The blockchain accounts that hold bitcoin, the first and most famous cryptocurrency, are anonymous, so it is impossible to identify most of the nearly 900 bitcoin millionaires around the world. Data from the BitcoinRichList, a website that tracks all bitcoin accounts, suggests that, as of August 2016, the top 100 bitcoin addresses owned approximately 20% of all bitcoins. There were 16 separate bitcoin addresses worth more than $30 million. The top five addresses owned roughly 510,000 bitcoins worth $292 million.

The only way to identify the owners of these hefty balances is through self-disclosure. It is not feasible to confidently list the top five wealthiest owners in terms of bitcoin, but there are some known bitcoin millionaires more noteworthy than their peers.

1. Cameron and Tyler Winklevoss

No millionaires have been in the bitcoin news during 2016 as much as Cameron and Tyler Winklevoss, the twin brothers made famous for their feud with Mark Zuckerberg over the founding of Facebook Inc. (NASDAQ: FB). The twins once bragged that they owned 1% of all bitcoin, which, as of early 2016, amounts to approximately 1.5 million bitcoins. While it is possible that they own these across multiple accounts, it is unlikely that they actually own that many, since the top five accounts only amount to 510,000 bitcoins.

The Winklevoss brothers launched a digital currency exchange called Gemini Trust Co. in October 2015 and followed that up with The Winklevoss Bitcoin Trust, a proposed exchange-traded fund (ETF) focused on bitcoin.

2. Tony Gallippi

The chairman of virtual currency payment processor Bitpay, Anthony "Tony" Gallippi is one of the pioneers of merchant-based bitcoin services. He founded Bitpay in 2011 and served as CEO until May 2014, after which he moved into the executive chairman role. Gallippi has a bachelor's degree in Mechanical Engineering from the Georgia Institute of Technology. Like most bitcoin millionaires, Gallippi does not publicize the value of his account. Estimates have put the value of his account above $20 million, however. His total net worth is likely considerably higher.

3. Dave Carlson

One of the genuine mining-your-way-to-riches bitcoin stories belongs to Dave Carlson, a software engineer turned bitcoin legend. Carlson founded the decentralized bitcoin mining company MegaBigPower from his basement, along with some help from the Polish research center BioInfoBank. As of 2016, Carlson ran a 2,000-square-foot warehouse full of mining computers and powered by 30 tons of air conditioning. Estimates of Carlson's bitcoin wealth vary wildly, but he claims that it earned $8 million per month at the peak of bitcoin's market value.

4. Charlie Shrem

Charlie Shrem is one of the most interesting and infamous characters in bitcoin. At the age of 22, Shrem founded the wildly successful bitcoin exchange BitInstant. Shrem himself first bought a few hundred bitcoins when they were $3 apiece — they were $575 each as of Aug. 19, 2016 — and eventually grew that into a bitcoin fortune worth tens of millions of dollars.

Then, at the age of 25, Shrem was found guilty of violating anti-money-laundering laws by purportedly helping funnel bitcoin to the former online marketplace called Silk Road. He was sentenced to two years in prison at Lewisburg Federal Prison Camp in Pennsylvania. In a post to his bitcoin followers entitled "So, I'm going to prison. Reflections from Bitcoin's first felon," Shrem asked fans to send him magazines, letters and printouts of bitcoin news.

5. Roger Ver

The "Bitcoin Jesus," Roger Ver is among the most outspoken Bitcoin evangelists in the world and has received plaudits from digital currency fans for his promotional style and former habit of giving away bitcoin for free. Ver was the first Bitcoin startup investor, and some have guessed his holdings to be worth $25 million to $50 million. Ver once offered to donate $100,000 to a charity if Senator Bernie Sanders debated talk show host Adam Kokesh. Ver is a self-described "voluntaryist" (a form of anarcho-capitalist political philosophy) and a one-time libertarian candidate for office in California. He has since renounced his citizenship and moved to Japan.

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