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① An introduction to the principles and applications of blockchain technology

1. Blockchain is a series of data blocks generated by using cryptographic methods. Each data block Contains the information of all Bitcoin network transactions in the past ten minutes, used to verify the validity of the information (anti-counterfeiting) and generate the next block. It is the underlying technology of Bitcoin, like a database ledger that records all transaction records.

2. Broad definition: Use encrypted chain structure to verify and store data, use distributed node consensus algorithm to generate and update data, use automated script code (smart contract) to convert and operate data A new decentralized infrastructure and distributed computing paradigm.

3. Narrow definition: A decentralized shared account that combines data blocks into a specific data structure in a chain in chronological order, and is cryptographically guaranteed to be non-tamperable and non-forgeable.

4. Characteristics of blockchain: Decentralization: The processes of verification, accounting, storage, maintenance and transmission of blockchain data are based on distributed system institutions and use pure mathematical methods. It is not a central structure to establish trust relationships between distributed nodes, thereby forming a decentralized and trustworthy distributed system.

5. Time series data: Blockchain uses a chain block structure with timestamps to store data, thereby adding a time dimension to the data and having strong verifiability and traceability.

6. Collective maintenance: The blockchain system uses a specific economic incentive mechanism to ensure that all nodes in the distributed system can participate in the verification process of data blocks, and select specific nodes through a consensus algorithm Add new blocks to the blockchain.

7. Programmable: Blockchain technology provides a flexible script code system to support users in creating advanced smart contracts, currencies or other decentralized applications.

8. Safe and trustworthy: Blockchain technology uses asymmetric cryptography principles to encrypt data, and at the same time relies on the powerful computing power formed by consensus algorithms such as workload proof of each node in the distributed system to resist external forces. Attack and ensure that blockchain data cannot be tampered with and cannot be forged, so it has high security.

9. Blockchain application scenarios: Digital currency: represented by Bitcoin, it is essentially a digital currency generated by a distributed network system. Its issuance process does not rely on a specific centralized institution.

② What is blockchain and its application in the automotive field

1. The decentralization, transparency and trust of blockchain technology are to solve the current problems in the automotive industry Problems such as leakage of user privacy, poor dispersion of maintenance services, and irregularities have brought opportunities. The key to the application of blockchain in the automotive field lies in the construction and integration of car identity and user credit systems to create car logos, completely record key information during the manufacturing and use process of cars, and promote the traditional car industry.Standardize the industry chain, establish a reliable service platform quality control system and optimized inventory dynamic management for car companies to provide users with better repair, maintenance and second-hand car trading services. Combining car identity and personal credit, it is connected to the blockchain system and can transform the original car sharing business process. In the future, blockchain, as the underlying technology, will be combined with edge technologies such as the Internet of Things and big data to achieve safe interconnection of different smart devices, continuously improve the processing capabilities of blockchain technology, and accelerate its development in the fields of autonomous driving and intelligence. application.

3. Blockchain system information transparency, tamper-proof, and forgery can effectively solve this problem, which will have an impact on the financial Internet of Things, supply chain, government services and other fields. deep influence. Due to its transparent, reliable and traceable characteristics, blockchain technology can build a car identity and completely record the source of car parts and production processes, sales channels, use and maintenance, vehicle positioning and other data to promote into the traditional automotive industry chain. "Production, supply and marketing after market" standards. At the same time, a tamper-proof and securely encrypted user credit system can be built through the blockchain to record, store, and integrate user online transaction information and credit evaluations such as asset information, user information, and user behavior. Because the application of car retail, leasing, sharing and other scenarios is essentially an extension of the personal credit system, the blockchain system will eventually bring information such as identity, user credit and service history to owners through the blockchain system, which will be associated with car identities to improve the security of interconnection. to realize the application of blockchain autonomous driving in fields such as Internet of Vehicles and vehicle sharing.

③ What is blockchain

Blockchain is a new application model of computer technology such as distributed data storage, point-to-point transmission, consensus mechanism, and encryption algorithm. Blockchain is an important concept of Bitcoin.

It is essentially a decentralized database. As the underlying technology of Bitcoin, it is a series of data blocks generated using cryptographic methods. Each data block contains a batch of The information of Bitcoin network transactions is used to verify the validity of its information (anti-counterfeiting) and generate the next block.

(3) Extended reading of shared parking space lock blockchain

Characteristics of blockchain:

1. Deposit certificate< /p>

The "non-tamperable" feature of blockchain provides a solution to the problem of "certificate storage" in economic and social development. As long as the authenticity of the on-chain information and data can be ensured, the blockchain can solve the problem of "storage" and "certification" of information.

For example, in the field of copyright, blockchain can be used to store electronic evidence, which can ensure that it is not tampered with, and can link original platforms, copyright bureaus, judicial agencies and other parties through distributed ledgers, which can greatly Improve the efficiency of handling infringements.

2. Sharing

The "distributed" characteristics of the blockchain can break through the "data barriers" between departments and achieve information and data sharing. Unlike centralized data storage, the information on the blockchain isIt will be distributed to every node through point-to-point broadcasting, and all information will be "truthfully recorded" through "whole network witness".

④ What is the principle of smart parking system

Smart parking system will inevitably become a major trend in the future. The specific principles are as follows:
1. The parking lot is installed with geomagnetic induction (parking induction) to connect the smartphone entering the parking lot.
2. Establish an integrated parking lot backend management system and integrate real-time data from major parking lots.
3. Realize intelligent services such as automatic parking navigation and online payment of parking fees in the parking lot, and fully deploy a fully automated parking management system to rationally divert traffic flow.
Currently, Dimeng Intelligent Transportation System relies on Dimeng Technology’s rich development experience and strong technology accumulation in the fields of cloud computing, Internet of Things, big data, financial technology and other fields. It already has relatively mature system assistance in smart parking.

⑤ What is the meaning of blockchain?

Blockchain is a shared database. Blockchain is a combination of distributed data storage, point-to-point transmission, consensus mechanism, encryption algorithm and other computer technologies. New application models.

Blockchain does not belong to any industry. Blockchain is a new application model of computer technologies such as distributed data storage, point-to-point transmission, consensus mechanism, and encryption algorithm. In a narrow sense, blockchain is a chained data structure that combines data blocks in a sequential manner in chronological order, and is a cryptographically guaranteed distributed ledger that cannot be tampered with or forged.

Features

Decentralization. Blockchain technology does not rely on additional third-party management agencies or hardware facilities, and there is no central control. In addition to the self-contained blockchain itself, each node realizes self-verification, transmission and management of information through distributed accounting and storage. Decentralization is the most prominent and essential feature of blockchain.

Openness. The foundation of blockchain technology is open source. In addition to the private information of the transaction parties being encrypted, the data of the blockchain is open to everyone. Anyone can query the blockchain data and develop related applications through the public interface. Therefore, the entire System information is highly transparent.

⑥ Is 2022 a good time to buy a house? Do you have any plans to buy a house?

First of all, it is uncertain what will happen to China’s housing prices in the future.

Overall, in the next 2-5 years, the first and second tiers will fall by 15%, and the third and fourth tiers will drop by 30%. It is a high probability event. The first and second tiers have low holding costs, while the third and fourth tiers have limited purchasing power.

Nowadays, the leverage of residents is too high, and it is difficult for the government to increase wages even if the government releases funds. Basically, it is transferred to Leeks in the form of leveraged credit. The current situation is really unbearable. In the past few years, almost everyone who has enough basic money to make a down payment has bought a car. It is really dangerous to double the down payment.

Do the third and fourth tiers want to sell land? Of course they do. Is there a shortage of land? There is certainly no shortage. The new areas are all filled with land. The key is that this liability is not transferred to home buyers. The government’sThe money from selling the land is money from the bank. Again, there are too many stocks and I really can’t pick up the leeks. Recently, there have been more and more failed land auctions, and it is urgent to supplement finance with property taxes.

The essence of the first and second lines is the same, but the situation is slightly better, because the belief and holding cost are too low, and the two sides are still in a stalemate. Shenzhen and Shanghai restricted loan quotas, transaction volume dropped instantly, and the so-called big guys who bought the houses they just needed with full payment disappeared.

The introduction of the property tax has completely changed this equilibrium state. The guide price is obviously prepared for the property tax. Otherwise, who else would be so tired to give a guide price to each community. If the real estate tax pilot is implemented quickly, it will be by the end of the year. If it is slow, it will be next year. It will definitely be launched. It will not be as harsh as everyone thinks, and it will not be like Shanghai and Chongqing before. Sell ​​the land when it is time to do so without delaying property taxes. After all, there will be a transition time, and the ratio between the two will be dynamically adjusted. At the same time, state-owned developers began to develop public rental housing. The country has many options for building public rental housing: a large number of vacant office buildings in the city center have been renovated, have good locations, and are endorsed by the state. It just depends on whether the country is willing or not. As the holding cost goes up, first-line housing prices will definitely loosen, but after all, if the first-line housing prices decline for a few years, a 15% drop is acceptable, and it will just go back to around 2019. So I personally feel that the first and second tiers will be an excellent low point to get started in 2-3 years.

It is estimated that it will take 2-3 years before the third and fourth tiers are fully levied, but if we have expectations, we will not be afraid of rising prices. The bubble in the third and fourth tiers is still quite serious. A 30% drop is considered good, but it may be cut in half directly.

This time we look at the determination and means to deal with double reductions. It feels really different.

Finally, no matter whether you buy it or not, just pay attention to the leverage. Yesterday I saw a post about buying a house in Chengdu, draining the down payment of both parents and borrowing foreign debt. It's so dangerous. Many people born in the 1990s have not realized that their parents' bodies are getting weaker day by day, and people will get sick as they get older. Being sick costs a lot of energy and money.

⑦ What changes can blockchain bring to data sharing

What changes can blockchain bring to data sharing
Currently, text and text are shared on social networking sites Taking photos and sharing each other's joys, sorrows and joys has become an important part of public life.
With the progress of the times, sharing is gradually entering the real society. A series of shared economic models such as shared bicycles, shared umbrellas, shared power banks, and shared cars have emerged, bringing great convenience to human life. .
As a distributed shared ledger, blockchain technology seems to be inherently inseparable from sharing, and industry insiders continue to claim that this technology can bring revolutionary progress to sharing.
So, what is the difference between blockchain-based sharing and Internet-based sharing? This article takes data sharing as an example to answer this question.

Blockchain shares more than just data
Data sharing is an innate need of human beings. For example, talking about life ideals in a cafe, writing text, etc., these are all Used by ordinary people to communicate with othersimportant way of information.
The emergence of the Internet has broken the geographical and time limitations of data sharing. It allows different people to communicate instantly in different locations on the earth. The emergence of email, online instant messaging and other technologies has greatly improved the efficiency of information transmission. efficiency.
In addition, the Internet can collect massive amounts of data, providing a larger capacity than paper archives, allowing users to obtain rich information in a short period of time.
So, how is all this different under blockchain technology?
In fact, blockchain technology is not concerned with the sharing of data, but the sharing of data control permissions. The permissions here mainly refer to the power to modify and increase data. It mainly contains two meanings:< br />One is who can modify the data
The other is how to modify it.
In the Internet model, data reading, writing, editing and deletion are generally accompanied by identity authentication operations. Only specific people can modify the data. In the blockchain model, especially the public chain system Under this system, anyone can participate in reading and writing data, and a trustless system is built in the form of a distributed ledger. The various organizations or individuals participating in reading and writing can not trust each other, but can store the final status of the data in the system. Reach a consensus.
To put it simply, the essential difference between blockchain-based sharing and Internet-based sharing is that blockchain shares not just data, but the control of data. So, how exactly does blockchain handle data control?
Blockchain controls data through rules
Before the emergence of blockchain technology, Internet data was usually controlled by a single entity. Since the website operator has complete control over the central server, these organizations can edit and process the data at will. Although organizations also need to complete data modification and other behaviors under certain laws and agreements, because they are the party that controls the resources, it is difficult for individual users to enjoy complete control.
To give a simple example, a user uploads a photo to the website platform and hopes that friends can see the photo. Excluding some illegal elements, who has the final control over this photo?
Obviously, from the user's point of view, this photo belongs to them, but in fact, these social networking sites are the real controllers. They can modify it at will, but users have nothing to do.
In other words, under the existing Internet system, as long as you have the right to operate the website platform, you can completely control the data on the platform.
Under the blockchain system, data is not controlled by any authoritative party, and its authority is controlled by rules. The main goal of these rules is to stipulate what kind of information is valid, and also stipulates How participants should provide feedback on it.
These rules are usually pre-defined and participants joining the blockchain network must abide by the rules. Of course, technically speaking, participants can ignore certain rules and construct invalid data based on their own interests. butYes, due to the existence of the blockchain consensus mechanism, other participants can exclude these invalid data from the network based on predefined rules.
For example, in the blockchain blacklist sharing platform system launched by Suning Financial, there are many such rules-no data can be queried without points, only the organization has the authority to modify the data of this organization, etc. Once an institution performs an operation outside the rules, these operations will be regarded as invalid transactions and are prohibited from occurring.
In general, blockchain regulates data writing behavior based on a technical rule system, while the Internet controls data through power and resources. This is the foundation of blockchain-style sharing and Internet-style sharing. sexual distinction.
Blockchain rules are jointly maintained by participants
Although there are some rules in the Internet environment, because the rules are completely maintained by the power parties, it is difficult to avoid black-box operations and other behaviors. In the blockchain system, the rules are jointly maintained by all participants, and each participant will independently verify the data according to the rules.
In this process, we cannot assume that all participants can fully comply with the rules. Therefore, each participant will independently verify the data it receives and determine whether it violates the rules. If the verification data is valid, then the participant will accept the data and forward it to others, otherwise, it will be rejected directly.
Within the blockchain network, new data can be considered valid data and added to the final blockchain shared ledger only when relevant participants agree.
Depending on how the blockchain is constructed, there are big differences in how data is confirmed. For example, in a public chain, most participants need to agree on the validity of the data, while in a consortium chain or private chain, Only a few participants need to agree.
In this method, the participants themselves are the managers, which is the core expression of blockchain decentralization: no institution is superior to others and has complete control authority over the data.
Blockchain is a form of permission sharing, allowing each participant to serve as a data provider, verifier and user at the same time, jointly maintaining the security and validity of blockchain data.
Since the popularity of blockchain, blockchain for everything seems to have become the advertising slogan of the industry, especially some data sharing applications are considered to be excellent examples of blockchain.
In fact, the emergence of the Internet has solved the problem of data sharing to a certain extent. Blockchain realizes the sharing of permissions. This is the most revolutionary change that blockchain has brought to the industry.