{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2021:42BS7NAPOWF7DKPDXL2FDTT4VB","short_pith_number":"pith:42BS7NAP","canonical_record":{"source":{"id":"2108.11906","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"astro-ph.HE","submitted_at":"2021-08-26T16:59:21Z","cross_cats_sorted":[],"title_canon_sha256":"386dea86ba315439ee09b86295a2324f20480dbd23131b872a4fcf9cc274c964","abstract_canon_sha256":"9980a88a403d75eb94c8ac51d7c2e61d92ffe3d7264439b7448954b08f50f228"},"schema_version":"1.0"},"canonical_sha256":"e6832fb40f758bf1a9e3baf451ce7ca8460aace68f6062fd7edb486349c36250","source":{"kind":"arxiv","id":"2108.11906","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2108.11906","created_at":"2026-07-05T03:09:10Z"},{"alias_kind":"arxiv_version","alias_value":"2108.11906v1","created_at":"2026-07-05T03:09:10Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2108.11906","created_at":"2026-07-05T03:09:10Z"},{"alias_kind":"pith_short_12","alias_value":"42BS7NAPOWF7","created_at":"2026-07-05T03:09:10Z"},{"alias_kind":"pith_short_16","alias_value":"42BS7NAPOWF7DKPD","created_at":"2026-07-05T03:09:10Z"},{"alias_kind":"pith_short_8","alias_value":"42BS7NAP","created_at":"2026-07-05T03:09:10Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2021:42BS7NAPOWF7DKPDXL2FDTT4VB","target":"record","payload":{"canonical_record":{"source":{"id":"2108.11906","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"astro-ph.HE","submitted_at":"2021-08-26T16:59:21Z","cross_cats_sorted":[],"title_canon_sha256":"386dea86ba315439ee09b86295a2324f20480dbd23131b872a4fcf9cc274c964","abstract_canon_sha256":"9980a88a403d75eb94c8ac51d7c2e61d92ffe3d7264439b7448954b08f50f228"},"schema_version":"1.0"},"canonical_sha256":"e6832fb40f758bf1a9e3baf451ce7ca8460aace68f6062fd7edb486349c36250","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T03:09:10.841980Z","signature_b64":"BYm13v3n4oOlTenaZBszeGQnjAOfd5CRzBG+7uTANzDZeup1uUM4dbPUwxOIyj2JUN0CAc82uh1793qKqZmvBw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"e6832fb40f758bf1a9e3baf451ce7ca8460aace68f6062fd7edb486349c36250","last_reissued_at":"2026-07-05T03:09:10.841627Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T03:09:10.841627Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2108.11906","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":"2026-07-05T03:09:10Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"cUEz7+P2rgGcIfXYF0XTWsXqx2MGLnzVhQsDeYSpb5QYUNQ2s/WhHCapM87hbgbxPKF4Hx8jW3clZCG1DNLjCA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-09T06:02:44.586673Z"},"content_sha256":"555bc52c2f017ba473c27e022e97ae64dfdd65e838ff4d4fd1dc492186d4906a","schema_version":"1.0","event_id":"sha256:555bc52c2f017ba473c27e022e97ae64dfdd65e838ff4d4fd1dc492186d4906a"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2021:42BS7NAPOWF7DKPDXL2FDTT4VB","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Two-zone model as origin of hard gamma-rays spectrum in extreme BL Lacs","license":"http://creativecommons.org/licenses/by/4.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.HE","authors_text":"E. Aguilar-Ruiz, N. Fraija","submitted_at":"2021-08-26T16:59:21Z","abstract_excerpt":"The emission of the so-called extreme blazars challenges the particle acceleration models. The hardness of its spectrum, $<2$, demands extreme parameters using the standard one-zone SSC model in the high energy band. Some authors use both two-zone or hadronic/leptohadronic models to relax these extreme values. In this work, we present a leptohadronic two-zone model with external radiation fields to explain the broadband emission, where the contribution of two components forms the hard-spectrum in the $\\gamma$-rays band. The first is produced by the photopion process, where accelerated protons "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2108.11906","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/2108.11906/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":"2026-07-05T03:09:10Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"nNpms0VQxVEngmO4kSwMYjStFLN3SsHNMrhl27XQYNBz7VOSDjTEGL3M3wPQnTO7qnKLPu5/+PcGYv2TFd5mAw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-09T06:02:44.587305Z"},"content_sha256":"edbf5728e8ab47a0cf29b876c98a75a7cd47ed8f170c915c3f93a0dbab04417f","schema_version":"1.0","event_id":"sha256:edbf5728e8ab47a0cf29b876c98a75a7cd47ed8f170c915c3f93a0dbab04417f"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/42BS7NAPOWF7DKPDXL2FDTT4VB/bundle.json","state_url":"https://pith.science/pith/42BS7NAPOWF7DKPDXL2FDTT4VB/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/42BS7NAPOWF7DKPDXL2FDTT4VB/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":"2026-07-09T06:02:44Z","links":{"resolver":"https://pith.science/pith/42BS7NAPOWF7DKPDXL2FDTT4VB","bundle":"https://pith.science/pith/42BS7NAPOWF7DKPDXL2FDTT4VB/bundle.json","state":"https://pith.science/pith/42BS7NAPOWF7DKPDXL2FDTT4VB/state.json","well_known_bundle":"https://pith.science/.well-known/pith/42BS7NAPOWF7DKPDXL2FDTT4VB/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2021:42BS7NAPOWF7DKPDXL2FDTT4VB","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":"9980a88a403d75eb94c8ac51d7c2e61d92ffe3d7264439b7448954b08f50f228","cross_cats_sorted":[],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"astro-ph.HE","submitted_at":"2021-08-26T16:59:21Z","title_canon_sha256":"386dea86ba315439ee09b86295a2324f20480dbd23131b872a4fcf9cc274c964"},"schema_version":"1.0","source":{"id":"2108.11906","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2108.11906","created_at":"2026-07-05T03:09:10Z"},{"alias_kind":"arxiv_version","alias_value":"2108.11906v1","created_at":"2026-07-05T03:09:10Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2108.11906","created_at":"2026-07-05T03:09:10Z"},{"alias_kind":"pith_short_12","alias_value":"42BS7NAPOWF7","created_at":"2026-07-05T03:09:10Z"},{"alias_kind":"pith_short_16","alias_value":"42BS7NAPOWF7DKPD","created_at":"2026-07-05T03:09:10Z"},{"alias_kind":"pith_short_8","alias_value":"42BS7NAP","created_at":"2026-07-05T03:09:10Z"}],"graph_snapshots":[{"event_id":"sha256:edbf5728e8ab47a0cf29b876c98a75a7cd47ed8f170c915c3f93a0dbab04417f","target":"graph","created_at":"2026-07-05T03:09:10Z","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/2108.11906/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"The emission of the so-called extreme blazars challenges the particle acceleration models. The hardness of its spectrum, $<2$, demands extreme parameters using the standard one-zone SSC model in the high energy band. Some authors use both two-zone or hadronic/leptohadronic models to relax these extreme values. In this work, we present a leptohadronic two-zone model with external radiation fields to explain the broadband emission, where the contribution of two components forms the hard-spectrum in the $\\gamma$-rays band. The first is produced by the photopion process, where accelerated protons ","authors_text":"E. Aguilar-Ruiz, N. Fraija","cross_cats":[],"headline":"","license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"astro-ph.HE","submitted_at":"2021-08-26T16:59:21Z","title":"Two-zone model as origin of hard gamma-rays spectrum in extreme BL Lacs"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2108.11906","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":"sha256:555bc52c2f017ba473c27e022e97ae64dfdd65e838ff4d4fd1dc492186d4906a","target":"record","created_at":"2026-07-05T03:09:10Z","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":"9980a88a403d75eb94c8ac51d7c2e61d92ffe3d7264439b7448954b08f50f228","cross_cats_sorted":[],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"astro-ph.HE","submitted_at":"2021-08-26T16:59:21Z","title_canon_sha256":"386dea86ba315439ee09b86295a2324f20480dbd23131b872a4fcf9cc274c964"},"schema_version":"1.0","source":{"id":"2108.11906","kind":"arxiv","version":1}},"canonical_sha256":"e6832fb40f758bf1a9e3baf451ce7ca8460aace68f6062fd7edb486349c36250","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"e6832fb40f758bf1a9e3baf451ce7ca8460aace68f6062fd7edb486349c36250","first_computed_at":"2026-07-05T03:09:10.841627Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T03:09:10.841627Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"BYm13v3n4oOlTenaZBszeGQnjAOfd5CRzBG+7uTANzDZeup1uUM4dbPUwxOIyj2JUN0CAc82uh1793qKqZmvBw==","signature_status":"signed_v1","signed_at":"2026-07-05T03:09:10.841980Z","signed_message":"canonical_sha256_bytes"},"source_id":"2108.11906","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:555bc52c2f017ba473c27e022e97ae64dfdd65e838ff4d4fd1dc492186d4906a","sha256:edbf5728e8ab47a0cf29b876c98a75a7cd47ed8f170c915c3f93a0dbab04417f"],"state_sha256":"a5218aac14ef5228fed9025d214fa970fcda9963391539915a3de1a7a0b95382"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"4MfrqG8XLb+E/qQJDqvJ00yTZTVpwOOtI8wnQY1ulkWfTA/jBp3jQBGPbsbsPBcgduMVVcHog9Twpz6DsXA2AA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-07-09T06:02:44.591380Z","bundle_sha256":"9a4c1f201ef208c017c073c5621b962924ae7b3dd9b671d97b663bb297fc7512"}}