{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2015:QJKD6RQTSKGRQ2JOE5K6CYVX63","short_pith_number":"pith:QJKD6RQT","canonical_record":{"source":{"id":"1505.04456","kind":"arxiv","version":3},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2015-05-17T21:12:53Z","cross_cats_sorted":[],"title_canon_sha256":"64e5f8451399c5285bcd49e7dd9d871f17e61f21ad1d7259a91aed7e3b6ec647","abstract_canon_sha256":"85ed4ac14f1c25801c3a7843082444d89388464eca018c76e07498fea958b2dd"},"schema_version":"1.0"},"canonical_sha256":"82543f4613928d18692e2755e162b7f6fb6ca4089f29f9642b55bae7ea289e0e","source":{"kind":"arxiv","id":"1505.04456","version":3},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1505.04456","created_at":"2026-05-18T01:11:55Z"},{"alias_kind":"arxiv_version","alias_value":"1505.04456v3","created_at":"2026-05-18T01:11:55Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1505.04456","created_at":"2026-05-18T01:11:55Z"},{"alias_kind":"pith_short_12","alias_value":"QJKD6RQTSKGR","created_at":"2026-05-18T12:29:37Z"},{"alias_kind":"pith_short_16","alias_value":"QJKD6RQTSKGRQ2JO","created_at":"2026-05-18T12:29:37Z"},{"alias_kind":"pith_short_8","alias_value":"QJKD6RQT","created_at":"2026-05-18T12:29:37Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2015:QJKD6RQTSKGRQ2JOE5K6CYVX63","target":"record","payload":{"canonical_record":{"source":{"id":"1505.04456","kind":"arxiv","version":3},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2015-05-17T21:12:53Z","cross_cats_sorted":[],"title_canon_sha256":"64e5f8451399c5285bcd49e7dd9d871f17e61f21ad1d7259a91aed7e3b6ec647","abstract_canon_sha256":"85ed4ac14f1c25801c3a7843082444d89388464eca018c76e07498fea958b2dd"},"schema_version":"1.0"},"canonical_sha256":"82543f4613928d18692e2755e162b7f6fb6ca4089f29f9642b55bae7ea289e0e","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:11:55.171762Z","signature_b64":"F4LOvTBNn5YdO5gCwbrFutj8XG5KfcCfPmTBCwAm42U+kaRY/IV4gyej2N7hxKgnvuvFXqd+5SATgyKyDzGxDA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"82543f4613928d18692e2755e162b7f6fb6ca4089f29f9642b55bae7ea289e0e","last_reissued_at":"2026-05-18T01:11:55.171422Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:11:55.171422Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1505.04456","source_version":3,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T01:11:55Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"+MPmXDMI6y5NbFlp7UFcNezzhY6JYGMTVB8zk8YqrIiZZfabawT37d7I+QdoxZmRlFP85xhOzWKmJ0Uh+uKYBQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-02T03:15:15.169167Z"},"content_sha256":"1885960644b322e23546f129647c953c3b34311c37836773f5b5fb189628337c","schema_version":"1.0","event_id":"sha256:1885960644b322e23546f129647c953c3b34311c37836773f5b5fb189628337c"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2015:QJKD6RQTSKGRQ2JOE5K6CYVX63","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Manipulating waves with LEGO$^{\\circledR}$ bricks: A versatile experimental platform for metamaterial architectures","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"cond-mat.mtrl-sci","authors_text":"Paolo Celli, Stefano Gonella","submitted_at":"2015-05-17T21:12:53Z","abstract_excerpt":"In this letter, we discuss a versatile, fully-reconfigurable experimental platform for the investigation of phononic phenomena in metamaterial architectures. The approach revolves around the use of 3D laser vibrometry to reconstruct global and local wavefield features in specimens obtained through simple arrangements of LEGO$^{\\circledR}$ bricks on a thin baseplate. The agility by which it is possible to reconfigure the brick patterns into a nearly endless spectrum of topologies makes this an effective approach for rapid experimental proof of concept, as well as a powerful didactic tool, in th"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1505.04456","kind":"arxiv","version":3},"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":"2026-05-18T01:11:55Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"y/BPbLm6j0uca50Q1gw4VTpKIRj/mTvXoGMjiwZr8DeXOISCY+FWotnhIB0i4UOTzymfVKF93wU64r5Sb7W3Dw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-02T03:15:15.169539Z"},"content_sha256":"aa95be13fc0c99a760cbbee837ee9a163a801f894310434d074afe5bc56c2d43","schema_version":"1.0","event_id":"sha256:aa95be13fc0c99a760cbbee837ee9a163a801f894310434d074afe5bc56c2d43"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/QJKD6RQTSKGRQ2JOE5K6CYVX63/bundle.json","state_url":"https://pith.science/pith/QJKD6RQTSKGRQ2JOE5K6CYVX63/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/QJKD6RQTSKGRQ2JOE5K6CYVX63/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":"2026-06-02T03:15:15Z","links":{"resolver":"https://pith.science/pith/QJKD6RQTSKGRQ2JOE5K6CYVX63","bundle":"https://pith.science/pith/QJKD6RQTSKGRQ2JOE5K6CYVX63/bundle.json","state":"https://pith.science/pith/QJKD6RQTSKGRQ2JOE5K6CYVX63/state.json","well_known_bundle":"https://pith.science/.well-known/pith/QJKD6RQTSKGRQ2JOE5K6CYVX63/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2015:QJKD6RQTSKGRQ2JOE5K6CYVX63","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":"85ed4ac14f1c25801c3a7843082444d89388464eca018c76e07498fea958b2dd","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2015-05-17T21:12:53Z","title_canon_sha256":"64e5f8451399c5285bcd49e7dd9d871f17e61f21ad1d7259a91aed7e3b6ec647"},"schema_version":"1.0","source":{"id":"1505.04456","kind":"arxiv","version":3}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1505.04456","created_at":"2026-05-18T01:11:55Z"},{"alias_kind":"arxiv_version","alias_value":"1505.04456v3","created_at":"2026-05-18T01:11:55Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1505.04456","created_at":"2026-05-18T01:11:55Z"},{"alias_kind":"pith_short_12","alias_value":"QJKD6RQTSKGR","created_at":"2026-05-18T12:29:37Z"},{"alias_kind":"pith_short_16","alias_value":"QJKD6RQTSKGRQ2JO","created_at":"2026-05-18T12:29:37Z"},{"alias_kind":"pith_short_8","alias_value":"QJKD6RQT","created_at":"2026-05-18T12:29:37Z"}],"graph_snapshots":[{"event_id":"sha256:aa95be13fc0c99a760cbbee837ee9a163a801f894310434d074afe5bc56c2d43","target":"graph","created_at":"2026-05-18T01:11:55Z","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":"In this letter, we discuss a versatile, fully-reconfigurable experimental platform for the investigation of phononic phenomena in metamaterial architectures. The approach revolves around the use of 3D laser vibrometry to reconstruct global and local wavefield features in specimens obtained through simple arrangements of LEGO$^{\\circledR}$ bricks on a thin baseplate. The agility by which it is possible to reconfigure the brick patterns into a nearly endless spectrum of topologies makes this an effective approach for rapid experimental proof of concept, as well as a powerful didactic tool, in th","authors_text":"Paolo Celli, Stefano Gonella","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2015-05-17T21:12:53Z","title":"Manipulating waves with LEGO$^{\\circledR}$ bricks: A versatile experimental platform for metamaterial architectures"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1505.04456","kind":"arxiv","version":3},"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":"sha256:1885960644b322e23546f129647c953c3b34311c37836773f5b5fb189628337c","target":"record","created_at":"2026-05-18T01:11:55Z","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":"85ed4ac14f1c25801c3a7843082444d89388464eca018c76e07498fea958b2dd","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2015-05-17T21:12:53Z","title_canon_sha256":"64e5f8451399c5285bcd49e7dd9d871f17e61f21ad1d7259a91aed7e3b6ec647"},"schema_version":"1.0","source":{"id":"1505.04456","kind":"arxiv","version":3}},"canonical_sha256":"82543f4613928d18692e2755e162b7f6fb6ca4089f29f9642b55bae7ea289e0e","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"82543f4613928d18692e2755e162b7f6fb6ca4089f29f9642b55bae7ea289e0e","first_computed_at":"2026-05-18T01:11:55.171422Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:11:55.171422Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"F4LOvTBNn5YdO5gCwbrFutj8XG5KfcCfPmTBCwAm42U+kaRY/IV4gyej2N7hxKgnvuvFXqd+5SATgyKyDzGxDA==","signature_status":"signed_v1","signed_at":"2026-05-18T01:11:55.171762Z","signed_message":"canonical_sha256_bytes"},"source_id":"1505.04456","source_kind":"arxiv","source_version":3}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:1885960644b322e23546f129647c953c3b34311c37836773f5b5fb189628337c","sha256:aa95be13fc0c99a760cbbee837ee9a163a801f894310434d074afe5bc56c2d43"],"state_sha256":"6d0f0ad841853ad969d1b02c17127aa69789b4f836ee781a85de0dc465ccb82b"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"q/8f+5P4f9v1VaevWlhevk0m5JOi0mRsOCsVyuyEmRKQrbVkI7TWScgT7JOPYc5/1BWNnFhhCSUsLpqI3vPTBQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-02T03:15:15.171481Z","bundle_sha256":"9b3552ea737ceec84f34533983c84b1f57d64e74a8f854f42df6675f73378cb5"}}