{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2025:PEYLYI4TQJZ22JYYMLKFGU2FIZ","short_pith_number":"pith:PEYLYI4T","canonical_record":{"source":{"id":"2509.01667","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"astro-ph.CO","submitted_at":"2025-09-01T18:00:01Z","cross_cats_sorted":["gr-qc"],"title_canon_sha256":"2837996e7024a5ff1409b2dcae46696eaa753a4f3a9bffbe1531e061ddf24be2","abstract_canon_sha256":"99a4f1627c68c5fbd3dcb39d117cc557c25890f1a9416050f754a555a49f787f"},"schema_version":"1.0"},"canonical_sha256":"7930bc23938273ad271862d4535345467167e70226fd6d0b3632992a59abbe50","source":{"kind":"arxiv","id":"2509.01667","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2509.01667","created_at":"2026-07-05T12:03:05Z"},{"alias_kind":"arxiv_version","alias_value":"2509.01667v1","created_at":"2026-07-05T12:03:05Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2509.01667","created_at":"2026-07-05T12:03:05Z"},{"alias_kind":"pith_short_12","alias_value":"PEYLYI4TQJZ2","created_at":"2026-07-05T12:03:05Z"},{"alias_kind":"pith_short_16","alias_value":"PEYLYI4TQJZ22JYY","created_at":"2026-07-05T12:03:05Z"},{"alias_kind":"pith_short_8","alias_value":"PEYLYI4T","created_at":"2026-07-05T12:03:05Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2025:PEYLYI4TQJZ22JYYMLKFGU2FIZ","target":"record","payload":{"canonical_record":{"source":{"id":"2509.01667","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"astro-ph.CO","submitted_at":"2025-09-01T18:00:01Z","cross_cats_sorted":["gr-qc"],"title_canon_sha256":"2837996e7024a5ff1409b2dcae46696eaa753a4f3a9bffbe1531e061ddf24be2","abstract_canon_sha256":"99a4f1627c68c5fbd3dcb39d117cc557c25890f1a9416050f754a555a49f787f"},"schema_version":"1.0"},"canonical_sha256":"7930bc23938273ad271862d4535345467167e70226fd6d0b3632992a59abbe50","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T12:03:05.628116Z","signature_b64":"Sp/tRfFAWW8lBcEDZtsX40TrTGCV3EgBkF1T4faZgXdMqnjWsUTaw1TM4gVHxRKGgImFu7XRLCBlYc5avIdNCg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"7930bc23938273ad271862d4535345467167e70226fd6d0b3632992a59abbe50","last_reissued_at":"2026-07-05T12:03:05.627540Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T12:03:05.627540Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2509.01667","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":"2026-07-05T12:03:05Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"ZlSjJjbHOClhiYCcQa0Vredd/IA9PgnPc4x/K6XVj5AECKnjJuOL7nN5cQ7Ws3ZNsIMuw82eiriErwChdqoxAw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-07T04:45:06.923052Z"},"content_sha256":"38ab2a1946002882d10f0981db811e4ef622f17064e509ba8a92d481e0b4625d","schema_version":"1.0","event_id":"sha256:38ab2a1946002882d10f0981db811e4ef622f17064e509ba8a92d481e0b4625d"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2025:PEYLYI4TQJZ22JYYMLKFGU2FIZ","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"The Perfect Host: JWST Cepheid Observations in a Background-Free SN Ia Host Confirm No Bias in Hubble-Constant Measurements","license":"http://creativecommons.org/licenses/by/4.0/","headline":"","cross_cats":["gr-qc"],"primary_cat":"astro-ph.CO","authors_text":"Adam G. Riess, Alexei V. Filippenko, Dan Scolnic, Gagandeep S. Anand, Louise Breuval, Lucas M. Macri, Siyang Li, Stefano Casertano, Thomas G. Brink, Wenlong Yuan, Yukei S. Murakami","submitted_at":"2025-09-01T18:00:01Z","abstract_excerpt":"Cycle 1 JWST observations of Cepheids in SN Ia hosts resolved their red-giant-dominated NIR backgrounds, sharply reducing crowding and showing that photometric bias in lower-resolution HST data does not account for the Hubble tension. We present Cycle 2 JWST observations of >100 Cepheids in NGC 3447, a unique system that pushes this test to the limit by transitioning from low to no background contamination. NGC 3447, an SN Ia host at D~25 Mpc, is an interacting pair comprising (i) a spiral with mixed stellar populations, typical of H0 calibrators, and (ii) a young, star-forming companion (NGC "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2509.01667","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/2509.01667/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":"2026-07-05T12:03:05Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"UngIpH6rs+srOgEFURvLcV9luIasoaKE4ELpDbw2HRA8lD53a1HjDwcjfIJEYUQRpihdibj5Bvmr8C58mXHDCA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-07T04:45:06.923554Z"},"content_sha256":"8ce23311a97fc1e11807ecb66be7dc5cd068c77e2fd0348b8f8e1bf517a46e0b","schema_version":"1.0","event_id":"sha256:8ce23311a97fc1e11807ecb66be7dc5cd068c77e2fd0348b8f8e1bf517a46e0b"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/PEYLYI4TQJZ22JYYMLKFGU2FIZ/bundle.json","state_url":"https://pith.science/pith/PEYLYI4TQJZ22JYYMLKFGU2FIZ/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/PEYLYI4TQJZ22JYYMLKFGU2FIZ/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":"2026-08-07T04:45:06Z","links":{"resolver":"https://pith.science/pith/PEYLYI4TQJZ22JYYMLKFGU2FIZ","bundle":"https://pith.science/pith/PEYLYI4TQJZ22JYYMLKFGU2FIZ/bundle.json","state":"https://pith.science/pith/PEYLYI4TQJZ22JYYMLKFGU2FIZ/state.json","well_known_bundle":"https://pith.science/.well-known/pith/PEYLYI4TQJZ22JYYMLKFGU2FIZ/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2025:PEYLYI4TQJZ22JYYMLKFGU2FIZ","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":"99a4f1627c68c5fbd3dcb39d117cc557c25890f1a9416050f754a555a49f787f","cross_cats_sorted":["gr-qc"],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"astro-ph.CO","submitted_at":"2025-09-01T18:00:01Z","title_canon_sha256":"2837996e7024a5ff1409b2dcae46696eaa753a4f3a9bffbe1531e061ddf24be2"},"schema_version":"1.0","source":{"id":"2509.01667","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2509.01667","created_at":"2026-07-05T12:03:05Z"},{"alias_kind":"arxiv_version","alias_value":"2509.01667v1","created_at":"2026-07-05T12:03:05Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2509.01667","created_at":"2026-07-05T12:03:05Z"},{"alias_kind":"pith_short_12","alias_value":"PEYLYI4TQJZ2","created_at":"2026-07-05T12:03:05Z"},{"alias_kind":"pith_short_16","alias_value":"PEYLYI4TQJZ22JYY","created_at":"2026-07-05T12:03:05Z"},{"alias_kind":"pith_short_8","alias_value":"PEYLYI4T","created_at":"2026-07-05T12:03:05Z"}],"graph_snapshots":[{"event_id":"sha256:8ce23311a97fc1e11807ecb66be7dc5cd068c77e2fd0348b8f8e1bf517a46e0b","target":"graph","created_at":"2026-07-05T12:03:05Z","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/2509.01667/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"Cycle 1 JWST observations of Cepheids in SN Ia hosts resolved their red-giant-dominated NIR backgrounds, sharply reducing crowding and showing that photometric bias in lower-resolution HST data does not account for the Hubble tension. We present Cycle 2 JWST observations of >100 Cepheids in NGC 3447, a unique system that pushes this test to the limit by transitioning from low to no background contamination. NGC 3447, an SN Ia host at D~25 Mpc, is an interacting pair comprising (i) a spiral with mixed stellar populations, typical of H0 calibrators, and (ii) a young, star-forming companion (NGC ","authors_text":"Adam G. Riess, Alexei V. Filippenko, Dan Scolnic, Gagandeep S. Anand, Louise Breuval, Lucas M. Macri, Siyang Li, Stefano Casertano, Thomas G. Brink, Wenlong Yuan, Yukei S. Murakami","cross_cats":["gr-qc"],"headline":"","license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"astro-ph.CO","submitted_at":"2025-09-01T18:00:01Z","title":"The Perfect Host: JWST Cepheid Observations in a Background-Free SN Ia Host Confirm No Bias in Hubble-Constant Measurements"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2509.01667","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":"sha256:38ab2a1946002882d10f0981db811e4ef622f17064e509ba8a92d481e0b4625d","target":"record","created_at":"2026-07-05T12:03:05Z","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":"99a4f1627c68c5fbd3dcb39d117cc557c25890f1a9416050f754a555a49f787f","cross_cats_sorted":["gr-qc"],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"astro-ph.CO","submitted_at":"2025-09-01T18:00:01Z","title_canon_sha256":"2837996e7024a5ff1409b2dcae46696eaa753a4f3a9bffbe1531e061ddf24be2"},"schema_version":"1.0","source":{"id":"2509.01667","kind":"arxiv","version":1}},"canonical_sha256":"7930bc23938273ad271862d4535345467167e70226fd6d0b3632992a59abbe50","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"7930bc23938273ad271862d4535345467167e70226fd6d0b3632992a59abbe50","first_computed_at":"2026-07-05T12:03:05.627540Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T12:03:05.627540Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"Sp/tRfFAWW8lBcEDZtsX40TrTGCV3EgBkF1T4faZgXdMqnjWsUTaw1TM4gVHxRKGgImFu7XRLCBlYc5avIdNCg==","signature_status":"signed_v1","signed_at":"2026-07-05T12:03:05.628116Z","signed_message":"canonical_sha256_bytes"},"source_id":"2509.01667","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:38ab2a1946002882d10f0981db811e4ef622f17064e509ba8a92d481e0b4625d","sha256:8ce23311a97fc1e11807ecb66be7dc5cd068c77e2fd0348b8f8e1bf517a46e0b"],"state_sha256":"0ce1ecf3db5caee0ae29b0b0133f1d78fc12ac54cf888b1baa6e86a3738b6a5a"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"MdKDPDMIMhMB4Pv4tO3JgppzkZFG4kbRYz1fXCz1Rq6ugIhyBngU8Y/HS5B7UQ5UNBs4iGJKkitNOtPri8O8BA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-07T04:45:06.927246Z","bundle_sha256":"22d7d8b6a2aa7d54906a2e6df45b7c952840d501cead69030c7a0e95283e9742"}}