{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2021:JJHTNWWP2M6JCAP6KM6HXKKOAZ","short_pith_number":"pith:JJHTNWWP","canonical_record":{"source":{"id":"2108.05572","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2021-08-12T07:42:39Z","cross_cats_sorted":["astro-ph.IM"],"title_canon_sha256":"aa7be3d6a2096ea1e904f1a34cf7e54740c55ccd294e96389da759ab03b7468c","abstract_canon_sha256":"b3243746a5799d7c9bd25125812ecba9034d1f0757f8dcb2d65ff11e5bf39b92"},"schema_version":"1.0"},"canonical_sha256":"4a4f36dacfd33c9101fe533c7ba94e065452abeef4fde0ba497e6edc9befc6a8","source":{"kind":"arxiv","id":"2108.05572","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2108.05572","created_at":"2026-07-05T03:07:30Z"},{"alias_kind":"arxiv_version","alias_value":"2108.05572v1","created_at":"2026-07-05T03:07:30Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2108.05572","created_at":"2026-07-05T03:07:30Z"},{"alias_kind":"pith_short_12","alias_value":"JJHTNWWP2M6J","created_at":"2026-07-05T03:07:30Z"},{"alias_kind":"pith_short_16","alias_value":"JJHTNWWP2M6JCAP6","created_at":"2026-07-05T03:07:30Z"},{"alias_kind":"pith_short_8","alias_value":"JJHTNWWP","created_at":"2026-07-05T03:07:30Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2021:JJHTNWWP2M6JCAP6KM6HXKKOAZ","target":"record","payload":{"canonical_record":{"source":{"id":"2108.05572","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2021-08-12T07:42:39Z","cross_cats_sorted":["astro-ph.IM"],"title_canon_sha256":"aa7be3d6a2096ea1e904f1a34cf7e54740c55ccd294e96389da759ab03b7468c","abstract_canon_sha256":"b3243746a5799d7c9bd25125812ecba9034d1f0757f8dcb2d65ff11e5bf39b92"},"schema_version":"1.0"},"canonical_sha256":"4a4f36dacfd33c9101fe533c7ba94e065452abeef4fde0ba497e6edc9befc6a8","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T03:07:30.688522Z","signature_b64":"+bn4ui2Cp7uNxOznWpC6j07kKFJYPweUj8DS58lLyv/mrxnTbqyAmhWmrQ/rz+OcpTf5YYXv0YizTbJrQzkWAA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"4a4f36dacfd33c9101fe533c7ba94e065452abeef4fde0ba497e6edc9befc6a8","last_reissued_at":"2026-07-05T03:07:30.688106Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T03:07:30.688106Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2108.05572","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":"2026-07-05T03:07:30Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"+O+HUR0SA2ayNoQOZA3/as9zdrVi/EbrDOjD6pF7Rk1HwjktbnOyb/mBXB17Icd7UQTFA2QyzXV5/GL+jtPpDA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-07T00:14:49.832881Z"},"content_sha256":"ec05917c850ccccc4ea284b9d78cf7d1236549c834bb31a8450f7d06b082590a","schema_version":"1.0","event_id":"sha256:ec05917c850ccccc4ea284b9d78cf7d1236549c834bb31a8450f7d06b082590a"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2021:JJHTNWWP2M6JCAP6KM6HXKKOAZ","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Hybrid cosmic ray measurements using the IceAct telescopes in coincidence with the IceCube and IceTop detectors","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.IM"],"primary_cat":"astro-ph.HE","authors_text":"Adrian Zink, Florian Rehbein, Frank Maslowski, Giang Do, Johannes Sch\\\"afer, John W. Hewitt, Larissa Paul, Matthias Plum, Merlin Schaufel (for the IceCube Collaboration), Thomas Bretz","submitted_at":"2021-08-12T07:42:39Z","abstract_excerpt":"IceAct is a proposed surface array of compact (50 cm diameter) and cost-effective Imaging Air Cherenkov Telescopes installed at the site of the IceCube Neutrino Observatory at the geographic South Pole. Since January 2019, two IceAct telescope demonstrators, featuring 61 silicon pho- tomultiplier (SiPM) pixels have been taking data in the center of the IceTop surface array during the austral winter. We present the first analysis of hybrid cosmic ray events detected by the IceAct imaging air-Cherenkov telescopes in coincidence with the IceCube Neutrino Observatory, includ- ing the IceTop surfac"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2108.05572","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/2108.05572/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":"2026-07-05T03:07:30Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"aHvFAjiOPR+AHhju+a1EDQ8UHWStlhpfV4H7QUeLxYVYYCiGOy89MAaQd/2qQnuYogaj6sOAUDTW7gwyAzqVDQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-07T00:14:49.833428Z"},"content_sha256":"612a8c48d06296d0f02253e3e742008907c8172eaf36c7d52184fafeedcbeae8","schema_version":"1.0","event_id":"sha256:612a8c48d06296d0f02253e3e742008907c8172eaf36c7d52184fafeedcbeae8"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/JJHTNWWP2M6JCAP6KM6HXKKOAZ/bundle.json","state_url":"https://pith.science/pith/JJHTNWWP2M6JCAP6KM6HXKKOAZ/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/JJHTNWWP2M6JCAP6KM6HXKKOAZ/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":"2026-08-07T00:14:49Z","links":{"resolver":"https://pith.science/pith/JJHTNWWP2M6JCAP6KM6HXKKOAZ","bundle":"https://pith.science/pith/JJHTNWWP2M6JCAP6KM6HXKKOAZ/bundle.json","state":"https://pith.science/pith/JJHTNWWP2M6JCAP6KM6HXKKOAZ/state.json","well_known_bundle":"https://pith.science/.well-known/pith/JJHTNWWP2M6JCAP6KM6HXKKOAZ/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2021:JJHTNWWP2M6JCAP6KM6HXKKOAZ","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":"b3243746a5799d7c9bd25125812ecba9034d1f0757f8dcb2d65ff11e5bf39b92","cross_cats_sorted":["astro-ph.IM"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2021-08-12T07:42:39Z","title_canon_sha256":"aa7be3d6a2096ea1e904f1a34cf7e54740c55ccd294e96389da759ab03b7468c"},"schema_version":"1.0","source":{"id":"2108.05572","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2108.05572","created_at":"2026-07-05T03:07:30Z"},{"alias_kind":"arxiv_version","alias_value":"2108.05572v1","created_at":"2026-07-05T03:07:30Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2108.05572","created_at":"2026-07-05T03:07:30Z"},{"alias_kind":"pith_short_12","alias_value":"JJHTNWWP2M6J","created_at":"2026-07-05T03:07:30Z"},{"alias_kind":"pith_short_16","alias_value":"JJHTNWWP2M6JCAP6","created_at":"2026-07-05T03:07:30Z"},{"alias_kind":"pith_short_8","alias_value":"JJHTNWWP","created_at":"2026-07-05T03:07:30Z"}],"graph_snapshots":[{"event_id":"sha256:612a8c48d06296d0f02253e3e742008907c8172eaf36c7d52184fafeedcbeae8","target":"graph","created_at":"2026-07-05T03:07:30Z","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/2108.05572/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"IceAct is a proposed surface array of compact (50 cm diameter) and cost-effective Imaging Air Cherenkov Telescopes installed at the site of the IceCube Neutrino Observatory at the geographic South Pole. Since January 2019, two IceAct telescope demonstrators, featuring 61 silicon pho- tomultiplier (SiPM) pixels have been taking data in the center of the IceTop surface array during the austral winter. We present the first analysis of hybrid cosmic ray events detected by the IceAct imaging air-Cherenkov telescopes in coincidence with the IceCube Neutrino Observatory, includ- ing the IceTop surfac","authors_text":"Adrian Zink, Florian Rehbein, Frank Maslowski, Giang Do, Johannes Sch\\\"afer, John W. Hewitt, Larissa Paul, Matthias Plum, Merlin Schaufel (for the IceCube Collaboration), Thomas Bretz","cross_cats":["astro-ph.IM"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2021-08-12T07:42:39Z","title":"Hybrid cosmic ray measurements using the IceAct telescopes in coincidence with the IceCube and IceTop detectors"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2108.05572","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:ec05917c850ccccc4ea284b9d78cf7d1236549c834bb31a8450f7d06b082590a","target":"record","created_at":"2026-07-05T03:07:30Z","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":"b3243746a5799d7c9bd25125812ecba9034d1f0757f8dcb2d65ff11e5bf39b92","cross_cats_sorted":["astro-ph.IM"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2021-08-12T07:42:39Z","title_canon_sha256":"aa7be3d6a2096ea1e904f1a34cf7e54740c55ccd294e96389da759ab03b7468c"},"schema_version":"1.0","source":{"id":"2108.05572","kind":"arxiv","version":1}},"canonical_sha256":"4a4f36dacfd33c9101fe533c7ba94e065452abeef4fde0ba497e6edc9befc6a8","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"4a4f36dacfd33c9101fe533c7ba94e065452abeef4fde0ba497e6edc9befc6a8","first_computed_at":"2026-07-05T03:07:30.688106Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T03:07:30.688106Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"+bn4ui2Cp7uNxOznWpC6j07kKFJYPweUj8DS58lLyv/mrxnTbqyAmhWmrQ/rz+OcpTf5YYXv0YizTbJrQzkWAA==","signature_status":"signed_v1","signed_at":"2026-07-05T03:07:30.688522Z","signed_message":"canonical_sha256_bytes"},"source_id":"2108.05572","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:ec05917c850ccccc4ea284b9d78cf7d1236549c834bb31a8450f7d06b082590a","sha256:612a8c48d06296d0f02253e3e742008907c8172eaf36c7d52184fafeedcbeae8"],"state_sha256":"75ca70b74303a98534d7e415807016d1c1ad0361c9327d23a3c78680c5614ba6"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"8wMkeptC8CpeU4sqFI2/RVQ1xantmYRz2KVWVJ1RdOke7dKUMkugOX+KCfcoMmv+f0V0ItuwXQugmB+pRFghBg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-07T00:14:49.839006Z","bundle_sha256":"cd9d5229cdf088d3b8c35cfe125d8c676f898c4cfb49fd27861e1655a2753bd6"}}