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The lack of a central authority may also make cryptocurrencies safer. "It really is hack-proof because there is not any a person central position of failure," explains David Donovan, government vice president at Publicis Sapient.Εάν μπορεί ο οποιοσδήποτε να δημιουργήσει ένα μπλοκ, τι τον εμποδί