Typically, ETFs will track a particular index, sector, commodity or other assets, but unlike mutual funds, ETFs can be purchased or sold on a stock exchange the same way that a regular stock can. An ETF can be structured to track anything from the price of an individual commodity to a large and diverse collection of securities, per Investopedia. A spot bitcoin ETF, which is simply an exchange-traded fund that tracks the price of bitcoin, opens the door for, in this case, bitcoin investing without having to manage a crypto account or crypto wallet. A move by investment giant BlackRock is powering up the hype around bitcoin ETFs after financial services provider Depository Trust and Clearing Corporation posted BlackRock's spot bitcoin ETF on an eligibility list, even though the fund is still awaiting approval by the U.S. Securities and Exchange Commission. And some investors are seeing the move as a sign that SEC approval could be forthcoming.