{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2025:GOBQVWTSCRTJQ6NBFAWSB7GJKI","short_pith_number":"pith:GOBQVWTS","canonical_record":{"source":{"id":"2506.07593","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"physics.app-ph","submitted_at":"2025-06-09T09:44:53Z","cross_cats_sorted":[],"title_canon_sha256":"30a3b5e92724277e5be93c5488c8033662fc3c0f0ed9336b80c4e7cdab2fb5bc","abstract_canon_sha256":"272bd8990faf1a6445109fbdab31e33105fc807d022ef853f2444b08d4c1e0fd"},"schema_version":"1.0"},"canonical_sha256":"33830ada7214669879a1282d20fcc95202d84f576c1a2233ce9bc9009acb1456","source":{"kind":"arxiv","id":"2506.07593","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2506.07593","created_at":"2026-07-05T11:18:30Z"},{"alias_kind":"arxiv_version","alias_value":"2506.07593v1","created_at":"2026-07-05T11:18:30Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2506.07593","created_at":"2026-07-05T11:18:30Z"},{"alias_kind":"pith_short_12","alias_value":"GOBQVWTSCRTJ","created_at":"2026-07-05T11:18:30Z"},{"alias_kind":"pith_short_16","alias_value":"GOBQVWTSCRTJQ6NB","created_at":"2026-07-05T11:18:30Z"},{"alias_kind":"pith_short_8","alias_value":"GOBQVWTS","created_at":"2026-07-05T11:18:30Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2025:GOBQVWTSCRTJQ6NBFAWSB7GJKI","target":"record","payload":{"canonical_record":{"source":{"id":"2506.07593","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"physics.app-ph","submitted_at":"2025-06-09T09:44:53Z","cross_cats_sorted":[],"title_canon_sha256":"30a3b5e92724277e5be93c5488c8033662fc3c0f0ed9336b80c4e7cdab2fb5bc","abstract_canon_sha256":"272bd8990faf1a6445109fbdab31e33105fc807d022ef853f2444b08d4c1e0fd"},"schema_version":"1.0"},"canonical_sha256":"33830ada7214669879a1282d20fcc95202d84f576c1a2233ce9bc9009acb1456","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T11:18:30.018088Z","signature_b64":"Hn/Bi/yzLgkC2hMf61heDhbyxbohz70+CdbOCJ3021QlbWbIDe+trBrgX8Vf8WzeRgWLYQHc4b8YIf5uTEznDw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"33830ada7214669879a1282d20fcc95202d84f576c1a2233ce9bc9009acb1456","last_reissued_at":"2026-07-05T11:18:30.017610Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T11:18:30.017610Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2506.07593","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":"2026-07-05T11:18:30Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"yx1D29N4BFGv8fP+VrPlD0bRp+1DSuv7k3QjSgabuk2JfV6sGfdi0l0XQmH7ViUrC9JysLU3GW+aHxNK5XRjDg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-16T20:17:30.843251Z"},"content_sha256":"9692bbb936b95cf2abe7570568fc0ee8126b26ab2a3b88072c56bc8ae3933f1e","schema_version":"1.0","event_id":"sha256:9692bbb936b95cf2abe7570568fc0ee8126b26ab2a3b88072c56bc8ae3933f1e"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2025:GOBQVWTSCRTJQ6NBFAWSB7GJKI","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Reduced-weight near-cloaks for underwater invisibility","license":"http://creativecommons.org/licenses/by/4.0/","headline":"","cross_cats":[],"primary_cat":"physics.app-ph","authors_text":"Davide Enrico Quadrelli, Francesco Braghin, Gabriele Cazzulani, Sebastiano Cominelli","submitted_at":"2025-06-09T09:44:53Z","abstract_excerpt":"Limiting the total weight of an acoustic cloak is of fundamental importance in underwater applications, where buoyancy of the cloaked object is desirable. Unfortunately, it is well known that traditional cloaking strategies imply either a mass tending to infinity or a total weight equal to the Archimedes' force, thus making a perfect cloak that preserves the buoyancy of the target impossible. In this paper, we discuss strategies to reduce the weight of the cloak seeking a good compromise between weight reduction and acoustic performance. In particular, we compare and combine two existing strat"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2506.07593","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":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/2506.07593/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":"2026-07-05T11:18:30Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"lP9l/yvvM1btprNlX76Q2tJpXQbjVcUA7a03JWlfOL59zL4wFYmwnRHjK3ruSYvY0jXJ3l+4KFNMb4iNRFEBBg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-16T20:17:30.843782Z"},"content_sha256":"0135b63817d04d28cde6f0b5d88a8df4048909887e0e1b279d800d1e6f900e70","schema_version":"1.0","event_id":"sha256:0135b63817d04d28cde6f0b5d88a8df4048909887e0e1b279d800d1e6f900e70"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/GOBQVWTSCRTJQ6NBFAWSB7GJKI/bundle.json","state_url":"https://pith.science/pith/GOBQVWTSCRTJQ6NBFAWSB7GJKI/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/GOBQVWTSCRTJQ6NBFAWSB7GJKI/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":"2026-08-16T20:17:30Z","links":{"resolver":"https://pith.science/pith/GOBQVWTSCRTJQ6NBFAWSB7GJKI","bundle":"https://pith.science/pith/GOBQVWTSCRTJQ6NBFAWSB7GJKI/bundle.json","state":"https://pith.science/pith/GOBQVWTSCRTJQ6NBFAWSB7GJKI/state.json","well_known_bundle":"https://pith.science/.well-known/pith/GOBQVWTSCRTJQ6NBFAWSB7GJKI/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2025:GOBQVWTSCRTJQ6NBFAWSB7GJKI","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":"272bd8990faf1a6445109fbdab31e33105fc807d022ef853f2444b08d4c1e0fd","cross_cats_sorted":[],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"physics.app-ph","submitted_at":"2025-06-09T09:44:53Z","title_canon_sha256":"30a3b5e92724277e5be93c5488c8033662fc3c0f0ed9336b80c4e7cdab2fb5bc"},"schema_version":"1.0","source":{"id":"2506.07593","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2506.07593","created_at":"2026-07-05T11:18:30Z"},{"alias_kind":"arxiv_version","alias_value":"2506.07593v1","created_at":"2026-07-05T11:18:30Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2506.07593","created_at":"2026-07-05T11:18:30Z"},{"alias_kind":"pith_short_12","alias_value":"GOBQVWTSCRTJ","created_at":"2026-07-05T11:18:30Z"},{"alias_kind":"pith_short_16","alias_value":"GOBQVWTSCRTJQ6NB","created_at":"2026-07-05T11:18:30Z"},{"alias_kind":"pith_short_8","alias_value":"GOBQVWTS","created_at":"2026-07-05T11:18:30Z"}],"graph_snapshots":[{"event_id":"sha256:0135b63817d04d28cde6f0b5d88a8df4048909887e0e1b279d800d1e6f900e70","target":"graph","created_at":"2026-07-05T11:18:30Z","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/2506.07593/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"Limiting the total weight of an acoustic cloak is of fundamental importance in underwater applications, where buoyancy of the cloaked object is desirable. Unfortunately, it is well known that traditional cloaking strategies imply either a mass tending to infinity or a total weight equal to the Archimedes' force, thus making a perfect cloak that preserves the buoyancy of the target impossible. In this paper, we discuss strategies to reduce the weight of the cloak seeking a good compromise between weight reduction and acoustic performance. In particular, we compare and combine two existing strat","authors_text":"Davide Enrico Quadrelli, Francesco Braghin, Gabriele Cazzulani, Sebastiano Cominelli","cross_cats":[],"headline":"","license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"physics.app-ph","submitted_at":"2025-06-09T09:44:53Z","title":"Reduced-weight near-cloaks for underwater invisibility"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2506.07593","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":"sha256:9692bbb936b95cf2abe7570568fc0ee8126b26ab2a3b88072c56bc8ae3933f1e","target":"record","created_at":"2026-07-05T11:18:30Z","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":"272bd8990faf1a6445109fbdab31e33105fc807d022ef853f2444b08d4c1e0fd","cross_cats_sorted":[],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"physics.app-ph","submitted_at":"2025-06-09T09:44:53Z","title_canon_sha256":"30a3b5e92724277e5be93c5488c8033662fc3c0f0ed9336b80c4e7cdab2fb5bc"},"schema_version":"1.0","source":{"id":"2506.07593","kind":"arxiv","version":1}},"canonical_sha256":"33830ada7214669879a1282d20fcc95202d84f576c1a2233ce9bc9009acb1456","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"33830ada7214669879a1282d20fcc95202d84f576c1a2233ce9bc9009acb1456","first_computed_at":"2026-07-05T11:18:30.017610Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T11:18:30.017610Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"Hn/Bi/yzLgkC2hMf61heDhbyxbohz70+CdbOCJ3021QlbWbIDe+trBrgX8Vf8WzeRgWLYQHc4b8YIf5uTEznDw==","signature_status":"signed_v1","signed_at":"2026-07-05T11:18:30.018088Z","signed_message":"canonical_sha256_bytes"},"source_id":"2506.07593","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:9692bbb936b95cf2abe7570568fc0ee8126b26ab2a3b88072c56bc8ae3933f1e","sha256:0135b63817d04d28cde6f0b5d88a8df4048909887e0e1b279d800d1e6f900e70"],"state_sha256":"84ad4837e7bf785af08639dcdc84e71003d08f741046e737e71b644533a77545"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"CrOxecLetHQrmhWSeiwbAYu9V1CJJV4PN0UiH0PIx45Zvglr0O5dOmuUM0cuYP/XWCJFIXfk0hLeyu9cVbSbDw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-16T20:17:30.849634Z","bundle_sha256":"d98ac09d35fc0151032a499a84375a6ce51a753909a8267122a1a9e186699910"}}