Blockchain is considered a revolutionary and potentially disruptive technology. Briefly, a blockchain is a distributed ledger among a network of computer nodes where data is stored in a transparent, immutable, and verifiable way to anyone through a consensus protocol. Decentralised consensus and security are achieved through the combination of cryptographic protocols with an economic incentive system. Initially, applications for this technology were only done in financial field until the development of Ethereum platform, which is focused on smart contracts. A smart contract is a code that runs on top of a blockchain and executes itself when certain conditions are met. The use of smart contracts allows to stipulate deals between two or more anonymous parties, or to develop entire platforms or ecosystems within the blockchain.