Retirement accounts are a great place to purchase crypto, either pre-tax (on Uncle Sam's dime) or with Roth money for completely tax-free growth.
But the way to do it is with checkbook-control IRA-LLC or Checkbook Solo 401K. I got into this with a company called ReSure Financial. Their IRA and 401K platform is at https://www.401kcheckbook.com/.

They're not the only ones so do you research. The approach costs a whole lot less than using a designated BitcoinIRA. Plan to write a post about this, but it definitely is the way to go.