What is the blockchain of the screen？ Everything you want to know is here!

　　Xinhua News Agency, Hangzhou, November 1st (Reporter Ma Jian, Zhu Han, Yin Xiaosheng) Distributed, hard to tamper with and consistent in storage, a technology called "blockchain" is merging with cutting-edge technologies such as artificial intelligence, big data and Internet of Things, quietly changing our lives.

　　What are the characteristics of this technology? What will the life of "blockchain+"look like? What challenges are there before a truly empowered society? The reporter interviewed experts and scholars in this field, trying to paint the young "online celebrity" and lift his mysterious veil.

　　A "very trustworthy" technology

　　Blockchain technology is leading a new round of technological and industrial changes around the world and promoting the transition from "information Internet" to "value Internet". According to public information, blockchain is a kind of accounting technology, which is jointly maintained by many parties, uses cryptography to ensure the security of transmission and access, and can realize the consistent storage of data, which is difficult to tamper with and prevent denial. It is also called distributed account book technology.

　　Chen Chun, an academician of China Academy of Engineering and director of the Blockchain Research Center of Zhejiang University, cited an example of "borrowing money": Zhang San, a fellow villager, borrowed money from Li Si, and then told all the villagers through radio that the villagers had verified the situation through peer-to-peer cross-confirmation, and then each made a note in his own account book, so that all the villagers in the village had records in their account books.

　　"In chronological order, these records can be traced back, but they cannot be tampered with." Chen Chun said that this reflects the characteristics of blockchain single-point initiation, network-wide broadcasting, cross-audit, and joint accounting.

　　"In terms of technology itself, blockchain is an integrated technology that combines distributed computing, peer-to-peer network and cryptography." Cai Liang, executive deputy director of the blockchain research center of Zhejiang University, said that blockchain makes it possible for our Internet to form a valuable and reliable interconnection, which is also considered as an important development direction of the next generation Internet.

　　How will the blockchain change our lives?

　　Because of its distributed, tamper-proof, high transparency and traceability, blockchain technology is very suitable for the business needs of the financial system, so it has been applied in payment and settlement, credit financing, financial transactions, securities, insurance, leasing and other sub-fields.

　　At present, there are three types of blockchain: public chain, alliance chain and private chain. China has a good foundation in the field of blockchain, and the main research focus is on the key technologies of alliance chain. Taking the provident fund management system cooperated by the Ministry of Housing and Urban-Rural Development and China Construction Bank as an example, the provident fund management in 491 cities across the country is equivalent to the point-to-point connection of 491 nodes with the help of blockchain technology. "The provident fund of any city and individuals under the jurisdiction of any provident fund can conduct related business operations in different places." Chen Chun said that if you don’t use blockchain, you can’t imagine it before.

　　Chen Chun said that the development of foreign blockchain is basically based on financial innovation to drive innovation in other industries, while in China, besides financial innovation, it is more important to apply it in various industries.

　　With the gradual maturity of blockchain technology innovation and development, the actual effect of industrial application has become more and more obvious, and the application of blockchain has extended from the financial field to the physical field. Many experts and industry insiders said that blockchain technology will have broad application prospects in China’s government affairs, finance, people’s livelihood and other related fields in the future. For example, through blockchain technology, distributed sharing of government data can be realized; For another example, leading enterprises in the supply chain can transmit their credit to small and micro enterprises through the blockchain, thus partially solving the problem of financing difficulties and expensive financing.

　　China Mobile, China Telecom and China Unicom officially released their respective 5G packages on the 31st, which means that 5G has entered the formal commercial stage, indicating that the first step of operators’ 5G network construction is basically in place. Chen Chun said that the blockchain and 5G complement each other and will certainly generate more sparks. This is also a process of cross-border integration.

　　"We must fully understand the core value of blockchain technology, actively explore and expand the technology landing, give play to the Industry-University-Research advantages of universities, and accelerate the application of blockchain technology in finance, people’s livelihood, government affairs, industrial manufacturing and other fields." Chen Chun said.

　　Large-scale application still faces challenges.

　　Blockchain is still a very "young" technology, and its technology and industrial application are in the initial stage. Experts believe that blockchain technology still faces multiple challenges if it wants to truly empower the economy and society:

　　—— From a technical point of view, the performance of the blockchain needs to be improved. "A standard integrated blockchain framework must contain many technical points, such as a large-scale peer-to-peer network with hundreds of thousands or even hundreds of thousands of nodes. Blockchain is originally point-to-point transmission, but the characteristic of blockchain is that the more nodes there are, the performance will decline exponentially. It is crucial to break through this bottleneck. " Chen Chun said.

　　-From the perspective of talent reserve, there is a big gap in cross-disciplinary professionals. According to the "White Paper on Blockchain (2018)" issued by China ICT Institute, blockchain technology is a multi-disciplinary and cross-disciplinary technology. In the global market, there is a huge gap in talents with relevant senior R&D experience, and the top-level system architecture designer of blockchain is even more difficult to find.

　　—— From the perspective of promotion and application, the blockchain must first be "managed" before it can be "used well". "There is no good supervision, just like there is no traffic police and no traffic lights on the road. The regulatory requirements for blockchain should be higher than those for the Internet. " Chen Chun said that as an important underlying technical facility, blockchain should attach great importance to security issues in its rapid development. "Any good technology or tool needs to be used correctly to maximize its value. The blockchain will be able to fully support the development of a new round of digital economy. "