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Ever heard of a Bitcoin? Apparently, it's the most widely used alternative currency, entirely digital and based on an open-source, peer-to-peer protocol. Introduced in 2009, the Bitcoin has gained ground ever since and exploded approximately two weeks ago with the banking crisis in Cyprus.

As of March 2013, Bitcoins have reached a monetary base of $1.28 billion, with 11 million of them in circulation. Their number will continue to grow until 21 million Bitcoins are in circulation. The digital currency isn’t regulated by a central bank and all transactions are peer-to-peer.