometric Monitoring and Variability Analysis","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.GA","authors_text":"E. J. Marchesini, E. Jofr\\'e, I. Andruchow, J. L. Weiss, J. P. Varela, L. Mammana, L. Zibecchi, R. Petrucci, S. Cellone","submitted_at":"2026-07-03T15:30:15Z","abstract_excerpt":"Through the detailed study of the optical flux behaviour in blazars over time, it is possible to infer the conditions responsible for their observed emission. PKS 2155-304, a BL Lac object detected from radio to TeV energies, is among the brightest blazars in the southern hemisphere. We present optical monitoring spanning over two decades using telescopes at Complejo Astron\\'omico El Leoncito and Estaci\\'on Astrof\\'isica de Bosque Alegre, Argentina. Differential light curves in the B, V, R, and I bands reveal significant variability on weekly and longer timescales, with occasional changes on s"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2607.03420","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/2607.03420/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":"2026-07-07T02:17:42Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"NEBF5FhqQUqCWis8SzG7dcKqJNshrAGNAZ+RPSi6RcQrdFY4QneQvKIObpUCVuzGVRKgMUtuY+DRCNIsC+8FCQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-01T20:58:53.027649Z"},"content_sha256":"b38c9f14ba7f1f455313c2d564b8e1b920bc34dd1a383ef7073532d36c601cff","schema_version":"1.0","event_id":"sha256:b38c9f14ba7f1f455313c2d564b8e1b920bc34dd1a383ef7073532d36c601cff"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/QHWYU7ZKSLCNVCMDZ3JOO3CS7U/bundle.json","state_url":"https://pith.science/pith/QHWYU7ZKSLCNVCMDZ3JOO3CS7U/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/QHWYU7ZKSLCNVCMDZ3JOO3CS7U/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":"2026-08-01T20:58:53Z","links":{"resolver":"https://pith.science/pith/QHWYU7ZKSLCNVCMDZ3JOO3CS7U","bundle":"https://pith.science/pith/QHWYU7ZKSLCNVCMDZ3JOO3CS7U/bundle.json","state":"https://pith.science/pith/QHWYU7ZKSLCNVCMDZ3JOO3CS7U/state.json","well_known_bundle":"https://pith.science/.well-known/pith/QHWYU7ZKSLCNVCMDZ3JOO3CS7U/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2026:QHWYU7ZKSLCNVCMDZ3JOO3CS7U","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":"654d3bec0f4b8356538987da51fd62faa5448dd3cea5ed37934e473d09400800","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2026-07-03T15:30:15Z","title_canon_sha256":"85127d7c24f5885bc6a3cffc77d8b55bf300252b97de46b46f2a1b33a659ae22"},"schema_version":"1.0","source":{"id":"2607.03420","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2607.03420","created_at":"2026-07-07T02:17:42Z"},{"alias_kind":"arxiv_version","alias_value":"2607.03420v1","created_at":"2026-07-07T02:17:42Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2607.03420","created_at":"2026-07-07T02:17:42Z"},{"alias_kind":"pith_short_12","alias_value":"QHWYU7ZKSLCN","created_at":"2026-07-07T02:17:42Z"},{"alias_kind":"pith_short_16","alias_value":"QHWYU7ZKSLCNVCMD","created_at":"2026-07-07T02:17:42Z"},{"alias_kind":"pith_short_8","alias_value":"QHWYU7ZK","created_at":"2026-07-07T02:17:42Z"}],"graph_snapshots":[{"event_id":"sha256:b38c9f14ba7f1f455313c2d564b8e1b920bc34dd1a383ef7073532d36c601cff","target":"graph","created_at":"2026-07-07T02:17:42Z","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/2607.03420/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"Through the detailed study of the optical flux behaviour in blazars over time, it is possible to infer the conditions responsible for their observed emission. PKS 2155-304, a BL Lac object detected from radio to TeV energies, is among the brightest blazars in the southern hemisphere. We present optical monitoring spanning over two decades using telescopes at Complejo Astron\\'omico El Leoncito and Estaci\\'on Astrof\\'isica de Bosque Alegre, Argentina. Differential light curves in the B, V, R, and I bands reveal significant variability on weekly and longer timescales, with occasional changes on s","authors_text":"E. J. Marchesini, E. Jofr\\'e, I. Andruchow, J. L. Weiss, J. P. Varela, L. Mammana, L. Zibecchi, R. Petrucci, S. Cellone","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2026-07-03T15:30:15Z","title":"PKS 2155-304: Long-Term Optical Photometric Monitoring and Variability Analysis"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2607.03420","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":"sha256:916826fabc40fc0a700d5b2402b5730de46645615c9e09d115714200bd80cfb1","target":"record","created_at":"2026-07-07T02:17:42Z","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":"654d3bec0f4b8356538987da51fd62faa5448dd3cea5ed37934e473d09400800","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2026-07-03T15:30:15Z","title_canon_sha256":"85127d7c24f5885bc6a3cffc77d8b55bf300252b97de46b46f2a1b33a659ae22"},"schema_version":"1.0","source":{"id":"2607.03420","kind":"arxiv","version":1}},"canonical_sha256":"81ed8a7f2a92c4da8983ced2e76c52fd20567d2ec9eb067e80c0cde2b55460df","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"81ed8a7f2a92c4da8983ced2e76c52fd20567d2ec9eb067e80c0cde2b55460df","first_computed_at":"2026-07-07T02:17:42.353203Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-07T02:17:42.353203Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"+R2laHg4C2F+Pox/niIB7zE8JIYr8gDKv55tRXEXgKKIrlZviM0em0AhGZ8ZrGTCavo179uOqWOvddt6kVqkAw==","signature_status":"signed_v1","signed_at":"2026-07-07T02:17:42.353879Z","signed_message":"canonical_sha256_bytes"},"source_id":"2607.03420","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:916826fabc40fc0a700d5b2402b5730de46645615c9e09d115714200bd80cfb1","sha256:b38c9f14ba7f1f455313c2d564b8e1b920bc34dd1a383ef7073532d36c601cff"],"state_sha256":"0ebcbb9b1c2bcb02a3b2528ecbcecdea92a58205912f6d61479c40c76aab6d0b"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"Vmk+l4WKGLJsJSo9WbA6CVp5zBWcfhL/DEoq+EeHs8tuk+BllP2ACcjW04NLLByjIWsYIiKdhMOj0eqWu4neCw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-01T20:58:53.060172Z","bundle_sha256":"d8e4ef23047a638ad476eced4896e3791fb6f8bb784fc4d8704f6b05e7d41b40"}}