Somewhat regrettably given the connotations also associated, cryptocurrency. In countries where there are legal, regulated exchanges, this pretty much meets the requirements there.
Why regrettably? Also, crypto doesn't mandate anonymity if you go by the original Satoshi whitepaper. You'll have to specifically recommend an anonymous ecosystem like Monero. And at that point, it's like regrettably mentioning American dollars because the Ruble has bad connotations.