Smart contracts are certainly amongst the most vital and innovative components of the ongoing revolution surrounding blockchain technology. Following the path opened by Ethereum, as the next big step after Bitcoin, Neo excels as a platform optimized for decentralized trustless automated transactions powered by the code contained in these contracts. If the rhythmic generation of blocks is the pumping heart of the network, transactions the blood that carries information back and forth, then smart contracts play the role of veins and arteries, structuring the circulatory system for the next generation of the internet: decentralized autonomous applications.