Blockchain understanding

1. The definition of Chongqing jinwowo analysis blockchain technology is as follows:
1. Blockchain is a distributed database (system) placed in a non secure environment
2. The blockchain uses cryptography to ensure that the existing data cannot be tampered with
3, the blockchain uses consensus algorithm to reach consensus on new data
the system with the above three properties is blockchain.

2. In essence, blockchain represents a transformation from monopoly of technical authority to decentralization, that is, a distributed concept“ Blockchain has three characteristics: tamper proof, whole process recording and encryption system, which can make the right of data more democratic, "said the above-mentioned person in charge of jinwowo group. By solving the problem of data ownership right, jinwowo blockchain has built a large number of blockchain digital asset networks with rich asset types, Its overall architecture has covered the entire southwest region“ With the increasing maturity of blockchain technology, jinwowo will be distributed throughout the country, dedicated to the Internet technology service platform of comprehensive collection, efficient storage, in-depth analysis of big data for the majority of small and medium-sized enterprises, and ultimately promoting the legal sharing and value circulation of big data

3. It's essentially a document. You can think of it as a notepad or word file, which records the transaction records of many people. It's just that the Notepad will be uploaded to the network through P2P, and another person can download the notepad with seed (the same thing as Xunlei). For a long time, everyone has such a notepad. If someone wants to make fake data, others will jump out and say that the data is fake. And there's an algorithm that makes it hard for you to make a fake data (POW)

by the way, it's not a panacea, nor is it

4.

blockchain is a decentralized distributed ledger database . The advantage of this distributed ledger is that buyers and sellers can trade directly without any intermediary. Everyone has a backup, even if you lose this, it will not be affected

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extended data:

blockchain application field

1, financial field

blockchain has potential huge application value in international exchange, letter of credit, equity registration, stock exchange and other financial fields. The application of blockchain technology in the financial instry can save the third-party intermediary link and realize the point-to-point direct docking, so as to greatly rece the cost and quickly complete the transaction payment

2. The Internet of things and logistics

blockchain can also be naturally combined in the field of Internet of things and logistics. Through blockchain, we can rece logistics costs, trace the proction and delivery process of goods, and improve the efficiency of supply chain management. This field is considered as a promising application direction of blockchain

3. The data stored on the public welfare field

blockchain is highly reliable and tamperable, which is naturally suitable for social public welfare scenarios. The relevant information in the public welfare process, such as donation project, collection details, fund flow, recipient feedback, etc., can be stored on the blockchain, and can be made transparent and public, which is convenient for social supervision

4. In the field of insurance

in terms of insurance claims, insurance institutions are responsible for fund collection, investment and claims settlement, and often have higher management and operation costs. Through the application of smart contract, there is no need for the applicant to apply or the insurance company to approve. As long as the claim conditions are triggered, the automatic claim settlement of the policy can be realized

5. EM is a relative measure

EM is a measure based on typesetting conversion, which defines 1em as the height of capital letters of reference font. For consistency with other metrics, CSS defines 1em as the height of the character box. The size in EM is a decimal or multiple of the reference font size. Therefore, 2em and 200% are the same, and. 75em and 75% represent the same size

you write 2em, which is 200%. Of course, you can't see the effect. If you use 0.2em, you can see the effect.

6. The simple one is that e-money is not the traditional cash, but the transaction of data and data. No matter how you transfer or how you trade, the cash is in the bank, and the bank's money is invested, which is very helpful to the economic development and the dominant direction of money in the future. However, there are also shortcomings. E-money is very easy for the financial sector to cause economic bubbles. The same financial effect is doubling the financial effect. That is to say, funds have a circulation function in numbers, but in terms of banks, the cash they are holding has an additional effect on the circulation of electronic money in the society. It will inevitably rece the circulation of cash and RMB in the market, which will easily lead to inflation and price rise.

7.

At present, with the rapid development of science and technology, the situation is surging. If you and I are a little lazy, we may be out. No, the new blockchain is coming. Since the beginning of this year, blockchain has become one of the hottest knowledge points in the field of science and technology, and has become increasingly prominent in the fields of digital finance, Internet Governance and big data computing

blockchain technology also has broad application prospects in the military field, which is very likely to quietly subvert the future war

this is not Xiaole's boasting“ There is nothing more important about the three armed forces than secrecy. " We should know that in the future information battlefield, confidentiality is the key to win or lose the war. Because the blockchain system has many characteristics such as information independence, confidentiality and integrity, it can realize the perfect combination of data storage and data encryption. After being attacked, it also has strong recovery ability, and can protect highly sensitive data, which is of great help to win the war

according to the information collected by Xiaole, some countries are planning to build blockchain information platform and begin to study the application potential of blockchain in several scenarios such as military satellites and nuclear weapons; An international organization is currently evaluating the performance of blockchain technology in military logistics, Internet of things and other fields

if bitcoin and other digital currencies are blockchain 1.0 applications, blockchain 2.0 is the "smart contract" that provides a strong guarantee for network transaction data security. There will be 3.0 in the future, from Dao (blockchain self consistent organization), DAC (blockchain self consistent company) to blockchain society

"cultivate new kinetic energy with informatization, promote new development with new kinetic energy, and create new brilliance with new development." I believe that blockchain, the "new kinetic energy" of science and technology, will bring us more surprises: "one machine in hand, I have it in the world", "trade autonomy", more extensive sharing, and the optimal life mode... Blockchain technology will create a more honest, convenient, and efficient Era of big data

content source: Liberation Army Daily

8. Blockchain is an important concept of bitcoin. It is the underlying technology and infrastructure of bitcoin. It is a new application mode of distributed data storage, point-to-point transmission, consensus mechanism, encryption algorithm and other computer technologies
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
in a word, it is a special distributed database<

a very important understanding is to decentralize

in the world of blockchain, there is no central node, every node is equal, and the entire database is kept, and any reading is parallel and transparent
there is no administrator in the blockchain, and the blockchain format was first applied to bitcoin as a solution to make the database secure without the need for administrative credit
so how does TA achieve anti-counterfeiting

blocks and hash are one-to-one correspondence. If someone modifies a block, the hash of the block will change
so TA is the only one
the machine that calculates hash is called a miner, and the person who operates the miner is called a miner
the block head contains a difficulty coefficient, which determines the difficulty of hash calculation
about one billion calculations are considered to be a fair one<

blockchain mainly solves the trust and security problems of transactions, so it proposes four technological innovations to solve this problem:
the first one is called distributed ledger, which is that transaction bookkeeping is completed by multiple nodes distributed in different places, and each node records complete accounts, so they can participate in monitoring the legitimacy of transactions, At the same time, they can testify together. Different from the traditional centralized accounting scheme, no single node can record accounts separately, so as to avoid the possibility that a single bookkeeper is controlled or bribed to record false accounts. On the other hand, because there are enough accounting nodes, in theory, unless all nodes are destroyed, the accounts will not be lost, thus ensuring the security of the account data
the second is called asymmetric encryption and authorization technology. The transaction information stored on the blockchain is public, but the account identity information is highly encrypted, which can only be accessed under the authorization of the data owner, thus ensuring the data security and personal privacy
the third mechanism is called consensus mechanism, which is how to reach a consensus among all accounting nodes to determine the validity of a record. This is not only a means of identification, but also a means of preventing tampering. Blockchain proposes four different consensus mechanisms, which are suitable for different application scenarios and achieve a balance between efficiency and security. Taking bitcoin as an example, the workload proof is adopted. Only when more than 51% of the accounting nodes in the whole network are controlled can a nonexistent record be forged. When there are enough nodes to join the blockchain, this is basically impossible, thus eliminating the possibility of fraud
the last technical feature is called smart contract, which is based on these trusted and tamperable data and can automatically execute some pre-defined rules and terms. Take insurance as an example. If everyone's information (including medical information and risk occurrence information) is true and reliable, it is easy to carry out automatic claim settlement in some standardized insurance procts

a man signed by Nakamoto Tsung has put forward a revolutionary idea: let's create a currency that is not controlled by the government or anyone else
--- the origin of bitcoin
the application prospect of blockchain technology is very wide, especially in the financial field of digital currency, cross-border payment and so on. According to previous news, the Central Bank of China is expected to become the first central bank to develop digital currency and carry out real application
three five Internet: the company and CICC online have signed a letter of intent to jointly carry out the bitcoin project, and the blockchain technology is the core of bitcoin
Hang Seng electronics is trying to build a digital bill system based on alliance chain by using blockchain technology
Feitian integrity: the company once said in the interactive platform that it has a certain technical reserve and research in blockchain technology. The company will actively participate in digital currency and other blockchain technology instries in the future
win time win: on April 11, the company said on the investor relations interactive platform that it has technical reserves in this field, but it is in the initial stage
from the current situation, the vast majority of blockchain technology applications of Listed Companies in China are still in the research stage, and the implementation and promotion of projects still need time to test.