Resumen: This paper proposes a novel extension of blockchain systems with fuzzy ontologies. The main advantage is to let the users have flexible restrictions, represented using fuzzy sets, and to develop smart contracts where there is a partial agreement among the involved parts. We propose a general architecture based on four fuzzy ontologies and a process to develop and run the smart contracts, based on a reduction to a well-known fuzzy ontology reasoning task (Best Satisfiability Degree). We also investigate different operators to compute Pareto-optimal solutions and implement our approach in the Ethereum blockchain. Idioma: Inglés DOI: 10.1109/FUZZ48607.2020.9177732 Año: 2020 Publicado en: Proceedings of ... IEEE International Conference on Fuzzy Systems 2020, 6 (2020), [8 pp] ISSN: 1098-7584 Factor impacto SCIMAGO: 0.28 - Applied Mathematics - Software - Artificial Intelligence