{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2013:6IHJTHLCLZAMJL6KYOMC3F43SV","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":"7673c49df8c0cfd6f50d7369d9bee84a8bd55c78b19e69b94b0b57fee099847f","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2013-11-24T16:10:52Z","title_canon_sha256":"587ca3a5e99a5faa07fb4e94f06fd72b1ba8d81ec5f7ce13c5614b189ad2ed77"},"schema_version":"1.0","source":{"id":"1311.6140","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1311.6140","created_at":"2026-05-18T02:44:00Z"},{"alias_kind":"arxiv_version","alias_value":"1311.6140v2","created_at":"2026-05-18T02:44:00Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1311.6140","created_at":"2026-05-18T02:44:00Z"},{"alias_kind":"pith_short_12","alias_value":"6IHJTHLCLZAM","created_at":"2026-05-18T12:27:36Z"},{"alias_kind":"pith_short_16","alias_value":"6IHJTHLCLZAMJL6K","created_at":"2026-05-18T12:27:36Z"},{"alias_kind":"pith_short_8","alias_value":"6IHJTHLC","created_at":"2026-05-18T12:27:36Z"}],"graph_snapshots":[{"event_id":"sha256:e89b895b24f60057890ed5be9f24beacd0944c86942029677964dd400afa5ef8","target":"graph","created_at":"2026-05-18T02:44:00Z","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"},"paper":{"abstract_excerpt":"Ultra-high energy (UHE) photons play an important role as an independent probe of the photo-pion production mechanism by UHE cosmic rays. Their observation, or non-observation, may constrain astrophysical scenarios for the origin of UHECRs and help to understand the nature of the flux suppression observed by several experiments at energies above $10^{19.5}$ eV. Whereas the interaction length of UHE photons above $10^{17}$ eV ranges from a few hundred kpc up to tenths of Mpc, photons can interact with the extragalactic background radiation initiating the development of electromagnetic cascades ","authors_text":"Manlio De Domenico, Mariangela Settimo","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2013-11-24T16:10:52Z","title":"Propagation of extragalactic photons at ultra-high energy with the EleCa code"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1311.6140","kind":"arxiv","version":2},"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:c38c18690f2aa6e5543a9de32a32c2c43b914582d43f8327378572cb703960d5","target":"record","created_at":"2026-05-18T02:44:00Z","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":"7673c49df8c0cfd6f50d7369d9bee84a8bd55c78b19e69b94b0b57fee099847f","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2013-11-24T16:10:52Z","title_canon_sha256":"587ca3a5e99a5faa07fb4e94f06fd72b1ba8d81ec5f7ce13c5614b189ad2ed77"},"schema_version":"1.0","source":{"id":"1311.6140","kind":"arxiv","version":2}},"canonical_sha256":"f20e999d625e40c4afcac3982d979b957bbb70d53561a59e6923d0048df5b831","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"f20e999d625e40c4afcac3982d979b957bbb70d53561a59e6923d0048df5b831","first_computed_at":"2026-05-18T02:44:00.565012Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T02:44:00.565012Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"/GO7YJMAcBTfTJhJxG+z4/W4xKsGAI0oGDcki3RfVrxzsFSovJj5YWCHTawEMo+X8x3Mj1o57LpWsgbGbblpDg==","signature_status":"signed_v1","signed_at":"2026-05-18T02:44:00.565554Z","signed_message":"canonical_sha256_bytes"},"source_id":"1311.6140","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:c38c18690f2aa6e5543a9de32a32c2c43b914582d43f8327378572cb703960d5","sha256:e89b895b24f60057890ed5be9f24beacd0944c86942029677964dd400afa5ef8"],"state_sha256":"9d7416164da3fbeaed6bad45aacc9450d8a6bc637b758c1bcd759964d79e1cc5"}