Billionaire Frank Giustra, one of the world's most successful investors, has thrown his weight behind an unassuming Bitcoin stock focused on cryptocurrency mining called Hive Technologies.

Giustra is best known for his efforts to help build up Goldcorp Inc. and as the founder of Lions Gate Entertainment. And he's not alone. Frank Holmes, chief investment officer at U.S. Global Investors, is also invested in Hive and serves as chairman of the company.