Billionaires Tyler, left, and Cameron Winklevoss are believed to be two of the largest holders of Bitcoin, which they started buying when it was less than $10. Victor Besa / The National
Billionaires Tyler, left, and Cameron Winklevoss are believed to be two of the largest holders of Bitcoin, which they started buying when it was less than $10. Victor Besa / The National

Winklevoss twins: 'Bitcoin will reach $500,000'