Overview: This book constitutes the thoroughly refereed post conference papers of the Second International Conference on Blockchain and Trustworthy Systems, Blocksys 2020, held in Dali, China*, in August 2020..The 42 full papers and the 11 short papers were carefully reviewed and selected from 100 submissions. The papers are organized in topical sections:?theories and algorithms for blockchain,?performance optimization of blockchain,?blockchain security and privacy,?blockchain and cloud computing,?blockchain and internet of things,?blockchain and mobile edge computing,?blockchain and smart con
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