*5.6. Metaverse*

In the science fiction "*Snow Crash*" published in the 1990s, a virtual world was constructed, which is a concept of "metaverse" in today's view. In 2021, the concept of "metaverse" will rise. Metaverse' first year. There are many definitions of the metaverse now, it is necessary to build a virtual world with a strong sense of experience. The future Metaverse will not disappear with the collapse of an Internet company, and the economic system in the metaverse will not disappear. To be interconnected with the economic system of the real world, more and more internet giants are optimistic about the development potential of the Metaverse. With the renaming of Facebook and the listing of the Roblox game company, the concept of the Metaverse instantly aroused thousands of waves. Leading to other Internet Giants are also pouring to speed up the layout of the Metaverse, which will lead to the accelerated development of the industry and the entry of capital, and it will further accelerate the integration of manpower and resources, which will further enhance the market's value expectations for the Metaverse, and then form a market outlet industry. In this way, investment and speculation in the market will continue to flow, and the total value of the industry related to the Metaverse has now reached about 714 million US dollars. In the future, running the metaverse will probably need to include a large number of NFTs, cryptocurrencies and NFT-related products will be used in the future virtual world. It can be used, leased and bought and sold in the metaverse, which requires the use of a large number of cryptocurrencies to promote the market's investment interest in cryptocurrencies.

Since many companies do not currently have data related to each other, the entire data will be integrated in the future metaverse. This step may become a revolution in the "interface" between the real world and the digital world. Since the current metaverse is still in the early stage of development, there will be huge changes in the future. Metaverserelated projects are also being explored in the industry. At present, NVIDIA has created the NVIDIA Omniverse platform, which can use digital twin technology to build a virtual factory in a virtual world, and real products can be tested. Its data can be Synchronized with the real factory, which can liberate productivity, reduce costs and increase efficiency.

The metaverse must bring about drastic changes, which require continuous innovation of a large number of technical means. At the same time, virtual currency is booming, which also promotes the development of the virtual world. However, since the construction of the metaverse and the entire virtual world is still in its infancy, it should be subject to the supervision of relevant international organizations. It is possible to explore the use of legal digital currency as the transaction currency of the metaverse.

Based on the monetary entropy formula, this study gives the concise measurement Equation (8). The six influencing factors, such as inflation, Bitcoin futures ETF, NFT, DAO, Web 3.0 and Metaverse, are measured separately in Equation (8). *Cei* represents the entropy value of the 6 influencing factors, *w* is the lifetime coefficient, *N* represents the elastic index, *V* stands for the volume of economic activity, *Co* is a constant.

$$\mathbb{C}e\_i = (\mathcal{W}\_{\dot{\imath}} - \mathcal{W}\_{\dot{\imath}}\mathcal{N}\_{\dot{\imath}}) \ln(V\_{\dot{\imath}}) + \mathbb{C}\_o \tag{8}$$

Equation (9), *Ce* represents the measurement of the overall development of cryptoeconomy in smart cities under the combined effect of six factors such as NFT, DAO, WEB3.0, etc. After we get the crypto-economy entropy, we can infer the financial market operation in the smart city. *Ce* <sup>=</sup> *<sup>C</sup>*(*Ce*<sup>1</sup> ... *Cen*) (9)

$$\mathbb{C}\mathfrak{e} = \mathbb{C}(\mathbb{C}e\_1 \dots \mathbb{C}e\_n) \tag{9}$$

After analyzing the changes in the world's political economy, NFT, DAO, WEB3.0, bitcoin futures ETF, Metaverse, it can be seen the entire traditional financial market is changing, online world is also undergoing restructuring. At the same time, with the development of communication technology, it will reshape a new economy patterns and social formations. Blockchain technology enables everyone to have the opportunity to integrate into economic and social development. However, because of it is still in the early stage of development and the development rules are not perfect, it is necessary to improve supervision capabilities to meet the challenges of the ever-changing encrypted economy in the future of smart city.
