To start a new section, hold down the apple+shift keys and click to release this object and type the section title in the box below. Contents Foreword 1 Introduction 2 What is a blockchain? 4 The Internet of Value-Exchange 8 Key challenges 10 From vision to reality 13 Endnotes 14 Contacts 18 Acknowledgements The authors would like to acknowledge the support they have received from a number of people in Deloitte while researching this publication, including Ross Laurie, Jemma Insall, Ankur Borthakur and Aleksandra Szwiling. We would also like to thank the authors of “Bitcoin: Fact. Fiction. Future”, published by Deloitte University Press, for permission to reuse figures and text from their report, and the authors of “Cleared for takeoff: Five megatrends that will change financial services”, researched and written in collaboration with the World Economic Forum, and “Beyond bitcoin: Blockchain is coming to disrupt your industry”, for their invaluable insights into blockchain technology. In this publication, references to Deloitte are references to Deloitte LLP, the UK member firm of DTTL.

Blockchains: Enigma. Paradox. Opportunity. - Page 2 Blockchains: Enigma. Paradox. Opportunity. Page 1 Page 3