Cryptocurrency can be explained a digital cash for the Internet. It works the same as any other currency, like Dollars, Pounds, Euros, etc. The main difference is that a cryptocurrency can only be spent digitally. You can send and receive cryptocurrency, but you would need to exchange it for USD to cash out. Just like you can receive British Pounds while in the US. But to spend it, you would need to exchange it for USD.
Bitcoin, Litecoin, Ethereum and Bitcoin Cash are popular cryptocurrencies that you can use to fund your Racing account.