The Trump family notched as much as $5 billion in paper wealth on Monday after its flagship crypto venture opened trading of a new digital currency.

The launch is akin to an initial public offering, in which the cryptocurrency, called WLFI, can now be bought and sold on the open market like a listed company’s shares. Beforehand, people who had privately bought WLFI from the Trump venture, World Liberty Financial, hadn’t been able to exchange their tokens.