{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2020:6JK624A7553PBAWFKURZ6HNU7A","short_pith_number":"pith:6JK624A7","canonical_record":{"source":{"id":"2004.13596","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2020-04-28T15:34:08Z","cross_cats_sorted":[],"title_canon_sha256":"5035082c3bd7b3df6adfb8a1a1d77be0da8de9fcb4cc7d3b68c77023c74cd79c","abstract_canon_sha256":"9ee5694a605cdc7319afa073b5c85826c554ef5efd705ad9840e91d16118b319"},"schema_version":"1.0"},"canonical_sha256":"f255ed701fef76f082c555239f1db4f827a1090cec1ceb70704f407339dbe1a3","source":{"kind":"arxiv","id":"2004.13596","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2004.13596","created_at":"2026-07-05T01:53:49Z"},{"alias_kind":"arxiv_version","alias_value":"2004.13596v1","created_at":"2026-07-05T01:53:49Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2004.13596","created_at":"2026-07-05T01:53:49Z"},{"alias_kind":"pith_short_12","alias_value":"6JK624A7553P","created_at":"2026-07-05T01:53:49Z"},{"alias_kind":"pith_short_16","alias_value":"6JK624A7553PBAWF","created_at":"2026-07-05T01:53:49Z"},{"alias_kind":"pith_short_8","alias_value":"6JK624A7","created_at":"2026-07-05T01:53:49Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2020:6JK624A7553PBAWFKURZ6HNU7A","target":"record","payload":{"canonical_record":{"source":{"id":"2004.13596","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2020-04-28T15:34:08Z","cross_cats_sorted":[],"title_canon_sha256":"5035082c3bd7b3df6adfb8a1a1d77be0da8de9fcb4cc7d3b68c77023c74cd79c","abstract_canon_sha256":"9ee5694a605cdc7319afa073b5c85826c554ef5efd705ad9840e91d16118b319"},"schema_version":"1.0"},"canonical_sha256":"f255ed701fef76f082c555239f1db4f827a1090cec1ceb70704f407339dbe1a3","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T01:53:49.953196Z","signature_b64":"qeLpA1GvEXRRljT/svx2/pfo2bkjdCuDtKWpBGAjp1tfXRWx5g14yXbV0zoguLe8HmjD7pvJmNt5fxL6se6ABw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"f255ed701fef76f082c555239f1db4f827a1090cec1ceb70704f407339dbe1a3","last_reissued_at":"2026-07-05T01:53:49.952794Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T01:53:49.952794Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2004.13596","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":"2026-07-05T01:53:49Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"q4plEJa782LZ21U522asY7YcfQ9e32s9srZ5bLF9P2OmAU6cnpy81fcz6JRhZNfjR1qSkOoFKncRvE5/ijtpAA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-07T00:33:59.986405Z"},"content_sha256":"93165065c66948e02e1532ff70e6775049efa8fee286b8b50ec0ea8cf4e9d8cc","schema_version":"1.0","event_id":"sha256:93165065c66948e02e1532ff70e6775049efa8fee286b8b50ec0ea8cf4e9d8cc"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2020:6JK624A7553PBAWFKURZ6HNU7A","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"An updated estimate of the cosmic radio background and implications for ultra-high-energy photon propagation","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.HE","authors_text":"A. M. M. Scaife (1) ((1) JBCA, Astronomy, Dept. of Physics, H. T. J. Bevins (1), I. C. Ni\\c{t}u (1), J. D. Bray (1), Univ. of Manchester)","submitted_at":"2020-04-28T15:34:08Z","abstract_excerpt":"We present an updated estimate of the cosmic radio background (CRB) and the corresponding attenuation lengths for ultra-high energy photons. This new estimate provides associated uncertainties as a function of frequency derived from observational constraints on key physical parameters. We also present the expected variation in the spectrum of the CRB as a function of these parameters, as well as accounting for the expected variation in spectral index among the population of radio galaxies. The new estimate presented in this work shows better agreement with observational constraints from radio "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2004.13596","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/2004.13596/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":"2026-07-05T01:53:49Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"PPsXbKBaC5Tdwm6LUTMZcOPvAiOv+GcIBjERMnKcEFY75+Ank+4hvSDJqKiYZ658lKwMr+M1+8+Kb4TF3PV+Bg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-07T00:33:59.987352Z"},"content_sha256":"1aa1a628b657d8153de02fec8bbbf18e82d07df3bead5e5e3778316c9379c8d4","schema_version":"1.0","event_id":"sha256:1aa1a628b657d8153de02fec8bbbf18e82d07df3bead5e5e3778316c9379c8d4"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/6JK624A7553PBAWFKURZ6HNU7A/bundle.json","state_url":"https://pith.science/pith/6JK624A7553PBAWFKURZ6HNU7A/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/6JK624A7553PBAWFKURZ6HNU7A/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":"2026-08-07T00:34:00Z","links":{"resolver":"https://pith.science/pith/6JK624A7553PBAWFKURZ6HNU7A","bundle":"https://pith.science/pith/6JK624A7553PBAWFKURZ6HNU7A/bundle.json","state":"https://pith.science/pith/6JK624A7553PBAWFKURZ6HNU7A/state.json","well_known_bundle":"https://pith.science/.well-known/pith/6JK624A7553PBAWFKURZ6HNU7A/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2020:6JK624A7553PBAWFKURZ6HNU7A","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":"9ee5694a605cdc7319afa073b5c85826c554ef5efd705ad9840e91d16118b319","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2020-04-28T15:34:08Z","title_canon_sha256":"5035082c3bd7b3df6adfb8a1a1d77be0da8de9fcb4cc7d3b68c77023c74cd79c"},"schema_version":"1.0","source":{"id":"2004.13596","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2004.13596","created_at":"2026-07-05T01:53:49Z"},{"alias_kind":"arxiv_version","alias_value":"2004.13596v1","created_at":"2026-07-05T01:53:49Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2004.13596","created_at":"2026-07-05T01:53:49Z"},{"alias_kind":"pith_short_12","alias_value":"6JK624A7553P","created_at":"2026-07-05T01:53:49Z"},{"alias_kind":"pith_short_16","alias_value":"6JK624A7553PBAWF","created_at":"2026-07-05T01:53:49Z"},{"alias_kind":"pith_short_8","alias_value":"6JK624A7","created_at":"2026-07-05T01:53:49Z"}],"graph_snapshots":[{"event_id":"sha256:1aa1a628b657d8153de02fec8bbbf18e82d07df3bead5e5e3778316c9379c8d4","target":"graph","created_at":"2026-07-05T01:53:49Z","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/2004.13596/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"We present an updated estimate of the cosmic radio background (CRB) and the corresponding attenuation lengths for ultra-high energy photons. This new estimate provides associated uncertainties as a function of frequency derived from observational constraints on key physical parameters. We also present the expected variation in the spectrum of the CRB as a function of these parameters, as well as accounting for the expected variation in spectral index among the population of radio galaxies. The new estimate presented in this work shows better agreement with observational constraints from radio ","authors_text":"A. M. M. Scaife (1) ((1) JBCA, Astronomy, Dept. of Physics, H. T. J. Bevins (1), I. C. Ni\\c{t}u (1), J. D. Bray (1), Univ. of Manchester)","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2020-04-28T15:34:08Z","title":"An updated estimate of the cosmic radio background and implications for ultra-high-energy photon propagation"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2004.13596","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":"sha256:93165065c66948e02e1532ff70e6775049efa8fee286b8b50ec0ea8cf4e9d8cc","target":"record","created_at":"2026-07-05T01:53:49Z","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":"9ee5694a605cdc7319afa073b5c85826c554ef5efd705ad9840e91d16118b319","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2020-04-28T15:34:08Z","title_canon_sha256":"5035082c3bd7b3df6adfb8a1a1d77be0da8de9fcb4cc7d3b68c77023c74cd79c"},"schema_version":"1.0","source":{"id":"2004.13596","kind":"arxiv","version":1}},"canonical_sha256":"f255ed701fef76f082c555239f1db4f827a1090cec1ceb70704f407339dbe1a3","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"f255ed701fef76f082c555239f1db4f827a1090cec1ceb70704f407339dbe1a3","first_computed_at":"2026-07-05T01:53:49.952794Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T01:53:49.952794Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"qeLpA1GvEXRRljT/svx2/pfo2bkjdCuDtKWpBGAjp1tfXRWx5g14yXbV0zoguLe8HmjD7pvJmNt5fxL6se6ABw==","signature_status":"signed_v1","signed_at":"2026-07-05T01:53:49.953196Z","signed_message":"canonical_sha256_bytes"},"source_id":"2004.13596","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:93165065c66948e02e1532ff70e6775049efa8fee286b8b50ec0ea8cf4e9d8cc","sha256:1aa1a628b657d8153de02fec8bbbf18e82d07df3bead5e5e3778316c9379c8d4"],"state_sha256":"3d36b7ce14ec3c1b5d2cef0fccc2c39fec782dd74f83a2ca6d039eee9e8a5fba"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"TDqkVBc/7rd31owN8qQjkv6v0EsBian5IlQ+rblAfeD8tllvw/6IPIuFR+0joHVuhZCF0QREINsTBkOJV6xMDg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-07T00:34:00.048583Z","bundle_sha256":"648cf127350217dbaaf76aff67e7bdd7e6face938f7819cfdac9c8131ec707a3"}}