This book analyses the new blockchain and Distributed Ledger Technology (DLT) in term of its impact on law, contracts and the digital economy. It discusses global legislation in the blockchain and its implications. The analysis of contracts includes the Bitcoin system and the Bitcoin Blockchain. The book is written in an international and European perspective. It is characterised by a practical approach and addressed to lawyers who want to deepen their knowledge about legal aspects of new technologies such as the blockchain and other modern IT tools, but also to entrepreneurs, IT specialists, developers and IT managers in the implementation of DLT and block technologies