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1. What are the development trends of China’s blockchain in 2021
Looking forward to 2021, the top-level design of my country’s blockchain will be further improved, and application standards for various industries will be gradually established. The development direction has shifted from technology leadership to market penetration; blockchain integration applications have begun to be implemented in many fields such as finance, supply chain, and government affairs, and the industrial scale will show rapid growth. However, many problems currently faced by the development of blockchain in our country still need to be focused on and started to be solved or alleviated in 2021. For example, the independent innovation capabilities of core technologies still need to be further strengthened, security issues and talent gaps need to be improved urgently, and integrated applications The scene still needs to be explored in depth. Therefore, CCID Research Institute proposed to accelerate the construction of the blockchain ecosystem, improve standards and regulations, improve the supervision system, strengthen the independent innovation capabilities of core technologies, promote the coordinated development of blockchain and other new technologies, and vigorously cultivate professional talents to achieve The blockchain industry is developing healthily.
Yibaoquan has been committed to the research and development and application independent innovation of blockchain since 2014. It is a blockchain electronics company that has maturely used blockchain technology to solidify and store electronic data and has been recognized by judicial authorities. Data storage and security agency. Through the pioneering "blockchain + judicial + application" model, with blockchain technology as the underlying technology and electronic data storage and preservation as the basis, we have launched intellectual property protection (micro-copyright), electronic contract signing (gentleman's signature), Internet Notary System (Zhongzhengbao) has three application layer brands.
E-Baoquan jointly launched the "Preservation Chain" open platform together with the Notary Office, Arbitration Commission, Copyright Protection Center, CA Organization, etc. At the same time, it has connected with the Guangzhou Internet Court and the judicial chain involving more than 30 courts led by the Supreme People’s Court. Continuously improving the "blockchain + judicial" ecosystem, Yibaoquan can provide one-stop blockchain security services such as evidence collection, evidence storage, and certificate issuance for different groups.
Currently, it has obtained 15 independent invention patents, 27 copyrights, ISO 27001 information security system certification, Ministry of Public Security Level 3 certification, national double-high enterprise, and the 2018 National Ministry of Industry and Information Technology Industrial Internet Pilot Demonstration Project (the only Blockchain selected projects), and one of the first batch of domestic blockchain information service registration companies by the State Cyberspace Administration of China in 2019.
2. In 2021, what will be the development trend of my country’s blockchain technology in the future?
Domestic blockchain technology has been conceptualized a few years ago and has now become widespread It has been applied to actual business scenarios, such as the rice we eat, and the QR code on the packaging
Traceability is the application of blockchain technology. Companies like Shanghai Wanglian Technology entered the market earlier and are currently developing very well.
3. The component structure of blockchain technology
With the continuous development of the Internet, more and more people have learned about blockchain technology. Some features and uses. Today we will introduce some elements of the blockchain.
The composition of blockchain
Blockchain consists of blocks and chains. Each block contains three elements: data, hash value, and the hash value of the previous block.
The first element of the block is data. The data stored in the block is related to the type of blockchain. For example, blocks in the Bitcoin blockchain store relevant transaction information, including the seller, buyer, and the amount of Bitcoin traded.
The second element of the block is the hash value. Each block contains a hash value, which is used to identify a block and all the content it contains. Once a block is created, its hash value is calculated accordingly. Changing something in the block will cause the hash value to change. So in other words: hashes are helpful when you want to detect changes to the contents of a block. If a block's fingerprint changes, it is no longer the same block as before.
The third element of the block is the hash value of the previous block. This element allows links to be formed between blocks and makes the blockchain very secure.
As an example, suppose we have a blockchain containing 3 blocks. Each block contains its own hash and the hash of the previous block. Block No. 3 points to block No. 2, and block No. 2 points to block No. 1. But block No. 1 is a bit special. It cannot point to the previous block because it is the first block. We call block 1 the genesis block.
So, now let's say you tampered with the second block. This will cause the hash value of the second block to change, so the data stored in block 3 will be wrong and illegal. Once the data stored in block No. 3 is illegal, the subsequent blocks must also be illegal.
So if a person wants to tamper with any block in the blockchain, he must modify this block and all blocks after this block. This will be an onerous task.
Blockchain proof-of-work
However, the method of using hash values alone is not enough to prevent users from tampering with the zone. piece. Because today's computers are powerful enough to calculate thousands of hash values per second. The Java course suggests that you can completely tamper with a block and recalculate the hash values of other blocks, thus making your block legal again.
4. What is the development history of blockchain technology?
Which came first, Bitcoin or blockchain? When Bitcoin was first born, there was no concept of "blockchain". People used bitcoin (lowercase b) to represent Bitcoin, and Bitcoin (capital B) to represent its underlying technology, which is what we now call blockchain technology. In 2015, The Economist published a cover article “ReshapingAfter "Blockchain Technology in the World", blockchain technology has set off a financial technology craze around the world. Major financial institutions and banks around the world are scrambling to study blockchain technology. In 2016 alone, billions of dollars were invested in blockchain technology. among chain-related enterprises. In September 2017, the Chinese government website (www.gov.cn) published an article "my country's blockchain industry is expected to be at the forefront of the world", publicly supporting the development of blockchain technology and popularizing blockchain technology to 1.3 billion Chinese people . The application of blockchain in real economic fields such as finance, insurance, retail, and notarization has begun to accelerate.
5. What are the future development prospects of blockchain technology?
Blockchain is a technology. “In the simplest and most popular terms, blockchain technology is the Accounting, or distributed ledger."
In the Internet era, there is a database behind every system. This database can be regarded as a large ledger. In the past, the person maintaining the system was responsible for managing the database and recording the user's information. Behavior, that is, accounting, and the blockchain is "decentralized", which allows every member of the system to participate. Not only does everyone keep accounts, but through links, everyone can have a complete ledger.
"Blockchain is essentially a collective recording method. What is special is that it uses a unique set of technologies to achieve the authenticity and credibility of the recording results, which is difficult to destroy and cannot be tampered with." Zhang Xiaorong said, " First, everyone has the right to record and authenticate each other to distinguish authenticity. This is called a consensus mechanism; second, no one can tamper with records because there is a cryptographic signature; third, everyone has a copy, so even if there is a ledger If it is damaged, the whole will not be affected. This is called distributed storage. The information recorded in this way is presented in blocks according to the time chain, so it is called blockchain."
Each currency represented by Bitcoin This encrypted digital currency is originally an application of blockchain technology, which can be said to be version 1.0 of blockchain. But around 2014, the industry began to realize the important value of blockchain technology. Blockchain was gradually separated from digital currency and applied to various economic and social fields other than digital currency.
Broad application prospects
Blockchain technology is considered a disruptive innovation after steam engines, electricity, and the Internet. If steam engines and electricity have liberated productivity, and the Internet has changed the way information is transmitted, then blockchain, as a machine that builds trust, will likely change the way value is transmitted.
For example, in the financial field, the cost of reconciliation, clearing, and settlement between financial institutions, especially cross-border financial institutions, has always been very high, and there are complex manual processes. However, blockchain technology has data that cannot be tampered with and is traceable. Its application can help reduce the cost of reconciliation and dispute resolution between financial institutions, significantly improve the processing speed and efficiency of payment services, and make small-amount cross-border payments possible. In December 2017, China Merchants Bank completed the transfer of RMB positions from Hong Kong Wing Lung Bank to Wing Lung Bank Shenzhen Branch. This is the world’s first inter-bank cross-border RMB clearing business based on blockchain technology.
In addition, according to the "China Blockchain Technology and Application Development White Paper 2016" issued by the Ministry of Industry and Information Technology of China, the application of blockchain has extended to many fields such as medical health, education, charity, and social management. Taking the cultural industry as an example, intellectual property protection has always been a pain point in the industry due to low copying costs, high rights protection costs, and difficulty in providing evidence. With the blockchain, the records of the production, dissemination, and transactions of cultural products are authentic, transparent, credible, and verifiable, and the problem can be easily solved.
Cheung Hsiao-rong said that blockchain technology solves two major problems in the digital economy era: first, the flow direction is visible, and second, there is zero trust cost. In the past, the circulation of physical banknotes was invisible, but the flow of all digital assets has a "chain" that can be checked. Yang Yanchao, a researcher at the Intellectual Property Center of the Chinese Academy of Social Sciences, also believes that the biggest advantage of blockchain is that it truly completes the construction of credit in an anonymous society and brings new opportunities to many fields, thus making various innovative applications possible.
There is a long way to go for future development
In terms of technology promotion, there are not too many barriers to blockchain. This has been proven in the global practice of Bitcoin. The main resistance still comes from conceptual and implementation obstacles.
"On the one hand, society may be very concerned about the 'naked' state in the blockchain. The blockchain builds a 'Skynet' for the business society, and all the company's economic activities are recorded, so there is no There is no secret at all, and such business strategies may not be implemented under the blockchain."
"On the other hand, the current legal system lags behind the development of information technology. How can the emerging blockchain technology be placed under the law? It needs to be studied under supervision." Duan Yongchao said.
The core of blockchain is decentralization, which will have an impact on the central management model that has been formed in society for a long time. In addition to laws, how to establish a regulatory environment that can promote the application of blockchain technology so that the technology can benefit society and not be used for evil is also an urgent problem to be solved.
6. What is blockchain technology? What exactly is blockchain?
In a narrow sense, blockchain is a way to block data in chronological order. A chained data structure composed of sequential connections, and a cryptographically guaranteed 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, and uses cryptography to ensure data transmission and access. It is a new distributed infrastructure and computing method that uses smart contracts composed of automated script codes to program and operate data securely.
[Infrastructure]
Generally speaking, the blockchain system consists of data layer, network layer, consensus layer, incentive layer, contract layer and application layer composition. Among them, the data layer encapsulates the underlying data blocks and related data encryption and timestamps and other basic data and basic algorithms; the network layer includes distributed networking mechanisms, data dissemination mechanisms and dataVerification mechanism, etc.; the consensus layer mainly encapsulates various consensus algorithms of network nodes; the incentive layer integrates economic factors into the blockchain technology system, mainly including the issuance mechanism and distribution mechanism of economic incentives; the contract layer mainly encapsulates various scripts , algorithms and smart contracts are the basis of the programmable features of the blockchain; the application layer encapsulates various application scenarios and cases of the blockchain. In this model, the chain block structure based on timestamps, the consensus mechanism of distributed nodes, economic incentives based on consensus computing power, and flexible programmable smart contracts are the most representative innovations of blockchain technology.
Extended information:
[Blockchain core technology]
Blockchain mainly solves the trust and security issues of transactions, so it addresses this issue Four technological innovations:
1. Distributed ledger means that transaction accounting is completed by multiple nodes distributed in different places, and each node records a complete account, so they all Can participate in supervising the legality of transactions and can also jointly testify for them.
The uniqueness of blockchain's distributed storage is mainly reflected in two aspects: First, each node of the blockchain stores complete data according to the block chain structure. Traditional distributed storage generally stores The data is divided into multiple parts for storage according to certain rules. Second, the storage of each node in the blockchain is independent and has equal status, relying on the consensus mechanism to ensure the consistency of storage, while traditional distributed storage generally synchronizes data to other backup nodes through the central node.
No node can record ledger data independently, thus avoiding the possibility of a single bookkeeper being controlled or bribed to record false accounts. Also because there are enough accounting nodes, theoretically speaking, the accounts will not be lost unless all nodes are destroyed, thereby ensuring the security of the accounting data.
2. Asymmetric encryption and authorization technology. Transaction information stored on the blockchain is public, but account identity information is highly encrypted and can only be accessed with authorization from the data owner. , thus ensuring data security and personal privacy.
3. The consensus mechanism is how all accounting nodes reach a consensus to determine the validity of a record. This is both a means of identification and a means of preventing tampering. Blockchain proposes four different consensus mechanisms, which are suitable for different application scenarios and strike a balance between efficiency and security.
The consensus mechanism of the blockchain has the characteristics of "the minority obeys the majority" and "everyone is equal". "The minority obeys the majority" does not entirely refer to the number of nodes, but can also be the computing power and the number of shares. Or other characteristic quantities that the computer can compare. "Everyone is equal" means that when a node meets the conditions, all nodes have the right to give priority to the consensus result, which will be directly recognized by other nodes and may eventually become the final consensus result.
4. Smart contracts. Smart contracts are based on these trustworthy and non-tamperable data and can automatically execute some predefined rules and terms. Taking insurance as an example, ifIf everyone's information (including medical information and risk occurrence information) is true and trustworthy, it will be easy to automate claims settlement in some standardized insurance products.
In the daily business of insurance companies, although transactions are not as frequent as those in the banking and securities industries, the reliance on trusted data continues unabated. Therefore, the author believes that using blockchain technology from the perspective of data management can effectively help insurance companies improve their risk management capabilities. Specifically speaking, it is mainly divided into risk management of policyholders and risk supervision of insurance companies.
Blockchain-Network
7. How to define blockchain and what are its application scenarios
Many people now think that blockchain Blockchain is a universal technology that can do anything. Blockchain technology is somewhat mythical!
Regarding the definition of blockchain technology, American scholar Melanie Swann defined blockchain technology as an open, transparent and decentralized technology in her book "Blockchain: A New Economic Blueprint and Introduction" database.
Definition of Blockchain: Narrow VS Broad
As for the application scenarios of blockchain technology, it is natural to combine the differences between blockchain and other technologies. In terms of system characteristics.
Blockchain technology features include:
Blockchain is a global A database storage system that can be operated collaboratively in various places is different from traditional database operations where read and write permissions are in the hands of a company or a centralized authority (a characteristic of centralization). Blockchain believes that anyone with the ability to set up a server can participate. Nuggets from all over the world have deployed their own servers locally and connected to the blockchain network to become a node in this distributed database storage system; once joined, the node enjoys exactly the same rights as all other nodes and obligations (decentralized, distributed characteristics).
At the same time, people who provide services on the blockchain can perform read and write operations on any node in the system. In the end, all nodes around the world will complete the process again and again according to a certain mechanism. Synchronize in sequence to achieve complete consistency of data in all nodes in the blockchain network.
At the beginning of this year, the term blockchain began to enter everyone’s lives. From national leaders to aunts who dance square dances, everyone knows this term. This term is widely known by Bit Brought by coins.
As we all know, the first few dozen bitcoins could only be exchanged for one pizza. At its peak, it was more than 20,000 US dollars each, which has skyrocketed by more than a thousand times, which has also benefited a large number of wealthy people. Currently, there are blockchain Virtual currencies generated by technology are increasingly entering people's lives, and many people have joined the ranks of currency speculation. People often say that if you buy the right currency a hundred times, a bicycle will turn into a sports car, and one coin will make you a sports car.You can imagine how attractive the young model is.
Since 2008, various games applying blockchain technology have also become popular, such as development games (Network Letts Dog, 360 Block Cat), mining games (NetEase Planet, Virtual Earth, Gongxinbao), these are attracting everyone to join in the name of blockchain, and of course there are some that are really reliable, which requires everyone to identify them carefully.
The three words "blockchain" were completely ignited during the Spring Festival that just passed, and the limelight overshadowed everything else. Some people said that this was the arrival of a new era, and the past has become classic, while others said To say that everything is hype is ultimately a bubble.
In fact, blockchain technology is not a new concept. It has been applied to many industries, such as electronic signatures, as early as the past two years. Recently, the third-party electronic signature platform eShanbao revealed the latest progress of blockchain applications to NewSeed.
Currently, blockchain technology is mainly used in e-signing products for certificate deposit and certificate issuance. The application scenarios include copyright protection and online signing. , web page forensics, phone recording, email storage of evidence, etc.
Take the rights protection of online works as an example. Since online rights protection generally adopts the method of collecting evidence after the fact, real-time confirmation of rights is not carried out in the process of evidence generation, so the entire confirmation process is difficult. The copyright process is time-consuming, difficult and costly to obtain evidence, and extremely difficult to prove and trace the source. It cannot meet the characteristics of rapid dissemination and large quantity of online works.
eShanbao's new intellectual property protection solution based on timestamp + blockchain starts from the user's real-name authentication and solidifies the information generated in the process in real time. Electronic data, and through the time source service synchronized with the National Time Service Center, online works are stamped with legally valid timestamps to prove that electronic files have not been tampered with in a certain period of time. Blockchain technology can establish point-to-point trust in the network, ensuring that all blockchain nodes can record complete copyright confirmation and transaction records, and can trace their origins, truly realizing anti-repudiation and anti-tampering, and realizing a kind of distribution. trust infrastructure.
Founder and CEO Jin Hongzhou believes that the application of decentralized blockchain technology has greatly improved the efficiency of data storage and certification, and The credibility of the identity of the parties reduces the cost of trust, but it cannot replace the original centralized public key encryption technology. The two should complement each other. Through the combination of the two, it can provide users with real-time and reliable Confirmation plan.
Next, eShuabao will also focus on building a smart contract platform based on blockchain technology. Jin Hongzhou said that data storage, Certificate issuance is only a relatively superficial application based on blockchain technology. It is the first step to realize the implementation of blockchain technology, and the realization of real smart contracts is the second step. "Smart contracts cannot simply be understood as electronic contracts. They refer to a process, from the conclusion of the contract to the confirmation to the final execution." Jin Hongzhou explained.
Through the following limited cases, I hope everyone can understand the actual performance of blockchain technology, thereby stimulating interest in such solutions.
1. Administrative Services
Over the centuries, the roles and responsibilities of public administration have not changed significantly – or rather, what has changed dramatically is actually the size of the data and the specific ways in which public agencies handle it. Although various digital technologies already exist to help collect and process data, issues such as anonymization, portability, and the immutability of large amounts of data remain unresolved.
Sasha Ivanov, founder, entrepreneur and CEO of Waves Platform and Vostok projects, said, "What the public administration currently lacks is a more convenient user experience (UX) for data use. To improve the user experience , we should introduce some kind of layer to it that acts as a trusted public environment that is transparent and can store data anonymously and immutably."
Governments are working on this by launching the U.S. Federal agency and enterprise-level initiatives such as the Federal Blockchain Initiative are gradually confronting the existence of such problems. The United States held its first federal government blockchain forum in July 2017, and the U.S. General Services Administration currently has more than 200 related use case repositories. Ivanov explained, “Distributed systems can really help us build such a reliable environment, improve our big data work, and even integrate all emerging technologies – including artificial intelligence and the Internet of Things. In fact, , whenever we face any kind of technology, it always embodies the sum of certain other technologies."
Now, the system supported by the blockchain can actually work - this This view has been unanimously recognized by all experts and has become the most important theoretical basis. In other words, what we need to do next is create more production-ready solutions.
2. Payment services
The government needs to process transactions, many of which involve the exchange of funds with citizens. Blockchain technology has huge potential application value in reducing the cost of fund transfers - including using new blockchain-based cryptocurrencies as intermediate transaction carriers, or using blockchain as a means of fund transfer, etc. Once a perfect solution is discovered, the business opportunities will be endless - especially for those who need to conduct frequent cross-border or Internet transactions.
The Jasper project was developed by the Bank of Canada to help it furtherThink about how central banks and other financial institutions should implement payment operations between different banks based on distributed ledgers. The Bank of Canada has also developed its own digital currency variant, “CAD Coin,” to test the feasibility of using a national currency on top of the blockchain.
This project brings to an interesting conclusion that we should say no to proof-of-work public chain systems. In a paper titled "Project Jasper: Is a Distributed Batch Payment System Feasible?" the author observed that "Proof-of-work systems are not suitable for such large transaction processing systems because they assume that all transactions in the system are There is a need for openness and observability to a certain extent.”
3. Digitization and intellectual property
Governments are responsible for maintaining copyright records and databases. These records prove ownership of intellectual property. A blockchain-based system would allow artists, performers and writers of all kinds to time-stamp their works and theoretically detect copyright infringements and even keep a permanent record of their rights. In fact, many governments have already taken important exploratory steps in this direction.
Iran recently announced that it will deploy this technology. "Iran Financial Tribune" quoted Morteza Mousavian as saying that "the Digital Media Department of the Ministry of Culture has reached an agreement with a blockchain company to jointly design a system that can be used to protect online copyrights." He also added that "the relevant procedures will It will soon be released to users in an easy-to-use format."
This work is still in the early exploratory stages, but it offers enterprise customers the possibility of preserving records through replication technology. From a theoretical level, companies can use blockchain solutions to conduct financial accounting and discover errors in real time.
4. Welfare distribution
The government has the responsibility to create a level playing field for citizens. Citizens who are chronically poor or economically disadvantaged certainly need government support and assistance to ensure that they are able to sustain themselves and develop. However, welfare distribution is neither simple nor often straightforward. Problems such as corruption and impersonation have been wreaking havoc on various distribution channels within government schemes.
In China, the National Council of Social Security Fund is conducting early research on how to use blockchain technology to improve the delivery of national benefits to citizens. At the same time, India is also taking action. Andhra Pradesh and Telangana are already using blockchain to support their civilian resource supply systems.
It is said that many companies, including Microsoft, are also considering using the same technology. These solutions, which will touch individual employees and functional roles, are expected to gradually appear in small businesses in the near future.
5. Bidding activities
In order to build public infrastructure or provide related services, the government hopes to achieve economies of scale through bidding as much as possible.Economic and competitive gains. However, the bidding process is often not fair or transparent. Public procurement has long been a major scene of rampant corruption around the world. Transparency International noted that “many governments will award project contracts to a certain supplier in the absence of fair competition. This allows companies with greater political resources to improperly win over competitors; or companies in the same industry Bids will be negotiated in advance between companies, ensuring that each company gets a share of the tender. This will significantly increase the cost of delivering services to the public - we have found that corruption issues can increase project costs by 50%."
So, how can blockchain technology solve the bidding problem? According to Ivanov, “Unlike decentralized centralized systems, independent ledgers powered by blockchain will be able to improve bidding or anything else that needs to be tracked. Transparency of financial processes. The intervention of blockchain technology will help track the use of funds and ensure that they are paid out as expected and within the allowed time."
Currently, Japan’s internal affairs and The Ministry of Communications has announced a blockchain-based bidding system, which means that in industries with serious collusion problems, small and medium-sized enterprises are expected to usher in a more transparent bidding method and brighter development prospects.
Although quite a few of the cases mentioned previously are far from finalized, they do provide many possibilities for companies and governments. Of course, the key lies in implementation; and we should also look at all this with optimism, that is, although blockchain technology is often misunderstood, it is and will eventually find a direction in which it can exert its own energy!
< p> In layman's terms, the blockchain is like a dozen beacon towers on the Great Wall. If an enemy comes at one place, they will send out smoke. The other beacon towers will know about it and enter a defensive state together. In technical language, it is a distributed ledger. Each node keeps accounts separately. The failure of one or two nodes will not affect the entire network.
How is this distributed network different from the distributed servers of Google Network? Google Network's distributed servers still belong to Google Network and are controlled by their central scheduling algorithm. The distributed nodes in the blockchain do not know each other and have no legal relationship. You can just go offline and shut down if you want, but because of the currency rewards, there will always be someone who will turn on the machine as a new node to support the network.
After the popular and technical explanation, I hope you understand. So the first application scenario is finance. I put my money in Alipay. If Alipay doesn't recognize it one day, there's nothing you can do. But on the blockchain, it is useless if one node does not acknowledge it, because other nodes still have my records. The second is the contract. Nowadays, contracts are made on paper, which is easy to forge. But if you put it on the blockchain, it cannot be forged..
There are more application scenarios. It is recommended to check the top 100 digital Huobi online to understand the corresponding projects behind them and become a blockchain expert. .
Blockchain technology was first used in Bitcoin. Blockchain provides a reliable and trustworthy means of organizing data for cross-subject business scenarios. JD.com is essentially a supply chain company, and blockchain technology will be first used in many scenarios of the supply chain.
Blockchain is a decentralized technology. Blockchain can be applied to all products currently covered by the Internet.
The most popular application industry at present is the financial industry.
An application that has been implemented is product traceability. Alibaba and JD.com are already using blockchain technology to fully trace the origin of some of the products they sell. Consumers can trace the origin of the purchased products. There are also many blockchain applications in the digital advertising industry. Since traffic fraud in digital advertising causes losses of tens of billions of dollars every year, there are already blockchain application projects based on digital advertising, such as DCAD, which is based on blockchain. The digital advertising application of blockchain technology mainly solves the problem of traffic fraud
In the future, as the application of blockchain technology becomes more mature, it will be applied in many industries, creating a new ecosystem based on technological trust. Mode
The characteristics of blockchain are distributed accounting and decentralization, but the ultimate goal is to make people get along more equally. Technology is meaningful only when it serves human values, and technology that meets human value needs will develop. Therefore, blockchain is in line with human pursuit of freedom and equality, so its trend to become mainstream is unstoppable.
Currently, there are many blockchain gimmicks, which are basically used to issue coins. The newly launched ono is a decentralized, free and global social platform. Due to decentralization, your chat communication information is peer-to-peer and cannot be viewed by others. In other words, your every word and deed will no longer be recorded and reviewed at any time like it is now on WeChat, QQ, and Facebook, freeing you from the trouble of surveillance.
In fact, blockchain technology can be used in any field. Information that previously required third-party confirmation can be completed online and confirmed at multiple nodes, making it difficult (almost impossible) to delete.
At present, blockchain is still in its infancy, and the technology is not mature enough, but it is also a better time to enter.
What is blockchain If you use non-technical terms to explain blockchain, blockchain is a place where data is stored. However, the data stored in the blockchain is safe and reliable and does not need to be managed by anyone, so In the Internet, a place where data and information are exploding, having such a place would be like a magical treasure.
If youWhen asking what blockchain can do, it is better to ask what applications need to use blockchain. As mentioned earlier, blockchain is a safe place, so wherever data needs to be protected securely on the Internet, blockchain technology needs to be used. For example:
Because the use of blockchain technology can better protect the data of policyholders, in today’s Internet, data is value and wealth, so value protection and value transmission are the future development directions of the Internet. And blockchain technology can really do just that.
If there are any deficiencies, you are welcome to comment and correct me.
In a narrow sense, blockchain is a chained data structure that combines data blocks in a sequential manner in chronological order, and is cryptographically guaranteed to be non-tamperable and non-tamperable. Fake distributed ledger.
The two parties involved in the transaction do not need to know who the other party is, nor do they need a third party for trust endorsement. They only need to trust a common algorithm to establish mutual trust and conduct direct transactions.
Its characteristics are trustlessness and decentralization. The destruction of each node's ledger has no impact on the entire blockchain. The blockchain runs point-to-point payments without a center that may cheat, and the security is greatly improved. Improved, the entire transaction network has changed from a star structure to a point-to-point P2P structure.
In the future, blockchain will be used in many fields and will have a great impact on human life. . It can be widely used in fields ranging from digital currency to securities and financial contracts, medical care, games, artificial intelligence, smart contracts, Internet of Things, e-commerce, file storage and other fields.
1. Cloud storage
This is the statistics of current cloud storage on the Internet. In terms of volume, Google has the largest volume, which is 8,000PB. So what if we share the idle data on the Internet?
Starlight Cloud builds a blockchain data computing and storage lake through Starlight Chain, with a total storage capacity of 15,000P (approximately 15.72864 billion G) in the future. This will be more than 10 times that of Alibaba Cloud's 1500PB! It is also more than four times the size of the Taizhou Storage Center, the largest storage lake in the world after expansion.
2. Medical aspects
Using blockchain technology to save personal medical records also retains personal medical historical data, which can be used when seeing a doctor or planning for your own health in the future. Historical data can be called directly. These data are highly private, and the use of blockchain technology also helps protect patient privacy.
8. Blockchain technology
Background: After the birth of Bitcoin, it was discovered that the technology was very advanced, and blockchain technology was discovered. Bitcoin and blockchain technology were discovered at the same time.
1.1 The purpose of the birth of Bitcoinof:
① Currency transactions have records, that is, ledgers;
② Disadvantages of centralized institutions’ accounting—can be tampered with; easy to change
Bitcoin Solve the first problem: anti-tampering - hash function
1.2 hash function (encryption method)
① Function: Convert a string of any length into a fixed length (sha256) Output. The output is also called a hash value.
② Features: It is difficult to find two different x and y such that h(x)=h(y).
③Application: md5 file encryption
1.3 Blockchain
①Definition
Block: Split the general ledger into zones Block storage
Blockchain: On each block, add a block header. It records the hash value of the parent block. By storing the hash value of the parent block in each block, all blocks are connected in order to form a blockchain.
②How does the blockchain prevent transaction records from being tampered with?
After the blockchain is formed, tampering with any transaction will cause the hash value of the transaction block to be different from that of its sub-blocks. , tampering was discovered.
Even if you continue to tamper with the hash value in the sub-block header, the hash value in the sub-block will be different from that in the grandchild block, and the tampering will be discovered.
1.4 The essence of blockchain
①The essence of Bitcoin and blockchain: a big ledger visible to everyone, only recording transactions .
②Core technology: Through cryptographic hash function + data structure, it ensures that the ledger records cannot be tampered with.
③Core function: Create trust. Fiat currency relies on government credibility, and Bitcoin relies on technology.
1.5 How to trade
① To conduct transactions, you need an account number and password, corresponding to the public key and private key
Private key: a string of 256-bit binary numbers , no application is required to obtain it, and you don’t even need a computer. You can generate the private key by tossing a coin 256 times.
The address is converted from the private key. The address cannot reverse the private key.
The address is the identity, which represents the ID in the Bitcoin world.
After an address is generated, it can only be known by everyone if it enters the blockchain ledger.
②Digital signature technology
Signature function sign (Zhang San’s private key, transfer information: Zhang San transfers 10 yuan to Li Si) = signature of this transfer
< p> Verify Korean verify (Zhang SanAddress, transfer information: Zhang San transfers 10 yuan to Li Si, signature of this transfer) = TrueZhang San uses his own private key to sign this transaction through the signature function sign().
Anyone can verify whether the signature was issued by Zhang San himself who holds Zhang San's private key by verifying the Korean vertify(). It returns true, otherwise it returns false.
sign() and verify() are cryptographically guaranteed not to be cracked. ·
③Complete the transaction
Zhang San will provide the transfer information and signature to the entire network. Under the premise that the account has a balance, after verifying that the signature is true, it will be recorded in the blockchain ledger. Once recorded, Zhang San's account will be reduced by 10 yuan, and Li Si's account will be increased by 10 yuan.
Supports one-to-one, one-to-many, many-to-one, and many-to-many transactions.
In the Bitcoin world, private keys are everything! ! !
1.6 Centralized Accounting
① Advantages of Centralized Accounting:
a. No matter which center keeps accounts, don’t worry too much
< p> b. Centralized accounting, high efficiency②Disadvantages of centralized accounting:
a Denial of service attack
b Stop service after getting tired
p>c Central institutions are vulnerable to attacks. For example, destroying servers and networks, committing self-intrusion, legal termination, government intervention, etc.
All attempts at confidential currencies with centralized institutions in history have failed.
Bitcoin solves the second problem: how to decentralize
1.7 Decentralized accounting
①Decentralization: Everyone can keep accounts. Everyone can keep a complete ledger.
Anyone can download open source programs, participate in the P2P network, monitor transactions sent around the world, become an accounting node, and participate in accounting.
② Decentralized accounting process
After someone initiates a transaction, it is broadcast to the entire network.
Each accounting node continues to monitor and continue transactions across the entire network. When a new transaction is received and the accuracy is verified, it is put into the transaction pool and continues to be propagated to other nodes.
Due to network propagation, the transactions of different accounting nodes at the same time are not necessarily the same.
Every 10 minutes, one person is selected from all accounting nodes in a certain way, and his transaction pool is used as the next block., and broadcast to the entire network.
Other nodes delete the transactions that have been recorded in their own transaction pool based on the transactions in the latest block, continue accounting, and wait for the next selection.
③ Features of decentralized accounting
A block is generated every 10 minutes, but not all transactions within these 10 minutes can be recorded.
The accounting node that obtains the accounting rights will be rewarded with 50 Bitcoins. After every 210,000 blocks (approximately 4 years), the reward is halved. The total amount is about 21 million, and it is expected to be mined in 2040.
Recording the reward of a block is also the only way to issue Bitcoin.
④ How to allocate accounting rights: POW (proof of work) method
Compete for accounting rights by calculating mathematical problems on several accounting points.
Find a random number that makes the following inequality true:
There is no other solution except traversing the random numbers starting from 0 and trying your luck. The process of solving the problem is also called mining.
Whoever solves the problem correctly first will get the accounting rights.
If a certain accounting node finds the solution first, it will announce it to the entire network. After other nodes verify that it is correct, a new round of calculation will start again after the new block. This method is called POW.
⑤ Difficulty adjustment
The generation time of each block is not exactly 10 minutes
As Bitcoin develops, the computing power of the entire network does not increase.
In order to cope with changes in computing power, the difficulty will be increased or decreased every 2016 blocks (about 2 weeks), so that the average time for each block to be generated is 10 minutes.
#欧易OKEx# #BTC[超话]# #digital currency#
9. What is the mystery of blockchain technology? What will it bring to people’s production and life? What impact will it bring
Bitcoin is a virtual currency invented in late 2008 and early 2009. He published an article "Bitcoin: A Peer-to-Peer Electronic Cash System". Blockchain technology is a technology he uses. In other words, Bitcoin is the world's first "decentralized" digital currency. In order to invent it, Satoshi Nakamoto created a new technology and named it "blockchain". In 2019, the country placed great emphasis on accelerating the development of blockchain technology and industry in collective learning. An important characteristic of blockchain is that it is decentralized, cannot be tampered with, and cannot be forged.
Blockchain technology will definitely have great potential in the future. Now it is a new technology, and people may not be familiar with it, so their acceptance is not high. However, with the support of national policies, the advantages of blockchain technologyThe potential is highlighted and the fields of application will be more extensive in the future.
