This book constitutes the refereed proceedings of the First International Conference on Blockchain, ICBC 2018, held as part of the Services Conference Federation, SCF 2018, in Seattle, USA, in June 2018. The 16 full papers and 7 short papers presented were carefully reviewed and selected from 36 submissions. The papers cover a wide range of topics in blockchain technologies, platforms, solutions and business models such as new blockchain architecture, platform constructions, blockchain development and blockchain services technologies as well as standards, and blockchain services innovation lifecycle including enterprise modeling, business consulting, solution creation, services orchestration, services optimization, services management, services marketing, business process integration and management.