Coinbase, the largest cryptocurrency trading platform in the US, is about to become a regulated broker-dealer, pending approval by SEC. Once the license is granted, Coinbase will be able to offer blockchain-based securities trading in compliance with US Securities and Exchange Commission (SEC) and the Financial Industry Regulatory Authority (FINRA) regulation. This step has become possible with the acquisition of Keystone Capital Corp., a Cardiff, Calif.-based financial-services firm. Keystone is a Finra-registered broker-dealer along with its licenses.