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Today, enterprise architects and IT systems developers must decide ad hoc how to identify, assess and mitigate ethical issues of autonomous, rule-based systems based on blockchain technology. As blockchain systems are decentralized and immutable, developers must assess ethical risks, not only on an individual and context-based level but on a network level and for all life-cycle stages of a blockchain system. Furthermore, these ethical issues should be addressed in a context of clearly defined values, as the developer otherwise risks encoding their own worldviews and values in the system. We have chosen the European Union as a use case for analysing the identified ethical risks of blockchain systems. This empirical work presents a top-down approach that establishes ethical guidelines for blockchain systems based on ethical issues mapped against European values.