{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2016:W745XSEWP6OOM4WMXV6CKGTHZ4","short_pith_number":"pith:W745XSEW","canonical_record":{"source":{"id":"1604.08402","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"stat.ML","submitted_at":"2016-04-28T13:11:54Z","cross_cats_sorted":["cs.CR","cs.IR"],"title_canon_sha256":"0ede32a967a3067432844933a6d3437979eefed070f0e40e2d570711ee589d67","abstract_canon_sha256":"6d55aa09521170a036ecae7dcf8b52a12ecc7d9d208e24f1ea88982576ab11e9"},"schema_version":"1.0"},"canonical_sha256":"b7f9dbc8967f9ce672ccbd7c251a67cf3a485a142d040145e1990ae10c302588","source":{"kind":"arxiv","id":"1604.08402","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1604.08402","created_at":"2026-05-18T01:16:04Z"},{"alias_kind":"arxiv_version","alias_value":"1604.08402v1","created_at":"2026-05-18T01:16:04Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1604.08402","created_at":"2026-05-18T01:16:04Z"},{"alias_kind":"pith_short_12","alias_value":"W745XSEWP6OO","created_at":"2026-05-18T12:30:48Z"},{"alias_kind":"pith_short_16","alias_value":"W745XSEWP6OOM4WM","created_at":"2026-05-18T12:30:48Z"},{"alias_kind":"pith_short_8","alias_value":"W745XSEW","created_at":"2026-05-18T12:30:48Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2016:W745XSEWP6OOM4WMXV6CKGTHZ4","target":"record","payload":{"canonical_record":{"source":{"id":"1604.08402","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"stat.ML","submitted_at":"2016-04-28T13:11:54Z","cross_cats_sorted":["cs.CR","cs.IR"],"title_canon_sha256":"0ede32a967a3067432844933a6d3437979eefed070f0e40e2d570711ee589d67","abstract_canon_sha256":"6d55aa09521170a036ecae7dcf8b52a12ecc7d9d208e24f1ea88982576ab11e9"},"schema_version":"1.0"},"canonical_sha256":"b7f9dbc8967f9ce672ccbd7c251a67cf3a485a142d040145e1990ae10c302588","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:16:04.086970Z","signature_b64":"y0uPt5c74F3zllRZxrKvud2NizEtcKYK10kqImTC5xYd2JD3mIQcjw34dTw0BkUs3gMD5GgNJLzr2+TOUu2XBQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"b7f9dbc8967f9ce672ccbd7c251a67cf3a485a142d040145e1990ae10c302588","last_reissued_at":"2026-05-18T01:16:04.086300Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:16:04.086300Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1604.08402","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":"2026-05-18T01:16:04Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"xBgrtr7XI69SIWR5WIudbrtcz2FKee+KkHcvqGg+wNEeF1fqokmutncI99Mc2DhldzMf3S2ECiRW/VAeMS9VBA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-01T12:24:59.317847Z"},"content_sha256":"3cf5e6ba08130d6af57a3dd4c62f040b7d0ef277cbc9b69fd77f9673507c6e37","schema_version":"1.0","event_id":"sha256:3cf5e6ba08130d6af57a3dd4c62f040b7d0ef277cbc9b69fd77f9673507c6e37"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2016:W745XSEWP6OOM4WMXV6CKGTHZ4","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Two Differentially Private Rating Collection Mechanisms for Recommender Systems","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["cs.CR","cs.IR"],"primary_cat":"stat.ML","authors_text":"Wenjie Zheng","submitted_at":"2016-04-28T13:11:54Z","abstract_excerpt":"We design two mechanisms for the recommender system to collect user ratings. One is modified Laplace mechanism, and the other is randomized response mechanism. We prove that they are both differentially private and preserve the data utility."},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1604.08402","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":"2026-05-18T01:16:04Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"fTpBdrvrSBK533rKZaGfltjlYFnxdXdgAa8thKPdgYvxtIf9XHtYT1f/oh3KdSEp6wk77jTkChc6/t4zFoDaAQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-01T12:24:59.318190Z"},"content_sha256":"69b8cd1a373905752a4092b85f6cd3780d6681be1bc06d5e8f87c67f03004fa6","schema_version":"1.0","event_id":"sha256:69b8cd1a373905752a4092b85f6cd3780d6681be1bc06d5e8f87c67f03004fa6"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/W745XSEWP6OOM4WMXV6CKGTHZ4/bundle.json","state_url":"https://pith.science/pith/W745XSEWP6OOM4WMXV6CKGTHZ4/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/W745XSEWP6OOM4WMXV6CKGTHZ4/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":"2026-07-01T12:24:59Z","links":{"resolver":"https://pith.science/pith/W745XSEWP6OOM4WMXV6CKGTHZ4","bundle":"https://pith.science/pith/W745XSEWP6OOM4WMXV6CKGTHZ4/bundle.json","state":"https://pith.science/pith/W745XSEWP6OOM4WMXV6CKGTHZ4/state.json","well_known_bundle":"https://pith.science/.well-known/pith/W745XSEWP6OOM4WMXV6CKGTHZ4/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2016:W745XSEWP6OOM4WMXV6CKGTHZ4","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":"6d55aa09521170a036ecae7dcf8b52a12ecc7d9d208e24f1ea88982576ab11e9","cross_cats_sorted":["cs.CR","cs.IR"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"stat.ML","submitted_at":"2016-04-28T13:11:54Z","title_canon_sha256":"0ede32a967a3067432844933a6d3437979eefed070f0e40e2d570711ee589d67"},"schema_version":"1.0","source":{"id":"1604.08402","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1604.08402","created_at":"2026-05-18T01:16:04Z"},{"alias_kind":"arxiv_version","alias_value":"1604.08402v1","created_at":"2026-05-18T01:16:04Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1604.08402","created_at":"2026-05-18T01:16:04Z"},{"alias_kind":"pith_short_12","alias_value":"W745XSEWP6OO","created_at":"2026-05-18T12:30:48Z"},{"alias_kind":"pith_short_16","alias_value":"W745XSEWP6OOM4WM","created_at":"2026-05-18T12:30:48Z"},{"alias_kind":"pith_short_8","alias_value":"W745XSEW","created_at":"2026-05-18T12:30:48Z"}],"graph_snapshots":[{"event_id":"sha256:69b8cd1a373905752a4092b85f6cd3780d6681be1bc06d5e8f87c67f03004fa6","target":"graph","created_at":"2026-05-18T01:16:04Z","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":"We design two mechanisms for the recommender system to collect user ratings. One is modified Laplace mechanism, and the other is randomized response mechanism. We prove that they are both differentially private and preserve the data utility.","authors_text":"Wenjie Zheng","cross_cats":["cs.CR","cs.IR"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"stat.ML","submitted_at":"2016-04-28T13:11:54Z","title":"Two Differentially Private Rating Collection Mechanisms for Recommender Systems"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1604.08402","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":"sha256:3cf5e6ba08130d6af57a3dd4c62f040b7d0ef277cbc9b69fd77f9673507c6e37","target":"record","created_at":"2026-05-18T01:16:04Z","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":"6d55aa09521170a036ecae7dcf8b52a12ecc7d9d208e24f1ea88982576ab11e9","cross_cats_sorted":["cs.CR","cs.IR"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"stat.ML","submitted_at":"2016-04-28T13:11:54Z","title_canon_sha256":"0ede32a967a3067432844933a6d3437979eefed070f0e40e2d570711ee589d67"},"schema_version":"1.0","source":{"id":"1604.08402","kind":"arxiv","version":1}},"canonical_sha256":"b7f9dbc8967f9ce672ccbd7c251a67cf3a485a142d040145e1990ae10c302588","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"b7f9dbc8967f9ce672ccbd7c251a67cf3a485a142d040145e1990ae10c302588","first_computed_at":"2026-05-18T01:16:04.086300Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:16:04.086300Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"y0uPt5c74F3zllRZxrKvud2NizEtcKYK10kqImTC5xYd2JD3mIQcjw34dTw0BkUs3gMD5GgNJLzr2+TOUu2XBQ==","signature_status":"signed_v1","signed_at":"2026-05-18T01:16:04.086970Z","signed_message":"canonical_sha256_bytes"},"source_id":"1604.08402","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:3cf5e6ba08130d6af57a3dd4c62f040b7d0ef277cbc9b69fd77f9673507c6e37","sha256:69b8cd1a373905752a4092b85f6cd3780d6681be1bc06d5e8f87c67f03004fa6"],"state_sha256":"04a19fe15a6bdb0fc68a52bb667687f5f0702ce62f4ae89afee9880f4ad528ce"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"xxKEoVh/ZZaWkQrriTwnoNHL1O+OwLnj237JmOCLQiXDFqYQxFhzUM39qezKkcO7xBpPZlLUOSV0Rn+c+kjoBw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-07-01T12:24:59.320092Z","bundle_sha256":"ff59efc7e2374e183c22bbeca25538893aa14576c7335565ca7f45167506702e"}}