Block chain technology makes possible the digital forms of money known as cryptocurrency, which enables transactions to be made without any physical forms of payment — coins, dollar bills, checks or credit cards, for instance. That makes many people and businesses hesitant to embrace digital currency. But some businesses and organizations are giving it a try. Fulton Schools Research Professor Dragan Boscovic, director of ASU Blockchain Research Lab, says the many different kinds of digital money — there are thousands — make it difficult for businesses to decide which kind to use, and that the inability of cryptocurrency to process large numbers of transactions quickly is a drawback. Boscovic still expects to see increasing use of digital currency, but doesn’t foresee it becoming mainstream any time soon.