From: Finance Magnates
Relevant activities include mining and acceptance of cryptocurrency from customers.
The Financial Industry Regulatory Authority, a self-regulatory body of the American financial industry that is subordinate to the Securities and Exchange Commission, has published a notice encouraging its member firms to notify it if they engage in or intend to engage in any activities related to cryptocurrency.
FINRA regulates trading in financial derivatives such as securities, futures, options, and so on. Finance companies in the US are required to be regulated; FINRA is one of the options.