Definition of blockchain by MIIT

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

2. At present, blockchain technology is mainly applied in smart contract, identity authentication and asset transaction

in addition to solving the security problem, blockchain technology can also change the following areas:

1. In the future, music right distribution is likely to enter the stage of blockchain, removing the intermediate link, so that musicians can get more direct income. In the past, record companies or the Internet were required to increase user stickiness. There were a lot of fees in the middle of promotion or song playing, but not many were really given to the authors, because the original right was still in the hands of several major record companies

2. Writing right is the same. For example, you may have to find a publisher before. This right can't be sold many times, and the money given to the author is also very small. With blockchain technology, all users need to pay the right fee to the author, not limited to a single publisher. Previously, Mr. Li Xiaolai did the press one project, which is mainly aimed at right distribution

3. The Internet of things and blockchain technology will combine to proce the blockchain Internet of things (Biot). Blockchain Internet of things can greatly rece the risk of hacker attacks. With the help of blockchain Internet of things, it may be as convenient as mobile phones to obtain warehouse sensor data

Kevin Kelly's book out of control has become the wind vane of the development of the Internet. In his later book necessity, he also mentioned that "technology has a preference in nature, which makes it move in a certain direction. On the premise that other conditions are the same, the physical and mathematical principles that determine the development of science and technology will favor certain specific behaviors

the development of blockchain technology is an "inevitable" trend, and bitcoin and some valuable digital currencies are only proced because of one of the needs. Today's blockchain is like the Internet in 1994. The development of the times will screen out the best technology and procts. It's just a matter of time

now there are too many "pseudo blockchain" projects focusing on blockchain, because too many people blindly invest in them without understanding. I want to make a fortune in this market. Those people are aiming at leeks that enter the coin circle without learning anything. They casually make small packages on the open public chain, issue a coin, hold a roadshow and want to circle a group of people to come in. They want to run after they circle money. In fact, they have no actual technical content and can't solve any practical problems.

3. In essence, blockchain is a distributed database system with cryptography technology, multi-party participation, common maintenance and continuous growth, also known as distributed shared ledger. Each account page in the shared ledger is a block, and each block is full of transaction records. The blocks are connected closely, forming a chain structure; If you don't understand this area, I suggest you learn the basic knowledge from Xuan, Ling, network and company! At present, there are few people who really understand technology and business. Many people follow suit and learn. They are not clear about the definition of blockchain, so they start to attack the blockchain field. Some of them are learning technology, and some of them choose to invest in the blockchain market

4. It's a public list of all the transactions that have been sent. It ensures that everyone knows the real owner (address) of each bitcoin. All full function nodes on the network will keep a of the blockchain< Br > block is an independent unit in the blockchain. Each block contains the hash value of the previous block (so it is impossible for someone to delete or modify any block on the blockchain without making some hash values on the blockchain mismatched), as well as as as many unconfirmed transactions that can be found on the network, and a number called nonce random number. Someone who is creating a block must find a suitable nonce random number so that the hash value of the block is lower than a certain threshold (the target value). This can only be done by trying all the random numbers one after another until a random number with the desired hash value is found. The lower the target value is, the more difficult it is to find a suitable random number. Deliberately making block creation so difficult is to prevent someone from spending bitcoin, and then create and promote his own blockchain that does not include the transaction that shows that bitcoin has been spent just now, erase the transaction record once and allow him to spend bitcoin twice. When a valid block is created, it will be distributed to the whole network, and then search for the next block based on this block.

5. Blockchain refers to a distributed and shareable public account book that can be trusted through consensus mechanism and checked by each participant. However, no centralized single user can control it. It can only be revised according to strict rules and open protocols<

features:
1. Decentralization
in current system design or application development, central server is considered to realize all information exchange and data storage. But in the blockchain, through the construction of distributed architecture and open source protocol, all participants participate in data recording and verification, and then send them to each node through distributed propagation. Even if some nodes are attacked or damaged, the integrity and information update of the whole database will not be affected, which means that each participating node is "self-centered"

2, to trust
in traditional Internet mode, it is through the trusted central node (such as the housing registration system) or the third party channel (such as Alipay) to carry out the matching verification and trust accumulation, so it can not achieve the center of value transfer.

3. Timestamp
blocks are generated by packaging all the information (including data and code) generated in a certain period of time. The index information of the previous block is included in the page capital of each next block, and the chain is formed by end-to-end connection. Therefore, the addition of block (Complete History) and chain (complete verification) forms a time stamp (which can trace the complete history). It stores all the historical data in the system, provides retrieval and search functions for each data, and can trace the origin and verify each data by means of blockchain structure<

4. Asymmetric encryption
blockchain is an asymmetric encryption algorithm through the mathematical consensus mechanism, that is, a "key pair" is used in the process of encryption and decryption, and the two keys in the "key pair" have the characteristics of asymmetry: first, only the other key can be decrypted after one key is encrypted; Second, after one of the keys is public, other people can't work out another key according to the public key.