I have not talked with these guys yet, but you might check into it. You could transfer an existing IRA or rollover a 401k (if it's from a former employer) into this bitcoin ira. I assume this is structured as a self-directed ira custodian to allow bitcoin investing. I use SDIRAs to invest in international real estate. They have much more freedom on possible investments.

https://bitcoinira.com/buy-bitcoins/?AID=701&cID=3388&keyword=bitcoin%20ira&placement=&gclid=CjwKEAjw4IjKBRDr6p752cCUm3kSJAC-eqRtX-nvvzBrL6M2amdljpzukhSrKFhM1RtX31nwQpKxBhoCj5Lw_wcB