{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2021:6ZAPBWYFJWKVSGV2FPSCKMJFQS","short_pith_number":"pith:6ZAPBWYF","canonical_record":{"source":{"id":"2109.01161","kind":"arxiv","version":2},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"astro-ph.CO","submitted_at":"2021-09-02T18:09:34Z","cross_cats_sorted":[],"title_canon_sha256":"baee362a01a01915353fc897481ff987e799a087c08c90fa12977f8708a8934d","abstract_canon_sha256":"382209b62f2fc98737191c4129be26697d5513a5d378daeaf7d3ffe244ba5792"},"schema_version":"1.0"},"canonical_sha256":"f640f0db054d95591aba2be425312584bb9d71078220977d409015c6a4ad8778","source":{"kind":"arxiv","id":"2109.01161","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2109.01161","created_at":"2026-07-05T03:40:44Z"},{"alias_kind":"arxiv_version","alias_value":"2109.01161v2","created_at":"2026-07-05T03:40:44Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2109.01161","created_at":"2026-07-05T03:40:44Z"},{"alias_kind":"pith_short_12","alias_value":"6ZAPBWYFJWKV","created_at":"2026-07-05T03:40:44Z"},{"alias_kind":"pith_short_16","alias_value":"6ZAPBWYFJWKVSGV2","created_at":"2026-07-05T03:40:44Z"},{"alias_kind":"pith_short_8","alias_value":"6ZAPBWYF","created_at":"2026-07-05T03:40:44Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2021:6ZAPBWYFJWKVSGV2FPSCKMJFQS","target":"record","payload":{"canonical_record":{"source":{"id":"2109.01161","kind":"arxiv","version":2},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"astro-ph.CO","submitted_at":"2021-09-02T18:09:34Z","cross_cats_sorted":[],"title_canon_sha256":"baee362a01a01915353fc897481ff987e799a087c08c90fa12977f8708a8934d","abstract_canon_sha256":"382209b62f2fc98737191c4129be26697d5513a5d378daeaf7d3ffe244ba5792"},"schema_version":"1.0"},"canonical_sha256":"f640f0db054d95591aba2be425312584bb9d71078220977d409015c6a4ad8778","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T03:40:44.198695Z","signature_b64":"kCuOJFJgXVZ4XfykzAHaocjZ66mqG9UYZa/Y3e0vW1zCEYD+nHtL4IKQDvV4MgUe4AX0KjUSDjPErtDzwVWkDA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"f640f0db054d95591aba2be425312584bb9d71078220977d409015c6a4ad8778","last_reissued_at":"2026-07-05T03:40:44.198254Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T03:40:44.198254Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2109.01161","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":"2026-07-05T03:40:44Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"jsRg2zOcLpDlB99dkUFn62n4wLUkOq+n3f+givuP48NLak7FFpIUnCZMDVE6bCrk0H6VtDucTL/Lcxe9xH4FBQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-09T15:41:16.729863Z"},"content_sha256":"7afb852dfbaddf881d51e6127d1ef8cfeb4ff9aba6c656f8592d93106f29cbfc","schema_version":"1.0","event_id":"sha256:7afb852dfbaddf881d51e6127d1ef8cfeb4ff9aba6c656f8592d93106f29cbfc"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2021:6ZAPBWYFJWKVSGV2FPSCKMJFQS","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"A buyer's guide to the Hubble Constant","license":"http://creativecommons.org/licenses/by/4.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.CO","authors_text":"Ofer Lahav (UCL), Pablo Lemos (UCL, Paul Shah (UCL), Sussex U.)","submitted_at":"2021-09-02T18:09:34Z","abstract_excerpt":"Since the expansion of the universe was first established by Edwin Hubble and Georges Lemaitre about a century ago, the Hubble constant H0 which measures its rate has been of great interest to astronomers. Besides being interesting in its own right, few properties of the universe can be deduced without it. In the last decade a significant gap has emerged between different methods of measuring it, some anchored in the nearby universe, others at cosmological distances. The SH0ES team has found $H_0 = 73.2 \\pm 1.3$ km sec$^{-1}$ Mpc$^{-1}$ locally, whereas the value found for the early universe b"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2109.01161","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/2109.01161/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":"2026-07-05T03:40:44Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"m5T5OEpHPsLIYeUmTW23CdqesuLHXAatsQz1hayufObKUaZPg4MRUk6Fze1+jcCrhEEfpb4UxNjQu1su8pwwAQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-09T15:41:16.730752Z"},"content_sha256":"df053521122c700c559bdce438061652585ad27372bbc3b1490a273ab19b898a","schema_version":"1.0","event_id":"sha256:df053521122c700c559bdce438061652585ad27372bbc3b1490a273ab19b898a"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/6ZAPBWYFJWKVSGV2FPSCKMJFQS/bundle.json","state_url":"https://pith.science/pith/6ZAPBWYFJWKVSGV2FPSCKMJFQS/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/6ZAPBWYFJWKVSGV2FPSCKMJFQS/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":"2026-08-09T15:41:16Z","links":{"resolver":"https://pith.science/pith/6ZAPBWYFJWKVSGV2FPSCKMJFQS","bundle":"https://pith.science/pith/6ZAPBWYFJWKVSGV2FPSCKMJFQS/bundle.json","state":"https://pith.science/pith/6ZAPBWYFJWKVSGV2FPSCKMJFQS/state.json","well_known_bundle":"https://pith.science/.well-known/pith/6ZAPBWYFJWKVSGV2FPSCKMJFQS/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2021:6ZAPBWYFJWKVSGV2FPSCKMJFQS","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":"382209b62f2fc98737191c4129be26697d5513a5d378daeaf7d3ffe244ba5792","cross_cats_sorted":[],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"astro-ph.CO","submitted_at":"2021-09-02T18:09:34Z","title_canon_sha256":"baee362a01a01915353fc897481ff987e799a087c08c90fa12977f8708a8934d"},"schema_version":"1.0","source":{"id":"2109.01161","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2109.01161","created_at":"2026-07-05T03:40:44Z"},{"alias_kind":"arxiv_version","alias_value":"2109.01161v2","created_at":"2026-07-05T03:40:44Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2109.01161","created_at":"2026-07-05T03:40:44Z"},{"alias_kind":"pith_short_12","alias_value":"6ZAPBWYFJWKV","created_at":"2026-07-05T03:40:44Z"},{"alias_kind":"pith_short_16","alias_value":"6ZAPBWYFJWKVSGV2","created_at":"2026-07-05T03:40:44Z"},{"alias_kind":"pith_short_8","alias_value":"6ZAPBWYF","created_at":"2026-07-05T03:40:44Z"}],"graph_snapshots":[{"event_id":"sha256:df053521122c700c559bdce438061652585ad27372bbc3b1490a273ab19b898a","target":"graph","created_at":"2026-07-05T03:40:44Z","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/2109.01161/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"Since the expansion of the universe was first established by Edwin Hubble and Georges Lemaitre about a century ago, the Hubble constant H0 which measures its rate has been of great interest to astronomers. Besides being interesting in its own right, few properties of the universe can be deduced without it. In the last decade a significant gap has emerged between different methods of measuring it, some anchored in the nearby universe, others at cosmological distances. The SH0ES team has found $H_0 = 73.2 \\pm 1.3$ km sec$^{-1}$ Mpc$^{-1}$ locally, whereas the value found for the early universe b","authors_text":"Ofer Lahav (UCL), Pablo Lemos (UCL, Paul Shah (UCL), Sussex U.)","cross_cats":[],"headline":"","license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"astro-ph.CO","submitted_at":"2021-09-02T18:09:34Z","title":"A buyer's guide to the Hubble Constant"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2109.01161","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":"sha256:7afb852dfbaddf881d51e6127d1ef8cfeb4ff9aba6c656f8592d93106f29cbfc","target":"record","created_at":"2026-07-05T03:40:44Z","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":"382209b62f2fc98737191c4129be26697d5513a5d378daeaf7d3ffe244ba5792","cross_cats_sorted":[],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"astro-ph.CO","submitted_at":"2021-09-02T18:09:34Z","title_canon_sha256":"baee362a01a01915353fc897481ff987e799a087c08c90fa12977f8708a8934d"},"schema_version":"1.0","source":{"id":"2109.01161","kind":"arxiv","version":2}},"canonical_sha256":"f640f0db054d95591aba2be425312584bb9d71078220977d409015c6a4ad8778","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"f640f0db054d95591aba2be425312584bb9d71078220977d409015c6a4ad8778","first_computed_at":"2026-07-05T03:40:44.198254Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T03:40:44.198254Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"kCuOJFJgXVZ4XfykzAHaocjZ66mqG9UYZa/Y3e0vW1zCEYD+nHtL4IKQDvV4MgUe4AX0KjUSDjPErtDzwVWkDA==","signature_status":"signed_v1","signed_at":"2026-07-05T03:40:44.198695Z","signed_message":"canonical_sha256_bytes"},"source_id":"2109.01161","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:7afb852dfbaddf881d51e6127d1ef8cfeb4ff9aba6c656f8592d93106f29cbfc","sha256:df053521122c700c559bdce438061652585ad27372bbc3b1490a273ab19b898a"],"state_sha256":"139827eac1af198a1bfbf8913f3674cc6a92018c0853c1a086041c24150dfb8b"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"jy8UTHV0VQojhc7iWZDnrVJUp1ZvnPBURuUJ1Nlyc/6Z4x7zwQjIU4nhxiZFG5kBhqR/vIlhR9GUoUsUzk1qAw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-09T15:41:16.735256Z","bundle_sha256":"13907099c4bfb6a2acebe9d2d98e0815cf9974be480bc8789e830ef883961bca"}}