In Step 17 individual computers were turned into nodes of a purely distributed peer-to-peer system that communicate with one another about transaction data and new blocks to be added to the blockchain-data-structure. This step focuses on what happens once a node receives transaction data and how to ensure that only valid transaction data and blocks are added to the blockchain-data-structure.
The Metaphor
Let’s consider a company that offers a simple service: grading multiple-choice tests for schools and universities. Schools and ...
