The value of a single Bitcoin is passed from around 20 USD to 142 USD reached yesterday in just 3 months. The number of Bitcoins in circulation is exploded approaching 1,1 billion as show in the following picture. Mt. Gox and Instawallet suffered a different type of attacks, respectively a distributed DDoS attack and a data breach. Similar events could destabilize the concept of trust that is one of the pillars of the virtual currencys virtual currency Schema.”]