{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2012:VN4EVOT4GHS4FYVFP2LOO5AS7B","short_pith_number":"pith:VN4EVOT4","canonical_record":{"source":{"id":"1204.4107","kind":"arxiv","version":4},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.NE","submitted_at":"2012-04-18T15:22:26Z","cross_cats_sorted":["cs.CG"],"title_canon_sha256":"17a2426f4b7afa83cd34eb05dbe824c55c63a3b55aa78e30a54d4911616a7491","abstract_canon_sha256":"d0935b1347ace23eb56c7aad609e390f433ee1649f9806eb6fa8d1e6080732c2"},"schema_version":"1.0"},"canonical_sha256":"ab784aba7c31e5c2e2a57e96e77412f84a34412ba891745a4f97f3c18908aa9c","source":{"kind":"arxiv","id":"1204.4107","version":4},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1204.4107","created_at":"2026-05-18T01:20:50Z"},{"alias_kind":"arxiv_version","alias_value":"1204.4107v4","created_at":"2026-05-18T01:20:50Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1204.4107","created_at":"2026-05-18T01:20:50Z"},{"alias_kind":"pith_short_12","alias_value":"VN4EVOT4GHS4","created_at":"2026-05-18T12:27:25Z"},{"alias_kind":"pith_short_16","alias_value":"VN4EVOT4GHS4FYVF","created_at":"2026-05-18T12:27:25Z"},{"alias_kind":"pith_short_8","alias_value":"VN4EVOT4","created_at":"2026-05-18T12:27:25Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2012:VN4EVOT4GHS4FYVFP2LOO5AS7B","target":"record","payload":{"canonical_record":{"source":{"id":"1204.4107","kind":"arxiv","version":4},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.NE","submitted_at":"2012-04-18T15:22:26Z","cross_cats_sorted":["cs.CG"],"title_canon_sha256":"17a2426f4b7afa83cd34eb05dbe824c55c63a3b55aa78e30a54d4911616a7491","abstract_canon_sha256":"d0935b1347ace23eb56c7aad609e390f433ee1649f9806eb6fa8d1e6080732c2"},"schema_version":"1.0"},"canonical_sha256":"ab784aba7c31e5c2e2a57e96e77412f84a34412ba891745a4f97f3c18908aa9c","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:20:50.903427Z","signature_b64":"DPV+wvNxRQ5LsiuIEE2buCAt1skwBzZXz+XC4A9793Pt5VHhJYiovym7nVriemsfKm4oTRMHxouEintRKsJADg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"ab784aba7c31e5c2e2a57e96e77412f84a34412ba891745a4f97f3c18908aa9c","last_reissued_at":"2026-05-18T01:20:50.902980Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:20:50.902980Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1204.4107","source_version":4,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T01:20:50Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"4UFTErNm6HVQAYxxQzoWJzP2KGMDvYHk460ITJvwvxq9grS9KHxwZmMF5ycdFfE6yQxGTJ1PIHFTK1fmcSinDA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-02T02:26:31.806725Z"},"content_sha256":"5abcad9c9fdafc2263ae97f2b43d71e4220ec1bdfe54e3a62daf46c6361dad3c","schema_version":"1.0","event_id":"sha256:5abcad9c9fdafc2263ae97f2b43d71e4220ec1bdfe54e3a62daf46c6361dad3c"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2012:VN4EVOT4GHS4FYVFP2LOO5AS7B","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Towards the Evolution of Vertical-Axis Wind Turbines using Supershapes","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["cs.CG"],"primary_cat":"cs.NE","authors_text":"Larry Bull, Richard J. Preen","submitted_at":"2012-04-18T15:22:26Z","abstract_excerpt":"We have recently presented an initial study of evolutionary algorithms used to design vertical-axis wind turbines (VAWTs) wherein candidate prototypes are evaluated under approximated wind tunnel conditions after being physically instantiated by a 3D printer. That is, unlike other approaches such as computational fluid dynamics simulations, no mathematical formulations are used and no model assumptions are made. However, the representation used significantly restricted the range of morphologies explored. In this paper, we present initial explorations into the use of a simple generative encodin"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1204.4107","kind":"arxiv","version":4},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"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":"2026-05-18T01:20:50Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"gqBlGwmWGVFVvF1eOS6cMSBMXADRta+09rWDQTLObpdZurkCrYEswdrM+olYQbKzyIA0u76kJPnZM+L7EJqICg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-02T02:26:31.807071Z"},"content_sha256":"1834368096e394fbc23fbfb0972ecd2f2014a531f92265ac8c96344cdeceba13","schema_version":"1.0","event_id":"sha256:1834368096e394fbc23fbfb0972ecd2f2014a531f92265ac8c96344cdeceba13"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/VN4EVOT4GHS4FYVFP2LOO5AS7B/bundle.json","state_url":"https://pith.science/pith/VN4EVOT4GHS4FYVFP2LOO5AS7B/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/VN4EVOT4GHS4FYVFP2LOO5AS7B/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":"2026-06-02T02:26:31Z","links":{"resolver":"https://pith.science/pith/VN4EVOT4GHS4FYVFP2LOO5AS7B","bundle":"https://pith.science/pith/VN4EVOT4GHS4FYVFP2LOO5AS7B/bundle.json","state":"https://pith.science/pith/VN4EVOT4GHS4FYVFP2LOO5AS7B/state.json","well_known_bundle":"https://pith.science/.well-known/pith/VN4EVOT4GHS4FYVFP2LOO5AS7B/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2012:VN4EVOT4GHS4FYVFP2LOO5AS7B","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":"d0935b1347ace23eb56c7aad609e390f433ee1649f9806eb6fa8d1e6080732c2","cross_cats_sorted":["cs.CG"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.NE","submitted_at":"2012-04-18T15:22:26Z","title_canon_sha256":"17a2426f4b7afa83cd34eb05dbe824c55c63a3b55aa78e30a54d4911616a7491"},"schema_version":"1.0","source":{"id":"1204.4107","kind":"arxiv","version":4}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1204.4107","created_at":"2026-05-18T01:20:50Z"},{"alias_kind":"arxiv_version","alias_value":"1204.4107v4","created_at":"2026-05-18T01:20:50Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1204.4107","created_at":"2026-05-18T01:20:50Z"},{"alias_kind":"pith_short_12","alias_value":"VN4EVOT4GHS4","created_at":"2026-05-18T12:27:25Z"},{"alias_kind":"pith_short_16","alias_value":"VN4EVOT4GHS4FYVF","created_at":"2026-05-18T12:27:25Z"},{"alias_kind":"pith_short_8","alias_value":"VN4EVOT4","created_at":"2026-05-18T12:27:25Z"}],"graph_snapshots":[{"event_id":"sha256:1834368096e394fbc23fbfb0972ecd2f2014a531f92265ac8c96344cdeceba13","target":"graph","created_at":"2026-05-18T01:20:50Z","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":"We have recently presented an initial study of evolutionary algorithms used to design vertical-axis wind turbines (VAWTs) wherein candidate prototypes are evaluated under approximated wind tunnel conditions after being physically instantiated by a 3D printer. That is, unlike other approaches such as computational fluid dynamics simulations, no mathematical formulations are used and no model assumptions are made. However, the representation used significantly restricted the range of morphologies explored. In this paper, we present initial explorations into the use of a simple generative encodin","authors_text":"Larry Bull, Richard J. Preen","cross_cats":["cs.CG"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.NE","submitted_at":"2012-04-18T15:22:26Z","title":"Towards the Evolution of Vertical-Axis Wind Turbines using Supershapes"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1204.4107","kind":"arxiv","version":4},"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":"sha256:5abcad9c9fdafc2263ae97f2b43d71e4220ec1bdfe54e3a62daf46c6361dad3c","target":"record","created_at":"2026-05-18T01:20:50Z","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":"d0935b1347ace23eb56c7aad609e390f433ee1649f9806eb6fa8d1e6080732c2","cross_cats_sorted":["cs.CG"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.NE","submitted_at":"2012-04-18T15:22:26Z","title_canon_sha256":"17a2426f4b7afa83cd34eb05dbe824c55c63a3b55aa78e30a54d4911616a7491"},"schema_version":"1.0","source":{"id":"1204.4107","kind":"arxiv","version":4}},"canonical_sha256":"ab784aba7c31e5c2e2a57e96e77412f84a34412ba891745a4f97f3c18908aa9c","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"ab784aba7c31e5c2e2a57e96e77412f84a34412ba891745a4f97f3c18908aa9c","first_computed_at":"2026-05-18T01:20:50.902980Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:20:50.902980Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"DPV+wvNxRQ5LsiuIEE2buCAt1skwBzZXz+XC4A9793Pt5VHhJYiovym7nVriemsfKm4oTRMHxouEintRKsJADg==","signature_status":"signed_v1","signed_at":"2026-05-18T01:20:50.903427Z","signed_message":"canonical_sha256_bytes"},"source_id":"1204.4107","source_kind":"arxiv","source_version":4}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:5abcad9c9fdafc2263ae97f2b43d71e4220ec1bdfe54e3a62daf46c6361dad3c","sha256:1834368096e394fbc23fbfb0972ecd2f2014a531f92265ac8c96344cdeceba13"],"state_sha256":"44638bc9d29a035f38e6b7c72c40c1c1088e6b6cc4e0b4d75f815ef57bc92419"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"qJmzwmr4V5HYhthn2lS4B374gcG6+B7dEaRgFmc6jWGbmfb4k6+UXOEJIzR6Q3E5yE4wwKkF5LXFmi2unbnFAQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-02T02:26:31.809086Z","bundle_sha256":"203ee2b44b3bbb746e021fd8b5ea129c03996ab34bbb1bdf2ab41b075a74b180"}}