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Our contribution relies on chained historical data to improve the quality and transparency of online collaborative recommendation filters\u00a0\u2013 Memory-based and Model-based\u00a0\u2013 using, as use cases, data streamed from two large tourism crowdsourcing platforms, namely Expedia and TripAdvisor. Building historical trust-based models of raters, our method is implemented as an external module and integrated with the collaborative filter through a post-recommendation component. The inter-user trust profiling history, traceability and authenticity are ensured by blockchain, since these profiles are stored as a smart contract in a private Ethereum network. Our empirical evaluation with HotelExpedia and Tripadvisor has consistently shown the positive impact of blockchain-based profiling on the quality (measured as recall) and transparency (determined via explanations) of recommendations.<\/jats:p>","DOI":"10.3233\/ica-210668","type":"journal-article","created":{"date-parts":[[2021,10,2]],"date-time":"2021-10-02T01:43:34Z","timestamp":1633139014000},"page":"105-121","source":"Crossref","is-referenced-by-count":10,"title":["Stream-based explainable recommendations via blockchain profiling"],"prefix":"10.1177","volume":"29","author":[{"given":"F\u00e1tima","family":"Leal","sequence":"first","affiliation":[{"name":"Universidade Portucalense, Porto, Portugal"},{"name":"National College of Ireland, Dublin, Ireland"}]},{"given":"Bruno","family":"Veloso","sequence":"additional","affiliation":[{"name":"Universidade Portucalense, Porto, Portugal"},{"name":"INESC TEC, Porto, Portugal"}]},{"given":"Benedita","family":"Malheiro","sequence":"additional","affiliation":[{"name":"INESC TEC, Porto, Portugal"},{"name":"Polytechnic of Porto, Porto, Portugal"}]},{"given":"Juan C.","family":"Burguillo","sequence":"additional","affiliation":[{"name":"University of Vigo, Vigo, Spain"}]},{"given":"Adriana E.","family":"Chis","sequence":"additional","affiliation":[{"name":"National College of Ireland, Dublin, Ireland"}]},{"given":"Horacio","family":"Gonz\u00e1lez-V\u00e9lez","sequence":"additional","affiliation":[{"name":"National College of Ireland, Dublin, Ireland"}]}],"member":"179","reference":[{"issue":"4","key":"10.3233\/ICA-210668_ref1","doi-asserted-by":"crossref","first-page":"351","DOI":"10.3233\/ICA-2008-15406","article-title":"Ontology-based inference for causal explanation","volume":"15","author":"Besnard","year":"2008","journal-title":"Integrated Computer-Aided Engineering"},{"key":"10.3233\/ICA-210668_ref2","first-page":"479","article-title":"Explaining recommendations: Design and evaluation","author":"Tintarev","year":"2015","journal-title":"Recommender systems handbook. 2nd ed"},{"issue":"1","key":"10.3233\/ICA-210668_ref3","doi-asserted-by":"crossref","first-page":"1","DOI":"10.1561\/1500000066","article-title":"Explainable recommendation: A survey and new perspectives","volume":"14","author":"Zhang","year":"2020","journal-title":"Foundations and Trends\u00a9 in Information Retrieval"},{"key":"10.3233\/ICA-210668_ref4","first-page":"361","article-title":"Real-time recommendation of streamed data","author":"Hopfgartner","year":"2015","journal-title":"RecSys\u201915. 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