Just before being inaugurated as US president for the second time, Donald Trump launched something called a “meme-coin”.This is a bespoke cryptocurrency token featuring a picture of Donald Trump. A billion of them may eventually be created.

Newspaper headlines claimed that the Trump meme-coin had made the president billions of dollars wealthier. But it is far from clear that this is the case.Presenter: Charlotte McDonaldProducer: Lizzy McNeillSeries producer: Tom CollsProduction co-ordinator: Brenda BrownSound mix: Mike Etherden Editor: Richard Vadon