What is a blockchain and what is the role of a blockchain?

What is a blockchain? What changes will it bring to the future life?

Blockchain is a new application mode of distributed data storage, point-to-point transmission, knowledge mechanism, encryption algorithm and other computer technologies.

Blockchain is an important concept of Bitcoin. It is essentially a decentralized database. At the same time, as the underlying technology of Bitcoin, it is a series of data blocks related by cryptography. Each data block contains a batch of information about bitcoin online transactions, which is used to verify the validity of the information (anti-counterfeiting) and generate the next block.

In fact, the original English version of the Bitcoin white paper does not have the word blockchain, but uses blockchain. In the earliest Chinese translation of Bitcoin white paper, blockchain was translated into blockchain. This is the earliest time when the Chinese word "blockchain" appeared.

The National Internet Information Office issued the Regulations on the Management of Blockchain Information Services on 20 19 10, which came into effect on February 20 15.

In a narrow sense, blockchain is a chained data structure that combines data blocks in chronological order, which is cryptographically guaranteed to be an unbreakable and unforgeable distributed account book.

Broadly speaking, blockchain technology is a brand-new distributed infrastructure and computing method. It uses blockchain data structure to verify and store data, uses distributed node identification algorithm to generate and update data, uses cryptography to ensure the security of data transmission and access, and uses intelligent contracts composed of automated script codes to program and manipulate data.

In fact, it is very simple and vivid. We can imagine that everything in life is realized in digital form, such as food, clothing, housing, transportation, medical care, education and so on. Based on the Internet, it can be easily done at home. No matter where we go to do business or trade, the mobile phone can be operated completely. With the continuous development, everything can be easily done online, such as specific work, production, planting and so on. Of course, no one can accurately predict what the rise of 5g will bring.

Blockchain was born in Bitcoin in Satoshi Nakamoto. Since 2009, various bitcoin-like digital currency have appeared, all of which are based on the open blockchain.

There are many flowers in digital currency, and some common ones are listed: Bitcoin, Litecoin, dogecoin, okcoin, etc. In addition to the application of money, there are various derivative applications, such as NXT, SIA, Bitstock, MaidSafe, Ripple, Ethereum and so on.

2065438+200665438+1On October 20th, the People's Bank of China digital currency Seminar announced that the research on digital currency had achieved initial results. The meeting affirmed the value of digital currency in reducing the issuance of traditional currency, and said that the central bank is exploring the issuance of digital currency.

Some areas where the blockchain can be used include:

? Intelligent contract

? securities trading

? E-commerce/e-commerce

? Internet of things

? social communication

? file storage

? Proof of existence

? certificate

? crowdfunding

The development of blockchain can be compared with the development of the Internet itself. In the future, something called Finance-Internet will be formed on the Internet. This thing is based on blockchain, and its predecessor is Bitcoin, that is, traditional finance starts from private chain and industrial chain (local area network), and Bitcoin series starts from public chain (wide area network), all of which express the same concept-DigitalAsset, and finally converges to a middle equilibrium point.

The core advantages of blockchain architecture include:

Any node can create a transaction. After a period of confirmation, it can be reasonably confirmed whether the transaction is valid, and the blockchain can effectively prevent the occurrence of problems between both parties. Trying to rewrite or modify the transaction record is very expensive. Blockchain realizes two kinds of records: transaction and block. Transactions are actual data stored in the blockchain, and the blockchain is a record that confirms when and in what order certain transactions become part of the blockchain database. Transactions are created by participants using the system in the normal process (in the case of encrypting digital currency, transactions are created by bob sending a token to alice), while blocks are created by units we call miners.

So in the end, this is undoubtedly a new technology that changes life. In the future, the production activities of the whole society will be carried out with blockchain as the underlying logic. Many things can be at your fingertips. The integration of artificial intelligence and big data can make it easy for us to deal with things that seem complicated now, such as some securities market transactions and intelligent matching of financial activities.

It is well understood that the blockchain is to integrate people and property, human and machine things, people and goods into one and package them into a whole; Network computing center running on the infrastructure.

Now the author's brain hole is not big enough to imagine what the future world will be like. I am looking forward to it!

I know a thing or two about this problem. Let's take a look at this mysterious thing-blockchain.

Blockchain is a new application mode of distributed data storage, point-to-point transmission, knowledge mechanism, encryption algorithm and other computer technologies. Blockchain is an important concept of Bitcoin. It is essentially a decentralized database. At the same time, as the underlying technology of Bitcoin, it is a series of data blocks related by cryptography. Each data block contains a batch of information about bitcoin online transactions, which is used to verify the validity of the information (anti-counterfeiting) and generate the next block.

The more fanatical you are, the more you have to discard the false and retain the true. First of all, we must first figure out what is the real blockchain technology.

For example, take buying fruit online as an example.

The process of buying fruit online is as follows:

After using blockchain technology and decentralized form, the process of buying fruit is as follows:

Summary:

1, we found that the original transaction process was: the buyer and the seller traded, and all the key processes were dealing with the payment platform. The advantage of this is that once any problems occur, both buyers and sellers can seek help through the platform and let the platform arbitrate. However, there is a major bug or hacker attack on the platform, which leads to the loss of all transfer records for a period of time. How to deal with the loss is a hassle.

2. The transaction process using blockchain technology is that everyone's books have exactly the same transaction records. Even if Alipay's ledger server is broken, the seller's ledger is still there, and the buyer's ledger is still there. Once this transaction happens, it will never be erased.

This is the core of the blockchain, which is the word "accounting+recognition".

The development and maturity of blockchain technology cannot be separated from the foundation and foundation of the above-mentioned new generation Internet technology. Blockchain is not only a technology, but also provides a service model and solution, which has played an extremely important role in promoting the further development of the Internet industry.

1, blockchain+finance

2. Blockchain+supply chain management

3. Blockchain+Intelligent Manufacturing

4. Blockchain+public * * * service

5. Blockchain+education and employment

6. Blockchain+culture and entertainment

7. Blockchain+payment

8. Blockchain+Invoice (enabled in Shenzhen)

The traceability and non-tampering of blockchain just combine with the inherent nature and needs of the financial industry, making the application of blockchain in the field of financial services the most in-depth and relatively mature field so far. Blockchain technology has broad application prospects. The competition of future technology will also be the competition of blockchain.

It is very important to understand the blockchain, which is very important for seeing through all kinds of pseudo-blockchain scams.

If someone uses a bunch of technical terms to explain the blockchain, it is difficult for you to understand, and he may not really understand it himself.

So, let's set up a psychological defense line first. People who sell you concepts and say a lot of unclear technical terms may be liars. Be careful!

To understand the blockchain, we must know what the core appeal of the blockchain is. Imagine, in today's highly developed Internet, what are you most worried about?

Privacy, yes, privacy. How to protect privacy? You may be monitored at any time, and any personal data may be stolen at any time. If personal privacy is not absolutely protected, the Internet will become another golden tower of power. Who is standing on the top of the golden pagoda? It is the cleverest technical expert, platform provider and information supervisor. You and I may be the people at the bottom of this golden pagoda.

The people who first invented the blockchain, with serious concerns about individuals being completely swallowed up by the Internet, tried to create an absolutely safe encryption technology to lock personal privacy. This technology completely subverts the traditional encryption technology. In fact, instead of locking up privacy, it is better to tear it up and distribute it to different people for private custody. Unless everyone agrees to take out the pieces and spell out the complete password, the truth cannot be reproduced. This is the first mechanism of blockchain, namely decentralization.

However, decentralization alone is not enough. It is also necessary to let people who steal password fragments have nowhere to hide, and let the thieves' every move be indelibly recorded and spread everywhere on the Internet. This is the second mechanism of blockchain, that is, the stealth mechanism. Think about it, which snooper is not sneaking around?

To sum up, blockchain hides privacy in a decentralized way, records any actions that reproduce this privacy, and makes it public. Seeing this, you may have to applaud the blockchain. Don't worry, what good things are there in the world? Is there an absolutely safe utopia? If the blockchain in absolute sense can be realized, does the existence of the government still make sense? Yes, the blockchain was originally the embodiment of anarchism. Its ultimate meaning is doomed to be impossible to realize. Its survival may have to rely on power, destined to become another beautifully packaged lie and deceptive cover. In this sense, the government must also determine a framework for the development of blockchain, rebuild the value of blockchain, and expel anti-government and anti-state attempts wrapped in blockchain. Some technologies of blockchain can be applied specifically, but they must not promote decentralization. In short, we must be highly vigilant about the blockchain. A stinger is often hidden under a beautiful appearance. Absolute idealized formulas often turn into poison. The person who says that he can absolutely protect your privacy and financial security is the real peeping tom and vampire.

Perhaps the best way for us to protect our privacy can only be a completely open life without any privacy, or a life like the sun or Dionysus.

Viewpoint: 1. The concept of blockchain originated from the technical attributes of Bitcoin (distributed data storage and accounting, decentralization, inability to tamper with transaction records, peer-to-peer information transmission, * * * sharing mechanism ...), but later, some people continued to extend and expand the concept to many commercial fields to facilitate capital speculation. 2. The blockchain in reality (the blockchain in the market is very chaotic at present), and the concept of speculation is mostly in the stock market, and it still exists now. Laws and regulations, even money laundering (the actual operation of blockchain products is one thing, and the capital operation behind it is another matter). At present, computer systems in the world can't meet the technical requirements of blockchain attributes (such as distributed data storage and accounting, decentralization ...), network bandwidth, storage technology and computer computing systems can't meet the requirements of transaction operation (through computer technology, it's easy to block your network, or you can't complete the risks brought by practical applications such as distributed data storage or transaction interruption or delay at any time. It's easy to crack the underlying program of blockchain. As far as the current global computer system is concerned (this is the fatal flaw of 0 and 1 binary logic of computers all over the world. In addition, it's very easy to crack the blockchain if the inverse blockchain mode operation algorithm is adopted. This inverse operation mode can completely tamper with all transaction records. If a real quantum computer goes on the market in the future, it can directly break through all blockchain computer systems. Bitcoin mining is a Ponzi scheme. 3. At present, most blockchains in the global market are basically the concept of capital speculation.

Blockchain has been mentioned for several years. At the beginning of last year, I heard a blockchain tycoon say that 20 18 was the best year for blockchain development. After this year, the development of foreign countries fell behind. What is a blockchain? In terms of influence, it is like the large intestine of a pig, connected one by one. Blockchain is to connect these blocks together, fix them, and use computer and internet encryption technology to prevent secrets from leaking out. This technology can't be told to non-professionals in professional terms, and it is generally incomprehensible. It can only be explained by analogy. Let me give two examples:

1. Four people, Party A and Party B, play mahjong and gamble with chips in each game. When the party broke up, they settled the accounts once and for all. A loses 1500, B loses 300, C wins 200 and D wins 1600. As a result, A only has 1000 yuan, and everyone else has sorted it out. A still owes Ding 400 yuan. This matter, only these four people know, these four people are a piece. What if Party A doesn't pay back the money in the future? No one knows about this except Party A, Party B, Party C and Party D. If Party A wants to breach the contract, it is said that it does not owe money at all. Only Party B, Party C and Party D know that Party A has breached the contract, and it is difficult for others to judge whether Party A owes money. Therefore, the value of blockchain needs to expand participation. What if these four people have more than a dozen friends watching while playing mahjong? This kind of breach of contract is costly, isn't it? This is a block of real life. Extend to the internet? Then there are infinite possibilities and more scenes.

2. If Party A, Party B, Party C and Party D do business in a business group of 500 people, the group of 500 people is a big block. On one occasion, Party A asked Party B for goods worth 10000 yuan, but failed to pay Party B in time. Party A indicated that it would pay Party B within three days. Everyone in the group knows this. If Party A doesn't pay Party B within three days, the other 498 business partners of the Group will know. If Party A breaches the contract, his reputation in this business circle will be affected. This is a block.

Later, Party A wanted to do business with Party C, and Party C asked Party A for goods. Party A said that you should pay a deposit of 5,000 yuan and deliver the goods immediately. Party C paid Party A 5000 yuan, and as a result, Party A delayed delivery. Everyone in this group knows that this is another block. When the two pieces are connected, everyone doubts the credibility of A. After doing this several times, can Mr. A play again? This is the value of blockchain.

Blockchain, seemingly complicated, is actually not complicated; Seemingly simple, it is very difficult to operate in practice. The block is too small to make sense. If the block wants to be big, it will involve privacy and trade secrets. For example, falling in love is not convenient to say in a large group; For example, it is not convenient to discuss openly in the group (block) in advance to cooperate in big business. However, there are still some occasions where blockchain technology is used, such as poverty alleviation and disaster relief fund management. Everyone knows that they supervise each other. I don't know if you know these two examples.

The core and easy-to-understand introduction of blockchain

1. How does the blockchain create trust? We use "1", "2" and "3" to summarize the characteristics of blockchain:

-The sentence "1"summarizes the blockchain: a trusted distributed database;

-The core nature of "2" is distributed and cannot be tampered with;

-"3" key mechanisms: cryptography principle, data storage structure and * * * knowledge mechanism.

The "distributed" and "unbreakable" nature ensures the "honesty" and "transparency" of blockchain, which is the basis for blockchain to create trust.

Second, in terms of industry, it is expected that in the next 3-5 years, the financial industry will mainly radiate to other physical industries, and more practical scenarios will accelerate. The industry will develop from "1 to n" to include entertainment, commodity traceability, credit reporting and so on.

In the future, in addition to using technologies such as side chains, lightning nets, and cross-chains, blockchain needs to be deeply integrated with emerging information technologies such as 5G, artificial intelligence, big data, and Internet of Things to improve technical performance and offline data quality and reduce resource waste.

Third, smart contracts may be the most revolutionary application of blockchain. If smart contracts are widely used in the blockchain, the economic division of labor in the Internet era will be further refined, and all network nodes in the world will directly meet the demand and production, and broader social coordination will be realized.

If the above vision is realized, the combination of blockchain technology and industry is expected to usher in a moment of "from 1 to n", and its outbreak will not be linear but nonlinear, and the blockchain will only be upgraded from a "trust machine" to an important "engine" leading the industrial wave.

Decentralization. Prevent cheating. I used to keep accounts by myself, but now I can change it. Now there are 50 people, everyone has records, and everyone has records in their books. Can you change all 50 yuan? All 50 account books are open unless they are all changed. So it is very useful.

Seeing many people answer, ordinary people can't intuitively understand. Let me explain briefly that the blockchain is decentralized. When something happens, everyone writes it down and has their own password, which cannot be tampered with.

Even if the hacker wants to change it, he has to do it one by one. He's exhausted. In fact, it is impossible, at least for now.

Blockchain is a new application mode of distributed data storage, point-to-point transmission, knowledge mechanism, encryption algorithm and other computer technologies.

Blockchain originated from Bitcoin and is an important concept of Bitcoin. It is essentially a decentralized database. At the same time, as the underlying technology of Bitcoin, it is a series of data blocks related by cryptography. Each data block contains a batch of bitcoin network transaction information, which is used to verify the validity of the information and generate the next data block.

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

After reading the careful advice of so many experts, I still look puzzled. I only remember that someone used this so-called "blockchain" to do pyramid schemes. ...