A. Today...

A Today, the main concern caused by the increasing use and widespread acceptance of bitcoin is related to the high instability of its prices, and to its connections with the black market. B The association of bitcoin with drug trafficking and with the digital black market has granted it prominency and renown in spite of its price volatility. C Since 2015 bitcoin has been sustaining the online e-commerce and laundering dirty money. D The decentralized paying system created by cryptocurrencies has affected the stability of the usual control exerted by the central banks. E In face of the new phenomenum of the cryptocurrencies, new versions of digital currencies are being considered by the central banks.