AdvertisementA big fight is brewing over cryptocurrencies. These are some key players to watch03:55Download AudioResumeNovember 06, 2021David GurafacebookEmailFrom left to right: Sen. Cynthia Lummis, R-Wyoming; Securities and Exchange Commission Chairman Gary Gensler; and Sen. Elizabeth Warren, D-Mass. All three are likely to play important roles as the country starts to shape regulations for cryptocurrencies such as Bitcoin. (Various)