An unidentified man held up a sign saying "buy bitcoin" during Fed Chair Janet Yellen's testimony Wednesday before the House Financial Services Committee. Bitcoin subsequently climbed toward session highs and traded 3.7 percent higher, at $2,418.46, as of 2:27 p.m. ET, according to CoinDesk. The unidentified bitcoin proponent, whose stunt was visible on television, was removed from the hearing room. Holding up the sign violates the House committee's rules. Committee staffers told CNBC they didn't know who the man's name. (full story)