Bitcoin is a digital and decentralized currency, created in 2009 by someone going by the pseudonym of Satoshi Nakamoto. It is digital because bitcoin only exists in electronic form and decentralized because, differently than traditional currencies (Euro, Dollar), it is not controlled by a central bank nor a government. In fact, Bitcoin is based on blockchain technology, a decentralized system that, thanks to the use of incentives, guarantees the cooperation among all actors that are part of the network.