There are no bitcoin ETFs for US investors (yet), though Goldman Sachs and Fidelity have filed with the SEC. The closest you can get is the Grayscale Bitcoin Trust (GBTC). It's not technically an ETF and has notable downsides, but its the largest fund out there. It is currently trading at a negative premium relative to the NAV which IMO makes it a great buy (I have a significant portion in my IRA).
thx.
what are the notable downsides?
The most significant one is that it has a 2%APY fee (which accrues daily). Because it is a trust, you cannot actually exchange your shares for bitcoin, but the trust is also prevented from selling any assets except to cover expenses. There is a threat of competition of ETFs being approved which will take market share from GBTC, though they will likely drop fees and/or convert to an ETF if and when that happens. Currently GBTC is trading at a NAV discount because of these issues.
When you own GBTC, you do not actually control the private keys. To those that just want exposure to the asset, this may actually be a benefit since you do not have to take on the responsibility of managing the keys yourself. Grayscale has excellent security and can probably do a better job than just about any private individual, but ultimately you are relying on a 3rd party to secure your assets - which may be an advantage or disadvantage depending on your disposition.
