Investing.com - Top cryptocurrency exchange Coinbase has acquired a traditional securities firm in a bid to become a broker-dealer regulated by federal regulators.Coinbase, the largest crypto exchange in the U.S., says it bought Keystone Capital for an undisclosed price.If approved, the acquisition will allow Coinbase to offer a broad range of blockchain-based securities, including tokens, as well as traditional equities under the supervision of the Securities and Exchange Commission.Coinbase currently offers crypto trading in 32 countries and has 20 million users. It just announced plans to offer trading in Japan, one of several recent moves to grab a larger share of the cryptocurrency market. It also acquired peer-to-peer trading platform Paradex and launched a group of new products catering to institutional investors.