'Nabben reveals the secrets of keeping decentralised technologies like cryptocurrencies secure against widespread and fast-changing threats - and what all of us can learn from their victories and failures. Smart, clear and rich in detail and insider knowledge, this is essential reading for anyone who wants to understand digital security now.' - Professor Finn Brunton, author of Digital Cash 'It has been a privilege to welcome Dr Kelsie Nabben as a member of the BlockchainGov research team during her Max Weber Fellowship at the European University Institute. Kelsie's book is a timely and important contribution to the study of blockchain governance. Drawing from conversations on the legitimacy, polycentricity, and resilience of blockchain networks, she employs ethnographic methods to investigate how security is actually produced in these networks. Her book illustrates how blockchain governance is a product of informal norms, structured coalitions, and negotiated interventions that sit at the intersection of technical architecture and social organisation. This book is an essential read for scholars, practitioners, and regulators seeking to understand the evolving architecture of digital trust.' - Dr Primavera De Filippi, author of Blockchain & The Law 'The security of the Ethereum ecosystem does not rely on a single authority, but rather vast distributed expertise.

This book provides an account of how decentralized communities in the Ethereum ecosystem coordinate, respond to crises, and improve security practices. I am proud to have been part of supporting its publication which helps broaden understanding of these efforts and shape the next generation of security experts.' - Fredrik Svantes, Protocol Security Lead, Ethereum Foundation.