{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2019:MXKWN3FOTU3IJPTTNDTZFMYWUN","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":"3713336b65e6f07bbf9d0844e2c55c99fe2b547b765a921cda3cc4f764155a49","cross_cats_sorted":["physics.space-ph"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2019-08-25T14:36:37Z","title_canon_sha256":"a1bb0789e4b5dd96677f926ac97917eef5eae5582d7bc3ee423aca4a00ea6d99"},"schema_version":"1.0","source":{"id":"1908.09339","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1908.09339","created_at":"2026-07-04T23:59:39Z"},{"alias_kind":"arxiv_version","alias_value":"1908.09339v1","created_at":"2026-07-04T23:59:39Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1908.09339","created_at":"2026-07-04T23:59:39Z"},{"alias_kind":"pith_short_12","alias_value":"MXKWN3FOTU3I","created_at":"2026-07-04T23:59:39Z"},{"alias_kind":"pith_short_16","alias_value":"MXKWN3FOTU3IJPTT","created_at":"2026-07-04T23:59:39Z"},{"alias_kind":"pith_short_8","alias_value":"MXKWN3FO","created_at":"2026-07-04T23:59:39Z"}],"graph_snapshots":[{"event_id":"sha256:8418634b6853a1915eef569efe67a33a6fde798135ddcc9199689ee407d02f31","target":"graph","created_at":"2026-07-04T23:59:39Z","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/1908.09339/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"Perhaps the biggest hurdle to mankind's expansion throughout the Solar System is the prohibitive cost of escaping Earth's gravitational pull. In its many forms, the space-elevator provides a way to circumvent this cost, allowing payloads to traverse along a cable extending from Earth to orbit. However, modern materials are not strong enough to build a cable capable of supporting its own weight. In this work we present an alternative to the classic space elevator, within reach of modern technology: The Spaceline. By extending a line, anchored on the moon, to deep within Earth's gravity well, we","authors_text":"Emily Sandford, Zephyr Penoyre","cross_cats":["physics.space-ph"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2019-08-25T14:36:37Z","title":"The Spaceline: a practical space elevator alternative achievable with current technology"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1908.09339","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":"sha256:6286668a86b38f6b1ed1312fd1195fd1b0d82b8055bf2109863efded67a9d47a","target":"record","created_at":"2026-07-04T23:59:39Z","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":"3713336b65e6f07bbf9d0844e2c55c99fe2b547b765a921cda3cc4f764155a49","cross_cats_sorted":["physics.space-ph"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2019-08-25T14:36:37Z","title_canon_sha256":"a1bb0789e4b5dd96677f926ac97917eef5eae5582d7bc3ee423aca4a00ea6d99"},"schema_version":"1.0","source":{"id":"1908.09339","kind":"arxiv","version":1}},"canonical_sha256":"65d566ecae9d3684be7368e792b316a373e45816a128673fea2cda0ac222970e","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"65d566ecae9d3684be7368e792b316a373e45816a128673fea2cda0ac222970e","first_computed_at":"2026-07-04T23:59:39.246977Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-04T23:59:39.246977Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"hmM+o2wo1jn/HxnpsOq7TAX5NfKleBiIGczDYO0Hq6RjcKT3rj8Z4qFTv/J5FZ/aor4I/NIkSAUtzunVThsYCQ==","signature_status":"signed_v1","signed_at":"2026-07-04T23:59:39.247355Z","signed_message":"canonical_sha256_bytes"},"source_id":"1908.09339","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:6286668a86b38f6b1ed1312fd1195fd1b0d82b8055bf2109863efded67a9d47a","sha256:8418634b6853a1915eef569efe67a33a6fde798135ddcc9199689ee407d02f31"],"state_sha256":"662e20a201ed37454e0fb941a87f68b5b3680fbc4d6041d01463ca19a1f6e617"}