Bitcoin is a form of digital currency, created and held electronically. RockItCoin kiosks allow customers to purchase or sell a variety of cryptocurrencies, including bitcoin, bitcoin cash, litecoin, and etherium. General Business. More Americans Choosing Bitcoin ATMs Despite Regulations Despite the higher fees associated with buying or selling Bitcoin via specialized Bitcoin ATMs, quicker and more reliable delivery have seen rising popularity for the machines in the United States, even as ATM networks struggle to expand within strict regulations in the country.