{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2015:GK62VLY4RUPYIQSJDBMOEZM53J","short_pith_number":"pith:GK62VLY4","canonical_record":{"source":{"id":"1510.02087","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2015-10-07T18:54:09Z","cross_cats_sorted":["astro-ph.HE"],"title_canon_sha256":"8001ababeeba37b34f03ac94c13525192c82c1b06a43281d31afc8b28a8782f3","abstract_canon_sha256":"dcdf735485d0c777de67e82d09357f4c7f526a2e34a75ec034b48e84ed9bd01c"},"schema_version":"1.0"},"canonical_sha256":"32bdaaaf1c8d1f8442491858e2659dda7249fa50fc3e1d687692ebff9fa0f355","source":{"kind":"arxiv","id":"1510.02087","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1510.02087","created_at":"2026-05-18T01:30:48Z"},{"alias_kind":"arxiv_version","alias_value":"1510.02087v1","created_at":"2026-05-18T01:30:48Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1510.02087","created_at":"2026-05-18T01:30:48Z"},{"alias_kind":"pith_short_12","alias_value":"GK62VLY4RUPY","created_at":"2026-05-18T12:29:22Z"},{"alias_kind":"pith_short_16","alias_value":"GK62VLY4RUPYIQSJ","created_at":"2026-05-18T12:29:22Z"},{"alias_kind":"pith_short_8","alias_value":"GK62VLY4","created_at":"2026-05-18T12:29:22Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2015:GK62VLY4RUPYIQSJDBMOEZM53J","target":"record","payload":{"canonical_record":{"source":{"id":"1510.02087","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2015-10-07T18:54:09Z","cross_cats_sorted":["astro-ph.HE"],"title_canon_sha256":"8001ababeeba37b34f03ac94c13525192c82c1b06a43281d31afc8b28a8782f3","abstract_canon_sha256":"dcdf735485d0c777de67e82d09357f4c7f526a2e34a75ec034b48e84ed9bd01c"},"schema_version":"1.0"},"canonical_sha256":"32bdaaaf1c8d1f8442491858e2659dda7249fa50fc3e1d687692ebff9fa0f355","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:30:48.525912Z","signature_b64":"OdaIksEi8pxi3axVqB+rVur27mdQPgaLkEx6QMHy8LSekLroYrTgLz9qEo7bgcyHWoLK6MmDt0WEI9NOOnBzCA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"32bdaaaf1c8d1f8442491858e2659dda7249fa50fc3e1d687692ebff9fa0f355","last_reissued_at":"2026-05-18T01:30:48.525296Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:30:48.525296Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1510.02087","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":"2026-05-18T01:30:48Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"JNEd755h018G5eE2wYZxLOdGx/d8EtdlY71DMwB/MDaUSViXGC1NaGOai0zl+ZNHJcPjCzN7Eadv1zSG4maWDQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-08T02:42:25.920089Z"},"content_sha256":"d374435c6dbfd2f83c9864e0966d723488864382cffd9d6996469cf25e09f947","schema_version":"1.0","event_id":"sha256:d374435c6dbfd2f83c9864e0966d723488864382cffd9d6996469cf25e09f947"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2015:GK62VLY4RUPYIQSJDBMOEZM53J","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"What is the redshift of the gamma- ray BL Lac source S4 0954+65?","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.HE"],"primary_cat":"astro-ph.CO","authors_text":"A. Treves, D. Reverte Paya, M. Landoni, R. Falomo, R. Scarpa","submitted_at":"2015-10-07T18:54:09Z","abstract_excerpt":"High signal-to-noise ratio spectroscopic observations of the BL Lac object S4 0954+65 at the alleged redshift z = 0.367 are presented. This source was detected at gamma frequencies by MAGIC (TeV) and FERMI (GeV) telescopes during a remarkable outburst that occurred in February 2015, making the determination of its distance particularly relevant for our understanding of the properties of the Extragalactic Background Light. Contrary to previous reports on the redshift, we found that the optical spectrum is featureless at an equivalent width limit of \\sim 0.1 Ang. A critical analysis of the exist"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1510.02087","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":""},"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":"2026-05-18T01:30:48Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"HJwwyPASUk1+emm46F3IUNypE6FNm8L4dEfP5WcbtYl9zCqssgTEBztB0fz1E4tS3AELSXLUDLo+HGcgwPgHAg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-08T02:42:25.920766Z"},"content_sha256":"6b84bab7ed8e054d4098a380f50a4297a97c50ee299e692050fc2e540cffca3c","schema_version":"1.0","event_id":"sha256:6b84bab7ed8e054d4098a380f50a4297a97c50ee299e692050fc2e540cffca3c"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/GK62VLY4RUPYIQSJDBMOEZM53J/bundle.json","state_url":"https://pith.science/pith/GK62VLY4RUPYIQSJDBMOEZM53J/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/GK62VLY4RUPYIQSJDBMOEZM53J/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":"2026-06-08T02:42:25Z","links":{"resolver":"https://pith.science/pith/GK62VLY4RUPYIQSJDBMOEZM53J","bundle":"https://pith.science/pith/GK62VLY4RUPYIQSJDBMOEZM53J/bundle.json","state":"https://pith.science/pith/GK62VLY4RUPYIQSJDBMOEZM53J/state.json","well_known_bundle":"https://pith.science/.well-known/pith/GK62VLY4RUPYIQSJDBMOEZM53J/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2015:GK62VLY4RUPYIQSJDBMOEZM53J","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":"dcdf735485d0c777de67e82d09357f4c7f526a2e34a75ec034b48e84ed9bd01c","cross_cats_sorted":["astro-ph.HE"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2015-10-07T18:54:09Z","title_canon_sha256":"8001ababeeba37b34f03ac94c13525192c82c1b06a43281d31afc8b28a8782f3"},"schema_version":"1.0","source":{"id":"1510.02087","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1510.02087","created_at":"2026-05-18T01:30:48Z"},{"alias_kind":"arxiv_version","alias_value":"1510.02087v1","created_at":"2026-05-18T01:30:48Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1510.02087","created_at":"2026-05-18T01:30:48Z"},{"alias_kind":"pith_short_12","alias_value":"GK62VLY4RUPY","created_at":"2026-05-18T12:29:22Z"},{"alias_kind":"pith_short_16","alias_value":"GK62VLY4RUPYIQSJ","created_at":"2026-05-18T12:29:22Z"},{"alias_kind":"pith_short_8","alias_value":"GK62VLY4","created_at":"2026-05-18T12:29:22Z"}],"graph_snapshots":[{"event_id":"sha256:6b84bab7ed8e054d4098a380f50a4297a97c50ee299e692050fc2e540cffca3c","target":"graph","created_at":"2026-05-18T01:30:48Z","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":"High signal-to-noise ratio spectroscopic observations of the BL Lac object S4 0954+65 at the alleged redshift z = 0.367 are presented. This source was detected at gamma frequencies by MAGIC (TeV) and FERMI (GeV) telescopes during a remarkable outburst that occurred in February 2015, making the determination of its distance particularly relevant for our understanding of the properties of the Extragalactic Background Light. Contrary to previous reports on the redshift, we found that the optical spectrum is featureless at an equivalent width limit of \\sim 0.1 Ang. A critical analysis of the exist","authors_text":"A. Treves, D. Reverte Paya, M. Landoni, R. Falomo, R. Scarpa","cross_cats":["astro-ph.HE"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2015-10-07T18:54:09Z","title":"What is the redshift of the gamma- ray BL Lac source S4 0954+65?"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1510.02087","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:d374435c6dbfd2f83c9864e0966d723488864382cffd9d6996469cf25e09f947","target":"record","created_at":"2026-05-18T01:30:48Z","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":"dcdf735485d0c777de67e82d09357f4c7f526a2e34a75ec034b48e84ed9bd01c","cross_cats_sorted":["astro-ph.HE"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2015-10-07T18:54:09Z","title_canon_sha256":"8001ababeeba37b34f03ac94c13525192c82c1b06a43281d31afc8b28a8782f3"},"schema_version":"1.0","source":{"id":"1510.02087","kind":"arxiv","version":1}},"canonical_sha256":"32bdaaaf1c8d1f8442491858e2659dda7249fa50fc3e1d687692ebff9fa0f355","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"32bdaaaf1c8d1f8442491858e2659dda7249fa50fc3e1d687692ebff9fa0f355","first_computed_at":"2026-05-18T01:30:48.525296Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:30:48.525296Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"OdaIksEi8pxi3axVqB+rVur27mdQPgaLkEx6QMHy8LSekLroYrTgLz9qEo7bgcyHWoLK6MmDt0WEI9NOOnBzCA==","signature_status":"signed_v1","signed_at":"2026-05-18T01:30:48.525912Z","signed_message":"canonical_sha256_bytes"},"source_id":"1510.02087","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:d374435c6dbfd2f83c9864e0966d723488864382cffd9d6996469cf25e09f947","sha256:6b84bab7ed8e054d4098a380f50a4297a97c50ee299e692050fc2e540cffca3c"],"state_sha256":"9229056279495972949578594ce395fa5f80a2e31bf4e97d298ae5f23f59733e"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"EQL4YADdqjHSVg/Y0qDVBxxIkJrGTuZ8aM0zSeZP+YrCKveJoWzNEFumglCQwynckM7Wc3nxOLofCDObPdTICA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-08T02:42:25.925162Z","bundle_sha256":"1655fcedc0a67e983df92199433882cff077399524f8054433ab6fbd8e1a4e3d"}}