How can we optimize the governance of blockchains and financial crime at a time of global warming and the energy crisis? How can we find sustainable, inclusive and ethical solutions that respect human rights? The first part of this series looks at the dynamics and regulation of blockchains. Emerging as a combination of older technologies, forming the protocol underlying bitcoin, blockchains enable decentralized and secure exchanges, without the need for a trusted third party. The prospects opened up by these technologies are considerable. In this respect, the author argues for the development of blockchains which, while not sovereign, would be designed with respect for philosophical and moral principles. The second part of the volume addresses the issue of decision-making in financial crime in the age of the digital economy, particularly in the fight against tax fraud and evasion. This volume takes stock of the mechanisms in place to prevent, deter and punish tax fraud and evasion, while proposing adjustments to ensure that these mechanisms are fully applied and effective.