This document discusses the need for a multistakeholder approach to governing blockchain technology and cryptocurrencies. It identifies various stakeholders in the blockchain ecosystem like innovators, investors, developers and regulators. It proposes that like the Internet, blockchain requires cooperation across stakeholders and sectors. The document outlines challenges around stewardship of blockchain platforms, applications and the overall ecosystem. It advocates forming networked institutions, standards bodies, advocacy groups, and knowledge networks to help blockchain reach its full potential.