Digital currencies have emerged as a favourite tool for hackers and cyber criminals, as digital currency transactions are nearly anonymous, allowing cyber criminals to use it in underground markets for illegal trading, and to receive thousands of dollars in ransomware attacks—WannaCry, Petya, LeakerLocker, Locky and Cerber to name a few. Also, every other day we hear about some incidents of hacking of crypto currency exchange or digital wallets, in which hackers stole millions of dollars in Bitcoin or Ethereum.

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