Sitting in front of a packed auditorium in Dubai, a founder of the Trump family cryptocurrency business made a brief but monumental announcement on Thursday. A fund backed by Abu Dhabi, he said, would be making a $2 billion business deal using the Trump firm’s digital coins.

That transaction would be a major contribution by a foreign government to President Trump’s private venture — one that stands to generate hundreds of millions of dollars for the Trump family. And it is a public and vivid illustration of the ethical conflicts swirling around Mr. Trump’s crypto firm, which has blurred the boundary between business and government.

Zach Witkoff, a founder of the Trump family crypto firm, World Liberty Financial, revealed that a so-called stablecoin developed by the firm, would be used to complete the transaction between the state-backed Emirati investment firm MGX and Binance, the largest crypto exchange in the world.

Virtually every detail of Mr. Witkoff’s announcement, made during a conference panel with Mr. Trump’s second-eldest son contained a conflict of interest.

MGX’s use of the World Liberty stablecoin, USD1, brings a Trump family company into business with a venture firm backed by a foreign government. The deal creates a formal link between World Liberty and Binance — a company that has been under U.S. government oversight since 2023, when it admitted to violating federal money-laundering laws.

And the splashy announcement served as an advertisement to crypto investors worldwide about the potential for forming a partnership with a company tied to President Trump, who is listed as World Liberty’s chief crypto advocate.