In this chapter, we're going to build a consensus algorithm for the blockchain network. A consensus algorithm is a way for all of the nodes inside of the network to agree upon which data is correct and should be retained inside the blockchain. In order to build the consensus algorithm, we are first going to build a new method, called chainIsValid. This method will simply validate a blockchain by comparing all of the hashes of all of the blocks inside of the chain. After that, we are going to build a /consensus endpoint that we will hit whenever we want to use the consensus algorithm.
In this chapter, we're going to learn about the following:
- What the consensus algorithm is
- Building and testing the chainIsValid method
- Building and testing the /consesnsus endpoint
So, let's get started with the consensus algorithm.
