{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2013:RYU72RG5IJ5AFKIAZU7PNR7MPM","short_pith_number":"pith:RYU72RG5","canonical_record":{"source":{"id":"1305.2163","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2013-05-09T17:59:32Z","cross_cats_sorted":[],"title_canon_sha256":"8261b5f0995e727c73cbb950382a0cf8f139466eb95438f7982280c0a2730e1d","abstract_canon_sha256":"f4a125bad84fe41c8e42533e97a1c4be868ef4972366d0cbaa0ae845f8a7dce0"},"schema_version":"1.0"},"canonical_sha256":"8e29fd44dd427a02a900cd3ef6c7ec7b2f915a2938508b998a35e1dfad436510","source":{"kind":"arxiv","id":"1305.2163","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1305.2163","created_at":"2026-07-04T23:57:44Z"},{"alias_kind":"arxiv_version","alias_value":"1305.2163v2","created_at":"2026-07-04T23:57:44Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1305.2163","created_at":"2026-07-04T23:57:44Z"},{"alias_kind":"pith_short_12","alias_value":"RYU72RG5IJ5A","created_at":"2026-07-04T23:57:44Z"},{"alias_kind":"pith_short_16","alias_value":"RYU72RG5IJ5AFKIA","created_at":"2026-07-04T23:57:44Z"},{"alias_kind":"pith_short_8","alias_value":"RYU72RG5","created_at":"2026-07-04T23:57:44Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2013:RYU72RG5IJ5AFKIAZU7PNR7MPM","target":"record","payload":{"canonical_record":{"source":{"id":"1305.2163","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2013-05-09T17:59:32Z","cross_cats_sorted":[],"title_canon_sha256":"8261b5f0995e727c73cbb950382a0cf8f139466eb95438f7982280c0a2730e1d","abstract_canon_sha256":"f4a125bad84fe41c8e42533e97a1c4be868ef4972366d0cbaa0ae845f8a7dce0"},"schema_version":"1.0"},"canonical_sha256":"8e29fd44dd427a02a900cd3ef6c7ec7b2f915a2938508b998a35e1dfad436510","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-04T23:57:44.399428Z","signature_b64":"baY37yHdpLgi5mwLlwo7msu93eXxQmKxbeS43BccoicHRcrjWxCy/CGe2W83pCbb1SD+1X637ZgXtIjqmLeLAQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"8e29fd44dd427a02a900cd3ef6c7ec7b2f915a2938508b998a35e1dfad436510","last_reissued_at":"2026-07-04T23:57:44.398995Z","signature_status":"signed_v1","first_computed_at":"2026-07-04T23:57:44.398995Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1305.2163","source_version":2,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-07-04T23:57:44Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"p7tc5gb3DGN9NFzz0tZw9wyh1GvfJwXhE9xgLz5PfpUkEsDEDDj5jav7pva0zIyssdq0yqoh6t1IoZf2qTARAg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-16T09:05:31.095069Z"},"content_sha256":"466681e4208ecacc3fe5971e6891c9046f0336984896362411e76cc84cca2098","schema_version":"1.0","event_id":"sha256:466681e4208ecacc3fe5971e6891c9046f0336984896362411e76cc84cca2098"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2013:RYU72RG5IJ5AFKIAZU7PNR7MPM","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Measurement of the expansion rate of the Universe from \\gamma-ray attenuation","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.CO","authors_text":"A. Dom\\'inguez (UC Riverside), F. Prada (UAM-CSIC, IAA-CSIC)","submitted_at":"2013-05-09T17:59:32Z","abstract_excerpt":"A measurement of the expansion rate of the Universe (that is the Hubble constant, H0) is derived here using the gamma-ray attenuation observed in the spectra of gamma-ray sources produced by the interaction of extragalactic gamma-ray photons with the photons of the extragalactic background light (EBL). The Hubble constant that is determined with our technique, for a Lambda CDM cosmology, is H0=71.8_{-5.6}^{+4.6}(stat)_{-13.8}^{+7.2}(syst) km s^{-1} Mpc^{-1}. This value is compatible with present-day measurements using well established methods such as local distance ladders and cosmological pro"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1305.2163","kind":"arxiv","version":2},"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/1305.2163/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":"2026-07-04T23:57:44Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"zaYiMScSxx6YeiKxc16Sku38cXKA0tKZxsAmvOAzXCaFgeNSEyuOWnxGJrCjKvCesCcCvWjQdZWLcsKSQmB4Dg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-16T09:05:31.095701Z"},"content_sha256":"cb86d8ae4d78e25d6a4f7eb5c2c17a1f7053612cc716742aa1514000fe186eed","schema_version":"1.0","event_id":"sha256:cb86d8ae4d78e25d6a4f7eb5c2c17a1f7053612cc716742aa1514000fe186eed"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/RYU72RG5IJ5AFKIAZU7PNR7MPM/bundle.json","state_url":"https://pith.science/pith/RYU72RG5IJ5AFKIAZU7PNR7MPM/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/RYU72RG5IJ5AFKIAZU7PNR7MPM/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":"2026-08-16T09:05:31Z","links":{"resolver":"https://pith.science/pith/RYU72RG5IJ5AFKIAZU7PNR7MPM","bundle":"https://pith.science/pith/RYU72RG5IJ5AFKIAZU7PNR7MPM/bundle.json","state":"https://pith.science/pith/RYU72RG5IJ5AFKIAZU7PNR7MPM/state.json","well_known_bundle":"https://pith.science/.well-known/pith/RYU72RG5IJ5AFKIAZU7PNR7MPM/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2013:RYU72RG5IJ5AFKIAZU7PNR7MPM","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":"f4a125bad84fe41c8e42533e97a1c4be868ef4972366d0cbaa0ae845f8a7dce0","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2013-05-09T17:59:32Z","title_canon_sha256":"8261b5f0995e727c73cbb950382a0cf8f139466eb95438f7982280c0a2730e1d"},"schema_version":"1.0","source":{"id":"1305.2163","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1305.2163","created_at":"2026-07-04T23:57:44Z"},{"alias_kind":"arxiv_version","alias_value":"1305.2163v2","created_at":"2026-07-04T23:57:44Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1305.2163","created_at":"2026-07-04T23:57:44Z"},{"alias_kind":"pith_short_12","alias_value":"RYU72RG5IJ5A","created_at":"2026-07-04T23:57:44Z"},{"alias_kind":"pith_short_16","alias_value":"RYU72RG5IJ5AFKIA","created_at":"2026-07-04T23:57:44Z"},{"alias_kind":"pith_short_8","alias_value":"RYU72RG5","created_at":"2026-07-04T23:57:44Z"}],"graph_snapshots":[{"event_id":"sha256:cb86d8ae4d78e25d6a4f7eb5c2c17a1f7053612cc716742aa1514000fe186eed","target":"graph","created_at":"2026-07-04T23:57:44Z","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/1305.2163/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"A measurement of the expansion rate of the Universe (that is the Hubble constant, H0) is derived here using the gamma-ray attenuation observed in the spectra of gamma-ray sources produced by the interaction of extragalactic gamma-ray photons with the photons of the extragalactic background light (EBL). The Hubble constant that is determined with our technique, for a Lambda CDM cosmology, is H0=71.8_{-5.6}^{+4.6}(stat)_{-13.8}^{+7.2}(syst) km s^{-1} Mpc^{-1}. This value is compatible with present-day measurements using well established methods such as local distance ladders and cosmological pro","authors_text":"A. Dom\\'inguez (UC Riverside), F. Prada (UAM-CSIC, IAA-CSIC)","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2013-05-09T17:59:32Z","title":"Measurement of the expansion rate of the Universe from \\gamma-ray attenuation"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1305.2163","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":"sha256:466681e4208ecacc3fe5971e6891c9046f0336984896362411e76cc84cca2098","target":"record","created_at":"2026-07-04T23:57:44Z","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":"f4a125bad84fe41c8e42533e97a1c4be868ef4972366d0cbaa0ae845f8a7dce0","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2013-05-09T17:59:32Z","title_canon_sha256":"8261b5f0995e727c73cbb950382a0cf8f139466eb95438f7982280c0a2730e1d"},"schema_version":"1.0","source":{"id":"1305.2163","kind":"arxiv","version":2}},"canonical_sha256":"8e29fd44dd427a02a900cd3ef6c7ec7b2f915a2938508b998a35e1dfad436510","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"8e29fd44dd427a02a900cd3ef6c7ec7b2f915a2938508b998a35e1dfad436510","first_computed_at":"2026-07-04T23:57:44.398995Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-04T23:57:44.398995Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"baY37yHdpLgi5mwLlwo7msu93eXxQmKxbeS43BccoicHRcrjWxCy/CGe2W83pCbb1SD+1X637ZgXtIjqmLeLAQ==","signature_status":"signed_v1","signed_at":"2026-07-04T23:57:44.399428Z","signed_message":"canonical_sha256_bytes"},"source_id":"1305.2163","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:466681e4208ecacc3fe5971e6891c9046f0336984896362411e76cc84cca2098","sha256:cb86d8ae4d78e25d6a4f7eb5c2c17a1f7053612cc716742aa1514000fe186eed"],"state_sha256":"9fe8f88c3c2f3b281e5525ae343d2545763d1ca145bf69febc569079fc17c24d"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"7g+oApjVGzkZE4x4pGMllozwceYfLW4ex/wqQT1/mSaT159r16VjEfHMQoTWT1WH3NswtdWlLR8lV6NI64cdBQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-16T09:05:31.099011Z","bundle_sha256":"dc64d365126344aef64d02f0178dd3f86cdfa5dfc6091525279ab1a8a92e700b"}}