One of the hottest topics of 2017 was cryptocurrencies. The blockchain-derived digital currencies such as Bitcoin, Ethereum, and Ripple were the subject of seemingly endless interest and speculation, in both the media and the markets. In an excitement reminiscent to many of the dot-com boom, cryptocurrency companies rushed to become issuers via initial coin offerings (ICOs). Companies that were previously unrelated to blockchain or any product of the technology changed their names or indeed their entire operational purposes to attract market interest. Investors searched for information and guidance, experimented with the digital currency as both a payment service and a securities holding, and filled social media and dinner table conversation with curiosity and enthusiasm for the disruptive potential cryptocurrencies hold for banking, technology, and the markets.