Who are the Big 4 brokers?
Excuse me, could you please elaborate on the term "Big 4 brokers" in the context of cryptocurrency and finance? Are they referring to the four largest or most influential brokerage firms in the industry? If so, what are their names, and what sets them apart from other players in the market? Are they known for their innovative technology, robust security measures, or perhaps their extensive network of clients and partners? I'm quite curious to learn more about these companies and their role in shaping the future of the cryptocurrency and finance landscape.