{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2025:FYBFQ3XVGEM2SZTBMPIZVZEBMI","short_pith_number":"pith:FYBFQ3XV","canonical_record":{"source":{"id":"2505.07200","kind":"arxiv","version":2},"metadata":{"license":"http://creativecommons.org/licenses/by-nc-nd/4.0/","primary_cat":"astro-ph.CO","submitted_at":"2025-05-12T03:15:12Z","cross_cats_sorted":[],"title_canon_sha256":"ea77c88e40b2f3eb3f76686168610d1f9666dcfd48a279a0d2ae40eeb17e174a","abstract_canon_sha256":"be5a649cacc1678f4bbe8ffdc3ae29cc4b74aaf2760541102f1ad08df1df9a30"},"schema_version":"1.0"},"canonical_sha256":"2e02586ef53119a9666163d19ae481620b28d4cf2e6d427e64e1ec8813cede9f","source":{"kind":"arxiv","id":"2505.07200","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2505.07200","created_at":"2026-07-05T11:21:46Z"},{"alias_kind":"arxiv_version","alias_value":"2505.07200v2","created_at":"2026-07-05T11:21:46Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2505.07200","created_at":"2026-07-05T11:21:46Z"},{"alias_kind":"pith_short_12","alias_value":"FYBFQ3XVGEM2","created_at":"2026-07-05T11:21:46Z"},{"alias_kind":"pith_short_16","alias_value":"FYBFQ3XVGEM2SZTB","created_at":"2026-07-05T11:21:46Z"},{"alias_kind":"pith_short_8","alias_value":"FYBFQ3XV","created_at":"2026-07-05T11:21:46Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2025:FYBFQ3XVGEM2SZTBMPIZVZEBMI","target":"record","payload":{"canonical_record":{"source":{"id":"2505.07200","kind":"arxiv","version":2},"metadata":{"license":"http://creativecommons.org/licenses/by-nc-nd/4.0/","primary_cat":"astro-ph.CO","submitted_at":"2025-05-12T03:15:12Z","cross_cats_sorted":[],"title_canon_sha256":"ea77c88e40b2f3eb3f76686168610d1f9666dcfd48a279a0d2ae40eeb17e174a","abstract_canon_sha256":"be5a649cacc1678f4bbe8ffdc3ae29cc4b74aaf2760541102f1ad08df1df9a30"},"schema_version":"1.0"},"canonical_sha256":"2e02586ef53119a9666163d19ae481620b28d4cf2e6d427e64e1ec8813cede9f","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T11:21:46.487181Z","signature_b64":"gLgvnQyKew4P/1xC2gAQ5ADitHFTZ4AcXURBIN84TPLj+joddhCWCndx5pAFco/zMEbLFL8tzG71ByfzDqAgAQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"2e02586ef53119a9666163d19ae481620b28d4cf2e6d427e64e1ec8813cede9f","last_reissued_at":"2026-07-05T11:21:46.486681Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T11:21:46.486681Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2505.07200","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":"2026-07-05T11:21:46Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"ZhNZHgLuBqFEeLl4Rpw091D926jTP1nhnoDw5hAtCcUHz9W2dVFR/zTPmpHw562H10p4lPihQi1uzPS8jR2WAg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-20T14:42:48.483817Z"},"content_sha256":"32fa97112f73ebe2cedf560739145fa6470b732c92ed236b0f52d4da3152013c","schema_version":"1.0","event_id":"sha256:32fa97112f73ebe2cedf560739145fa6470b732c92ed236b0f52d4da3152013c"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2025:FYBFQ3XVGEM2SZTBMPIZVZEBMI","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"New constraints on the values of the fundamental constants at a look-back time of 7.3 Gyr","license":"http://creativecommons.org/licenses/by-nc-nd/4.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.CO","authors_text":"Di Li, Francoise Combes, Minfeng Gu, Neeraj Gupta, Renzhi Su, Sebastien Muller, Stephen J. Curran","submitted_at":"2025-05-12T03:15:12Z","abstract_excerpt":"The study of redshifted spectral lines can provide a measure of the fundamental constants over large look-back times. Current grand unified theories predict an evolution in these constants and astronomical observations offer the only experimental measure of the values of the constants over large timescales. Of particular interest are the dimensionless constants: the fine structure constant ($\\alpha$), the proton-electron mass ratio ($\\mu$), and the proton g-factor ($g_p$), since these do not require a \"standard meterstick\". Here we present a re-analysis of the 18 cm hydroxyl (OH) lines at $z=0"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2505.07200","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/2505.07200/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":"2026-07-05T11:21:46Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"hWPwwD7SLJGLciv/j+d2w8BYkgx3m0Hpd5F2hHiLsrpqv+nA5iuSpdoLtGp4r5GEOWTO+aPZLcgyRLfklWxcAw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-20T14:42:48.484194Z"},"content_sha256":"428a6e99746ae7704fcd1a3a6d890053924a1d4b19a78daa9fcf8a1a7bd85126","schema_version":"1.0","event_id":"sha256:428a6e99746ae7704fcd1a3a6d890053924a1d4b19a78daa9fcf8a1a7bd85126"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/FYBFQ3XVGEM2SZTBMPIZVZEBMI/bundle.json","state_url":"https://pith.science/pith/FYBFQ3XVGEM2SZTBMPIZVZEBMI/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/FYBFQ3XVGEM2SZTBMPIZVZEBMI/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":"2026-08-20T14:42:48Z","links":{"resolver":"https://pith.science/pith/FYBFQ3XVGEM2SZTBMPIZVZEBMI","bundle":"https://pith.science/pith/FYBFQ3XVGEM2SZTBMPIZVZEBMI/bundle.json","state":"https://pith.science/pith/FYBFQ3XVGEM2SZTBMPIZVZEBMI/state.json","well_known_bundle":"https://pith.science/.well-known/pith/FYBFQ3XVGEM2SZTBMPIZVZEBMI/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2025:FYBFQ3XVGEM2SZTBMPIZVZEBMI","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":"be5a649cacc1678f4bbe8ffdc3ae29cc4b74aaf2760541102f1ad08df1df9a30","cross_cats_sorted":[],"license":"http://creativecommons.org/licenses/by-nc-nd/4.0/","primary_cat":"astro-ph.CO","submitted_at":"2025-05-12T03:15:12Z","title_canon_sha256":"ea77c88e40b2f3eb3f76686168610d1f9666dcfd48a279a0d2ae40eeb17e174a"},"schema_version":"1.0","source":{"id":"2505.07200","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2505.07200","created_at":"2026-07-05T11:21:46Z"},{"alias_kind":"arxiv_version","alias_value":"2505.07200v2","created_at":"2026-07-05T11:21:46Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2505.07200","created_at":"2026-07-05T11:21:46Z"},{"alias_kind":"pith_short_12","alias_value":"FYBFQ3XVGEM2","created_at":"2026-07-05T11:21:46Z"},{"alias_kind":"pith_short_16","alias_value":"FYBFQ3XVGEM2SZTB","created_at":"2026-07-05T11:21:46Z"},{"alias_kind":"pith_short_8","alias_value":"FYBFQ3XV","created_at":"2026-07-05T11:21:46Z"}],"graph_snapshots":[{"event_id":"sha256:428a6e99746ae7704fcd1a3a6d890053924a1d4b19a78daa9fcf8a1a7bd85126","target":"graph","created_at":"2026-07-05T11:21:46Z","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/2505.07200/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"The study of redshifted spectral lines can provide a measure of the fundamental constants over large look-back times. Current grand unified theories predict an evolution in these constants and astronomical observations offer the only experimental measure of the values of the constants over large timescales. Of particular interest are the dimensionless constants: the fine structure constant ($\\alpha$), the proton-electron mass ratio ($\\mu$), and the proton g-factor ($g_p$), since these do not require a \"standard meterstick\". Here we present a re-analysis of the 18 cm hydroxyl (OH) lines at $z=0","authors_text":"Di Li, Francoise Combes, Minfeng Gu, Neeraj Gupta, Renzhi Su, Sebastien Muller, Stephen J. Curran","cross_cats":[],"headline":"","license":"http://creativecommons.org/licenses/by-nc-nd/4.0/","primary_cat":"astro-ph.CO","submitted_at":"2025-05-12T03:15:12Z","title":"New constraints on the values of the fundamental constants at a look-back time of 7.3 Gyr"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2505.07200","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":"sha256:32fa97112f73ebe2cedf560739145fa6470b732c92ed236b0f52d4da3152013c","target":"record","created_at":"2026-07-05T11:21:46Z","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":"be5a649cacc1678f4bbe8ffdc3ae29cc4b74aaf2760541102f1ad08df1df9a30","cross_cats_sorted":[],"license":"http://creativecommons.org/licenses/by-nc-nd/4.0/","primary_cat":"astro-ph.CO","submitted_at":"2025-05-12T03:15:12Z","title_canon_sha256":"ea77c88e40b2f3eb3f76686168610d1f9666dcfd48a279a0d2ae40eeb17e174a"},"schema_version":"1.0","source":{"id":"2505.07200","kind":"arxiv","version":2}},"canonical_sha256":"2e02586ef53119a9666163d19ae481620b28d4cf2e6d427e64e1ec8813cede9f","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"2e02586ef53119a9666163d19ae481620b28d4cf2e6d427e64e1ec8813cede9f","first_computed_at":"2026-07-05T11:21:46.486681Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T11:21:46.486681Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"gLgvnQyKew4P/1xC2gAQ5ADitHFTZ4AcXURBIN84TPLj+joddhCWCndx5pAFco/zMEbLFL8tzG71ByfzDqAgAQ==","signature_status":"signed_v1","signed_at":"2026-07-05T11:21:46.487181Z","signed_message":"canonical_sha256_bytes"},"source_id":"2505.07200","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:32fa97112f73ebe2cedf560739145fa6470b732c92ed236b0f52d4da3152013c","sha256:428a6e99746ae7704fcd1a3a6d890053924a1d4b19a78daa9fcf8a1a7bd85126"],"state_sha256":"8a3c5ee61d01f9e3e382864d26c41109c95264c1f46c4a7ee29f407c2317cdf9"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"58EhCA8THyOlantjh+q9gg0T6SioNsJOWimU9HCTo7rkqxq8AOvAskubwMo057is42y4MnzlNCiCXoUKB2LTAw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-20T14:42:48.486497Z","bundle_sha256":"8c602e479aba75ff3a2d261b23ed094273165aec70a512172c7fc435864268b8"}}