Hackers who attack Wisconsin businesses want cryptocurrency as ransom You can't touch or see cryptocurrency. You don't deposit it in a bank. But digital currency can be used to buy, sell or invest. and last updated 2021-05-26 10:17:13-04 You can't touch or see cryptocurrency. You don't deposit it in a bank. But digital currency can be used to buy, sell or invest. Bitcoin, Ethereum, and thousands of other cryptocurrencies are the driving force behind a growing digital payment system. Even gas stations have dedicated machines turning your cash into virtual currency. "It's the popularity of the coins that make them rise in value," said cybersecurity expert with Brookfield's Sikich, Kevin Bong.