The account book of blockchain is infinite

1. blockchain is a new application mode of distributed data storage, point-to-point transmission, consensus mechanism, encryption algorithm and other computer technologies. Blockchain is essentially a decentralized database
for example, if you are a woman, every time your boyfriend says something disgusting to you or promises to buy something for you, you immediately record it and send it to you and all his friends, classmates, colleagues, as well as various groups and circles of friends, so that he can no longer resist. This is called blockchain
the core advantage of blockchain technology is decentralization, which can realize point-to-point transaction, coordination and cooperation based on decentralized credit in a distributed system without mutual trust by means of data encryption, time stamp, distributed consensus and economic incentive, so as to solve the high cost and low cost of centralized institutions Low efficiency and data storage insecurity provide solutions
the application fields of blockchain include digital currency, token, finance, anti-counterfeiting traceability, privacy protection, supply chain, entertainment, etc. with the popularity of blockchain and bitcoin, many related top domain names have been registered, which has a great impact on the domain name instry.

2. That's a good question. Let me give you an example. For example, when I deposit 100 yuan in the bank, the data of this deposit is only recorded in the bank's database, which can't be obtained by others, namely "central bookkeeping". The blockchain is a distributed accounting, a new information recording technology, and it is "encrypted" and "distributed". The data does not exist in a center, but is stored once on the computer of the whole network. For example, if I transfer 100 yuan to you, I will shout to all the computers in the whole network. Let's record the accounts together, that is, "Distributed Accounting".

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. Yes, but the hardware is constantly updated, so basically don't worry. A transaction only takes about 100 bytes, or 100 kb.

5. It depends on the project. Take bitcoin as an example. Now the account book that records all the information of bitcoin network may reach 220g.

6. Blockchain technology will not affect efficiency and waste computing power. The key is to see how to innovate in a mode and how to use blockchain technology efficiently to achieve the effect of the mode
blockchain is essentially an encryption algorithm, which is based on the principle of hash 256 bit algorithm to achieve information security; The application of modern information will become more and more global and universal. Besides the basic requirements of anti tampering, anti repudiation and trustworthiness, the protection of privacy needs to be strengthened. The blockchain technology is proced because of the development of modern cryptography. The cryptography used today is the result of cryptography 20 years ago, Therefore, in order to apply the blockchain technology to more participation scenarios, especially in the Internet economy, more verification is needed to verify whether the existing encryption technology can meet the demand, and more in-depth integration of cryptographic frontier technology and continuous innovation are needed
as long as we use blockchain to make innovations in accounting methods based on our own mode, it will not affect efficiency and waste computing power, but will shorten the time and improve efficiency.

7. NBA 2020 brilliant career, that point can point skills, that is to say, for example, break through the shooting block and so on, these skills can point

8.

Ledger is a book with a certain format and several account pages. Based on the accounting documents, it records all economic business in chronological order and classification, which is what we usually call the ledger. Blockchain represents a unique data record format. Blockchain is "block + Chain". The so-called block is the meaning of data block. Each block is connected by a certain mark to form a chain

Super ledger

hyperledger (Chinese name is super ledger, collectively referred to as hyperledger) is an open source project launched by Linux foundation in 2015 to promote blockchain digital technology and transaction verification. The goal of hyperledger is to enable members to work together to build an open platform to meet the needs of various users from different instries, while greatly simplifying the business process. The founding members of hyperedge include IBM, Intel, Cisco and other large companies. By the end of this book, more than 183 organizations and companies have joined hyperedge, and they are growing rapidly

at the beginning of hyperledger project, Linux foundation has received a number of different code bases, including IBM code base (inspired by Ethereum to a certain extent), Dah (bits of proof bitcoin code base) and sockstream code base (an extension of bitcoin code base). In addition, there are digital asset and ripple contributions. With the development of the instry, a single project has been unable to meet the needs of the business, so hyperledger has graally developed from a single project into a project group. At present, hyperledger is not a specific technology, but a set of blockchain technology frameworks. Up to now, the hyperledger project team contains 9 formal projects and more than 50 moles related to these formal projects

the Xueshuo innovation blockchain Technology Workstation of Lianqiao ecation online is the only approved "blockchain Technology Specialty" pilot workstation of "smart learning workshop 2020 Xueshuo innovation workstation" launched by the school planning, construction and development center of the Ministry of ecation of China. Based on providing diversified growth paths for students, the professional station promotes the reform of the training mode of the combination of professional degree research, proction, learning and research, and constructs the applied and compound talent training system

9. What blockchain technology can't do
the white paper on China's blockchain technology and application development (2016) issued by the Ministry of instry and information technology points out that blockchain is mainly used in the Internet of things, intelligent manufacturing, supply chain management, digital asset trading and other fields, which brings new opportunities for the development of new generation information technologies such as cloud computing, big data, mobile Internet, etc, It may also be able to trigger a new round of technological innovation and instrial change. Open source communities, instry alliances, backbone enterprises, start-ups, investment institutions, financial institutions and regulators are the participants in the development of blockchain technology and applications
as we all know, blockchain technology is first used in the financial field. The identity of blockchain is a decentralized distributed ledger database. Its features of transparent information, secure data storage and transaction process without any intermediary platform are particularly outstanding in this field, especially for supervision, anti-counterfeiting and improving processing efficiency... Blockchain technology seems to be full of unlimited possibilities

in China, financial enterprises, Internet enterprises, it enterprises and manufacturing enterprises also actively participate in the research and development and application promotion of blockchain technology, which makes the development momentum of blockchain rapid. For example, SF Express has been developing and deploying blockchain medicine traceability and UAV medicine transportation services in the field of medicine logistics, and recently it has officially realized the implementation of blockchain medicine traceability
however, no matter how great the role of blockchain is, when a new event or concept appears, we should pay more attention to all aspects of things. You know, the concept of blockchain was born in 2009 with the emergence of bitcoin, and it was not until around the beginning of 2018 that blockchain was graally known in China, and then Alibaba, Internet, thunderbolt and other large enterprises joined in one after another. It took nine years to develop the business that blockchain technology can support, but it seemed to burst out suddenly in 2018, It can even be said that it is the same as the outbreak without warning. Therefore, investors should be alert, and consider carefully whether to invest or not in combination with China's national conditions, social development degree and other factors, when China's domestic blockchain technology is just starting and immature
what blockchain technology can't do is first created by immature technology. At least in China, when blockchain is just emerging, the technology platform is not as good as that of foreign countries, and the business supported by technology should not be widely launched. The technical personnel applying blockchain should be patient, learn more advanced experience, and do things in detail
secondly, blockchain technology cannot regulate the fair, fair and effective operation of blockchain market. For example, as soon as blockchain technology has entered China, there are many fraudsters with the name of blockchain. They raise money and make money. It is difficult for the public to judge the difference between "technological innovation" and "fund-raising innovation", so they are easy to be cheated. Therefore, in the case of blockchain, it's up to time to make the technology independent and controllable and adapt to a variety of scenarios; If we want to make its value controllable, or give full play to its maximum value, it is decided by the supervision of government organizations, regulatory departments, experts and so on
even though the possibility of blockchain technology is infinite, the instry and market under it are in chaos frequently. If we do not list them one by one, there are still too few places that blockchain can "manage". In terms of how to correctly use blockchain technology to do what it should do, people should not be confused first, which shows that the whole society has a long way to go.