The risk of blockchain Technology

1. blockchain is a new application mode of distributed data storage, point-to-point transmission, consensus mechanism, encryption algorithm and other computer technologies. The so-called consensus mechanism is a mathematical algorithm to establish trust and obtain interests between different nodes in the blockchain system
blockchain is the underlying technology of bitcoin, like a database ledger, recording all transaction records. Because of its safety and convenience, this technology has graally attracted the attention of the banking and financial instry
in April 2018, a group of scholars from Oxford University announced the establishment of Woolf University, the world's first blockchain University
in a narrow sense, blockchain is a kind of chain data structure that combines data blocks in chronological order in a sequential way, and it can not be tampered with and forged by cryptography
broadly speaking, blockchain technology is a new distributed infrastructure and computing method, which uses blockchain data structure to verify and store data, uses distributed node consensus algorithm to generate and update data, uses cryptography to ensure the security of data transmission and access, and uses intelligent contract composed of automated script code to program and operate data.

2.

From the perspective of technology and architecture, I will tell you my understanding of blockchain in common language

what is blockchain? In a word, blockchain is a storage system. To be more specific, blockchain is a distributed storage system without an administrator and each node has all the data

What are the common storage systems like

first, how to ensure high availability

the common storage system usually uses "rendancy" to solve the problem of high availability. As shown in the figure above, if the data can be copied into several copies and rendant to multiple places, high availability can be guaranteed. The data in one place is hung, and there is data in other places. For example, the master-slave cluster of MySQL is the same principle, and the raid of disk is also the same principle

two points need to be emphasized in this place are: data rendancy often leads to consistency problems

1. For example, in the master-slave cluster of MySQL, there is actually a delay in reading and writing, which means there is a inconsistency in reading and writing in a short period of time. This is a side effect of data rendancy

The second point is that data rendancy often reces the efficiency of writing, because data synchronization also consumes resources. If you add two slave libraries, the write efficiency will be affected. The common storage system is to use rendancy to ensure the high availability of data

so the second question, ordinary storage system, can write more

the answer is yes, for example, take this graph as an example:

in fact, MySQL can do a master-slave synchronization of al masters, master-slave synchronization of al masters, two nodes can be written at the same time. If you want to do a multi room multi live data center, in fact, multi room multi live data synchronization. What we should emphasize here is that multi-point writing often leads to the consistency problem of writing conflicts. Take MySQL as an example, suppose that the attribute of a table is self incrementing ID, then the data in the database is 1234 now. If one of the nodes writes and inserts a piece of data, it may become 5, and then these 5 pieces of data are synchronized to another master node, Before synchronization, if another write node inserts a piece of data, a piece of data with self incrementing ID of 5 will be generated. Then, after the generation, synchronize to another node, and the synchronized data will conflict with the two local 5's after it arrives, which will lead to synchronization failure and write consistency conflict. This problem will occur in the case of multi-point writing

how to ensure consistency in multi-point writing

the reform "Swan class" gives you more technical work

3.

Although driven by the influx of capital and talents, the blockchain instry ushered in rapid development, but as an emerging instry, the frequent warning of its security vulnerabilities caused people to worry about the risk of blockchain

Yu Kequn, director of the national information technology security research center, pointed out that the emergence of blockchain has brought people a lot of expectations for privacy exposure, data leakage, information tampering, network fraud and other issues. However, there are still many challenges in the security of blockchain

Li Bin, assistant director of China Information Security Evaluation Center, analyzed that the current blockchain is divided into three types: public chain, private chain and alliance chain. No matter which type, it faces security challenges in algorithm, protocol, use, time limit and system. What is particularly critical is that the current blockchain is still facing 51% attack problem, that is, nodes can successfully tamper and forge blockchain data by mastering more than 51% of the network examples

it is worth noting that in addition to external malicious attack risk, blockchain also faces the threat of its endogenous risk. Yu Kequn reminded that how to build a complete security application system around the equipment, data, application, encryption, authentication and authority of the application system of the whole blockchain is an important problem that all parties must face

Wu Jia also analyzed that as an emerging instry, employees in the blockchain instry are lack of safety awareness, which leads to the low safety factor of the software and hardware related to the blockchain and a large number of security loopholes. In addition, there are many ecological links in the whole blockchain. In contrast, the strength of the relevant security employees is scattered and it is difficult to form a joint force to solve the problem. A systematic solution is needed to meet the above challenges

content source: zhongxin.com

4. Yes, blockchain is a high-risk project.

5. You mean digital currency? Digital currency based on blockchain technology has good performance in operation security, but it also exposes many problems. Most governments are cautious or resistant to the current non legal digital currency, and the research on legal digital currency continues to improve. The main risk is that there is no commercial application foundation and it can't be realized. Honghua coin has done a good job in this aspect. He has cooperated with Chinese people all over the world to realize the decentralization of enterprises, so we can learn more about it.

6. There are patches
this problem is actually very simple
your graphics card is OK! But the vertical synchronization of the graphics card is not off, so the FPS is very low. You can turn off the vertical synchronization in the properties of the graphics card
it must be this problem
the properties of the graphics card can be found by right clicking on the desktop, and then properties - Settings - Advanced<

vertical synchronization is off
in the 3D settings of the graphics card

7. What blockchain technology can't do
the white paper on China's blockchain technology and application development (2016) issued by the Ministry of instry and information technology points out that blockchain is mainly used in the Internet of things, intelligent manufacturing, supply chain management, digital asset trading and other fields, which brings new opportunities for the development of new generation information technologies such as cloud computing, big data, mobile Internet, etc, It may also be able to trigger a new round of technological innovation and instrial change. Open source communities, instry alliances, backbone enterprises, start-ups, investment institutions, financial institutions and regulators are the participants in the development of blockchain technology and applications
as we all know, blockchain technology is first used in the financial field. The identity of blockchain is a decentralized distributed ledger database. Its features of transparent information, secure data storage and transaction process without any intermediary platform are particularly outstanding in this field, especially for supervision, anti-counterfeiting and improving processing efficiency... Blockchain technology seems to be full of unlimited possibilities

in China, financial enterprises, Internet enterprises, it enterprises and manufacturing enterprises also actively participate in the research and development and application promotion of blockchain technology, which makes the development momentum of blockchain rapid. For example, SF Express has been developing and deploying blockchain medicine traceability and UAV medicine transportation services in the field of medicine logistics, and recently it has officially realized the implementation of blockchain medicine traceability
however, no matter how great the role of blockchain is, when a new event or concept appears, we should pay more attention to all aspects of things. You know, the concept of blockchain was born in 2009 with the emergence of bitcoin, and it was not until around the beginning of 2018 that blockchain was graally known in China, and then Alibaba, Internet, thunderbolt and other large enterprises joined in one after another. It took nine years to develop the business that blockchain technology can support, but it seemed to burst out suddenly in 2018, It can even be said that it is the same as the outbreak without warning. Therefore, investors should be alert, and consider carefully whether to invest or not in combination with China's national conditions, social development degree and other factors, when China's domestic blockchain technology is just starting and immature
what blockchain technology can't do is first created by immature technology. At least in China, when blockchain is just emerging, the technology platform is not as good as that of foreign countries, and the business supported by technology should not be widely launched. The technical personnel applying blockchain should be patient, learn more advanced experience, and do things in detail
secondly, blockchain technology cannot regulate the fair, fair and effective operation of blockchain market. For example, as soon as blockchain technology has entered China, there are many fraudsters with the name of blockchain. They raise money and make money. It is difficult for the public to judge the difference between "technological innovation" and "fund-raising innovation", so they are easy to be cheated. Therefore, in the case of blockchain, it's up to time to make the technology independent and controllable and adapt to a variety of scenarios; If we want to make its value controllable, or give full play to its maximum value, it is decided by the supervision of government organizations, regulatory departments, experts and so on
even though the possibility of blockchain technology is infinite, the instry and market under it are in chaos frequently. If we do not list them one by one, there are still too few places that blockchain can "manage". In terms of how to correctly use blockchain technology to do what it should do, people should not be confused first, which shows that the whole society has a long way to go.

8.

Blockchain technology exchange

when blockchain technology is generally regarded as a technology in the market, the blockchain team of ant financial services technology laboratory gave a calm explanation: blockchain technology itself is not a special technology, but is integrated by many previous technologies, such as P2P network, many nodes, cryptography, It also includes something similar to consensus. So from this point of view, if we only use the previous technology, we will graally form the blockchain technology in the end

9. Transaction transparency should be more secure. No one can make trouble. The blockchain will record all the information and change everything. It will kill the fraudsters.:)