In this chapter, we looked at the various options for building interoperable blockchains. To summarize, single custodian, multisignature federations, and hash locking are easy to implement, whereas sidechains are complicated and require a lot of engineering. Soon, we will have production-permissioned blockchain platforms that have sidechains support built in.
Finally, we implemented hash locking by simulating two central and commercial banks. You can go ahead and try to build two different networks and attempt to conduct an atomic exchange.
In the next chapter, we will learn how to build a blockchain as a server for Quorum. While building this, we will learn about the concepts of DevOps and cloud computing too.