区块链信息存储在哪里,区块链传播机制

区块链信息存储在哪里？这是一个很重要的问题，它与区块链传播机制有着密不可分的关系。以下将介绍三个相关关键词：节点、共识机制和区块链浏览器。

节点

区块链的节点是指节点网络中的每一台计算机，它们共同参与区块链的运行，每一台节点都可以存储、处理和传播区块链上的数据。节点的主要作用是负责网络的管理，确保网络的稳定性和安全性。节点也可以帮助用户了解区块链的最新状态，并参与区块链的共识机制。

共识机制

区块链的共识机制是指网络中的节点之间通过一种特定的算法来达成一致的机制。这种机制可以确保网络中的数据的安全性和可靠性，并使网络中的数据能够被安全地存储和传播。常见的共识机制有工作量证明（Proof of Work）、权益证明（Proof of Stake）和拜占庭容错（Byzantine Fault Tolerance）等。

区块链浏览器

区块链浏览器是一种特殊的应用程序，它可以帮助用户查看区块链上的所有信息，包括交易记录、账户余额、区块高度等。它可以帮助用户了解区块链的运行状况，并可以查看区块链上的每一笔交易。此外，区块链浏览器还可以帮助用户查看区块链上的智能合约，并可以发布新的智能合约。

总之，区块链信息存储在节点、通过共识机制保证数据安全性和可靠性，并可以通过区块链浏览器查看区块链上的信息。而这一切都是由区块链传播机制保证的。

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㈠ What is blockchain and how to introduce blockchain in a simple and easy-to-understand manner

Many people don’t know what blockchain is. Here I will give you a detailed introduction. Blockchain is a new technology that subverts the old model. Just like people tend to ignore the invisible but indispensable oxygen, people often ignore the most important thing in the market economy, which is trust. Without trust, no transaction can be established.

In addition, different races, nationalities, cultures, religious beliefs, etc. will form a trust gap. Due to the lack of mutual understanding and necessary trust between strangers, transactions are difficult to occur. The market economy emerged in large numbers among strangers. The emergence and development of the market economy lies in the birth of a new mechanism, which solves the problem of trust between strangers.

The concept of blockchain was first proposed in a paper written by Bitcoin founder Satoshi Nakamoto in 2008. Blockchain can be understood as a kind of public accounting. Technical solution: All data will be open and transparent, without the need for a central server as a trust intermediary, thus ensuring the authenticity, immutability and credibility of information on a technical level. The immutability of data is very important.

Because the blockchain has the technical characteristics of large-scale expansion, open and transparent data, and because the data of each client is consistent, even if some clients are destroyed, it will not affect the reliability of data security. In particular, it can effectively solve the problem of trust between strangers, so this technology can be extended to all areas that can be digitized, such as digital currency, payment settlement, digital bills, proof of rights, credit information, government services, medical records, etc. If blockchain technology develops, it will be closely related to everyone in the future.

㈡ A brief analysis of the application of blockchain technology

Today we will talk about the application analysis of blockchain technology in the field of public resource transactions
Public resource transactions include both The purchase of public resources by the public sector, such as government procurement, construction project bidding, etc.; also includes the sale of public resources by the public sector, such as the bidding, auction and listing of state-owned land, the transfer of mining rights, the sale of state-owned forest rights, and the disposal of state-owned financial assets and other public resource sales behaviors involving public interests and public safety. Public resource transactions are related to the national economy and people's livelihood, and involve the fundamental interests of the people. Therefore, public resource transaction management has always been an important management function of my country's government affairs management.
In recent years, the National Information Center has continued to promote the construction of a public resource trading service platform, giving full play to the role of a public entrance to trading services, a public channel for data sharing, and comprehensive technical support for cross-regional transactions. The integration of public resource trading platforms based on digital technology has achieved remarkable results. Among them, blockchain technology has the characteristics of consistent data storage, difficulty in tampering, and traceability. It provides new ideas and solutions to solve the problem of trust in public resource trading data. path.

Information data management issues in the field of public resource transactions

Objectively speaking, there have long been various credit deficiencies in the field of public resource transactions in my country.It not only disrupts the normal market transaction order and affects the fairness and justice of market competition, but also poses serious risks and threats to the quality of project construction and construction safety production. The reason is that the root cause of credit risk lies in the information asymmetry between entities in the public resource trading market, and in the limitations and defects of traditional public resource trading management on information data security and information data use.

Data security management issues

Various transaction information and credit information in the field of public resource transactions contain huge value. Under the increasingly electronic development trend of domestic public resource transaction management and services, including electronic bidding user identity information, potential bidder information, bid evaluation committee composition information, bid document information, judges' bid evaluation information, and bid evaluation result information Various types of information security risks have increasingly become important issues affecting the efficiency, quality, and fairness of public resource transactions.
Traditional data security technology cannot effectively avoid security management problems such as leakage, tampering, and loss of various information data. Especially with some technical means, it is difficult to trace traces of relevant data operations, causing great trouble for data security management. .
Data sharing application issues
The main reason for the long-standing problems of various credit deficiencies and untrustworthy behaviors in the public resource trading market is that there are limitations in the sharing and application of relevant credit information of market entities.
On the one hand, a large amount of credit information of market entities has been deposited in various departments for a long time and has not been fully exploited;
On the other hand, the credit information of public resource trading market entities involves banks, public security, courts, housing There are many management departments such as construction, human resources and social security, taxation, etc. The long-standing phenomenon of "data islands" and "data fog islands" between different management departments hinders the efficient sharing and application of credit information in the public resource trading market.
Blockchain and public resource transaction information data management
According to the "China Blockchain Technology and Application Development White Paper 2016" issued under the guidance of the Ministry of Industry and Information Technology, in a broad sense, blockchain technology is the use of blocks Chained data structures are used to verify and store data, distributed node consensus algorithms are used to generate and update data, cryptography is used to ensure the security of data transmission and access, and smart contracts composed of automated script codes are used to program and operate data. A new distributed infrastructure and computing paradigm.
Essentially, blockchain technology is a technical solution that collectively maintains a reliable database in a decentralized, high-trust manner. In layman's terms, blockchain technology can be seen as an accounting method that supports the participation of all people.
Traditional data accounting involves multiple accounting entities and generates multiple data ledgers. Under this accounting method, due to the risks of lack of supervision, technical security risks, and physical security risks, the account data may be tampered with or lost, and it is difficult to trace relevant operational behaviors. Therefore, the objectivity, fairness, and security of the account data must be It’s hard to guarantee.
Blockchain technology providesA technical solution that supports multiple accounting entities to participate in accounting together. When any accounting subject modifies the ledger, its modification behavior will form indelible traces (timestamps) in the ledger records, and the modification results will be synchronized to the ledgers of all accounting subjects, which prevents the account from being The risk of data tampering and loss can be traced back to relevant accounting behaviors to promote supervision.

In response to the information data management and credit issues raised above in the field of public resource transactions, blockchain technology can use its own "decentralization", "distributed data storage" and "traceability" ”, “anti-tampering characteristics”, “openness and transparency” and other advantageous features to effectively respond and solve.
Public resource transaction data is tamper-proof
The public resource transaction platform stores a large amount of public resource transaction data. With traditional centralized data storage management, once the data and backup are damaged or lost, it is difficult to recover, and due to There are loopholes in the supervision mechanism and the risk of data tampering.
Blockchain technology adopts "decentralization" and "distributed data storage". Data damage or loss in one or more data storage nodes will not affect the data security of other data storage nodes. At the same time, updates to data ledger records are shared and made public simultaneously, and operations traces are supported. Blockchain data cannot be tampered with or corrupted unless all nodes are compromised.
Establishing a trustworthy public resource transaction data environment
Information asymmetry in the public resource transaction market leads to adverse selection and moral hazard among market entities, affecting the efficiency and quality of public resource transactions, and affecting the orderly operation of the public resource transaction market. develop.
Blockchain technology solves the problems of authenticity, security and openness of public resource transaction data, promotes the efficient sharing and application of credit information in the public resource transaction market, promotes the establishment of a trustworthy data environment for public resource transactions, and prevents and avoids Various credit risks provide trustworthy data decision-making support for market trading entities and regulatory entities

(iii) How does the blockchain transmit data?

Blockchain is a It is a chained data structure that combines data blocks in a sequential manner in chronological order, and is cryptographically guaranteed to be a distributed ledger that cannot be tampered with or forged. Broadly speaking, blockchain technology uses block chain data structures to verify and store data, uses distributed node consensus algorithms to generate and update data, uses cryptography to ensure the security of data transmission and access, and uses automated scripts to A new distributed infrastructure and computing paradigm that uses smart contracts composed of code to program and manipulate data.

㈣ Application aspects of blockchain

The main application scope of blockchain includes: digital currency, transaction settlement of financial assets, Digital government affairs, certificate storage and anti-counterfeiting data services and other fields. Blockchain is an orderly linking of data blocks. Each block is responsible for recording a file data and encrypting it to ensure the data.Database technology that data cannot be modified and forged.

Blockchain is essentially a distributed database system that uses cryptography technology for multi-party participation, joint maintenance, and continuous growth. It is also called a distributed shared ledger. Each page in the shared ledger is a block, and each block is filled with transaction records. The anonymity, decentralization, openness, transparency, and non-tamperability of blockchain technology make it highly favored by enterprises and has gained More extensive application attempts.

Blockchain application scope 1. Financial field

Blockchain can provide a trust mechanism and has the potential to change the financial infrastructure. Various financial assets such as equity, bonds, bills, warehouse receipts, fund shares, etc. It can be integrated into the blockchain technology system and become a digital asset on the chain, which can be stored, transferred and traded on the blockchain.

The decentralization of blockchain technology can reduce transaction costs and make financial transactions more convenient, intuitive and secure. The combination of blockchain technology and the financial industry will inevitably create more and more business models, service scenarios, business processes and financial products, thereby bringing more impact to the development of financial markets, financial institutions, financial services and financial formats. . With the improvement of blockchain technology and the combination of blockchain technology with other financial technologies, blockchain technology will gradually adapt to the application of large-scale financial scenarios.

2. Public service field

Traditional public services rely on limited data dimensions, and the information obtained may not be comprehensive enough and have a certain lag. The non-tamperable nature of the blockchain makes the digital certification on the chain highly credible. It can be used to establish new authentication mechanisms in the fields of property rights, notarization and public welfare, and improve the management level of public services.

Relevant information in the public welfare process, such as donation projects, fundraising details, fund flows, recipient feedback, etc., can be stored on the blockchain to meet the privacy protection of project participants and other relevant laws and regulations. Under the premise of requirements, public disclosure will be made conditionally to facilitate public and social supervision.

3. Information security field

Using the traceability and non-tampering characteristics of blockchain, we can ensure the authenticity of data sources and ensure the non-forgery of data. Blockchain technology will fundamentally change information Security issues of the propagation path.

Blockchain is reflected in the following three points in the field of information security:

User identity authentication protects data integrity and effectively prevents DDoS attacks

The distributed storage architecture of blockchain will make Hackers are at a loss as to what to do. Some companies have begun to develop a distributed Internet domain name system based on blockchain to eliminate the root cause of the current DNS registration shortcomings and make the network system cleaner and more transparent.

4. Internet of Things field

Blockchain + Internet of Things can allow each device on the Internet of Things to operate independently, and the information generated by the entire network can be protected through smart contracts in the blockchain.

Security: Traditional IoT devices are highly vulnerable to attacks, data loss and maintenance costs are high. Typical information security risk issues for IoT devices include low firmware versions, lack ofSecurity patches, permission loopholes, too many device network ports, unencrypted information transmission, etc. The blockchain's consensus mechanism for network-wide node verification, asymmetric encryption technology and distributed data storage will significantly reduce the risk of hacker attacks.

Trustability: The traditional Internet of Things is managed and controlled by a centralized cloud server. Due to the security of the device and the opacity of the centralized server, it is difficult to effectively protect user privacy data. The blockchain is a distributed account book. Each block is interconnected and has its own independent working ability, ensuring that the information on the chain will not be tampered with at will. Distributed ledgers can therefore provide trust, ownership records, transparency and communication support for the Internet of Things.

Effectiveness: Limited by cloud services and maintenance costs, the Internet of Things is difficult to achieve large-scale commercial use. The traditional Internet of Things realizes communication between things through centralized cloud servers. The disadvantage of this model is that as the number of access devices increases, the server faces more load, requiring enterprises to invest a lot of money to maintain the normal operation of the IoT system.

Blockchain technology can directly realize point-to-point transactions, omitting the labor expenditure of other intermediaries or personnel, which can effectively reduce the costs incurred by third-party services and maximize benefits.

5. Supply chain field

The supply chain consists of many participating entities, with a large amount of interaction and collaboration. Information is discretely stored in their own systems, lacking transparency. The lack of smooth information makes it difficult for various participating entities to accurately understand the real-time status and existing problems of related matters, affecting the collaborative efficiency of the supply chain. When disputes arise between parties, it is time-consuming and laborious to provide evidence and pursue accountability.

Blockchain can make data open and transparent among various entities, thereby forming a complete, smooth, and non-tamperable information flow throughout the entire supply chain. This can ensure that all entities promptly discover problems arising during the operation of the supply chain system and find targeted solutions, thus improving the overall efficiency of supply chain management.

6. Automotive Industry

Last year announced a partnership using blockchain to build a proof of concept to streamline the car rental process and build it into a “click, sign up, and drive” process. Future customers choose what they want The rented car enters the public ledger of the blockchain; then, sitting in the driver's seat, the customer signs the rental agreement and insurance policy, and the blockchain updates the information simultaneously. This is not an imagination, for car sales and car registration That said, this type of process may also develop into reality.

7. Stock Trading

For many years, many companies have worked to make the process of buying, selling, and trading stocks easy. Emerging Blockchain Chain startups believe that blockchain technology can make this process more secure and automated than any previous solution. At the same time, blockchain startup Chain is working with Nasdaq to enable private companies through blockchain. Equity transfer

8. Government management

Government information, project bidding and other information are open and transparent. Government work is usually subject to public attention and supervision, because blockchain technology can ensure the transparency and transparency of information.Unchangeability plays a great role in the implementation of transparent government management. There is a certain degree of information opacity in government project bidding, and companies also have the risk of information leakage during the sealed bidding process. Blockchain can ensure that bidding information cannot be tampered with, and can ensure the transparency of information, forming a shared trust among competitors who do not trust each other. And it can arrange subsequent smart contracts through the blockchain to ensure the construction progress of the project and prevent the growth of corruption to a certain extent.

There are many more applications of blockchain technology, and this is just a fulcrum of blockchain applications. In the future, blockchain technology will be applied in various places

㈤ What changes can blockchain bring to data sharing

What changes can blockchain bring to data sharing? What changes are coming
Currently, sharing text and photos on social networking sites, as well as 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 An important way for ordinary people to communicate information with others.
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. reachreach 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. However, 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 verified data is valid, then the participant will accept the data and forward it to others, otherwise, it will reject it 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.

㈥ What can the blockchain open up

Blockchain technology can open up the information channels of judicial, notarization, auditing, and arbitration institutions.
From the source of data to the fixation and encryption of evidence, every node in the entire data chain has evidence that can be obtained at any time, ensuring the tamper resistance and credibility of the data, and achieving the result that the evidence information has legal effect.
Blockchain is a chain composed of blocks one after another. Each block stores a certain amount of information, and they are connected into a chain in the order in which they were generated. This chain is saved in all servers. As long as one server in the entire system can work, the entire blockchain is safe. These servers are called nodes in the blockchain system, and they provide storage space and computing power support for the entire blockchain system. If you want to modify the information in the blockchain, you must obtain the consent of more than half of the nodes and modify the information in all nodes. These nodes are usually in the hands of different subjects, so it is extremely difficult to tamper with the information in the blockchain. thing. Compared with traditional networks, blockchain has two core characteristics: one is that data is difficult to tamper with, and the other is decentralization. Based on these two characteristics, the information recorded in the blockchain is more authentic and reliable, and can help solve the problem of people's mutual distrust. Blockchain is a chain 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. Generalized blockchain technology uses block chain data structures to verify and store data, uses distributed node consensus algorithms to generate and update data, uses cryptography to ensure the security of data transmission and access, and uses smart contracts composed of automated script codes. , programming and operatingA new distributed infrastructure and computing paradigm for data processing.

㈦ What do you need to obtain when transferring money to a certain person on the blockchain?

When transferring money to a certain person on the blockchain, you need to obtain the person’s address. When transmitting information in the blockchain, the address of the recipient is required, which is then encrypted using the received public key.

㈧ How to understand blockchain and blockchain technology

Blockchain technology uses mathematical methods to realize distributed accounting and solve trust issues, thus completing decentralization. It will have a profound impact in many fields such as communications, finance, Internet of Things, government management, etc.
Blockchain refers to a technical solution that collectively maintains a reliable database through decentralization and trustlessness. It is a technical method for all people to participate in accounting. The previous accounting methods were centralized and required a centralized intermediary, whether the intermediary was a traditional government, financial institution, notary agency or an emerging e-commerce platform or online payment platform.
In economics, information is sufficient. In fact, very large intermediaries exist precisely because of insufficient information. The existence of intermediaries increases transaction costs and raises transaction thresholds. Blockchain technology is essentially a large-scale collaboration tool. It uses pure technology to make direct value transfer possible for the first time, and continues the trend of decentralization and disintermediation of the Internet. Disintermediary blockchain technology will greatly subvert the information intermediary industry.
Blockchain technology is the basic technology for constructing the Bitcoin data structure and encrypted transmission of transaction information. This technology realizes the issuance and transaction of Bitcoin. The core of blockchain technology is that all currently participating nodes jointly maintain transactions and databases, making transactions based on cryptographic principles rather than trust, so that any two parties who reach an agreement can directly conduct payment transactions without the participation of a third party.
Technically speaking, a block is a data structure that records transactions, reflecting the flow of funds in a transaction. The blocks that have reached transactions in the system are connected together to form a main chain, and all nodes participating in the calculation record the main chain or part of the main chain.
A block contains the following three parts: transaction information, hash hash formed by the previous block and random number. Transaction information is the task data carried by the block, specifically including the private keys of both parties to the transaction, the number of transactions, the digital signature of electronic currency, etc.; the hash formed by the previous block is used to connect the blocks to realize the past The order of transactions; the random number is the core of the transaction. All nodes compete to calculate the answer to the random number. The node that gets the answer the fastest generates a new block and broadcasts it to all nodes for update, thus completing a transaction.