{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2019:BSFX5MJTIQH7Z7A4554PXQQXLE","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":"ff60b83d3485a5758ab0bb89da8f04a7db9d5eb8307a6ae4b24d0806d5481789","cross_cats_sorted":["astro-ph.IM"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.pop-ph","submitted_at":"2019-01-28T08:09:25Z","title_canon_sha256":"9293427ffa98fd243ef07277f5e30140d7eeec4d75d97d49bc0454eb1288b7ee"},"schema_version":"1.0","source":{"id":"1901.09542","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1901.09542","created_at":"2026-05-17T23:55:24Z"},{"alias_kind":"arxiv_version","alias_value":"1901.09542v1","created_at":"2026-05-17T23:55:24Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1901.09542","created_at":"2026-05-17T23:55:24Z"},{"alias_kind":"pith_short_12","alias_value":"BSFX5MJTIQH7","created_at":"2026-05-18T12:33:12Z"},{"alias_kind":"pith_short_16","alias_value":"BSFX5MJTIQH7Z7A4","created_at":"2026-05-18T12:33:12Z"},{"alias_kind":"pith_short_8","alias_value":"BSFX5MJT","created_at":"2026-05-18T12:33:12Z"}],"graph_snapshots":[{"event_id":"sha256:6d0b4e529e1f33d0e21ba50f680bd34e78907438d11b9fca7de79cc0404a6b98","target":"graph","created_at":"2026-05-17T23:55:24Z","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":"In the first papers of our series on interstellar generation ships we have demonstrated that the numerical code HERITAGE is able to calculate the success rate of multi-generational space missions. Thanks to the social and breeding constraints we examined, a multi-generational crew can safely reach an exoplanet after centuries of deep space travel without risks of consanguinity or genetic disorders. We now turn to addressing an equally important question : how to feed the crew? Dried food stocks are not a viable option due to the deterioration of vitamins with time and the tremendous quantities","authors_text":"C. Beluffi, F. Marin, L. Grau, R. Taylor","cross_cats":["astro-ph.IM"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.pop-ph","submitted_at":"2019-01-28T08:09:25Z","title":"Numerical constraints on the size of generation ships from total energy expenditure on board, annual food production and space farming techniques"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1901.09542","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":"sha256:2dc4772230ab3366b21d63fd893aa5fb42aa8a466088195a922d452e564cff8e","target":"record","created_at":"2026-05-17T23:55:24Z","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":"ff60b83d3485a5758ab0bb89da8f04a7db9d5eb8307a6ae4b24d0806d5481789","cross_cats_sorted":["astro-ph.IM"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.pop-ph","submitted_at":"2019-01-28T08:09:25Z","title_canon_sha256":"9293427ffa98fd243ef07277f5e30140d7eeec4d75d97d49bc0454eb1288b7ee"},"schema_version":"1.0","source":{"id":"1901.09542","kind":"arxiv","version":1}},"canonical_sha256":"0c8b7eb133440ffcfc1cef78fbc21759039a0522fcaa6c6a7cf7fba521e454c0","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"0c8b7eb133440ffcfc1cef78fbc21759039a0522fcaa6c6a7cf7fba521e454c0","first_computed_at":"2026-05-17T23:55:24.541494Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-17T23:55:24.541494Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"TNgtKZ/QgiXjQysylAwIHW3D5AAB47eRza1WJKXbuiPf+JA8KvF/RXHuAR9yK7PhX85cbUzJcTAnraVmyK46CQ==","signature_status":"signed_v1","signed_at":"2026-05-17T23:55:24.542046Z","signed_message":"canonical_sha256_bytes"},"source_id":"1901.09542","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:2dc4772230ab3366b21d63fd893aa5fb42aa8a466088195a922d452e564cff8e","sha256:6d0b4e529e1f33d0e21ba50f680bd34e78907438d11b9fca7de79cc0404a6b98"],"state_sha256":"6b53467e2389583dd8087844d678f60f0b2dd864780c95ffd7552ddd1f1ea9dc"}