The Securities and Exchange Commission is investigating registered investment advisers to see if they are following rules regarding client crypto asset custody, according to three sources with knowledge of the matter. For several months, the SEC has been questioning advisers’ efforts to follow the agency’s rules regarding custody of clients’ digital assets, but the investigation has accelerated in the aftermath of the collapse of crypto exchange FTX, according to sources. They spoke on the condition of anonymity because the investigations are not public.