Traditional Web 2.0 applications consist mainly of "domains" (such as Google.com) and "servers" (such as amazon's cloud services). Then, using the traditional DNS (domain name Service) system, the domain name is mapped to the server's "IP address" so that ordinary users can access Google's website through Google.com. In the Web3 world, to decentralize the two, storage and computing power provided by "servers" can be achieved through a combination of decentralized technologies such as IPFS, Ethereum, and Dfinity, while the community hopes to decentralize "domain names" through blockchain networks. Blockchain networks, led by Bitcoin and Ethereum, are inherently computer-friendly because of asymmetric encryption, often referred to as public-private key encryption, underlying accounts, which makes human readability quite unfriendly. For example, when we make a cryptocurrency transfer, especially when confirming the recipient's address, we are often plagued by the following questions: Is this gibberish address correct? Do you need to check the accuracy letter by letter? Does the letter case disorder want to matter? What if I miss a letter? Can the transaction be rolled back if the transfer is wrong? In contrast, with all the conventional Internet products we use, most of the time we can safely confirm the identity or address of the other party by confirming a simple name, username, nickname, mobile phone number or email address. Faced with a poor user experience in the current world of cryptocurrencies, more and more startups are exploring the space, focusing on "translation" services that translate "lossless" between "computer languages" and "human-readable languages." In order to solve this problem, the team used the function of block chain intelligence contracts, or directly use the chain itself, to build a "map" and "translate" system, the user common block chain native underlying address mapping to a human-readable "user name", as the user to the outside world and open a "identity". For example, transferring money to Ethereum founder Vitalik Buterin does not require recording his original Ethereum account address (0xd8dA... 6045), but simply remember "vitalik.eth," which is a typical human-readable username. Currently, among the underlying protocols for building such user-readable account systems, there are several projects such as Ethereum Name Service (ENS), FIO, DAS, etc., each of which has its own characteristics: ENS is the most popular, FIO provides richer functions, DAS has better interoperability. A key player is ENS, which stands for Ethereum Name Service, an Ethereum-based distributed domain Name Service that provides a secure and decentralized way to resolve simple human-readable domain names into on-chain and off-chain address resources. ENS can map a person's long, hard-to-remember Ethereum address starting with 0x to a custom short address, such as Satoshi. eth, Vitalik. eth, and so on. ENS replaces Ethereum addresses with characters that are easier for humans to remember, a key step in the spread of encryption. Users can choose a friendlier user address to remember, making it easy to send and receive encrypted assets and reducing the risk of mis-addressing when transferring money. In an ENs-enabled wallet, instead of copying and pasting long addresses, users can directly use the ENS domain name to bind various cryptocurrency addresses and receive cryptocurrency payments. Some time ago, the Ethereum Foundation, ENS, and digital identity company Spruce launched login.xyz, a website that tracks the progress of sign-in with Ethereum, Sign-in with Ethereum is a set of technical specifications for logging into third-party Web applications through Ethereum accounts, enabling users to control their digital identities through Ethereum accounts and ENS profiles, rather than relying on traditional middlemen. It is already used in Web3 and aims to standardize on best practices to make Web2 services easier to adopt, while decentralized domains such as ENS will not only be used for addresses but will cover all aspects of DApp services in the future. According to the current development momentum of NFT and the increasing popularity of Web3, ENS and others are also likely to become the next hot wave of NFT, and even become the key carrier of users' digital identity in the Era of Web3, which deserves our special attention.