Investing.com - Mobile payments company Square (NYSE:SQ) has said it is looking at more ways to integrate bitcoin into its business. One Wall Street firm may have an idea.Nomura Instinet surveyed 100 U.S. merchants using Square's platform and found that 60% of them were willing to accept bitcoin as payment. The merchants all have at least $100,000 in annual revenue.Square already allows users to buy and sell bitcoin on its Cash app, which is now used by about 7 million people. Square's co-founder and CEO Jack Dorsey believes Bitcoin is a "transformational technology" and sees it as a "step in the long-term path toward greater financial access for all."Square's stock is up about 50% in 2018.