The Chief Executive of Twitter, Jack Dorsey, said in an interview that he is certain that Bitcoin will be the only currency used throughout the world in 10 years at most.

Jack Dorsey was in London this week, where he promoted the services of the other company he runs, Square, which offers financial services focused on payment software and hardware.

The trust Dorsey puts in Bitcoin also comes from services offered by Square, a company that has recently added the option of buying and selling with Bitcoin straight from the app.

Dorsey admitted that he owns Bitcoin, but did not disclose the exact amount.