Who owns digital assets? And how do you tax something that can't be controlled technically? With the rise of cryptocurrencies, Web3 protocols, and decentralized financial systems, a new understanding of ownership is emerging that fundamentally challenges the foundations of state order, economic models, and tax fairness. This book analyzes what it means when property is tokenized, ownership is regulated by smart contracts, and global value flows are anonymized. It shows how classic categories such as property, tax sovereignty, and financial supervision must be renegotiated in the digital space-and what risks, opportunities, and scope for action this entails. In a comprehensive and interdisciplinary presentation, the work combines technological, legal, economic, and social perspectives. Topics range from the tokenization of real assets and tax law challenges to the question of how states can remain capable of acting in a decentralized financial world. Bremen University Press has published over 5,000 specialist books in various languages since 2005. 1st edition 2025