Blockchains have the potential to help address trust gaps that currently exist between citizens and governments. By providing immutable, transparent records of transactions and information, blockchains could reduce costs, time, and risks associated with intermediaries, while boosting trust. However, regulators face challenges in developing strategies for how to govern blockchain technologies, including whether to regulate users, producers, or miners, and determining the appropriate level of decentralization versus security. Shifting to a more collaborative, post-facto regulatory approach that promotes innovation could help governments integrate blockchains while addressing concerns over issues like energy use and reversibility of transactions.