This thesis tackles the problem of EVM based side chains communication. Our proposal is to study how it is possible to adopt, and adapt, authenticated data transfer protocols for blockchains to allow for cross chain communication between different Ethereum side chains C1 and C2 (and the main net). Specifically, we want to enable C1 to retrive variable or information contained in a contract saved on C2, without needing to download all the blocks of C2 to make sure that the information passed to it is correct.