{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2016:J7NDHU3IWN36P536NI3BB3PJPI","short_pith_number":"pith:J7NDHU3I","canonical_record":{"source":{"id":"1609.02451","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.IR","submitted_at":"2016-09-08T14:57:25Z","cross_cats_sorted":[],"title_canon_sha256":"f60f278aa55fd3697eb7d6c1d1cb21bbf25ac079b8b50d9a3d491b449108355d","abstract_canon_sha256":"193067581de2f4a566cbfb9a555dcef4c5a5707fede3d2dfb6dafe7b489cea4a"},"schema_version":"1.0"},"canonical_sha256":"4fda33d368b377e7f77e6a3610ede97a2f3dd9cfd5331079bbc80e8b976ca60c","source":{"kind":"arxiv","id":"1609.02451","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1609.02451","created_at":"2026-05-18T01:04:42Z"},{"alias_kind":"arxiv_version","alias_value":"1609.02451v2","created_at":"2026-05-18T01:04:42Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1609.02451","created_at":"2026-05-18T01:04:42Z"},{"alias_kind":"pith_short_12","alias_value":"J7NDHU3IWN36","created_at":"2026-05-18T12:30:22Z"},{"alias_kind":"pith_short_16","alias_value":"J7NDHU3IWN36P536","created_at":"2026-05-18T12:30:22Z"},{"alias_kind":"pith_short_8","alias_value":"J7NDHU3I","created_at":"2026-05-18T12:30:22Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2016:J7NDHU3IWN36P536NI3BB3PJPI","target":"record","payload":{"canonical_record":{"source":{"id":"1609.02451","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.IR","submitted_at":"2016-09-08T14:57:25Z","cross_cats_sorted":[],"title_canon_sha256":"f60f278aa55fd3697eb7d6c1d1cb21bbf25ac079b8b50d9a3d491b449108355d","abstract_canon_sha256":"193067581de2f4a566cbfb9a555dcef4c5a5707fede3d2dfb6dafe7b489cea4a"},"schema_version":"1.0"},"canonical_sha256":"4fda33d368b377e7f77e6a3610ede97a2f3dd9cfd5331079bbc80e8b976ca60c","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:04:42.892795Z","signature_b64":"CjNOBGllUcuzuhKmhHd7t6nrP+K2R0a2Rb75W206pvnfbV4B0CX71mMSXPh13BRuDg30N8GSHauhYfF28IaTAg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"4fda33d368b377e7f77e6a3610ede97a2f3dd9cfd5331079bbc80e8b976ca60c","last_reissued_at":"2026-05-18T01:04:42.892150Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:04:42.892150Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1609.02451","source_version":2,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T01:04:42Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"4ji6Ygf5xPIwemOQxjasee8TZMA36IvohQX5P79fyOkvVOhxzSt7Qh6/jNXnYbBtla291Mnhq1R+Ae2ty3U+Aw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-30T23:35:48.250717Z"},"content_sha256":"97520b717c0bd9ea8e8c5654cc950ec620ed282c3df73930e297644d82ca44d8","schema_version":"1.0","event_id":"sha256:97520b717c0bd9ea8e8c5654cc950ec620ed282c3df73930e297644d82ca44d8"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2016:J7NDHU3IWN36P536NI3BB3PJPI","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"A Flexible Recommendation System for Cable TV","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"cs.IR","authors_text":"Diogo Goncalves, Francisco M. Couto, Miguel Costa","submitted_at":"2016-09-08T14:57:25Z","abstract_excerpt":"Recommendation systems are being explored by Cable TV operators to improve user satisfaction with services, such as Live TV and Video on Demand (VOD) services. More recently, Catch-up TV has been introduced, allowing users to watch recent broadcast content whenever they want to. These services give users a large set of options from which they can choose from, creating an information overflow problem. Thus, recommendation systems arise as essential tools to solve this problem by helping users in their selection, which increases not only user satisfaction but also user engagement and content con"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1609.02451","kind":"arxiv","version":2},"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":"2026-05-18T01:04:42Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"OWrir67rHz0IIzm9z2nlvg5jPLHFXy6tOZ0kvbp3CrCVaVSlh2KSznDGI2rkSF7HMwmCixucUalXBcR2jV4EDg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-30T23:35:48.251069Z"},"content_sha256":"01c454ee824c4a3612db42a4b310cc4ace0ea82d300f1883cfea383b51257d5d","schema_version":"1.0","event_id":"sha256:01c454ee824c4a3612db42a4b310cc4ace0ea82d300f1883cfea383b51257d5d"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/J7NDHU3IWN36P536NI3BB3PJPI/bundle.json","state_url":"https://pith.science/pith/J7NDHU3IWN36P536NI3BB3PJPI/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/J7NDHU3IWN36P536NI3BB3PJPI/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":"2026-05-30T23:35:48Z","links":{"resolver":"https://pith.science/pith/J7NDHU3IWN36P536NI3BB3PJPI","bundle":"https://pith.science/pith/J7NDHU3IWN36P536NI3BB3PJPI/bundle.json","state":"https://pith.science/pith/J7NDHU3IWN36P536NI3BB3PJPI/state.json","well_known_bundle":"https://pith.science/.well-known/pith/J7NDHU3IWN36P536NI3BB3PJPI/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2016:J7NDHU3IWN36P536NI3BB3PJPI","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":"193067581de2f4a566cbfb9a555dcef4c5a5707fede3d2dfb6dafe7b489cea4a","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.IR","submitted_at":"2016-09-08T14:57:25Z","title_canon_sha256":"f60f278aa55fd3697eb7d6c1d1cb21bbf25ac079b8b50d9a3d491b449108355d"},"schema_version":"1.0","source":{"id":"1609.02451","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1609.02451","created_at":"2026-05-18T01:04:42Z"},{"alias_kind":"arxiv_version","alias_value":"1609.02451v2","created_at":"2026-05-18T01:04:42Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1609.02451","created_at":"2026-05-18T01:04:42Z"},{"alias_kind":"pith_short_12","alias_value":"J7NDHU3IWN36","created_at":"2026-05-18T12:30:22Z"},{"alias_kind":"pith_short_16","alias_value":"J7NDHU3IWN36P536","created_at":"2026-05-18T12:30:22Z"},{"alias_kind":"pith_short_8","alias_value":"J7NDHU3I","created_at":"2026-05-18T12:30:22Z"}],"graph_snapshots":[{"event_id":"sha256:01c454ee824c4a3612db42a4b310cc4ace0ea82d300f1883cfea383b51257d5d","target":"graph","created_at":"2026-05-18T01:04:42Z","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":"Recommendation systems are being explored by Cable TV operators to improve user satisfaction with services, such as Live TV and Video on Demand (VOD) services. More recently, Catch-up TV has been introduced, allowing users to watch recent broadcast content whenever they want to. These services give users a large set of options from which they can choose from, creating an information overflow problem. Thus, recommendation systems arise as essential tools to solve this problem by helping users in their selection, which increases not only user satisfaction but also user engagement and content con","authors_text":"Diogo Goncalves, Francisco M. Couto, Miguel Costa","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.IR","submitted_at":"2016-09-08T14:57:25Z","title":"A Flexible Recommendation System for Cable TV"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1609.02451","kind":"arxiv","version":2},"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":"sha256:97520b717c0bd9ea8e8c5654cc950ec620ed282c3df73930e297644d82ca44d8","target":"record","created_at":"2026-05-18T01:04:42Z","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":"193067581de2f4a566cbfb9a555dcef4c5a5707fede3d2dfb6dafe7b489cea4a","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.IR","submitted_at":"2016-09-08T14:57:25Z","title_canon_sha256":"f60f278aa55fd3697eb7d6c1d1cb21bbf25ac079b8b50d9a3d491b449108355d"},"schema_version":"1.0","source":{"id":"1609.02451","kind":"arxiv","version":2}},"canonical_sha256":"4fda33d368b377e7f77e6a3610ede97a2f3dd9cfd5331079bbc80e8b976ca60c","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"4fda33d368b377e7f77e6a3610ede97a2f3dd9cfd5331079bbc80e8b976ca60c","first_computed_at":"2026-05-18T01:04:42.892150Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:04:42.892150Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"CjNOBGllUcuzuhKmhHd7t6nrP+K2R0a2Rb75W206pvnfbV4B0CX71mMSXPh13BRuDg30N8GSHauhYfF28IaTAg==","signature_status":"signed_v1","signed_at":"2026-05-18T01:04:42.892795Z","signed_message":"canonical_sha256_bytes"},"source_id":"1609.02451","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:97520b717c0bd9ea8e8c5654cc950ec620ed282c3df73930e297644d82ca44d8","sha256:01c454ee824c4a3612db42a4b310cc4ace0ea82d300f1883cfea383b51257d5d"],"state_sha256":"81124d3e276af1d2d786de7c7e3f52e5bd0b24e4151d78995dc54666c8e8a778"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"jHcZ/gN9zYQZZpOxFAb9brY2A6ZuYb+TJdSDOcFnkrkNKAe3iwvmvX4XYE6l55MJMTHEQHYAqsBJ8vh4qmRkCg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-30T23:35:48.253114Z","bundle_sha256":"60bea44460b0be66c692f0d3e05e92aded5cf979f4a0ecf32f791a250c5fee6b"}}