"You must keep the gift in the form that you choose, and you can't touch it for 10 years," Paul said in a tweet Tuesday.
Their answer? Bitcoin.
While Paul hasn't been particularly vocal on cryptocurrencies, the former politician has promoted a retirement fund that lets users invest digital tokens including bitcoin and Ethereum into an individual retirement account.
Experts believe more institutional traders could start to warm to bitcoin as derivatives like futures and ETFs (exchange-traded funds) become the talk of Wall Street.