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The dearth of a central authority may also make cryptocurrencies safer. "It's hack-proof because there's no a single central level of failure," points out David Donovan, executive vice chairman at Publicis Sapient.Οι παρελθοντικές αποδόσεις δεν εγγυώνται τις μελλοντικέςΟ υπολογιστής σα