The growth of Blockchain technology presents a number of legal questions for lawyers, regulators and industry participants alike. This book identifies the legal challenges posed by cryptocurrencies, smart contracts and other applications of Blockchain, questioning whether these challenges can be addressed within the current legal system, or whether significant changes are required. Chapters assess how Blockchain's many applications will affect different areas of law, including contract, criminal, financial and private international law. Contributors analyse how these fields of law may need to adapt to accommodate Blockchain technology, proposing possible solutions and ways forward. Several chapters are based on the Swiss legal framework as it allows market participants the widest freedom to operate in Blockchains and cryptocurrencies. Overall, this illuminating work highlights the importance of creating a regulatory structure that will allow Blockchain technologies to develop, whilst also ensuring they are not abused. The conclusions of this book are however quite reassuring, with contributing authors suggesting that although disruptive, the challenges brought about by the 'Blockchain revolution' can, for the most part, be effectively addressed within the law as we know it. This book will be a valuable resource for practising lawyers and academic researchers who are interested in understanding more about how legal and regulatory systems will be affected by the implementation of Blockchain technologies. Contributors include: A. Alberini, V. Botteron, C. Boulay, N. Capus, B. Carron, P. Delimatsis, F. Guillaume, O. Hari, B. Homsy, D. Kraus, M. Le Boudec, V. Mignon, T. Obrist, V. Pfammatter, R.A. Pfister, V. Salomon, P. Witzig