AUTHOR=Clack Christopher D. TITLE=A Blockchain Grand Challenge: Smart Financial Derivatives JOURNAL=Frontiers in Blockchain VOLUME=1 YEAR=2018 URL=https://www.frontiersin.org/journals/blockchain/articles/10.3389/fbloc.2018.00001 DOI=10.3389/fbloc.2018.00001 ISSN=2624-7852