For many years, investors could buy Bitcoin (CRYPTO: BTC) only through dedicated cryptocurrency exchanges. They could also invest in exchange-traded funds (ETFs) that were tethered to future contracts or Bitcoin trusts, but the former didn't always closely track Bitcoin's spot price, while the latter charged high expense fees.

That all changed this January when the U.S. Securities and Exchange Commission (SEC) approved 11 spot price Bitcoin ETFs, making it easier for retail and institutional investors to invest in the world's top cryptocurrency. Today, the top five spot price Bitcoin ETFs have a combined $56.5 billion in assets under management (AUM).

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Source Fool.com