Bitcoin is an electronic currency introduced in 2008 by a programmer known as Satoshi Nakamoto. Bitcoin is circulated within a peer to peer network that make use of encryption mechanism to ensure the reliability and the value of currency. What has made really popular the Bitcoin is the absence of central government whom decisions could induce phenomena of inflation or deflation and the anonymity of the transfer between entities in the network. The model is enriched by another actor, entrusted entrusted with the task of verifying that each coin is spent only once, this central authority is called mintmint”]