{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2019:3752CZQQNE4V6KJDXNR4G3T3E2","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":"4928eebb55b3c94a785b37c6e6622fb76f70a74ee3e4732ea9e73cab73ae420a","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.EP","submitted_at":"2019-05-10T18:00:00Z","title_canon_sha256":"8d4688a6920570f3c07fdab21fd02aa2dc12679004d2f39082a760ff0318b131"},"schema_version":"1.0","source":{"id":"1905.04309","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1905.04309","created_at":"2026-05-17T23:46:25Z"},{"alias_kind":"arxiv_version","alias_value":"1905.04309v1","created_at":"2026-05-17T23:46:25Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1905.04309","created_at":"2026-05-17T23:46:25Z"},{"alias_kind":"pith_short_12","alias_value":"3752CZQQNE4V","created_at":"2026-05-18T12:33:07Z"},{"alias_kind":"pith_short_16","alias_value":"3752CZQQNE4V6KJD","created_at":"2026-05-18T12:33:07Z"},{"alias_kind":"pith_short_8","alias_value":"3752CZQQ","created_at":"2026-05-18T12:33:07Z"}],"graph_snapshots":[{"event_id":"sha256:8f18e22b412765da992d58f7ff33b3b36bab3b19b995707c9b1f48d9a3583931","target":"graph","created_at":"2026-05-17T23:46:25Z","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"},"paper":{"abstract_excerpt":"Discovering other worlds the size of our own has been a long-held dream of astronomers. The transiting planets Kepler-20e and Kepler-20f, which belong to a multi-planet system, hold a very special place among the many groundbreaking discoveries of the Kepler mission because they finally realized that dream. The radius of Kepler-20f is essentially identical to that of the Earth, while Kepler-20e is even smaller (0.87 R[Earth]), and was the first exoplanet to earn that distinction. Their masses, however, are too light to measure with current instrumentation, and this has prevented their confirma","authors_text":"2) ( (1) Center for Astrophysics | Harvard, (2) CVS Health, Francois Fressin (1, Guillermo Torres (1), Smithsonian, USA, USA)","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.EP","submitted_at":"2019-05-10T18:00:00Z","title":"Discovery of the first Earth-sized planets orbiting a star other than our Sun in the Kepler-20 system"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1905.04309","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":"sha256:6445451007902ff0d02bd32dd667b77ef1711bf0a163c0289c32c5cf9ad15d95","target":"record","created_at":"2026-05-17T23:46:25Z","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":"4928eebb55b3c94a785b37c6e6622fb76f70a74ee3e4732ea9e73cab73ae420a","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.EP","submitted_at":"2019-05-10T18:00:00Z","title_canon_sha256":"8d4688a6920570f3c07fdab21fd02aa2dc12679004d2f39082a760ff0318b131"},"schema_version":"1.0","source":{"id":"1905.04309","kind":"arxiv","version":1}},"canonical_sha256":"dffba1661069395f2923bb63c36e7b269ca0928610b2e8b24a581ae6492ae3ff","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"dffba1661069395f2923bb63c36e7b269ca0928610b2e8b24a581ae6492ae3ff","first_computed_at":"2026-05-17T23:46:25.350904Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-17T23:46:25.350904Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"B1o66B2wqhzZnZYXpe9Ar2NGXBLdgfcU3vFBYo97GU8uJzl4WxohTfY9LFQbkF8YnKCkbeZKAxrArtp/YWwaCg==","signature_status":"signed_v1","signed_at":"2026-05-17T23:46:25.351531Z","signed_message":"canonical_sha256_bytes"},"source_id":"1905.04309","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:6445451007902ff0d02bd32dd667b77ef1711bf0a163c0289c32c5cf9ad15d95","sha256:8f18e22b412765da992d58f7ff33b3b36bab3b19b995707c9b1f48d9a3583931"],"state_sha256":"604e27c5642910882bc2c58e36546c6161e5d6bf0fbbf7fd1344b1e4756382a5"}