U.S. President Donald Trump holds a signed executive order on cryptocurrencies in the Oval Office of the White House, in Washington, U.S., January 23, 2025. REUTERS/Kevin LamarqueKevin Lamarque | ReutersPresident Donald Trump signed an executive order on Thursday to promote the advancement of cryptocurrencies in the U.S. and to work towards potentially developing a national digital asset stockpile.Venture capitalist David Sacks, who Trump tapped as his crypto and artificial intelligence czar, jo...