Bitcoin is a virtual currency that isn't controlled by a central bank. Instead, bitcoins are created through a process called mining, in which a computer tries to solve a cryptographic problem. The total supply of bitcoins is capped, which has led to comparisons with assets like gold.
Koch's original $27 investment is now worth about $886,000, Koch told the Norwegian broadcaster NRK. That's a return of 3,281,500% in four years.
Koch has used one-fifth of his bitcoin stash to buy an apartment in Oslo, Norway, the Guardian reports.
--Saumya Vaishampayan
Follow Saumya @saumvaish
Follow The Tell @thetellblog
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