{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2016:YF4UGMJJFTLC65ZXTUBICOBDWP","short_pith_number":"pith:YF4UGMJJ","canonical_record":{"source":{"id":"1605.00428","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.flu-dyn","submitted_at":"2016-05-02T10:50:26Z","cross_cats_sorted":[],"title_canon_sha256":"ef7c500dc8f1c653b368763ca1589c21c20ad86c6a4f14612e4c2e5f92fb6386","abstract_canon_sha256":"48cc84d6e161822b0ed51f8163314a2954f621be68d295c1805866520ec1f6d6"},"schema_version":"1.0"},"canonical_sha256":"c1794331292cd62f77379d02813823b3f1038340098cdb8341673ea2ddd03651","source":{"kind":"arxiv","id":"1605.00428","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1605.00428","created_at":"2026-05-18T01:15:55Z"},{"alias_kind":"arxiv_version","alias_value":"1605.00428v1","created_at":"2026-05-18T01:15:55Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1605.00428","created_at":"2026-05-18T01:15:55Z"},{"alias_kind":"pith_short_12","alias_value":"YF4UGMJJFTLC","created_at":"2026-05-18T12:30:53Z"},{"alias_kind":"pith_short_16","alias_value":"YF4UGMJJFTLC65ZX","created_at":"2026-05-18T12:30:53Z"},{"alias_kind":"pith_short_8","alias_value":"YF4UGMJJ","created_at":"2026-05-18T12:30:53Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2016:YF4UGMJJFTLC65ZXTUBICOBDWP","target":"record","payload":{"canonical_record":{"source":{"id":"1605.00428","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.flu-dyn","submitted_at":"2016-05-02T10:50:26Z","cross_cats_sorted":[],"title_canon_sha256":"ef7c500dc8f1c653b368763ca1589c21c20ad86c6a4f14612e4c2e5f92fb6386","abstract_canon_sha256":"48cc84d6e161822b0ed51f8163314a2954f621be68d295c1805866520ec1f6d6"},"schema_version":"1.0"},"canonical_sha256":"c1794331292cd62f77379d02813823b3f1038340098cdb8341673ea2ddd03651","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:15:55.838427Z","signature_b64":"O8KUrrS9GjguHXWpR+fcKQSqkujcJbpH9WYkh6TJDhzTeP96dwvPRZnrl5EdcQQjGcNttODMvDRmq27yHmLrDg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"c1794331292cd62f77379d02813823b3f1038340098cdb8341673ea2ddd03651","last_reissued_at":"2026-05-18T01:15:55.837874Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:15:55.837874Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1605.00428","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":"2026-05-18T01:15:55Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"0Cx4qoJ5t3BlMKZbWC9uu+6DZPR9p/UFPTpJKgm9jhTYJlPFYLgOFvCTRTcEh6qEoUyOO9gVMq1UHDaCH0XpAg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-28T13:56:36.963949Z"},"content_sha256":"55128c01fd8ff76f7e20b13acf148fb4ed760d4b2b55b0ba7c5c3404017e86e7","schema_version":"1.0","event_id":"sha256:55128c01fd8ff76f7e20b13acf148fb4ed760d4b2b55b0ba7c5c3404017e86e7"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2016:YF4UGMJJFTLC65ZXTUBICOBDWP","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Parameter based design of a twin-cylinder wave energy converter for real sea-states","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"physics.flu-dyn","authors_text":"Dali Xu, Michael Stiassnie, Raphael Stuhlmeier","submitted_at":"2016-05-02T10:50:26Z","abstract_excerpt":"We discuss the hydrodynamics of a wave energy converter consisting of two vertically floating, coaxial cylinders connected by dampers and allowed to heave, sway and roll. This design, viable in deep water and able to extract energy independent of the incident wave direction, is examined for monochromatic waves as well as broad-banded seas described by a Pierson Moskowitz spectrum. Several possible device sizes are considered, and their performance is investigated for a design spectrum, as well as for more severe sea states, with a view towards survivability of the converters. In terms of devic"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1605.00428","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":""},"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":"2026-05-18T01:15:55Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"1oje6naCTIlj4izpKsz+xF0f4GzSZtTqU90R9xJ2iUuR95w5j4OUMlN3QX8RZG/IGzpv7oFGprigvmjEy/1YDg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-28T13:56:36.964600Z"},"content_sha256":"a4918c1f38408814f1492c1631252f9e6b9889ffa45e940593c83a4a5f036717","schema_version":"1.0","event_id":"sha256:a4918c1f38408814f1492c1631252f9e6b9889ffa45e940593c83a4a5f036717"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/YF4UGMJJFTLC65ZXTUBICOBDWP/bundle.json","state_url":"https://pith.science/pith/YF4UGMJJFTLC65ZXTUBICOBDWP/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/YF4UGMJJFTLC65ZXTUBICOBDWP/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":"2026-05-28T13:56:36Z","links":{"resolver":"https://pith.science/pith/YF4UGMJJFTLC65ZXTUBICOBDWP","bundle":"https://pith.science/pith/YF4UGMJJFTLC65ZXTUBICOBDWP/bundle.json","state":"https://pith.science/pith/YF4UGMJJFTLC65ZXTUBICOBDWP/state.json","well_known_bundle":"https://pith.science/.well-known/pith/YF4UGMJJFTLC65ZXTUBICOBDWP/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2016:YF4UGMJJFTLC65ZXTUBICOBDWP","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":"48cc84d6e161822b0ed51f8163314a2954f621be68d295c1805866520ec1f6d6","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.flu-dyn","submitted_at":"2016-05-02T10:50:26Z","title_canon_sha256":"ef7c500dc8f1c653b368763ca1589c21c20ad86c6a4f14612e4c2e5f92fb6386"},"schema_version":"1.0","source":{"id":"1605.00428","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1605.00428","created_at":"2026-05-18T01:15:55Z"},{"alias_kind":"arxiv_version","alias_value":"1605.00428v1","created_at":"2026-05-18T01:15:55Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1605.00428","created_at":"2026-05-18T01:15:55Z"},{"alias_kind":"pith_short_12","alias_value":"YF4UGMJJFTLC","created_at":"2026-05-18T12:30:53Z"},{"alias_kind":"pith_short_16","alias_value":"YF4UGMJJFTLC65ZX","created_at":"2026-05-18T12:30:53Z"},{"alias_kind":"pith_short_8","alias_value":"YF4UGMJJ","created_at":"2026-05-18T12:30:53Z"}],"graph_snapshots":[{"event_id":"sha256:a4918c1f38408814f1492c1631252f9e6b9889ffa45e940593c83a4a5f036717","target":"graph","created_at":"2026-05-18T01:15:55Z","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 discuss the hydrodynamics of a wave energy converter consisting of two vertically floating, coaxial cylinders connected by dampers and allowed to heave, sway and roll. This design, viable in deep water and able to extract energy independent of the incident wave direction, is examined for monochromatic waves as well as broad-banded seas described by a Pierson Moskowitz spectrum. Several possible device sizes are considered, and their performance is investigated for a design spectrum, as well as for more severe sea states, with a view towards survivability of the converters. In terms of devic","authors_text":"Dali Xu, Michael Stiassnie, Raphael Stuhlmeier","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.flu-dyn","submitted_at":"2016-05-02T10:50:26Z","title":"Parameter based design of a twin-cylinder wave energy converter for real sea-states"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1605.00428","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":"sha256:55128c01fd8ff76f7e20b13acf148fb4ed760d4b2b55b0ba7c5c3404017e86e7","target":"record","created_at":"2026-05-18T01:15:55Z","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":"48cc84d6e161822b0ed51f8163314a2954f621be68d295c1805866520ec1f6d6","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.flu-dyn","submitted_at":"2016-05-02T10:50:26Z","title_canon_sha256":"ef7c500dc8f1c653b368763ca1589c21c20ad86c6a4f14612e4c2e5f92fb6386"},"schema_version":"1.0","source":{"id":"1605.00428","kind":"arxiv","version":1}},"canonical_sha256":"c1794331292cd62f77379d02813823b3f1038340098cdb8341673ea2ddd03651","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"c1794331292cd62f77379d02813823b3f1038340098cdb8341673ea2ddd03651","first_computed_at":"2026-05-18T01:15:55.837874Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:15:55.837874Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"O8KUrrS9GjguHXWpR+fcKQSqkujcJbpH9WYkh6TJDhzTeP96dwvPRZnrl5EdcQQjGcNttODMvDRmq27yHmLrDg==","signature_status":"signed_v1","signed_at":"2026-05-18T01:15:55.838427Z","signed_message":"canonical_sha256_bytes"},"source_id":"1605.00428","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:55128c01fd8ff76f7e20b13acf148fb4ed760d4b2b55b0ba7c5c3404017e86e7","sha256:a4918c1f38408814f1492c1631252f9e6b9889ffa45e940593c83a4a5f036717"],"state_sha256":"10184adb929e22f6ecda0145efa7fabe0f258f54914aaee7304caf81512adee9"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"3jyrH4hUg0pL7fPrNfkgJNjfYz7Y5Pc5L3IXg+HiKDwkVZi85W+jX9ytjtNLqxSXvVafKgeu5bfURtFPgFPXDg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-28T13:56:36.967748Z","bundle_sha256":"dbf4923e182a27f12154f4716863a9a853e9f5548a635a2f58a6ed036fe0988e"}}