Digital currency, especially Bitcoin, picked up in popularity this year as the concept began garnering positive attention from payment players — but a series of negative incidents kept the skepticism alive as well.

"Digital currencies still have not been totally accepted by the payments space," says Jon Holmquist, head of marketing at Coinabul, a company that exchanges bitcoins for silver or gold. "The industry is a little hesitant to move off of the rails of the banking system and onto new unsteady currencies."

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