US President Donald Trump signed an executive order Thursday for establishing a "Strategic Bitcoin Reserve," forcefully endorsing a currency once shunned as a tool for money launderers. The government stockpile, which backers liken to a "digital Fort Knox," will be composed of digital currency seized in US criminal proceedings, said David Sacks, the White House's crypto "czar," emphasizing in a social media post that Thursday's move made good on a Trump campaign promise. The use of these assets "means it will not cost taxpayers a dime," Sacks said in a post on X. "The purpose of the Stockpile is responsible stewardship of the government's digital assets under the Treasury Department."