When you have an IRA, you can only withdraw money by telling the custodian that you are doing so, and they file 1099-R with the IRS. You may owe taxes or penalties - but all your withdrawals go through the custodian.
Note that I am not a lawyer - and most lawyers won't know the rules around this, either.
A very high risk approach is to setup a "self-directed IRA", and then form an entirely new LLC with the IRA's assets. If you mix this LLC's money with your own at all, from that moment forward the IRA is stripped of it's status and the entire balance becomes a withdrawal. That's the high risk - suddenly owing tax on everything in the IRA because of a "prohibited transaction" between the LLC and you or certain people related to you.
On the benefit side, your IRA's investment forms this new LLC, and that money goes into a bank account owned by the LLC ("Your Company FBO Some Poster IRA" or something like it). With that bank account, you can open an account on a crypto exchange (again, for the LLC) and fund the account from the LLC. If you screw up and put your name on the account, or you accidentally pay a fee with your credit card - you can strip the IRA of it's status and have a 100% withdrawal. But if you are careful to act only as the manager of this LLC, and not mix finances, you can save on crypto fees at an exchange.
If you like details, this might work. If you like learning all the details of what can go wrong with a self-directed IRA, maybe it's worth exploring. But someone who doesn't like details and tries this approach is far more likely to get burned badly - the IRS can force you to withdraw the entire Jan 1 balance of the IRA, and then pay taxes and penalties.
I'm currently halfway through a book about self-directed IRAs. It mostly discusses what can go wrong, and I'm glad I bought it. The author is part of "IRA Financial" that I mentioned in my prior post. You can search "foremost authority self-directed IRAs" and you'll find him.