What kind of the data is the most important data in the era of big data? All social members, which include the governments, the organizations, the companies, and the individuals, are interested in the data of the cash, so the most important data is the data of the cash. Then, where is the most reliable and the most correct data of cash? Because the data of the cash in all banks is recorded by using of all smart cards automatically, the customers’ data of the cash in these banks is the most trustworthy.The data of the cash in the banks can be regarded as a standard or a ruler of measuring other data of the cash. From this idea, I wrote the two books of the Digital Currency Embedded in Identities of All Society Members I and II . Based on these two books, I have developed and extended a concept of the Digital Inventory. The inventory account is a concomitant of the cash account or the account receivable (account payable) account.There are only two kinds of forms of the three accounts which appear in a transaction sub-equation. First, there must be the cash account with the inventory account in a transaction sub-equation. Of course, this sub-equation may include the account receivable (account payable) account. When the cash is embedded in a social member identity, the inventory is also embedded in this social member identity automatically. Another is that there is not any cash account and is only account receivable (account payable) account with the inventory account in a transaction sub-equation. The lowest subaccount of the account receivable (account payable) account is a telephone number and there is a relationship of one to one between a telephone number and a social member identity. Therefore, when a transaction sub-equation only includes an account receivable (account payable) account and an inventory account, the inventory is also embedded in this social member identity automatically. By tracking the embedded identity, the parts of this inventory and its product code will be detected. All inventories embedded in all social members’ identities and information of their parts and their product codes will be consisted of the Digital Inventory. The combination of internet and the digital inventory by using of programming is the Internet of Things. The core technology will be introduced in detail in this book. The Internet of Things will realize intelligent recognition, tracking, monitoring and management of all inventories. In this situation, counterfeit and shoddy products will be impossible to occur.Keywords: digital currency, digital inventory, and internet of things
