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The lack of a central authority can also make cryptocurrencies safer. "It is really hack-proof for the reason that there is not any a single central issue of failure," points out David Donovan, govt vp at Publicis Sapient.Εάν δεν είσαι φίλος του γραπτού λόγου τότε μπορείς να δεις τοΈτσι, στέ�