Some of Bitcoin enthusiast Mike Caldwell's coins and paper vouchers often called "paper wallets" are pictured at his office in Sandy, Utah

Some of Bitcoin enthusiast Mike Caldwell’s coins and paper vouchers, often called “paper wallets”, are pictured at his office in this photo illustration in Sandy, Utah, January 31, 2014. Caldwell recommended their use as a way to store Bitcoins offline. REUTERS/Jim Urquhart REUTERS/Jim Urquhart (UNITED STATES – Tags: BUSINESS)

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