{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2026:4Z4JFXLDBTLMCEU73E3W7V7A7Q","short_pith_number":"pith:4Z4JFXLD","canonical_record":{"source":{"id":"2606.27976","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"cs.CR","submitted_at":"2026-06-26T11:26:53Z","cross_cats_sorted":["cs.AI","cs.IR"],"title_canon_sha256":"bed0ffacd3290e31aac92912327a7ba8e66960fa8d0ddc29ac65f83070a3e750","abstract_canon_sha256":"485249e1571be469c6ed094fe974cb6bc443a1d8c7fa52492a333d7f0a1d841b"},"schema_version":"1.0"},"canonical_sha256":"e67892dd630cd6c1129fd9376fd7e0fc1e9b35197f15191aa81a161a9d388c2c","source":{"kind":"arxiv","id":"2606.27976","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2606.27976","created_at":"2026-06-29T01:14:54Z"},{"alias_kind":"arxiv_version","alias_value":"2606.27976v1","created_at":"2026-06-29T01:14:54Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2606.27976","created_at":"2026-06-29T01:14:54Z"},{"alias_kind":"pith_short_12","alias_value":"4Z4JFXLDBTLM","created_at":"2026-06-29T01:14:54Z"},{"alias_kind":"pith_short_16","alias_value":"4Z4JFXLDBTLMCEU7","created_at":"2026-06-29T01:14:54Z"},{"alias_kind":"pith_short_8","alias_value":"4Z4JFXLD","created_at":"2026-06-29T01:14:54Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2026:4Z4JFXLDBTLMCEU73E3W7V7A7Q","target":"record","payload":{"canonical_record":{"source":{"id":"2606.27976","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"cs.CR","submitted_at":"2026-06-26T11:26:53Z","cross_cats_sorted":["cs.AI","cs.IR"],"title_canon_sha256":"bed0ffacd3290e31aac92912327a7ba8e66960fa8d0ddc29ac65f83070a3e750","abstract_canon_sha256":"485249e1571be469c6ed094fe974cb6bc443a1d8c7fa52492a333d7f0a1d841b"},"schema_version":"1.0"},"canonical_sha256":"e67892dd630cd6c1129fd9376fd7e0fc1e9b35197f15191aa81a161a9d388c2c","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-06-29T01:14:54.358205Z","signature_b64":"onO0G5fROh/yq7ttzami29coZ+yZVsSNhxcaHQpTD5YMsF2+AhJkN1RdP2iT7/b3lz0V1FWjZN8EdRlYmoDoDA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"e67892dd630cd6c1129fd9376fd7e0fc1e9b35197f15191aa81a161a9d388c2c","last_reissued_at":"2026-06-29T01:14:54.357842Z","signature_status":"signed_v1","first_computed_at":"2026-06-29T01:14:54.357842Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2606.27976","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":"2026-06-29T01:14:54Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"Rn/ogNyuNSG3uITyvNDM78vBfo4k2UNPj/ApQSqPlegdh9y1ak0ZjcYrID/05iFn9Z+i0Dr7t+o7E1HN+KAhDQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-01T22:20:47.937929Z"},"content_sha256":"7eb7a974c97e9b43379ec909ba1d98a337c14e7c97bf715209feaa9c260752d5","schema_version":"1.0","event_id":"sha256:7eb7a974c97e9b43379ec909ba1d98a337c14e7c97bf715209feaa9c260752d5"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2026:4Z4JFXLDBTLMCEU73E3W7V7A7Q","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"SHARD: cell-keyed residual splitting for alignment-resistant private dense retrieval","license":"http://creativecommons.org/licenses/by/4.0/","headline":"","cross_cats":["cs.AI","cs.IR"],"primary_cat":"cs.CR","authors_text":"Sergey Kurilenko","submitted_at":"2026-06-26T11:26:53Z","abstract_excerpt":"Dense embeddings underpin semantic search and RAG, yet a leaked vector store hands much of the underlying text back to whoever holds it. The attacks that make this possible (few-shot alignment, zero-shot inversion, unsupervised cross-space translation) share one weakness: the protected store is a single global geometry that can be aligned to a known one. A secret global rotation, the usual lightweight defence, is no exception: orthogonal Procrustes recovers it once the attacker has about the subspace dimension in known pairs.\n  We introduce Shard, a retrieval-preserving embedding transform tha"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2606.27976","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/2606.27976/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":"2026-06-29T01:14:54Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"KbFvSjI+2vlb0Jt64YgxgnrNJyb673VwIjfuI2uqSIhluhB0YwvOEbx0CqA+JjECfmcl4Eqc2zQ+Om9G8h+uBg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-01T22:20:47.938328Z"},"content_sha256":"cbea2352dc870b5bf42c43d3cb20dae5c4ba3c97d150e2429c79a110d7508809","schema_version":"1.0","event_id":"sha256:cbea2352dc870b5bf42c43d3cb20dae5c4ba3c97d150e2429c79a110d7508809"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/4Z4JFXLDBTLMCEU73E3W7V7A7Q/bundle.json","state_url":"https://pith.science/pith/4Z4JFXLDBTLMCEU73E3W7V7A7Q/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/4Z4JFXLDBTLMCEU73E3W7V7A7Q/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":"2026-07-01T22:20:47Z","links":{"resolver":"https://pith.science/pith/4Z4JFXLDBTLMCEU73E3W7V7A7Q","bundle":"https://pith.science/pith/4Z4JFXLDBTLMCEU73E3W7V7A7Q/bundle.json","state":"https://pith.science/pith/4Z4JFXLDBTLMCEU73E3W7V7A7Q/state.json","well_known_bundle":"https://pith.science/.well-known/pith/4Z4JFXLDBTLMCEU73E3W7V7A7Q/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2026:4Z4JFXLDBTLMCEU73E3W7V7A7Q","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":"485249e1571be469c6ed094fe974cb6bc443a1d8c7fa52492a333d7f0a1d841b","cross_cats_sorted":["cs.AI","cs.IR"],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"cs.CR","submitted_at":"2026-06-26T11:26:53Z","title_canon_sha256":"bed0ffacd3290e31aac92912327a7ba8e66960fa8d0ddc29ac65f83070a3e750"},"schema_version":"1.0","source":{"id":"2606.27976","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2606.27976","created_at":"2026-06-29T01:14:54Z"},{"alias_kind":"arxiv_version","alias_value":"2606.27976v1","created_at":"2026-06-29T01:14:54Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2606.27976","created_at":"2026-06-29T01:14:54Z"},{"alias_kind":"pith_short_12","alias_value":"4Z4JFXLDBTLM","created_at":"2026-06-29T01:14:54Z"},{"alias_kind":"pith_short_16","alias_value":"4Z4JFXLDBTLMCEU7","created_at":"2026-06-29T01:14:54Z"},{"alias_kind":"pith_short_8","alias_value":"4Z4JFXLD","created_at":"2026-06-29T01:14:54Z"}],"graph_snapshots":[{"event_id":"sha256:cbea2352dc870b5bf42c43d3cb20dae5c4ba3c97d150e2429c79a110d7508809","target":"graph","created_at":"2026-06-29T01:14:54Z","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/2606.27976/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"Dense embeddings underpin semantic search and RAG, yet a leaked vector store hands much of the underlying text back to whoever holds it. The attacks that make this possible (few-shot alignment, zero-shot inversion, unsupervised cross-space translation) share one weakness: the protected store is a single global geometry that can be aligned to a known one. A secret global rotation, the usual lightweight defence, is no exception: orthogonal Procrustes recovers it once the attacker has about the subspace dimension in known pairs.\n  We introduce Shard, a retrieval-preserving embedding transform tha","authors_text":"Sergey Kurilenko","cross_cats":["cs.AI","cs.IR"],"headline":"","license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"cs.CR","submitted_at":"2026-06-26T11:26:53Z","title":"SHARD: cell-keyed residual splitting for alignment-resistant private dense retrieval"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2606.27976","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":"sha256:7eb7a974c97e9b43379ec909ba1d98a337c14e7c97bf715209feaa9c260752d5","target":"record","created_at":"2026-06-29T01:14:54Z","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":"485249e1571be469c6ed094fe974cb6bc443a1d8c7fa52492a333d7f0a1d841b","cross_cats_sorted":["cs.AI","cs.IR"],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"cs.CR","submitted_at":"2026-06-26T11:26:53Z","title_canon_sha256":"bed0ffacd3290e31aac92912327a7ba8e66960fa8d0ddc29ac65f83070a3e750"},"schema_version":"1.0","source":{"id":"2606.27976","kind":"arxiv","version":1}},"canonical_sha256":"e67892dd630cd6c1129fd9376fd7e0fc1e9b35197f15191aa81a161a9d388c2c","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"e67892dd630cd6c1129fd9376fd7e0fc1e9b35197f15191aa81a161a9d388c2c","first_computed_at":"2026-06-29T01:14:54.357842Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-06-29T01:14:54.357842Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"onO0G5fROh/yq7ttzami29coZ+yZVsSNhxcaHQpTD5YMsF2+AhJkN1RdP2iT7/b3lz0V1FWjZN8EdRlYmoDoDA==","signature_status":"signed_v1","signed_at":"2026-06-29T01:14:54.358205Z","signed_message":"canonical_sha256_bytes"},"source_id":"2606.27976","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:7eb7a974c97e9b43379ec909ba1d98a337c14e7c97bf715209feaa9c260752d5","sha256:cbea2352dc870b5bf42c43d3cb20dae5c4ba3c97d150e2429c79a110d7508809"],"state_sha256":"97cf97e7f3a4412c0abd80455dcb9e42b0c3a2571bd1e51ce258b520d46f03dc"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"fsqZFVWuPapEGKqCpRVz/zZO68baU21Oyl+ma7H7j2PMOqbbz6MXdSPs7KZSRVxdWoMpIFunQwjSG27zLoZsCA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-07-01T22:20:47.940381Z","bundle_sha256":"f2210208a20e15bf3922b6a7b7797352fb5c98c24c8a77a508e78bfc3bd248f6"}}