This book presents a new, innovative cloud federation solution called Federation-as-a-Service (FaaS) and its software platform, SUNFISH. The authors explain the various engineering innovations involved, with a particular emphasis on the architectural level, and the contributions examine state-of-the-art state cloud technologies and advanced blockchain-empowered solutions for enhanced security and reliability.The book will be of value to public sector solution providers, public sector decision-makers, cloud computing technologists, and those engaged with blockchain technology.