{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2021:BRUPGWH6D552NGTE2BGH3EMOS4","short_pith_number":"pith:BRUPGWH6","canonical_record":{"source":{"id":"2107.09611","kind":"arxiv","version":2},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"cond-mat.soft","submitted_at":"2021-07-20T16:43:45Z","cross_cats_sorted":[],"title_canon_sha256":"f1512793009a73625644e7ce7025a6742196700aa8fc9ac850e5848e42f85b78","abstract_canon_sha256":"5a61948adf21e698a083e6f0f2fe963658a3744c9087035480fa4e43f0f538c0"},"schema_version":"1.0"},"canonical_sha256":"0c68f358fe1f7ba69a64d04c7d918e9714ca2ee09da31e3836d309bd01c7a06e","source":{"kind":"arxiv","id":"2107.09611","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2107.09611","created_at":"2026-07-05T03:42:22Z"},{"alias_kind":"arxiv_version","alias_value":"2107.09611v2","created_at":"2026-07-05T03:42:22Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2107.09611","created_at":"2026-07-05T03:42:22Z"},{"alias_kind":"pith_short_12","alias_value":"BRUPGWH6D552","created_at":"2026-07-05T03:42:22Z"},{"alias_kind":"pith_short_16","alias_value":"BRUPGWH6D552NGTE","created_at":"2026-07-05T03:42:22Z"},{"alias_kind":"pith_short_8","alias_value":"BRUPGWH6","created_at":"2026-07-05T03:42:22Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2021:BRUPGWH6D552NGTE2BGH3EMOS4","target":"record","payload":{"canonical_record":{"source":{"id":"2107.09611","kind":"arxiv","version":2},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"cond-mat.soft","submitted_at":"2021-07-20T16:43:45Z","cross_cats_sorted":[],"title_canon_sha256":"f1512793009a73625644e7ce7025a6742196700aa8fc9ac850e5848e42f85b78","abstract_canon_sha256":"5a61948adf21e698a083e6f0f2fe963658a3744c9087035480fa4e43f0f538c0"},"schema_version":"1.0"},"canonical_sha256":"0c68f358fe1f7ba69a64d04c7d918e9714ca2ee09da31e3836d309bd01c7a06e","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T03:42:22.615324Z","signature_b64":"KVaj9a9CEsyhYWQjNyPrsgc1R4rrlXJh0dZOyBqRuBO6T5OOQdQI6Q3y8t8oZ7dCbRFQ1Xl8PpzLpgjPea0iDA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"0c68f358fe1f7ba69a64d04c7d918e9714ca2ee09da31e3836d309bd01c7a06e","last_reissued_at":"2026-07-05T03:42:22.614790Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T03:42:22.614790Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2107.09611","source_version":2,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-07-05T03:42:22Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"JAhn1rbNcECYV6CMORXA3TbVN+YCUpGwOCE9ajk7UJ+1D+rckzGVKg++nVKn0PJMA/nulPmdI9bXcZdoSgdpAQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-31T16:05:25.337095Z"},"content_sha256":"7d1550521164d18ada35f6b9d52a03e03683ec2042e631071745a823e46efc23","schema_version":"1.0","event_id":"sha256:7d1550521164d18ada35f6b9d52a03e03683ec2042e631071745a823e46efc23"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2021:BRUPGWH6D552NGTE2BGH3EMOS4","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Metric mechanics with non-trivial topology: actuating irises, cylinders and evertors","license":"http://creativecommons.org/licenses/by/4.0/","headline":"","cross_cats":[],"primary_cat":"cond-mat.soft","authors_text":"D. Duffy, J. S. Biggins, M. Javed, M. K. Abdelrahman, M. Warner, T. H. Ware","submitted_at":"2021-07-20T16:43:45Z","abstract_excerpt":"Liquid crystal elastomers contract along their director on heating and recover on cooling, offering great potential as actuators and artificial muscles. If a flat sheet is programmed with a spatially varying director pattern, it will actuate into a curved surface, allowing the material to act as a strong machine such as a grabber or lifter. Here we study the actuation of programmed annular sheets which, owing to their central hole, can sidestep constraints on area and orientation. We systematically catalogue the set of developable surfaces encodable via axisymmetric director patterns, and unco"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2107.09611","kind":"arxiv","version":2},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/2107.09611/integrity.json","findings":[],"available":true,"detectors_run":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938"},"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":"2026-07-05T03:42:22Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"WjgcXDikjURe9fD6of9Rt/rN4RqAOXrr3oGr/wgg+XovL/EVEgc6zVnDaXpWlmyKfApeyjzbe5JJlwE9zkMjCg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-31T16:05:25.337954Z"},"content_sha256":"fb2b773e783bbca7e1008f05a17ca837e867a45357173beefa4d02daa0fd2421","schema_version":"1.0","event_id":"sha256:fb2b773e783bbca7e1008f05a17ca837e867a45357173beefa4d02daa0fd2421"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/BRUPGWH6D552NGTE2BGH3EMOS4/bundle.json","state_url":"https://pith.science/pith/BRUPGWH6D552NGTE2BGH3EMOS4/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/BRUPGWH6D552NGTE2BGH3EMOS4/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":"2026-07-31T16:05:25Z","links":{"resolver":"https://pith.science/pith/BRUPGWH6D552NGTE2BGH3EMOS4","bundle":"https://pith.science/pith/BRUPGWH6D552NGTE2BGH3EMOS4/bundle.json","state":"https://pith.science/pith/BRUPGWH6D552NGTE2BGH3EMOS4/state.json","well_known_bundle":"https://pith.science/.well-known/pith/BRUPGWH6D552NGTE2BGH3EMOS4/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2021:BRUPGWH6D552NGTE2BGH3EMOS4","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":"5a61948adf21e698a083e6f0f2fe963658a3744c9087035480fa4e43f0f538c0","cross_cats_sorted":[],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"cond-mat.soft","submitted_at":"2021-07-20T16:43:45Z","title_canon_sha256":"f1512793009a73625644e7ce7025a6742196700aa8fc9ac850e5848e42f85b78"},"schema_version":"1.0","source":{"id":"2107.09611","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2107.09611","created_at":"2026-07-05T03:42:22Z"},{"alias_kind":"arxiv_version","alias_value":"2107.09611v2","created_at":"2026-07-05T03:42:22Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2107.09611","created_at":"2026-07-05T03:42:22Z"},{"alias_kind":"pith_short_12","alias_value":"BRUPGWH6D552","created_at":"2026-07-05T03:42:22Z"},{"alias_kind":"pith_short_16","alias_value":"BRUPGWH6D552NGTE","created_at":"2026-07-05T03:42:22Z"},{"alias_kind":"pith_short_8","alias_value":"BRUPGWH6","created_at":"2026-07-05T03:42:22Z"}],"graph_snapshots":[{"event_id":"sha256:fb2b773e783bbca7e1008f05a17ca837e867a45357173beefa4d02daa0fd2421","target":"graph","created_at":"2026-07-05T03:42:22Z","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/2107.09611/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"Liquid crystal elastomers contract along their director on heating and recover on cooling, offering great potential as actuators and artificial muscles. If a flat sheet is programmed with a spatially varying director pattern, it will actuate into a curved surface, allowing the material to act as a strong machine such as a grabber or lifter. Here we study the actuation of programmed annular sheets which, owing to their central hole, can sidestep constraints on area and orientation. We systematically catalogue the set of developable surfaces encodable via axisymmetric director patterns, and unco","authors_text":"D. Duffy, J. S. Biggins, M. Javed, M. K. Abdelrahman, M. Warner, T. H. Ware","cross_cats":[],"headline":"","license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"cond-mat.soft","submitted_at":"2021-07-20T16:43:45Z","title":"Metric mechanics with non-trivial topology: actuating irises, cylinders and evertors"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2107.09611","kind":"arxiv","version":2},"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":"sha256:7d1550521164d18ada35f6b9d52a03e03683ec2042e631071745a823e46efc23","target":"record","created_at":"2026-07-05T03:42:22Z","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":"5a61948adf21e698a083e6f0f2fe963658a3744c9087035480fa4e43f0f538c0","cross_cats_sorted":[],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"cond-mat.soft","submitted_at":"2021-07-20T16:43:45Z","title_canon_sha256":"f1512793009a73625644e7ce7025a6742196700aa8fc9ac850e5848e42f85b78"},"schema_version":"1.0","source":{"id":"2107.09611","kind":"arxiv","version":2}},"canonical_sha256":"0c68f358fe1f7ba69a64d04c7d918e9714ca2ee09da31e3836d309bd01c7a06e","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"0c68f358fe1f7ba69a64d04c7d918e9714ca2ee09da31e3836d309bd01c7a06e","first_computed_at":"2026-07-05T03:42:22.614790Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T03:42:22.614790Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"KVaj9a9CEsyhYWQjNyPrsgc1R4rrlXJh0dZOyBqRuBO6T5OOQdQI6Q3y8t8oZ7dCbRFQ1Xl8PpzLpgjPea0iDA==","signature_status":"signed_v1","signed_at":"2026-07-05T03:42:22.615324Z","signed_message":"canonical_sha256_bytes"},"source_id":"2107.09611","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:7d1550521164d18ada35f6b9d52a03e03683ec2042e631071745a823e46efc23","sha256:fb2b773e783bbca7e1008f05a17ca837e867a45357173beefa4d02daa0fd2421"],"state_sha256":"f1fe34483d710d74dd8d16953b14fe85173ea6c67188ee76465ed1185677826f"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"/go3tjHOnyI+z25pd5Bb0g4qdZtzt5DWMQFDp/mDe4kFFvMKaHYhR6oJHOLETV9zeTJptbw6bu8nmmnyvKd3CQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-07-31T16:05:25.344167Z","bundle_sha256":"ea850dbb2f59c9f69d463a4fdf8b2812cb5de8661daf4a99efadb83fbf7f7cdc"}}