Blockchain bookkeeping app

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. As for the business process and technology of digital asset trading system development, we thought for a long time that 80% of blockchain implementation needs business process changes, and 20% needs to find the technology behind it. In fact, a good project and a good market need the support of a strong technology research and development company. At the same time, you also need to have enough ambition to deal with the bottlenecks in the process of changing the business process. This month, the Hong Kong Securities Regulatory Commission (SFC) issued a new rule on digital assets, including the digital asset portfolio under the supervision of the SFC, and launched a "regulatory sandbox" plan for the digital asset exchange to study whether the digital asset trading platform can be regulated. The exchange development company believes that this news has a clear direction for those in the instry who need to manage digital assets and establish exchanges, and explore the sustainable development of digital assets and blockchain ecosystem. In the instry, doubts about digital assets and blockchain technology have been rising and falling, but the combination of blockchain and various applications has never stopped. Especially in Hong Kong, more market participants believe that this distributed network consensus mechanism is a disruptive technology. In view of the future development of exchanges, the key points of licensing adaptability are very beneficial to the global joint governance of the global market of digital assets. The entry of Wall Street tycoons such as the New York stock exchange means that the main force and "regular army" of professional level are running to enter the market to lay out digital assets, which indicates that bitcoin is more and more valued by professional financial investment institutions, and bitcoin will become more and more popular and be recognized and accepted by more people. The financial instry first embraces blockchain technology. This is mainly e to the high degree of centralization of traditional financial instry. There are a large number of centralized credit intermediaries and information intermediaries in the chain of traditional financial instry, which slow down the operation efficiency of the system and increase the cost of capital flow. Any "exchange" should be a big data company. In essence, it should be a data analysis company. It must know what time and space, what driving force, what transaction frequency, what expectation and what path users obtain information to decide the transaction
the foreign currency trading platform is built, and the blockchain digital currency exchange develops the following trading forms of blockchain exchange: 1. Price limiting transaction: price limiting buy / sell refers to that the user sets the price and quantity of a buy / sell currency, generates a commission order, and the system will automatically match the buy order and sell order in the market, Once the price set by the user is reached, the transaction will be executed automatically according to the priority of price and time. Yuanzhongrui exchange system development 2. Market price trading: market price buying refers to that the user only sets a total amount, generates the order, matches from the beginning of selling to the completion of the total amount. Selling at market price means that the user only sets the total number of currencies to be sold, generates a commission document, and matches it from the beginning of buying to the completion of the total number of currencies transaction. 3. Currency transaction: currency transaction is mainly aimed at the transaction between virtual currency and virtual currency, in which one currency is used as the pricing unit to purchase other currencies. The currency transaction rule is also to complete the matching transaction according to the price priority and time priority. 4. C2C transaction: both sides of the transaction release the transaction information of buying or selling coins on the C2C transaction platform according to the demand. The buyer and the seller complete the transaction offline according to the agreed payment method, and the platform, as an intermediary, charges a certain proportion of the handling fee from each successful transaction. 5. OTC OTC trading: it is a set of platform for offline purchase of digital currency independent of the exchange. Anyone can publish purchase / sale advertisements on the platform. The purchase / sale users can purchase / sell through offline transfer. After the transfer, the platform will transfer the frozen digital currency to the buyer
What are the characteristics of digital currency trading system 1) Digital currency trading system has rich functions, powerful and practical. The unique full interface functions of fast recharge, cash withdrawal, cash charging and cash withdrawal can provide customers with the most convenient means of fund transfer 2) Using the blockchain technology, and in-depth running safe and reliable price limit, market price, plan three transaction modes, a variety of free combination of transaction modes, fully covering the needs of users, using exclusive advanced algorithm to complete the transaction automatically 3) Digital currency trading system platform back office proprietary accounting mechanism to monitor the funds of all users, as well as multi-dimensional exclusive reports, to ensure that the funds are accurate. The so-called development of digital currency trading system can also be called a development project with blockchain technology as the core and other technologies as the auxiliary. You should also understand this sentence. In fact, blockchain technology is the most important technology in the development of trading system 4) Proprietary powerful log management to fully grasp the system state, to ensure the stability and security of the system 5) Digital currency trading system features user-defined settings, free and flexible system configuration and dynamic management of the foreground website, which brings great convenience to the use of the platform 6) Procts can use the existing virtual digital currency in the market, or can be customized according to their own needs, and then issue a variety of different algorithms of virtual digital currency, using the unique hot and cold wallet multiple encryption storage technology to ensure the security of virtual digital currency. Foreign currency exchange platform construction and blockchain digital currency exchange development

4. 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 />}
}

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.

If bitcoin represents blockchain version 1.0, it proves to the world that digital currency can be realized. Then Ethereum represents blockchain version 2.0, which lets you know more about the play of blockchain, decentralized applications and smart contracts. In 2018, blockchain will enter the stage of 3.0, application and scenario landing will be the core of blockchain, and blockchain based applications in various instries will spring up, which will be the early dividend period of the last stage of blockchain development. The demand for talents driven by the application of blockchain technology has become increasingly large. Blockchain technical talents have become the new professional talents, which are highly competitive, and also have enviable high salaries

whether to form a meaningful large-scale consensus: one of the outstanding advantages of blockchain is that it can effectively form a large-scale consensus by opening account books and notifying the whole network. At present, there is no need to form a network wide consensus for many projects. Some projects are just for crowdfunding and token issuance. The blockchain consensus of projects is meaningless. Does this model have network effect: network effect means that a project will become more and more valuable with more and more users of the project, because the value of the project is not in the users themselves, but in the connection network between users. Bitcoin is a typical example. The more user nodes there are, the more links between nodes will grow exponentially, and the whole ecosystem of bitcoin will be more valuable

of course, in addition to these points, there are many basic principles to judge the project, such as effective incentive mechanism, strong team, project solving pain points, and so on

8. MD5? That is to check the integrity of BT files, authenticity, must have seeds to be able to download

9. 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