Due to its core characteristics, blockchain research has gained attention (Alrubei et al, in Ethereum blockchain for securing the Internet of Things: practical implementation and performance evaluation. IEEE, 2019 [1]). This is because it provides anonymity, security and integrity and is independent from the reliable 3rd party organizations. Blockchain technology could initially only be employed with currency. However, applications outside of crypto currencies are already being created and investigated thanks to the emergence of Ethereum, which enables the development and how smart contracts are executed (miniature computer programmes that operate on blockchain technology). The fact is that an enormous progress has been made for the improvement of the technology of blockchain and stress is given on smart contracts (Zhaofeng et al, in IEEE Trans Ind Inform 16(3):2013–2021, 2019 [2]). It was found that few descriptive studies on the application of smart contracts for security of IoT and Internet are present. The purpose of this research project is to locate and evaluate scholarly works on smart contracts based on blockchain for securing the Internet.