Us blockchain Technology

1. First of all, we can take a look at the official website explanation of blockchain technology. In a narrow sense, blockchain is a kind of chain data structure that combines data blocks in a sequential way according to the time sequence, and it is a distributed account book that can not be tampered with and forged by means of cryptography
broadly speaking, blockchain technology is a new distributed infrastructure and computing paradigm, 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
as we all know, blockchain technology is an independent underlying architecture from bitcoin system. From the perspective of architecture model, it is a set of distributed ledger, which is naturally used for bookkeeping
in the blockchain technology, if you want to generate accounting records, you need to have the transaction and flow of funds. Therefore, in the initial blockchain technology, the cryptocurrency corresponding to the main network is used as circulation goods, and the circulation transaction records of cryptocurrency between the accounts of the main network of the blockchain will be recorded on the main network
different from other transaction record databases, transaction records on the main network of blockchain technology will be recorded on all block nodes (i.e. all data blocks) in the main network, which is the so-called decentralization principle. That is to say, in blockchain technology, there is no central database to store all records, Every block on the chain has the transaction data of the whole chain, that is to say, every data block is the center
another feature of blockchain technology is that it can't be tampered with, because every transaction on the blockchain will be recorded in all blocks on the chain, so no single data block can change the record. Even if you change it, all other data blocks will also record real data, and each group of data can be traced back to the first time
because of these characteristics of blockchain technology, after the advent of bitcoin, blockchain has also attracted a lot of attention, and many people also began to want to use blockchain technology to make a centerless, traceable and unchangeable data, so as to ensure the credibility of the data
however, blockchain technology also faces many problems, such as single application scenario, non modifiable original error data, non recoverable currency stolen by hackers, etc.

2. All departments in the United States actively strive to lay out blockchains. The Department of justice held a digital currency summit. The stock exchange has approved the company's stock trading on the blockchain. The commodity futures trading commission of the United States regulates the blockchain and treats bitcoin as a bulk commodity; In addition, the UK released distributed ledger Technology: beyond blockchain; Russia put forward "block chain technology development roadmap"; Australian central bank wants to issue data currency; Japan held a special research conference on blockchain; The Central Bank of Korea issued the status quo and Enlightenment of distributed ledger technology and digital currency< On January 20, 2016, the Central Bank of China said that it would launch legal digital currency as soon as possible; In July of the same year, the Ministry of instry and information technology issued the letter on organizing and carrying out research on the development trend of blockchain technology and application; On August 11, the Ministry of instry and information technology issued a two-year plan for blockchain.

3. The most important thing of blockchain is to solve the problem of intermediary credit. In the past, it was difficult for two people who didn't know and trust each other to reach cooperation, and they had to rely on a third party. For example, in the past, there must be a bank or an institution such as Alipay. However, through the blockchain technology, bitcoin is the first time for human beings to complete the transfer behavior that can be trusted by both parties without the participation of any intermediary. This is a major breakthrough in blockchain
Yao Yudong, director of the Financial Research Institute of the people's Bank of China, once bluntly said: "he was born on the Internet and died on the blockchain." In order to warn those traditional financial institutions and Internet giants who are not sensitive to blockchain technology.

4. The difference is that the four detection methods use different technologies,
ut ultrasonic, a small instrument is simple and convenient, but the technical level of the operator is high, and it can detect internal defects
mT magnetic powder needs a magnetic powder machine, which is bulky and needs AC power supply, so it is inconvenient to construct
Pt penetration is more convenient than ultrasonic. It can only detect surface defects with cleaning agent, colorant and imaging agent
there are X-ray and gamma ray elements in RT. the former is less radioactive, and the latter will involve radioactive pollution with high risk coefficient. However, RT is also a method with accurate detection and the most direct evidence (X-ray film), so it is commonly used.

5. Who can say, how about mining? Mining refers to the use of bitcoin mining machine to obtain bitcoin, that is, the computer used to earn bitcoin. If you can get bitcoin, you can make money. This kind of computer generally has professional mining chips, and works by installing a large number of graphics cards, which consumes a lot of power. The computer downloads the mining software and then runs a specific algorithm to get the corresponding bitcoin after communicating with the remote server< First, the principle of Mining:
1. As long as there is a computer that can access the Internet and download the bitcoin program from the bitcoin website, the first run will generate a digital account, and then keep running, the program will continuously calculate a series of "mathematical problems". When you have successfully calculated "a mathematical problem", the, It's possible to get a certain amount of bitcoin
2. Bitcoin is a P2P network. To keep the network running, it is necessary to keep someone uploading and sharing data to others online. Bitcoin network needs someone to contribute computer resources for computing to ensure the operation of bitcoin network. Therefore, bitcoin is designed that whoever contributes computing power to keep the network running can get the fee paid by the network bitcoin< Second, mining security mechanism:
Mining creates a competition mechanism equivalent to lottery, and it is very difficult for anyone to continuously add new trading blocks to the block chain. This mechanism can prevent any indivial from obtaining the ability to freeze certain transactions, thus ensuring the neutrality of the network. This mechanism can also prevent any indivial from replacing part of the block chain to rece their own costs
precautions:
1. It's better to do DIY mining machine by yourself, from purchasing accessories to assembling, and then to mining software, to learn, focus, practice and graally understand the blockchain
2. Mining is actually a fixed investment process: regardless of the currency price, a certain amount of positions will be increased every day
3. The bitcoin wallet used to store bitcoin uses military level encryption, which makes it impossible for hackers to steal easily. Bitcoin wallet also allows users to set two passwords, a public account password and a private password. The user of public account password is to let the user receive bitcoin. If users want to withdraw or transfer bitcoin from their accounts, they need to use a private password.

6.

According to the information released by the South Korean Intellectual Property Office (KIPO), the number of patent applications for blockchain has increased significantly worldwide

the South Korean Intellectual Property Office released a report on Wednesday (March 21), which showed that the number of patent applications for global blockchain reached 1248 in 2017, and the top five countries and regions were the United States, the European Union, China, Japan and South Korea

7.

1、 Blockchain technology concept

blockchain technology is a new technology with the graal rise of encrypted digital currency. It adopts a distributed computing mode, uses blockchain to store data, uses cryptographic principle to ensure the security of transmission and access, and the data storage is jointly maintained and supervised by Internet users, with decentralized, transparent and open functions Data can not be modified and other significant features [2]. Its use of distributed storage and computing power makes the rights and obligations of the entire network nodes the same. The nature of data in the system is the common maintenance of the whole network nodes, so that the blockchain no longer relies on the central processing node to achieve distributed storage, recording and updating of data. Therefore, its application is not limited to currency as an asset type, At present, it is widely used in various instries{ RRRRR}