Blockchain based OAuth for IoT

We propose the integration of blockchain with the OAuth standard. Two blockchains are considered for the implementation: Ethereum where ACL and token processing is performed on-chain and MultiChain where the processing is performed off-chain. The experiments show that the on-chain token generation provides an additional overhead compared to the off-chain one. However, it provides a secure token management and access traceability. The main advantage of our contribution is to propose a decentralized authorization system while relying on a standard specification.