Investing.com - Top U.S. cryptocurrency exchange Coinbase is opening a trading operation in Japan, the world's largest market for bitcoin.Coinbase, the largest exchange in the U.S., currently operates in 32 countries, but says it wants a greater presence in Asia.The company says the new exchange is part of a broader effort to accelerate the global adoption of cryptocurrencies. It's also Coinbase's latest move to expand its presence in the marketplace. Two weeks ago, Coinbase acquired Paradex, a peer-to-peer platform that offers trading in hundreds of digital coins. Earlier in May, Coinbase unveiled a group of new products aimed at attracting institutional investors.