{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2021:ADE5DAGFOP3CLE5HSABDUBFZMG","short_pith_number":"pith:ADE5DAGF","canonical_record":{"source":{"id":"2111.11509","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"cs.IR","submitted_at":"2021-11-22T20:09:38Z","cross_cats_sorted":["cs.LG"],"title_canon_sha256":"5760b351148414fb815d0f6c316f3cebda641d86a7a33b751ba9aaf6546fe221","abstract_canon_sha256":"2cd1cf0b21377a676b25e3aea9a7515bb9f18dea18035a226602174e5ae30a71"},"schema_version":"1.0"},"canonical_sha256":"00c9d180c573f62593a790023a04b961b9ab10dc230158f3288fa1dcf8f8bae8","source":{"kind":"arxiv","id":"2111.11509","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2111.11509","created_at":"2026-07-05T03:34:55Z"},{"alias_kind":"arxiv_version","alias_value":"2111.11509v1","created_at":"2026-07-05T03:34:55Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2111.11509","created_at":"2026-07-05T03:34:55Z"},{"alias_kind":"pith_short_12","alias_value":"ADE5DAGFOP3C","created_at":"2026-07-05T03:34:55Z"},{"alias_kind":"pith_short_16","alias_value":"ADE5DAGFOP3CLE5H","created_at":"2026-07-05T03:34:55Z"},{"alias_kind":"pith_short_8","alias_value":"ADE5DAGF","created_at":"2026-07-05T03:34:55Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2021:ADE5DAGFOP3CLE5HSABDUBFZMG","target":"record","payload":{"canonical_record":{"source":{"id":"2111.11509","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"cs.IR","submitted_at":"2021-11-22T20:09:38Z","cross_cats_sorted":["cs.LG"],"title_canon_sha256":"5760b351148414fb815d0f6c316f3cebda641d86a7a33b751ba9aaf6546fe221","abstract_canon_sha256":"2cd1cf0b21377a676b25e3aea9a7515bb9f18dea18035a226602174e5ae30a71"},"schema_version":"1.0"},"canonical_sha256":"00c9d180c573f62593a790023a04b961b9ab10dc230158f3288fa1dcf8f8bae8","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T03:34:55.022139Z","signature_b64":"7Hpl+z5zHAbgxtzFQ4qFrZCqJ1683BkNB55bBh5NOrSntNvl9iwWnfITCbXhUhOXDbiPcwJUp8dmezj3iye8BA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"00c9d180c573f62593a790023a04b961b9ab10dc230158f3288fa1dcf8f8bae8","last_reissued_at":"2026-07-05T03:34:55.021655Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T03:34:55.021655Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2111.11509","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":"2026-07-05T03:34:55Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"VO0zmCxmlo03RLcfUKnN1WRB+Fw1pepYljUEsCOTgX7zuQwbqNgr6v849OZViHmrLVLRoMcWByUGprbkni25BQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-05T15:44:29.171396Z"},"content_sha256":"32bd2c92f09e5e53fd2f45dda6be053ccc1e7fe840908dfbc3f961fe55dc130c","schema_version":"1.0","event_id":"sha256:32bd2c92f09e5e53fd2f45dda6be053ccc1e7fe840908dfbc3f961fe55dc130c"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2021:ADE5DAGFOP3CLE5HSABDUBFZMG","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Blockchain-based Recommender Systems: Applications, Challenges and Future Opportunities","license":"http://creativecommons.org/licenses/by/4.0/","headline":"","cross_cats":["cs.LG"],"primary_cat":"cs.IR","authors_text":"Abbes Amira, Abdullah Alsalemi, Aya Sayed, Christos Sardianos, Faycal Bensaali, George Dimitrakopoulos, Iraklis Varlamis, Magdalini Eirinaki, Yassine Himeur","submitted_at":"2021-11-22T20:09:38Z","abstract_excerpt":"Recommender systems have been widely used in different application domains including energy-preservation, e-commerce, healthcare, social media, etc. Such applications require the analysis and mining of massive amounts of various types of user data, including demographics, preferences, social interactions, etc. in order to develop accurate and precise recommender systems. Such datasets often include sensitive information, yet most recommender systems are focusing on the models' accuracy and ignore issues related to security and the users' privacy. Despite the efforts to overcome these problems "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2111.11509","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/2111.11509/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":"2026-07-05T03:34:55Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"zaGriMMYcnhI6rIAAfImU45lQha00x65aqKbc21z14N9PXCyDpusCrmR20sp3nOkwE1HHUZ6PyUdvl0E4B6HCA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-05T15:44:29.171782Z"},"content_sha256":"8a38bbdf87761f7f825086791f78202ab546017d7d07291addea0a7ac941ad68","schema_version":"1.0","event_id":"sha256:8a38bbdf87761f7f825086791f78202ab546017d7d07291addea0a7ac941ad68"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/ADE5DAGFOP3CLE5HSABDUBFZMG/bundle.json","state_url":"https://pith.science/pith/ADE5DAGFOP3CLE5HSABDUBFZMG/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/ADE5DAGFOP3CLE5HSABDUBFZMG/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":"2026-07-05T15:44:29Z","links":{"resolver":"https://pith.science/pith/ADE5DAGFOP3CLE5HSABDUBFZMG","bundle":"https://pith.science/pith/ADE5DAGFOP3CLE5HSABDUBFZMG/bundle.json","state":"https://pith.science/pith/ADE5DAGFOP3CLE5HSABDUBFZMG/state.json","well_known_bundle":"https://pith.science/.well-known/pith/ADE5DAGFOP3CLE5HSABDUBFZMG/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2021:ADE5DAGFOP3CLE5HSABDUBFZMG","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":"2cd1cf0b21377a676b25e3aea9a7515bb9f18dea18035a226602174e5ae30a71","cross_cats_sorted":["cs.LG"],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"cs.IR","submitted_at":"2021-11-22T20:09:38Z","title_canon_sha256":"5760b351148414fb815d0f6c316f3cebda641d86a7a33b751ba9aaf6546fe221"},"schema_version":"1.0","source":{"id":"2111.11509","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2111.11509","created_at":"2026-07-05T03:34:55Z"},{"alias_kind":"arxiv_version","alias_value":"2111.11509v1","created_at":"2026-07-05T03:34:55Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2111.11509","created_at":"2026-07-05T03:34:55Z"},{"alias_kind":"pith_short_12","alias_value":"ADE5DAGFOP3C","created_at":"2026-07-05T03:34:55Z"},{"alias_kind":"pith_short_16","alias_value":"ADE5DAGFOP3CLE5H","created_at":"2026-07-05T03:34:55Z"},{"alias_kind":"pith_short_8","alias_value":"ADE5DAGF","created_at":"2026-07-05T03:34:55Z"}],"graph_snapshots":[{"event_id":"sha256:8a38bbdf87761f7f825086791f78202ab546017d7d07291addea0a7ac941ad68","target":"graph","created_at":"2026-07-05T03:34:55Z","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"},"integrity":{"available":true,"clean":true,"detectors_run":[],"endpoint":"/pith/2111.11509/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"Recommender systems have been widely used in different application domains including energy-preservation, e-commerce, healthcare, social media, etc. Such applications require the analysis and mining of massive amounts of various types of user data, including demographics, preferences, social interactions, etc. in order to develop accurate and precise recommender systems. Such datasets often include sensitive information, yet most recommender systems are focusing on the models' accuracy and ignore issues related to security and the users' privacy. Despite the efforts to overcome these problems ","authors_text":"Abbes Amira, Abdullah Alsalemi, Aya Sayed, Christos Sardianos, Faycal Bensaali, George Dimitrakopoulos, Iraklis Varlamis, Magdalini Eirinaki, Yassine Himeur","cross_cats":["cs.LG"],"headline":"","license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"cs.IR","submitted_at":"2021-11-22T20:09:38Z","title":"Blockchain-based Recommender Systems: Applications, Challenges and Future Opportunities"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2111.11509","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":"sha256:32bd2c92f09e5e53fd2f45dda6be053ccc1e7fe840908dfbc3f961fe55dc130c","target":"record","created_at":"2026-07-05T03:34:55Z","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":"2cd1cf0b21377a676b25e3aea9a7515bb9f18dea18035a226602174e5ae30a71","cross_cats_sorted":["cs.LG"],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"cs.IR","submitted_at":"2021-11-22T20:09:38Z","title_canon_sha256":"5760b351148414fb815d0f6c316f3cebda641d86a7a33b751ba9aaf6546fe221"},"schema_version":"1.0","source":{"id":"2111.11509","kind":"arxiv","version":1}},"canonical_sha256":"00c9d180c573f62593a790023a04b961b9ab10dc230158f3288fa1dcf8f8bae8","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"00c9d180c573f62593a790023a04b961b9ab10dc230158f3288fa1dcf8f8bae8","first_computed_at":"2026-07-05T03:34:55.021655Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T03:34:55.021655Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"7Hpl+z5zHAbgxtzFQ4qFrZCqJ1683BkNB55bBh5NOrSntNvl9iwWnfITCbXhUhOXDbiPcwJUp8dmezj3iye8BA==","signature_status":"signed_v1","signed_at":"2026-07-05T03:34:55.022139Z","signed_message":"canonical_sha256_bytes"},"source_id":"2111.11509","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:32bd2c92f09e5e53fd2f45dda6be053ccc1e7fe840908dfbc3f961fe55dc130c","sha256:8a38bbdf87761f7f825086791f78202ab546017d7d07291addea0a7ac941ad68"],"state_sha256":"c2e7bbea0b2095f4dc8b25fc8f79d7c7a14b717280a6b082d8c3619667f178af"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"Qbi5t1hhyHiEnrKJRv22pMacLA5XieWlBmOlN5EJ8XgfjAkTqXifMrAW3uX0gbJ7WZMaR4dV6kai5wFUoNNvAQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-07-05T15:44:29.173728Z","bundle_sha256":"f489eec4010be6dfa9670d7bb9017e0585dcb61ab64db5056dd09cae17bd614a"}}