It was in 2017.

Brothers Tyler and Cameron Winklevoss became the first billionaires whose fortune was secured by investments in bitcoin. In 2013, they purchased 1% of the world's bitcoin stock for $11 million, when the exchange rate was $120. By early December 2017, when the exchange rate reached about $11,600, their capital exceeded $1 billion. This point is considered important for bitcoin, showing its importance as an active investment tool.

The Winklevoss brothers are known not only for their investments in bitcoin, but also for their disputes with Facebook founder Mark Zuckerberg. They accused him of stealing their idea, but subsequently reached a settlement agreement. It is assumed that they used the money received from Zuckerberg to buy bitcoins.

The Winklevoss brothers have never sold their bitcoins, they believe in the long-term return on their investments. In an interview, Tyler called bitcoin "an improved version of gold." They also opened their own online exchange and venture fund.

In addition to the Winklevoss, another owner of bitcoins worth more than $ 1 billion is the founder of bitcoin, known under the pseudonym Satoshi Nakamoto.