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Appeared for the first time in 2009, bitcoin still exists today. exchange rates fluctuate and are difficult to predict, prices tend to increase from year to year. The last value skyrocketed bitcoin, beating the value of gold. The WannaCry global-scale cyber attack has caused an uproar for many people. In no time, the news of this ransomware attack went viral. People who are used to using computers are worried about the WannaCry virus infecting their computers. All files from computers affected by the WannaCry attack are automatically locked or digitally encrypted. To open it, the victim had to deposit US$300 in the account of the hacker who spread WannaCry. But, it's not really real dollars that are demanded, but in bitcoins. The name bitcoin also became a concern for this incident. The question remains from the WannaCry case. Actually, what is bitcoin? Here's the explanation. Its use is universal, free from bank and state regulations. Bitcoin offers easy transactions for its users. Created in 2009 by the user name Satoshi Nakamoto, bitcoin is a digital currency (cryptocurrencies) that anyone can use without revealing their real identity (anonymously) and without the need for control from an authority such as a central bank. This is the reason why the WannaCry spreading hacker wants bitcoin. In contrast to currencies in general whose issuance and circulation are regulated by the central bank and the state, bitcoin is obtained by solving mathematical numbers (algorithms) or computations. By using special hardware and software, bitcoins are obtained in the process of mining or mining (replacing the term computing). The flexibility contained in bitcoin by giving full control to the user does not necessarily mean that the user is also free to make changes. There is a need for mutual agreement between users so that the use of bitcoin remains as it should be. With an agreement or consensus among all users, bitcoin will and will continue to work well. Because it exists digitally and is transacted online, it does not mean that bitcoin has no exchange value. Bitcoins can be exchanged for currencies that have been commonly used by the public. The exchange is hosted on the Bitcoin exchange website. Opening at $84.1 in 2013, bitcoin's last exchange rate against the dollar has touched $2,216.20. Noted a number of merchants have accepted payments with bitcoin. Confirmed names include PayPal, Microsoft, Dell, Newegg, Overstock.com, Expedia, TigerDirect, Dish Network, Zynga, Time Inc, PrivateFly, Virgin Galactic, Dynamite Entertainment, Clearly Canadian and Sacramento Kings.