{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2025:W5E7KB4AFVJW5SVVJJLNTPMSQE","short_pith_number":"pith:W5E7KB4A","canonical_record":{"source":{"id":"2506.18972","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"astro-ph.SR","submitted_at":"2025-06-23T18:00:01Z","cross_cats_sorted":[],"title_canon_sha256":"af6623ad68ae1eb4c8be1458e25d711d7ec8a04e1011d47972fb9deb2fa6d699","abstract_canon_sha256":"c2ca7862ae8047b0a153988b08f732edaedd4ed47247d8c0ab71a399e2f4279c"},"schema_version":"1.0"},"canonical_sha256":"b749f507802d536ecab54a56d9bd9281079a33ae03409867c827c69fb343c9a7","source":{"kind":"arxiv","id":"2506.18972","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2506.18972","created_at":"2026-07-05T11:26:07Z"},{"alias_kind":"arxiv_version","alias_value":"2506.18972v1","created_at":"2026-07-05T11:26:07Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2506.18972","created_at":"2026-07-05T11:26:07Z"},{"alias_kind":"pith_short_12","alias_value":"W5E7KB4AFVJW","created_at":"2026-07-05T11:26:07Z"},{"alias_kind":"pith_short_16","alias_value":"W5E7KB4AFVJW5SVV","created_at":"2026-07-05T11:26:07Z"},{"alias_kind":"pith_short_8","alias_value":"W5E7KB4A","created_at":"2026-07-05T11:26:07Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2025:W5E7KB4AFVJW5SVVJJLNTPMSQE","target":"record","payload":{"canonical_record":{"source":{"id":"2506.18972","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"astro-ph.SR","submitted_at":"2025-06-23T18:00:01Z","cross_cats_sorted":[],"title_canon_sha256":"af6623ad68ae1eb4c8be1458e25d711d7ec8a04e1011d47972fb9deb2fa6d699","abstract_canon_sha256":"c2ca7862ae8047b0a153988b08f732edaedd4ed47247d8c0ab71a399e2f4279c"},"schema_version":"1.0"},"canonical_sha256":"b749f507802d536ecab54a56d9bd9281079a33ae03409867c827c69fb343c9a7","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T11:26:07.399249Z","signature_b64":"UUMGR/2KCpgf/aPlFOD+1Aut2KaTqlc4UtkGtIEluF+y4dXqTx/dqlDTdfsxTLfLa9nhG3cWWlt6A5LwJ9jwAA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"b749f507802d536ecab54a56d9bd9281079a33ae03409867c827c69fb343c9a7","last_reissued_at":"2026-07-05T11:26:07.398782Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T11:26:07.398782Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2506.18972","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":"2026-07-05T11:26:07Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"6kt/ZHQyeeSPQLOABeoy7BY42G2ZOMVkCeFAnLrDzv3hDQmf9Js6s5vX8O7lq0FcjHHeYlW4pOU5Bw5STzgRBw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-19T18:37:15.102733Z"},"content_sha256":"07e5647ac23c428ab7b37f10451e66037a8fa9c85757796c3ab2956994597162","schema_version":"1.0","event_id":"sha256:07e5647ac23c428ab7b37f10451e66037a8fa9c85757796c3ab2956994597162"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2025:W5E7KB4AFVJW5SVVJJLNTPMSQE","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"The Relationship of Stellar Radius Inflation to Rotation and Magnetic Starspots at 10--670 Myr","license":"http://creativecommons.org/licenses/by/4.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.SR","authors_text":"Keivan G. Stassun, Lyra Cao","submitted_at":"2025-06-23T18:00:01Z","abstract_excerpt":"Active, low-mass stars are widely observed to have radii that are larger than predicted by standard stellar models. Proposed mechanisms for this radius inflation generally involve stellar magnetism, either in the form of added pressure support in the outer layers and/or suppression of convection via starspots. We have assembled a large sample of 261 low-mass stars in the young clusters Upper Scorpius, $\\alpha$ Persei, Pleiades, and Praesepe (spanning ages 10--670 Myr) for which the data exist to empirically measure the stellar radii, rotation periods, and starspot covering fractions. We find a"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2506.18972","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/2506.18972/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":"2026-07-05T11:26:07Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"5Lq8s6LFiIv9p79qg2ygp0hPk1vyauhLDvQ0lyfUPD7UCSN0VLi4DT2ed7dMxl5nuwxcPUPyfS81VqEs3BeVCg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-19T18:37:15.103444Z"},"content_sha256":"968185978681e3793a72da797339d9bd242ec535c18572dba46bf67ed4c18ac8","schema_version":"1.0","event_id":"sha256:968185978681e3793a72da797339d9bd242ec535c18572dba46bf67ed4c18ac8"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/W5E7KB4AFVJW5SVVJJLNTPMSQE/bundle.json","state_url":"https://pith.science/pith/W5E7KB4AFVJW5SVVJJLNTPMSQE/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/W5E7KB4AFVJW5SVVJJLNTPMSQE/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":"2026-08-19T18:37:15Z","links":{"resolver":"https://pith.science/pith/W5E7KB4AFVJW5SVVJJLNTPMSQE","bundle":"https://pith.science/pith/W5E7KB4AFVJW5SVVJJLNTPMSQE/bundle.json","state":"https://pith.science/pith/W5E7KB4AFVJW5SVVJJLNTPMSQE/state.json","well_known_bundle":"https://pith.science/.well-known/pith/W5E7KB4AFVJW5SVVJJLNTPMSQE/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2025:W5E7KB4AFVJW5SVVJJLNTPMSQE","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":"c2ca7862ae8047b0a153988b08f732edaedd4ed47247d8c0ab71a399e2f4279c","cross_cats_sorted":[],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"astro-ph.SR","submitted_at":"2025-06-23T18:00:01Z","title_canon_sha256":"af6623ad68ae1eb4c8be1458e25d711d7ec8a04e1011d47972fb9deb2fa6d699"},"schema_version":"1.0","source":{"id":"2506.18972","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2506.18972","created_at":"2026-07-05T11:26:07Z"},{"alias_kind":"arxiv_version","alias_value":"2506.18972v1","created_at":"2026-07-05T11:26:07Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2506.18972","created_at":"2026-07-05T11:26:07Z"},{"alias_kind":"pith_short_12","alias_value":"W5E7KB4AFVJW","created_at":"2026-07-05T11:26:07Z"},{"alias_kind":"pith_short_16","alias_value":"W5E7KB4AFVJW5SVV","created_at":"2026-07-05T11:26:07Z"},{"alias_kind":"pith_short_8","alias_value":"W5E7KB4A","created_at":"2026-07-05T11:26:07Z"}],"graph_snapshots":[{"event_id":"sha256:968185978681e3793a72da797339d9bd242ec535c18572dba46bf67ed4c18ac8","target":"graph","created_at":"2026-07-05T11:26:07Z","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/2506.18972/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"Active, low-mass stars are widely observed to have radii that are larger than predicted by standard stellar models. Proposed mechanisms for this radius inflation generally involve stellar magnetism, either in the form of added pressure support in the outer layers and/or suppression of convection via starspots. We have assembled a large sample of 261 low-mass stars in the young clusters Upper Scorpius, $\\alpha$ Persei, Pleiades, and Praesepe (spanning ages 10--670 Myr) for which the data exist to empirically measure the stellar radii, rotation periods, and starspot covering fractions. We find a","authors_text":"Keivan G. Stassun, Lyra Cao","cross_cats":[],"headline":"","license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"astro-ph.SR","submitted_at":"2025-06-23T18:00:01Z","title":"The Relationship of Stellar Radius Inflation to Rotation and Magnetic Starspots at 10--670 Myr"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2506.18972","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":"sha256:07e5647ac23c428ab7b37f10451e66037a8fa9c85757796c3ab2956994597162","target":"record","created_at":"2026-07-05T11:26:07Z","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":"c2ca7862ae8047b0a153988b08f732edaedd4ed47247d8c0ab71a399e2f4279c","cross_cats_sorted":[],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"astro-ph.SR","submitted_at":"2025-06-23T18:00:01Z","title_canon_sha256":"af6623ad68ae1eb4c8be1458e25d711d7ec8a04e1011d47972fb9deb2fa6d699"},"schema_version":"1.0","source":{"id":"2506.18972","kind":"arxiv","version":1}},"canonical_sha256":"b749f507802d536ecab54a56d9bd9281079a33ae03409867c827c69fb343c9a7","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"b749f507802d536ecab54a56d9bd9281079a33ae03409867c827c69fb343c9a7","first_computed_at":"2026-07-05T11:26:07.398782Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T11:26:07.398782Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"UUMGR/2KCpgf/aPlFOD+1Aut2KaTqlc4UtkGtIEluF+y4dXqTx/dqlDTdfsxTLfLa9nhG3cWWlt6A5LwJ9jwAA==","signature_status":"signed_v1","signed_at":"2026-07-05T11:26:07.399249Z","signed_message":"canonical_sha256_bytes"},"source_id":"2506.18972","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:07e5647ac23c428ab7b37f10451e66037a8fa9c85757796c3ab2956994597162","sha256:968185978681e3793a72da797339d9bd242ec535c18572dba46bf67ed4c18ac8"],"state_sha256":"68d2554f0c00a146b213f0d0760aab2cb7f96d7eb3fc7f351692f69a3a74ef56"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"OZrKWL77bzzniZfuDQ3JLd6su8HNi8uOLSJ7fzAu4VI8dronz4tyhd9HHI+ErDx+5SDZHL+q69b+wIa4U2HqBw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-19T18:37:15.122002Z","bundle_sha256":"60c17cb7006d47ba9c93eca2bb1923c18353673cedd6e42e18b597cdda40c96a"}}