Blockchain technology represents an interesting architectural invention that will primarily address the challenges of cybersecurity on the internet. As I previously discussed, the existing central database architectures cannot provide the security necessary to launch IoT systems. Blockchain is defined as a “ledger-based” system, in that it is designed to track all transactions and update all members of the chain. In actuality, the block chain design evolved from what started as a linked list data structure. Essentially, a linked list originally was designed as a data structure that linked to another data element by storing information about where a value was stored in memory. It is a pointer system that shows prior (previous) links and forward links as shown in Fig. 7.1.