... launch a new regulated cryptocurrency exchange called RiotX in the U.S. by the end of 2019. The regulator published the documents on March 14.
source https://www.google.com/url?rct=j&sa=t&url=https://cointelegraph.com/news/riot-blockchain-plans-launch-of-regulated-cryptocurrency-exchange-in-the-us&ct=ga&cd=CAIyGmM2Nzk3ODA2ZWViNjVjODI6Y29tOmVuOlVT&usg=AFQjCNHz6FF88EEezPAKSjWK9OPjuJyqdw
