If you remember, the whole world was alarmed by the WANNACRY cyber attack of May 2017, when millions of computers and websites were encrypted with a ransomware attack that also led to the London hospital crisis. Millions of users paid the ransom in bitcoins. The fact that the software Wanna cry had a key to defuse it, which was discovered after a few days, counting computer security analysts said it was just a test, waiting for a bigger attack, because the gain had been limited. He expected a larger attack but there were thousands of small attacks, not the dreaded flood. Given the familiarity of Wannacry’s attackers with bitcoins, it is therefore likely that the real objective was the launch of bitcoin as an alternative currency to traditional currencies. In fact, bitcoin, which had previously been limited in its diffusion, assumed the role of a world-wide currency.