Blockchain in simple terms, its explanation, regardless of any expert's interpretation, is primarily a ledger technology that is distributed and decentralized, initially used for accounting. It is a revolutionary ledger technology that is public, transparent, and protects privacy. How important is a ledger? It is the core order and law of operation for all modern companies and national finances. This set of laws is now a double-entry bookkeeping system, but the operation of this global ledger law is currently such that some do not dare to disclose the original accounts; there can be multiple sets of accounts, loopholes, false accounts, and many at least two sets of accounts—one internal and one external—with auditing being extremely complicated. Those involved in finance and accounting are certainly familiar with this, right? Including Deloitte, they would also not be unfamiliar with this, and even the internal workings of national financial accounting would not be unfamiliar. There are false statistics, false data, false accounts, multiple sets of accounts, and even the ability to forge vouchers, leading to economic ailments that cause headaches for society as a whole. Blockchain technology is set to change the underlying operational rules of this ledger. Bitcoin—the first global digital ledger, a trillion-dollar decentralized economic system, has been running for over a decade without a hitch, earning widespread trust globally.