{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2025:O5HN5F2FN75JMY767WKJOOKXRE","short_pith_number":"pith:O5HN5F2F","canonical_record":{"source":{"id":"2507.15953","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"astro-ph.SR","submitted_at":"2025-07-21T18:00:10Z","cross_cats_sorted":["astro-ph.EP"],"title_canon_sha256":"968cbe5b5aa0945dc8b660c4278bf71b072d8397ce3cb65afaab4541c2532b22","abstract_canon_sha256":"6dd0fe5738c7747c3067c60ab6e013f5678e7f1f64ef95b43ac248039d129538"},"schema_version":"1.0"},"canonical_sha256":"774ede97456ffa9663fefd94973957891af1a573aef3e11831543dcd787d145c","source":{"kind":"arxiv","id":"2507.15953","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2507.15953","created_at":"2026-07-05T11:40:59Z"},{"alias_kind":"arxiv_version","alias_value":"2507.15953v1","created_at":"2026-07-05T11:40:59Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2507.15953","created_at":"2026-07-05T11:40:59Z"},{"alias_kind":"pith_short_12","alias_value":"O5HN5F2FN75J","created_at":"2026-07-05T11:40:59Z"},{"alias_kind":"pith_short_16","alias_value":"O5HN5F2FN75JMY76","created_at":"2026-07-05T11:40:59Z"},{"alias_kind":"pith_short_8","alias_value":"O5HN5F2F","created_at":"2026-07-05T11:40:59Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2025:O5HN5F2FN75JMY767WKJOOKXRE","target":"record","payload":{"canonical_record":{"source":{"id":"2507.15953","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"astro-ph.SR","submitted_at":"2025-07-21T18:00:10Z","cross_cats_sorted":["astro-ph.EP"],"title_canon_sha256":"968cbe5b5aa0945dc8b660c4278bf71b072d8397ce3cb65afaab4541c2532b22","abstract_canon_sha256":"6dd0fe5738c7747c3067c60ab6e013f5678e7f1f64ef95b43ac248039d129538"},"schema_version":"1.0"},"canonical_sha256":"774ede97456ffa9663fefd94973957891af1a573aef3e11831543dcd787d145c","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T11:40:59.884080Z","signature_b64":"T2Z1EiSyy6zvbll8AI1Az7N6HQeExsj2oZwZOh5lTE9Jz2xqgZ2V7yMltZX5HKAkjaNCXoGCRqJ873uc7ugEBg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"774ede97456ffa9663fefd94973957891af1a573aef3e11831543dcd787d145c","last_reissued_at":"2026-07-05T11:40:59.883585Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T11:40:59.883585Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2507.15953","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":"2026-07-05T11:40:59Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"WxnHBM7//s0hTmK++VikSVZ0QWtwBJMFp0MXY7Pvow+JEvJehL6ar4cAHah4SNLECjKalszYWgbtyMM2Yz+DBg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-05T14:50:49.589107Z"},"content_sha256":"9d0df26e91d7a9a275daa3ad5d2003ea2306eefee614ffec7f9e283fedffec0b","schema_version":"1.0","event_id":"sha256:9d0df26e91d7a9a275daa3ad5d2003ea2306eefee614ffec7f9e283fedffec0b"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2025:O5HN5F2FN75JMY767WKJOOKXRE","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"A Semi-Empirical Estimate of Solar EUV Evolution from 10 Myr to 10 Gyr","license":"http://creativecommons.org/licenses/by/4.0/","headline":"","cross_cats":["astro-ph.EP"],"primary_cat":"astro-ph.SR","authors_text":"Alexander Brown (University of Colorado), Allison Youngblood (NASA/GSFC), Cynthia Froning (SwRI), David Wilson (University of Colorado), Girish Duvvuri (Vanderbilt), J. Sebastian Pineda (University of Colorado), Kevin France (University of Colorado), Kosuke Namekata (NASA/GSFC, Kyoto University), P. Christian Schneider (Christian-Albrects University), Tristen Sextro (Penn State University), Vladimir Airapetian (NASA/GSFC), Yuta Notsu (University of Colorado)","submitted_at":"2025-07-21T18:00:10Z","abstract_excerpt":"The extreme-ultraviolet (EUV; 100 -- 911 \\AA) spectra of F, G, K, and M stars provide diagnostics of the stellar chromosphere through the corona, with line and continuum formation temperatures spanning roughly 10$^{4}$ - 10$^{7}$ K. The EUV stellar spectrum in turn drives atmospheric photochemistry and numerous escape processes on orbiting planets. We present a new study of the EUV history of solar-type stars, using new and archival {\\it Hubble Space Telescope} observations of solar analogs (T$_{\\odot}$ $\\pm$ 150 K for stars older than 100 Myr) and ``Young Suns\" (age $<$ 100 Myr) that will evo"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2507.15953","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/2507.15953/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":"2026-07-05T11:40:59Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"bkhzWljSjWc0jBBPdVK/BTmqO/9yNgvdmBOPbPYqVPpSbbSrHXCYQnExiMndmNJHXVdnUUMNN7IMAI9BdEEcCw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-05T14:50:49.589619Z"},"content_sha256":"29c0cf0d1fc514e0eb4f0ad21ff7f49a17b5797b0ba1b8acbfd185e3d1150485","schema_version":"1.0","event_id":"sha256:29c0cf0d1fc514e0eb4f0ad21ff7f49a17b5797b0ba1b8acbfd185e3d1150485"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/O5HN5F2FN75JMY767WKJOOKXRE/bundle.json","state_url":"https://pith.science/pith/O5HN5F2FN75JMY767WKJOOKXRE/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/O5HN5F2FN75JMY767WKJOOKXRE/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":"2026-08-05T14:50:49Z","links":{"resolver":"https://pith.science/pith/O5HN5F2FN75JMY767WKJOOKXRE","bundle":"https://pith.science/pith/O5HN5F2FN75JMY767WKJOOKXRE/bundle.json","state":"https://pith.science/pith/O5HN5F2FN75JMY767WKJOOKXRE/state.json","well_known_bundle":"https://pith.science/.well-known/pith/O5HN5F2FN75JMY767WKJOOKXRE/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2025:O5HN5F2FN75JMY767WKJOOKXRE","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":"6dd0fe5738c7747c3067c60ab6e013f5678e7f1f64ef95b43ac248039d129538","cross_cats_sorted":["astro-ph.EP"],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"astro-ph.SR","submitted_at":"2025-07-21T18:00:10Z","title_canon_sha256":"968cbe5b5aa0945dc8b660c4278bf71b072d8397ce3cb65afaab4541c2532b22"},"schema_version":"1.0","source":{"id":"2507.15953","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2507.15953","created_at":"2026-07-05T11:40:59Z"},{"alias_kind":"arxiv_version","alias_value":"2507.15953v1","created_at":"2026-07-05T11:40:59Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2507.15953","created_at":"2026-07-05T11:40:59Z"},{"alias_kind":"pith_short_12","alias_value":"O5HN5F2FN75J","created_at":"2026-07-05T11:40:59Z"},{"alias_kind":"pith_short_16","alias_value":"O5HN5F2FN75JMY76","created_at":"2026-07-05T11:40:59Z"},{"alias_kind":"pith_short_8","alias_value":"O5HN5F2F","created_at":"2026-07-05T11:40:59Z"}],"graph_snapshots":[{"event_id":"sha256:29c0cf0d1fc514e0eb4f0ad21ff7f49a17b5797b0ba1b8acbfd185e3d1150485","target":"graph","created_at":"2026-07-05T11:40:59Z","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/2507.15953/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"The extreme-ultraviolet (EUV; 100 -- 911 \\AA) spectra of F, G, K, and M stars provide diagnostics of the stellar chromosphere through the corona, with line and continuum formation temperatures spanning roughly 10$^{4}$ - 10$^{7}$ K. The EUV stellar spectrum in turn drives atmospheric photochemistry and numerous escape processes on orbiting planets. We present a new study of the EUV history of solar-type stars, using new and archival {\\it Hubble Space Telescope} observations of solar analogs (T$_{\\odot}$ $\\pm$ 150 K for stars older than 100 Myr) and ``Young Suns\" (age $<$ 100 Myr) that will evo","authors_text":"Alexander Brown (University of Colorado), Allison Youngblood (NASA/GSFC), Cynthia Froning (SwRI), David Wilson (University of Colorado), Girish Duvvuri (Vanderbilt), J. Sebastian Pineda (University of Colorado), Kevin France (University of Colorado), Kosuke Namekata (NASA/GSFC, Kyoto University), P. Christian Schneider (Christian-Albrects University), Tristen Sextro (Penn State University), Vladimir Airapetian (NASA/GSFC), Yuta Notsu (University of Colorado)","cross_cats":["astro-ph.EP"],"headline":"","license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"astro-ph.SR","submitted_at":"2025-07-21T18:00:10Z","title":"A Semi-Empirical Estimate of Solar EUV Evolution from 10 Myr to 10 Gyr"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2507.15953","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":"sha256:9d0df26e91d7a9a275daa3ad5d2003ea2306eefee614ffec7f9e283fedffec0b","target":"record","created_at":"2026-07-05T11:40:59Z","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":"6dd0fe5738c7747c3067c60ab6e013f5678e7f1f64ef95b43ac248039d129538","cross_cats_sorted":["astro-ph.EP"],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"astro-ph.SR","submitted_at":"2025-07-21T18:00:10Z","title_canon_sha256":"968cbe5b5aa0945dc8b660c4278bf71b072d8397ce3cb65afaab4541c2532b22"},"schema_version":"1.0","source":{"id":"2507.15953","kind":"arxiv","version":1}},"canonical_sha256":"774ede97456ffa9663fefd94973957891af1a573aef3e11831543dcd787d145c","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"774ede97456ffa9663fefd94973957891af1a573aef3e11831543dcd787d145c","first_computed_at":"2026-07-05T11:40:59.883585Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T11:40:59.883585Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"T2Z1EiSyy6zvbll8AI1Az7N6HQeExsj2oZwZOh5lTE9Jz2xqgZ2V7yMltZX5HKAkjaNCXoGCRqJ873uc7ugEBg==","signature_status":"signed_v1","signed_at":"2026-07-05T11:40:59.884080Z","signed_message":"canonical_sha256_bytes"},"source_id":"2507.15953","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:9d0df26e91d7a9a275daa3ad5d2003ea2306eefee614ffec7f9e283fedffec0b","sha256:29c0cf0d1fc514e0eb4f0ad21ff7f49a17b5797b0ba1b8acbfd185e3d1150485"],"state_sha256":"235b5a7c666c4b6c8d9ac181088c3ca7b4f6f4dafb33e5549c8e8efea1516a6f"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"8EDlUqNXCnW2zuz5n3btMNgVK8SMYuLilGZXtadZ1C+G/UF546c0p8pUzwRjAigqZs6RRO6PZ/KxijFv2TGRBw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-05T14:50:49.593691Z","bundle_sha256":"2fe21a6ef310d1ea610182788129cede808e17a120899f8612998d3f30b96852"}}