First published on Medium.com at Dec 28th, 2018AbstractThe blockchain world is still consisted of isolated chain islands and chain interconnection will no doubt be the future. There are projects like Cardano，Cosmos and PolkaDot trying to solve the problem besides Bitcoin and Ethereum. Cardano uses sidechains to connect other chains. Cosmos and PolkaDot try to provide interchain network platform, interconnecting by means of chain relay. Cardano is driven by research and uses math proved blockc...