Advanced exchanges such as Kraken and GDAX will allow you to do what is called « pair trading ». Pair trading allows you to trade one fiat currency against one specific cryptocurrency, or cryptocurrency against cryptocurrency. For example, you might have an USD/BTC pair (exchange US Dollars for Bitcoin), or a GBP/ZEC pair (exchange British Pounds for Zcash), or even a BTC/LTC pair (Exchange Bitcoin for Litecoin). Bear in mind however that most exchanges which handle fiat currencies do not manage a lot of cryptocurrencies, only the mainstream ones.
A local financial regulator or competent monetary authority or institute is assigned the task of regulating the stock market of a country. The Securities and Exchange Commission (SEC) is the regulatory body charged with overseeing the U.S. stock markets. The SEC is a federal agency that works independently of the government and political pressure. The mission of the SEC is stated as: "to protect investors, maintain fair, orderly, and efficient markets, and facilitate capital formation."

What would make me sell: Sometimes there are good reasons to split up. For this part of your journal, compose an investing prenup that spells out what would drive you to sell the stock. We’re not talking about stock price movement, especially not short term, but fundamental changes to the business that affect its ability to grow over the long term. Some examples: The company loses a major customer, the CEO’s successor starts taking the business in a different direction, a major viable competitor emerges, or your investing thesis doesn’t pan out after a reasonable period of time.