Blockchains are the distributed ledger technology that powers Bitcoin and other cryptocurrencies. But blockchains can be used for more than the transfer of tokens – they are a significant new economic infrastructure. This book offers the first scholarly analysis of the economic nature of blockchains and the shape of the blockchain economy. By applying the institutional economics of Ronald Coase and Oliver Williamson, this book shows how blockchains are poised to reshape the nature of firms, governments, markets, and civil society.