On the opening day of Messari’s Mainnet conference in New York City Monday morning, rumors swirled that the United States Securities and Exchange Commission had entered the Marriott Marquis and served a panel speaker — possibly a foreign national — with a subpoena. The talk was sparked by a Tweet from an attendee, Indiegogo founder Slava Rubin, claiming he saw SEC officials serve the panelist moments before taking the stage. Rubin did not respond to Blockworks’ request for comment. “I should give you a preface that we do not know who was served yet, and to the extent that it’s a client of ours, we’re going to not ... (full story)