One of the big challenges in the blockchain world is communicating across blockchains. Some projects, such as Cosmos, have this problem at the center of their approach. Efficient and accurate cross-chain communication is a critical capability to enable blockchains to scale, as well as provide the customized services that different ecosystems will demand. While a few approaches are under development, none of them have really been proven out in the real world under typical business conditions. Once a good solution is found, that blockchain ecosystem will have a huge advantage over others.