Designing blockchain-based applications is a challenging task and requires a number of coordinated architecture decisions. To guide decision making in this regard, we systematically explore this architectural design space and possible solution strategies. More precisely, we provide architectural design decisions and decision options in terms of patterns and practices. Our research shows that most design decisions are influenced by the need to offset current blockchain drawbacks such as scalability, privacy, and usability by using centralized elements. This suggests that a hybrid architecture is beneficial in many design situations.

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