Global blockchain industry database

1.

, under the testimony of the leaders of Hunan high tech Zone, will jointly publish the first 2018 global chain chain instry yearbook by China Mobile communications Federation, international block chain application alliance, self chain college and Wutong think tank. The details are as follows:

since October 2016, the Ministry of instry and information technology has issued the white paper on China's block chain technology and application development (2016). blockchain was identified as a strategic frontier technology for the first time and was written into the notice of the State Council on printing and distributing the 13th five year plan of national informatization issued by the State Council in December 2016. The plan clearly puts forward the need to strengthen the innovation, test and application of new technologies such as blockchain, so as to seize the leading power of the new generation of information technology

local governments have also issued guidance and notification documents on blockchain. According to financial statistics, as of March 2018, Beijing, Shanghai, Guangzhou, Shenzhen, Zhejiang, Jiangsu, Guizhou, Fujian, Guangdong, Shandong, Jiangxi, Inner Mongolia, Chongqing and other provinces and cities have issued guidance on blockchain

Chen Xiaohua, director of ecation and examination center of China Mobile Communications Federation, Secretary General of international blockchain innovation and application alliance of China Mobile Communications Federation, and President of Beiyou online digital economy research institute, said: "one of the biggest values of blockchain technology is the combination with big data. Blockchain technology will be the key technology to build a social big data platform. The combination of blockchain and big data will solve the deep-seated problems of data interconnection and open sharing. "2018 global blockchain Instry Yearbook" is a big database of blockchain ecological information. Through research and aggregation of the whole ecological instry data of blockchain, it provides authoritative system data mining analysis, data docking and matching, intelligent information flow and instry spectrum for blockchain enthusiasts, avoids learning blind spots, popularizes blockchain knowledge, and promotes the healthy development of blockchain ecology. "

"the development of blockchain in the past two years is obvious to all. Local governments are also more active in promoting the development of blockchain technology and application. With the innovation and upgrading of blockchain, deep integration and innovation with cloud computing, big data and other cutting-edge technologies, it will promote the application of blockchain technology in medical, judicial, instrial, media and other fields Business exploration and application of games and other subdivided fields. The healthy development and application of blockchain in the future cannot be separated from the construction and improvement of instry ecology. From 2015 to 2018, more than 50 instry associations / alliances related to blockchain have been established in China, and blockchain media and institutions emerge in an endless stream. With the rapid development of blockchain, a large number of enthusiasts, practitioners, entrepreneurs and investors will participate in the future, And the 2018 global blockchain Instry Yearbook provides an authoritative platform for them to systematically understand the blockchain instry. " Tang Yuze, President of the Institute of creative talents of Wutong think tank, believes that the 2018 global block chain instry yearbook will have a significant impact on the future development of the block chain.

as one of the sponsors of this yearbook, Jian Jinqiu, founder of Zilian college, said: "technological innovation is the core driving force for the in-depth development of the blockchain instry, and the technological innovation of China's blockchain instry is undergoing a process of obvious acceleration. Thanks to the continuous innovation of blockchain technology and China's huge Internet consumer groups, blockchain applications in China also show a wide range of diversified and active characteristics. From 2016 to 2018, private equity investment in China's blockchain field has been invested in many fields, such as blockchain personnel training, infrastructure, underlying technology, related services, blockchain application, etc., and China's blockchain instry chain has basically taken shape. And the government is increasingly facing up to and affirming the value of the blockchain, and the launch of the 2018 global blockchain Instry Yearbook is to build a good blockchain instry ecology and promote the healthy development of the blockchain instry. "

with the continuous excavation of the potential value of the blockchain, the heavyweight multinational instry giants have entered the blockchain field by setting up research groups, investing in blockchain start-ups, developing the basic platform of blockchain, and studying the potential application scenarios in the future. Their demonstration and leading role has begun to drive a new round of blockchain entrepreneurship and innovation wave. As the world's first blockchain Yearbook, 2018 global blockchain Instry Yearbook will invite world-renowned scholars and enterprise experts to write it, and give full play to the role of blockchain policy guidance to better promote the healthy development of the blockchain instry

2.

Blockchain includes public blockchain, joint (instry) blockchain and private blockchain. Public chain point-to-point e-cash system: bitcoin, smart contract and decentralized application platform: Ethereum

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

blockchain is an important concept of bitcoin. In essence, it is a decentralized database. At the same time, as the underlying technology of bitcoin, it is a series of data blocks generated by using cryptographic methods. Each data block contains a batch of bitcoin network transaction information, Used to verify the validity of its information (anti-counterfeiting) and generate the next block

extended data

according to the different degree of blockchain network centralization, three kinds of blockchains under different application scenarios are differentiated:

1. The blockchain with the whole network open and without user authorization mechanism is called public chain

2. The authorized nodes are allowed to join the network, and the information can be viewed according to the authority. It is often used in the inter agency blockchain, which is called alliance chain or instry chain

3. All the nodes in the network are in the hands of one organization, which is called private chain

alliance chain and private chain are also called licensing chain, and public chain is called non licensing chain

blockchain features

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

2. Openness. Blockchain technology is based on open source. In addition to the private information of all parties involved in the transaction is encrypted, the data of blockchain is open to everyone. Anyone can query blockchain data and develop related applications through the open interface, so the information of the whole system is highly transparent

3. Independence. Based on consensus specifications and Protocols (similar to various mathematical algorithms such as hash algorithm used by bitcoin), the whole blockchain system does not rely on other third parties, and all nodes can automatically and safely verify and exchange data in the system without any human intervention

4. Safety. As long as 51% of all data nodes cannot be controlled, the network data cannot be arbitrarily manipulated and modified, which makes the blockchain itself relatively safe and avoids subjective and artificial data changes

5. Anonymity. Unless there are legal requirements, technically speaking, the identity information of each block node does not need to be disclosed or verified, and the information can be transferred anonymously

3. const SHA256 = require(crypto-js/SHA256);< br />class Block{
constructor(index,timestamp,data,previousHash='&# 39;)< br />{
this.index=index;< br />this.timestamp=timestamp;< br />this.data=data;< br />this.previousHash=previousHash;< br />$this.hash=this.calculateHash();< br />}

calculateHash(){
return SHA256(this,index+this.previousHash+this.timestamp+JSON.stringify(this.data)).tostring();< br />}
}
class Blockchain{
constructor(){
this.chain=[this.createGenesisBlock()];<
}
/ / create a generated information block
creategenesis block() {
return new block (0, & quot; 01/01/2019",& quot; Genesis block", 0);
/ / the date is the user's data. In fact, it is the hash value obtained by adding several values together. Here, the information is encrypted and the picture is encrypted. Then the data is still stored in the database, but all the data are hash values. To get this data, you must know the hash value of the previous data block. Then, if the hacker needs to crack all the nodes, the hash value is decrypted, Then all the blocks from the first node to the last node can be decrypted to get the real data. So the security of data stored in the blockchain depends on whether the data is encrypted. If the plaintext is not encrypted, then it is not a blockchain
}
/ / get the last block
getlatesblock() {
return this.chain [this.chain. Length-1]
}
/ / create block
addblock (newblock) {
newblock. Previoushash = this. Getlatesblock(). Hash< br />newBlock.hash=newBlock.calculateHash();< br />this.chain.push(newBlock);< br />}
}

4.

Blockchain platforms include Ethereum, Asch and other underlying application development platforms

Ethereum, an open source public blockchain platform with smart contract function, provides decentralized Ethereum virtual machine to process point-to-point contract through its special cryptocurrency ether (ETH)

arch, a decentralized application platform based on side chain technology. Asch is designed to lower the threshold of developers, such as using JavaScript as the application programming language and supporting relational database to store transaction data, which is believed to be very attractive to developers and small and medium-sized enterprises

extended data

in 2008, Nakamoto first proposed the concept of blockchain. In the following years, blockchain has become the core component of electronic currency bitcoin: public account book for all transactions

by using peer-to-peer network and distributed timestamp server, the blockchain database can be managed independently. The blockchain invented for bitcoin makes it the first digital currency to solve the problem of repeated consumption. Bitcoin's design is a source of inspiration for other applications

bitcoin is the absolute mainstream of digital currency, and digital currency is in full bloom. Bitcoin, litecoin, dogecoin, dashcoin are common. In addition to currency application, there are various derivative applications, such as Ethereum, Asch and other underlying application development platforms, as well as NXT, SIA, bitstocks, maidsafe, ripple and other instrial applications

5. Chongqing jinwowo: as for how to build a rigorous database, the method of blockchain is to innovate the structure of the database, divide the data into different blocks, link each block to the back of the previous block through specific information, and present a complete set of data in sequence, which is also the source of the three words "blockchain".

6. That's ten times the survival rate he set. If you lose one, you'll get ten. It's set in the game

7. The way to distinguish Chongqing jinwowo analysis is as follows:
distinguish blockchain from ordinary database;, The main point is that the specific rules for putting data into the database are different. In other words, it can not conflict with other data already in the database. It is only added, immutable, and the data itself is locked to an owner (which can be owned). It is replicable and available. Finally, everyone agrees that the state of data in a decentralized database is compliant.

8. There is no way to sell a large amount of sealed down limit. Anyway, you can only hang up the down limit every day to see if you have paid for it.