»Blockchain-Based Digital Assets in Enforcement and Bankruptcy«: The thesis elaborates efficient and feasible solutions for individual and collective enforcement of blockchain-based cryptocurrencies. Considering the economic analysis of the law, a possessory-based approach is formed and proven to be the only one that leads to workable solutions within the German enforcement and insolvency law. Within German insolvency law, systematic gaps are found and taken as an opportunity to develop a solution de lege feranda.