Goldman Sachs CEO David Solomon said Wednesday "it is very, very important that we codify a rule-based system" for how cryptocurrency and related financial instruments will operate" in the United States."As an American, I think it is very important that as we put legislation in place, we get it right for the long term," Solomon told CNBC's Sara Eisen during an interview in front of attendees at the World Liberty Forum at the Mar-a-Lago club in Palm Beach, Fla., which was hosted by the Trump family's crypto ...