{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2013:YX4XVONCSSEBLCCY7I6HU5P7YI","short_pith_number":"pith:YX4XVONC","canonical_record":{"source":{"id":"1310.3719","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2013-10-11T09:30:44Z","cross_cats_sorted":[],"title_canon_sha256":"57d4a6f7ad4edbebbe81fbd87a14af4d2276f99bb8e5602cf63ffbcdfbaff87f","abstract_canon_sha256":"8d86740c2f9dd6866363b05b4d08b2f39f96a5b99702fbbeb43b436ed506ab96"},"schema_version":"1.0"},"canonical_sha256":"c5f97ab9a29488158858fa3c7a75ffc2194f336a0e23c60ff5d658ef397b71f7","source":{"kind":"arxiv","id":"1310.3719","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1310.3719","created_at":"2026-05-18T01:47:05Z"},{"alias_kind":"arxiv_version","alias_value":"1310.3719v1","created_at":"2026-05-18T01:47:05Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1310.3719","created_at":"2026-05-18T01:47:05Z"},{"alias_kind":"pith_short_12","alias_value":"YX4XVONCSSEB","created_at":"2026-05-18T12:28:09Z"},{"alias_kind":"pith_short_16","alias_value":"YX4XVONCSSEBLCCY","created_at":"2026-05-18T12:28:09Z"},{"alias_kind":"pith_short_8","alias_value":"YX4XVONC","created_at":"2026-05-18T12:28:09Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2013:YX4XVONCSSEBLCCY7I6HU5P7YI","target":"record","payload":{"canonical_record":{"source":{"id":"1310.3719","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2013-10-11T09:30:44Z","cross_cats_sorted":[],"title_canon_sha256":"57d4a6f7ad4edbebbe81fbd87a14af4d2276f99bb8e5602cf63ffbcdfbaff87f","abstract_canon_sha256":"8d86740c2f9dd6866363b05b4d08b2f39f96a5b99702fbbeb43b436ed506ab96"},"schema_version":"1.0"},"canonical_sha256":"c5f97ab9a29488158858fa3c7a75ffc2194f336a0e23c60ff5d658ef397b71f7","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:47:05.764290Z","signature_b64":"D/huH9vufNSZGRihVDCTUTu6wQCt81Xl4NKToEZyWpeJO79ErCHyM08Ak9vEHBM6qHSUjXDF5uc8UDPyyFlaAg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"c5f97ab9a29488158858fa3c7a75ffc2194f336a0e23c60ff5d658ef397b71f7","last_reissued_at":"2026-05-18T01:47:05.763757Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:47:05.763757Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1310.3719","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":"2026-05-18T01:47:05Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"LQ3c6ewnSr6DFWsw61jsnolNKm8P9BSgNbnn/Imh9RaTEynTZiVIL1wSkBTFaE1pye9A5R55re1/EbT/tKICDQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-07T22:48:45.657582Z"},"content_sha256":"559f831a8b4e7cd396c9dd2393a1fe600d1ce31385a61b73929b63d80e9a8ce3","schema_version":"1.0","event_id":"sha256:559f831a8b4e7cd396c9dd2393a1fe600d1ce31385a61b73929b63d80e9a8ce3"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2013:YX4XVONCSSEBLCCY7I6HU5P7YI","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"On three-dimensional dilational elastic metamaterials","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"cond-mat.mtrl-sci","authors_text":"Graeme W. Milton, Martin Wegener, Michael Thiel, Muamer Kadic, Robert Schittny, Tiemo B\\\"uckmann","submitted_at":"2013-10-11T09:30:44Z","abstract_excerpt":"Dilational materials are stable three-dimensional isotropic auxetics with an ultimate Poisson's ratio of -1. We design, evaluate, fabricate, and characterize crystalline metamaterials approaching this ideal. To reveal all modes, we calculate the phonon band structures. On this basis, using cubic symmetry, we can unambiguously retrieve all different non-zero elements of the rank-4 effective metamaterial elasticity tensor, from which all effective elastic metamaterial properties follow. While the elastic properties and the phase velocity remain anisotropic, the effective Poisson's ratio indeed b"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1310.3719","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":"2026-05-18T01:47:05Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"JbsMEGsE2ywAb9Sdi885lXNJS6Ns10hvGsObhpDwuOGsKXXcGh0fVVqTKV4UtqFL2/fNTM7ZvsSeCDUfpGR/Aw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-07T22:48:45.658246Z"},"content_sha256":"dbe0fcc498b7158a3e232f32a5453eb4eb0ca87654145fde910ee842345e8541","schema_version":"1.0","event_id":"sha256:dbe0fcc498b7158a3e232f32a5453eb4eb0ca87654145fde910ee842345e8541"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/YX4XVONCSSEBLCCY7I6HU5P7YI/bundle.json","state_url":"https://pith.science/pith/YX4XVONCSSEBLCCY7I6HU5P7YI/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/YX4XVONCSSEBLCCY7I6HU5P7YI/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":"2026-06-07T22:48:45Z","links":{"resolver":"https://pith.science/pith/YX4XVONCSSEBLCCY7I6HU5P7YI","bundle":"https://pith.science/pith/YX4XVONCSSEBLCCY7I6HU5P7YI/bundle.json","state":"https://pith.science/pith/YX4XVONCSSEBLCCY7I6HU5P7YI/state.json","well_known_bundle":"https://pith.science/.well-known/pith/YX4XVONCSSEBLCCY7I6HU5P7YI/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2013:YX4XVONCSSEBLCCY7I6HU5P7YI","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":"8d86740c2f9dd6866363b05b4d08b2f39f96a5b99702fbbeb43b436ed506ab96","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2013-10-11T09:30:44Z","title_canon_sha256":"57d4a6f7ad4edbebbe81fbd87a14af4d2276f99bb8e5602cf63ffbcdfbaff87f"},"schema_version":"1.0","source":{"id":"1310.3719","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1310.3719","created_at":"2026-05-18T01:47:05Z"},{"alias_kind":"arxiv_version","alias_value":"1310.3719v1","created_at":"2026-05-18T01:47:05Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1310.3719","created_at":"2026-05-18T01:47:05Z"},{"alias_kind":"pith_short_12","alias_value":"YX4XVONCSSEB","created_at":"2026-05-18T12:28:09Z"},{"alias_kind":"pith_short_16","alias_value":"YX4XVONCSSEBLCCY","created_at":"2026-05-18T12:28:09Z"},{"alias_kind":"pith_short_8","alias_value":"YX4XVONC","created_at":"2026-05-18T12:28:09Z"}],"graph_snapshots":[{"event_id":"sha256:dbe0fcc498b7158a3e232f32a5453eb4eb0ca87654145fde910ee842345e8541","target":"graph","created_at":"2026-05-18T01:47:05Z","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":"Dilational materials are stable three-dimensional isotropic auxetics with an ultimate Poisson's ratio of -1. We design, evaluate, fabricate, and characterize crystalline metamaterials approaching this ideal. To reveal all modes, we calculate the phonon band structures. On this basis, using cubic symmetry, we can unambiguously retrieve all different non-zero elements of the rank-4 effective metamaterial elasticity tensor, from which all effective elastic metamaterial properties follow. While the elastic properties and the phase velocity remain anisotropic, the effective Poisson's ratio indeed b","authors_text":"Graeme W. Milton, Martin Wegener, Michael Thiel, Muamer Kadic, Robert Schittny, Tiemo B\\\"uckmann","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2013-10-11T09:30:44Z","title":"On three-dimensional dilational elastic metamaterials"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1310.3719","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":"sha256:559f831a8b4e7cd396c9dd2393a1fe600d1ce31385a61b73929b63d80e9a8ce3","target":"record","created_at":"2026-05-18T01:47:05Z","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":"8d86740c2f9dd6866363b05b4d08b2f39f96a5b99702fbbeb43b436ed506ab96","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2013-10-11T09:30:44Z","title_canon_sha256":"57d4a6f7ad4edbebbe81fbd87a14af4d2276f99bb8e5602cf63ffbcdfbaff87f"},"schema_version":"1.0","source":{"id":"1310.3719","kind":"arxiv","version":1}},"canonical_sha256":"c5f97ab9a29488158858fa3c7a75ffc2194f336a0e23c60ff5d658ef397b71f7","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"c5f97ab9a29488158858fa3c7a75ffc2194f336a0e23c60ff5d658ef397b71f7","first_computed_at":"2026-05-18T01:47:05.763757Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:47:05.763757Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"D/huH9vufNSZGRihVDCTUTu6wQCt81Xl4NKToEZyWpeJO79ErCHyM08Ak9vEHBM6qHSUjXDF5uc8UDPyyFlaAg==","signature_status":"signed_v1","signed_at":"2026-05-18T01:47:05.764290Z","signed_message":"canonical_sha256_bytes"},"source_id":"1310.3719","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:559f831a8b4e7cd396c9dd2393a1fe600d1ce31385a61b73929b63d80e9a8ce3","sha256:dbe0fcc498b7158a3e232f32a5453eb4eb0ca87654145fde910ee842345e8541"],"state_sha256":"dea1fd4b89652d7b4dc664315286473c6fcaaed73e142b9c4958c46ea880cbe7"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"K8kszaXknFeFkMlLspGr/l+w3y4tnZ4/I9V4hYf2jceiGgGCtQmCvwZHZZJRHESKBKIFxR97kCvaePrLr3tvDQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-07T22:48:45.662169Z","bundle_sha256":"03922cdde650a6cc28e9217c41cbf8ff796cf1d3ebef6e472fb56bc63efca534"}}