During these years the Blockchain technology is living a growing era. It is based on a peer to peer network that allows the transfer of the assets among users involved in the network, without the needs of a third party. The network's transactions are handled by a consensus algorithm that performs the validation process and updates the ledger by adding the transactions block to the chain. The concept behind the blockchain is that all the transaction data are completely public, nevertheless, the identity of the user involved is kept secret. By the last years, many companies are getting interested in the blockchain applications.