If you have been following banking, investing, or cryptocurrency over the past few years, you may be familiar with “blockchain,” the record-keeping technology behind the Bitcoin network. And there’s a good chance that it only makes so much sense. In trying to learn more about blockchain, you’ve probably encountered a definition like this: “blockchain is a distributed, decentralized, public ledger.” In this course, we would like to introduce you to block chain and provide a brief history of block chain.