Block chain public chain private chain token
blockchain includes public blockchain, joint (instry) blockchain and private blockchain. Public chain point-to-point e-cash system: bitcoin, smart contract and decentralized application platform: Ethereum
blockchain is a new application mode of distributed data storage, point-to-point transmission, consensus mechanism, encryption algorithm and other computer technologies
blockchain is an important concept of bitcoin. In essence, it is a decentralized database. At the same time, as the underlying technology of bitcoin, it is a series of data blocks generated by using cryptographic methods. Each data block contains a batch of bitcoin network transaction information, Used to verify the validity of its information (anti-counterfeiting) and generate the next block
extended data
according to the different degree of blockchain network centralization, three kinds of blockchains under different application scenarios are differentiated:
1. The blockchain with the whole network open and without user authorization mechanism is called public chain
2. The authorized nodes are allowed to join the network, and the information can be viewed according to the authority. It is often used in the inter agency blockchain, which is called alliance chain or instry chain
3. All the nodes in the network are in the hands of one organization, which is called private chain
alliance chain and private chain are also called licensing chain, and public chain is called non licensing chain
blockchain features
1, decentralization. Blockchain technology does not rely on additional third-party management institutions or hardware facilities, and there is no central control. In addition to the self-contained blockchain itself, each node realizes information self verification, transmission and management through distributed accounting and storage. Decentralization is the most prominent and essential feature of blockchain
2. Openness. Blockchain technology is based on open source. In addition to the private information of all parties involved in the transaction is encrypted, the data of blockchain is open to everyone. Anyone can query blockchain data and develop related applications through the open interface, so the information of the whole system is highly transparent
3. Independence. Based on consensus specifications and Protocols (similar to various mathematical algorithms such as hash algorithm used by bitcoin), the whole blockchain system does not rely on other third parties, and all nodes can automatically and safely verify and exchange data in the system without any human intervention
4. Safety. As long as 51% of all data nodes cannot be controlled, the network data cannot be arbitrarily manipulated and modified, which makes the blockchain itself relatively safe and avoids subjective and artificial data changes
5. Anonymity. Unless there are legal requirements, technically speaking, the identity information of each block node does not need to be disclosed or verified, and the information can be transferred anonymously
Public chain, also known as "public chain", refers to the blockchain that anyone in the world can enter the system at any time to read data, send confirmatory transactions and compete for bookkeeping. The public chain is generally considered to be "completely decentralized", because no indivial or institution can control or tamper with the reading and writing of data in it. In terms of application, blockchain public chain mainly includes bitcoin, Ethereum, super ledger, most counterfeit currencies and smart contracts. The ancestor of blockchain public chain is bitcoin blockchain, which has the following characteristics:
1, open source code
upload the code to GitHub, and everyone can get complete blockchain data by downloading, Accept the test of the public
2, complete decentralization
anyone can become a node, each node is open, everyone can participate in the calculation of the blockchain, any node is not permanent, but phased, and any center is not mandatory for nodes. Anyone can read and send transactions, and transactions can be effectively confirmed on the blockchain. Anyone can participate in the consensus process. The consensus process determines whether a block can be added to the blockchain and the exact current state. Everyone can get financial reward from it, which is proportional to their contribution to the consensus process. These public chains are generally considered to be "completely decentralized"
3. Developing decentralized applications
through this public chain, developers can easily develop centralized applications. Public chain can protect the rights and interests of users from the influence of program developers
This is two different concepts. According to different standards, blockchain can be classified into three categories:
& # 8195&# 8195; 1) According to the network scope of blockchain, it can be divided into public chain, private chain and alliance chain
&# 8195; 2) According to the docking type of blockchain, it is divided into single chain, side chain and interconnection chain
&# 8195; 3) According to the display environment of blockchain deployment, it can be divided into main chain and test chain
the main chain can be understood as a formal online and independent blockchain network, while the public chain refers to a blockchain that can be read by anyone, can send transactions and can be effectively confirmed by anyone, and can participate in its consensus process
Blockchain is a new application mode of distributed data storage, point-to-point transmission, consensus mechanism, encryption algorithm and other computer technologies. Blockchain is an important concept of bitcoin. It is essentially a decentralized database. At the same time, as the underlying technology of bitcoin, it is a series of data blocks generated by using cryptographic methods. Each data block contains a batch of information about bitcoin network transactions, Used to verify the validity of its information (anti-counterfeiting) and generate the next block
if such technology wants to be put into application, the biggest problem is the "Impossible Triangle problem"
that is, scalability, decentralization and security cannot be achieved at the same time, and only two of them can be achieved
most of the existing public chain projects in the market are difficult to put into use on a large scale
the core advantage of blockchain technology is decentralization, which can realize point-to-point transaction, coordination and cooperation based on decentralized credit in a distributed system without mutual trust by means of data encryption, time stamp, distributed consensus and economic incentive, so as to solve the high cost and low cost of centralized institutions Low efficiency and data storage insecurity provide solutions
the application fields of blockchain include digital currency, token, finance, anti-counterfeiting traceability, privacy protection, supply chain, entertainment, etc. with the popularity of blockchain and bitcoin, many related top domain names have been registered, which has a great impact on the domain name instry
taking the tourism instry as an example, blockchain applications mainly focus on tourism travel, tourism community reviews, digital identity management, credit consumption management, tracking pilot's professional certificate and qualification, loyalty plan of hotels and airlines, reservation management and consumption points management. In addition, blockchain also has applications in finance, games, entertainment and other fields.
Blockchain instry presents rapid development, helping the real economy to rece costs and improve efficiency
at present, a new round of scientific and technological revolution and instrial change sweeping the world, big data, cloud computing, Internet of things, artificial intelligence, blockchain and other new technologies continue to emerge, and the digital economy is profoundly changing the way of human proction and life, becoming a new driving force of economic growth. As a disruptive technology, blockchain is leading a new round of technological and instrial changes in the world, and is expected to become
the "source" of global technological innovation and mode innovation, and promote the change from "information internet" to "value Internet"
in China's 13th five year plan for national informatization, blockchain is regarded as a key cutting-edge technology, and it is clearly proposed to strengthen the innovation, experiment and application of new technologies such as blockchain,
in order to seize the leading power of the new generation of information technology. At present, China's blockchain technology continues to innovate, and the blockchain instry has initially taken shape. It has begun to be rapidly applied in supply chain finance, credit reference, proct traceability, right trading, digital identity, electronic evidence and other fields. It is expected to promote China's economic system to achieve technological change, organizational change and efficiency change, and make an important contribution to the construction of a modern economic system
as of June 2018, China's blockchain related business has initially formed a scale under the promotion of the government, enterprises and capital, and is in the forefront of the world in terms of the number of patents, financing environment, policy support and application landing
the instry is developing rapidly, and the number of enterprises is increasing rapidly.
according to the statistical data of in depth analysis report on business model innovation and investment opportunities of blockchain instry published by prospective instry research institute, there were 406 patent applications related to blockchain in the world in 2017, of which 225 were from China. As of the end of March 2018, the number of blockchain based companies in China has reached 456. The blockchain instry has initially formed a scale. From the upstream hardware manufacturing, platform services, security services to the downstream instrial technology application services, instry investment, media publicity, talent services and other instrial chain links are basically complete
from the change of the number of newly established companies in China's blockchain instry, the number of Companies in this field began to increase in 2014, and the number of newly established companies increased significantly in 2016, more than 100, more than three times of 2015. 2017 is the peak period of blockchain entrepreneurship in recent years. Due to the rapid popularization of blockchain concept and the graal maturity of technology, many entrepreneurs swarmed into this field, and the number of newly established companies reached 178
from equipment manufacturing to instrial application, the context of the blockchain instry chain is graally clear.
from the distribution of newly established companies in the blockchain instry segmentation field, as of the end of March 2018, the number of instrial application companies in the blockchain field is the largest, including 86 companies providing application services for the financial instry and 109 companies providing application services for the real economy. In addition, there are more than 40 related companies in blockchain solutions, underlying platforms, blockchain media and communities
from the perspective of the distribution of investment events in the blockchain instry segments, companies related to instrial application services have the largest number of investment events, with a total of 113. It can be seen that investors are paying more and more attention to projects with specific application scenarios that can be actually implemented. The number of events in the field of underlying platform is 42, and the number of events in the field of blockchain media and community is 28. The field of blockchain is attracting more and more entrepreneurs and capital, becoming a new highland for innovation and entrepreneurship. With the development of blockchain technology and the acceleration of application, the instrial scale will continue to increase, and this field is expected to become a new economic growth point in the future
the influx of Internet giants has rapidly promoted the development of China's blockchain instry
blockchain technology is not only favored by start-ups, but also widely concerned by internet giants. Internet giants have expanded their blockchain business and rapidly promoted the development of China's
blockchain instry. At present, Tencent, Alibaba, Internet, Jingdong and other Internet instry giants have joined in the research and scenario application of blockchain technology
the regional distribution is relatively concentrated, and the instrial agglomeration effect is obvious.
from the perspective of the regional distribution of China's blockchain companies, Beijing, Shanghai, Guangdong and Zhejiang are still the concentration places of blockchain entrepreneurship, accounting for more than 80% of the total. Among them, Beijing is in the absolute leading position with 175 companies, accounting for 38%; Shanghai ranked second with 95 companies, accounting for 21%; Guangdong Province ranked third with 71 companies, accounting for 16%; Zhejiang Province ranked fourth with 36 companies, accounting for 8%. In addition, Jiangsu, Sichuan, Fujian, Hubei, Chongqing and Guizhou are among the top ten provinces in China's blockchain entrepreneurial activity
the application of blockchain is diversified, extending from finance to the field of entity
blockchain technology has the characteristics of distributed, tamper proof, high transparency and traceability, which is very suitable for the business needs of the whole financial system. Therefore, it has been applied in payment and clearing, credit financing, financial transactions, securities, insurance, leasing and other sub fields. For example, Minsheng Bank and China CITIC Bank jointly launched the first domestic L / C blockchain application, and Ping An of China's two major application scenarios of asset trading and credit reference have been online. China Merchants Bank has landed the first domestic blockchain cross-border payment application, and Weizhong bank has shortened the reconciliation time from t + 1 day to t + 0 day through the inter agency reconciliation platform based on blockchain, realizing daily quasi real-time reconciliation
with the graal maturity of blockchain technology innovation and development, the actual effect of instrial application has become more and more obvious
now, the application of blockchain has extended from the financial field to the physical field, including electronic information deposit, right management and trading, proct traceability, digital asset trading, Internet of things, intelligent manufacturing, supply chain management and other fields. Blockchain technology began to be deeply integrated with the real economy instry, forming a number of "instrial blockchain" projects, ushering in the era of "a hundred flowers bloom" of instrial blockchain
to realize "informatization of cooperation links" and help the real economy rece costs and improve efficiency, Specifically, we can promote the development of traditional instries from two aspects of "cost rection" and "efficiency improvement"
in addition to low cost and high efficiency, blockchain can also realize "trust transfer" or "trust spillover". Based on blockchain technology, since the information on the chain can not be tampered with, after the two parties jointly verify a transaction, the third party can also trust the information, In fact, this kind of trusted state can be transmitted to a third party, and then realize the capitalization of data. In addition, it is very easy for institutions to turn from the "black box" state to the "white box" state, that is, the operational mechanism of institutions is transparent, which makes it very easy to prove their innocence and greatly reces the cost of mutual trust between multi-agent
Further, blockchain will play the role of "improving the efficiency of instrial chain coordination". To improve the level of instrial collaboration is an important way to promote made in China to move towards the middle and high end, and also an important requirement for building a modern economic system. However, in many instries, the efficiency of instrial chain collaboration is still not high, especially in the field of international tradetechnology abuse leads to certain risks in instrial development, which can not be ignored
although the positive value of blockchain technology graally appears, there are still a series of risks that can not be ignored in the process of instrial development. On the one hand, it is compliance risk. In the early stage of the development of blockchain, because it has the property of transmitting value, it has attracted some behaviors that are not focused on technology application, but are keen on illegal fund-raising, pyramid selling and even fraud through ICO (initial token issue)
the instrial policy system has been graally constructed, and the instrial development environment has been continuously optimized. In December 2016, the notice of the State Council on printing and distributing the 13th five year plan for national informatization first mentioned blockchain, and took it together with quantum communication, artificial intelligence, virtual reality, big data cognitive analysis, driverless vehicles and other technologies as key cutting-edge technologies, clearly proposed the need to strengthen the innovation, testing and application of blockchain and other new technologies, In order to seize the leading power of the new generation of information technology. Secondly, relevant instry, national and international standards are also speeding up to solve the key technical standards of blockchain and promote the ecological development of blockchain instry. In order to grasp the development opportunity of blockchain instry and seize the commanding point of blockchain instry development, local governments timely issued blockchain technology and instrial development support policies, which ushered in a new outbreak of blockchain instry
at present, local governments are actively positioning blockchain technology from the perspective of instry and seizing the new opportunities brought by technology upgrading. For example, in March 2018, the Hebei provincial government issued the guiding opinions on accelerating instrial transformation and upgrading and building a modern instrial system, proposing to actively cultivate and develop future instries such as blockchain and build a world-class high-tech instrial cluster
According to the overall plan of the 19th National Congress of the Communist Party of China, preventing and defusing major risks is one of the priorities of China's economic work in the next three years, and the key to preventing and defusing major risks is to prevent and control financial risks. Therefore, China also actively strengthens instry supervision, prevents possible financial risks in the process of blockchain development, maintains the stability and security of national finance, and promotes the healthy development of blockchain instry, so as to better play the positive role of blockchain "value Internet"blockchain is a cutting-edge technology, and the new regulatory challenges caused by technology also require the continuous progress of regulatory technology. "Reg tech" (regulatory Technology) in the financial technology segment. It is to use new technologies such as big data, artificial intelligence and blockchain to solve regulatory compliance problems and rece compliance costs. Blockchain filing platform and blockchain based regulatory system all belong to the field of reg tech. There have been companies engaged in regulatory technology in China, which mainly provide regulatory technology solutions for the government, major banks and other financial regulatory agencies. Jinqiu technology, zhongxiangbit and other companies have launched a supervision system based on blockchain
Blockchain is strictly divided into three types: public chain, private chain and alliance chain. The core difference between these three types of blockchains is the degree of openness or decentralization of access rights. Generally speaking, the higher the degree of decentralization, trust and security, the lower the transaction efficiency
generally speaking, each type of blockchain has its own specific mode and value, which is better than others. As long as the demand is solved, the blockchain is valuable