JD blockchain technology practice white paper 2018

1. Now there are two kinds of miners. One is to directly choose the mining machine with high income. For example, the income of the A9 is very considerable. It can earn about 620 watts a day, and the power consumption is not high. In this way, if the miner wants to start, it should be done as soon as possible. Only in the previous period can it achieve low cost and high benefit. There will be no such situation when the later period is stable. 2、 The miner doesn't have to pay attention to the current currency income. He only cares about the currency, waiting for him to turn over.

2.

On March 22, jd.com officially released a white paper on blockchain solution, which stated that it aimed to build an integrated intelligent supply chain system, retail network and financial technology with blockchain as the "linker" and its accumulated experience in cloud computing, big data, artificial intelligence, Internet of things and other new technologies, so as to shorten the distance between commodities and customers, and under the guidance of the group strategy of unbounded retail, Fully open their own blockchain technology accumulation

Zhang Chen, chief technology officer of Jingdong group, said that in order to promote the development of blockchain technology and the combination of various business scenarios of Jingdong group, and use blockchain technology to promote the recording, flow and exchange of value big data, Jingdong group has cooperated with various internal functions, technologies and business systems to carry out special research on the development trend of blockchain technology and application, The white paper on technical practice of Jingdong blockchain (2018) has been compiled. The white paper summarizes the development status and direction of blockchain core technology in Jingdong group, shares typical application cases of various business landing practices of Jingdong group, and puts forward relevant suggestions for blockchain technology development roadmap and standardization roadmap

3.

Blockchain is a new application mode of distributed data storage, point-to-point transmission, consensus mechanism, encryption algorithm and other computer technologies. The so-called consensus mechanism is a mathematical algorithm to establish trust and obtain interests between different nodes in the blockchain system

blockchain money making methods:

1. Promotion to earn commission

the method of blockchain is to first register the exchange account, generate your own invitation link, and then promote it. If someone registers the exchange through your link and generates a transaction, you will have a commission

2

currency speculation is like stock speculation. Currency speculation is the lowest threshold for blockchain to make money

3. Mining

Mining in bitcoin is the process of bookkeeping. This process needs to be tackled. If you seize the opportunity of bookkeeping right, there will be a reward. The reward is bitcoin. This behavior is called "mining"

4

wallet is the infrastructure of the block chain, just like the "Alipay" or "WeChat payment" of the block chain. p>

development materials:

1. Blockchain is an important concept of bitcoin, which is essentially a decentralized database and the underlying technology of bitcoin. Blockchain is a series of data blocks generated by cryptography. Each data block contains the information of a bitcoin network transaction, which is used to verify the validity of the information (anti-counterfeiting) and generate the next block

2. The blockchain was born from the bitcoin of Nakamoto Tsung. Since 2009, there have been various digital currencies similar to the bitcoin, which are all based on the public blockchain

On January 20, 2016, the digital currency seminar of the people's Bank of China announced that the research on digital currency has achieved phased results. The meeting affirmed the value of digital currency in recing the issuance of traditional currency, and indicated that the central bank was exploring the issue of digital currency. The expression of the digital currency seminar of the people's Bank of China has greatly enhanced the confidence of the digital currency instry. This is the first time that the five ministries and commissions of the people's Bank of China have expressed a clear attitude towards digital currency since they issued a notice on preventing bitcoin risks on December 5, 2013

blockchain network

4. How hot is the blockchain? Even my mother knows this word, and many people around me also ask me about it
in fact, their real idea is to know how to make money. After all, how much has bitcoin gone up in recent years when all kinds of information came out on the Internet, and to what extent has blockchain become popular today, Internet companies in all halls have joined in. As ordinary people, they also want to splash in this "pond"

so what is blockchain< In a broad sense, blockchain technology is to use blockchain data structure to verify and store data, use distributed node consensus algorithm to generate and update data, and use cryptography to ensure the security of data transmission and access It is a new distributed infrastructure and computing paradigm to program and manipulate data by using smart contracts composed of automated script code
in short, blockchain is a decentralized distributed ledger database. Decentralization is different from the traditional way of centralization. There is no center, or everyone is the center; Distributed ledger database means that the recording method is not only to store the ledger data in each node, but also to share and the data of the whole ledger synchronously. At the same time, blockchain also has the characteristics of disintermediation and information transparency
let's give an example. For example, in our usual online shopping, after placing an order, our money will be transferred to the intermediary platform of the third-party payment agency. After the seller delivers the goods and the buyer confirms the receipt of the goods, the buyer will inform the payment agency to transfer the money to the seller's account
however, the transaction mode supported by blockchain technology is different. Buyers and sellers can trade directly without any intermediary platform. After the transaction between the buyer and the seller, the system publishes the transaction information in the form of broadcast, and all hosts receiving the information record the transaction after confirming that the information is correct, which means that all hosts have done data backup for the transaction. If there is a problem with the orders proced by this machine, its data information will not be affected, because there are countless machines backing up data at the same time
when it comes to blockchain, we have to mention bitcoin, as if you don't understand anything without putting the two together
in fact, although blockchain is a blockchain and bitcoin is bitcoin, most of the people concerned are
concerned about bitcoin, and not many people are concerned about blockchain. Even if he says that he is concerned about the chain, in fact, that is to make do with the excitement. What the other party is more concerned about is which kind of currency makes more money. How can I join in
in fact, what I want to say is that you don't have to catch up with every outlet. If you don't catch up with the stock market, we media, wechat business and artificial intelligence, so will the blockchain. New procts will soon replace it
What's the role of blockchain in making people so obsessed? Let's take the above shopping example to illustrate that the so-called bilateral transactions are not absent now, but they are both bilateral transactions. What if one of them does not deliver the goods to you after receiving the money, or if he does not accept the account after receiving the money
How can blockchain solve this problem
it's also a transaction, but in the process of transaction, everyone knows that the other party has given you the money, and you can't deny it. In the final analysis, it's a matter of credit value
what can blockchain bring us? Once there was such a news in the society that how to prove that your mother is your mother. Even if we have the ID card account book in our hands, we still need a government agency to identify it, which is cumbersome
with the help of the regional payment chain, we can establish credit with low cost through mathematical principles rather than centralized credit institutions. In this way, our birth certificate, household register and real estate certificate can be verified on the blockchain. Your mother is your mother's problem
another example is the food safety problem that has been implemented at present, and the rookie tmall Jingdong has started to use it. With the help of blockchain technology, a reliable mechanism has been established for all transactions, which enables procers, suppliers, processors, distributors, retailers, regulators and consumers in the food chain to obtain the source and status information of food at any time, so as to facilitate the tracking of contaminated food, accelerate the removal of problem food from shelves, and effectively prevent the spread of food safety problems
when consumers buy food, they can easily see where the food they eat comes from, how long it has been proced, and what fertilizer they have applied. For the arrival of blockchain, whether we are ready or not, we still have to see if we are not ready

5.

A: the main application fields of blockchain technology are finance, Internet of things and logistics, public service, digital right, insurance and public welfare

First, in the field of finance,

blockchain has great potential application value in international exchange, letter of credit, equity registration, stock exchange and other financial fields

Second, the Internet of things and logistics

blockchain can also be naturally combined in the field of Internet of things and logistics. Through blockchain, we can rece logistics costs, trace the proction and delivery process of goods, and improve the efficiency of supply chain management

Third, in the field of public service, blockchain is closely related to people's proction and life in the fields of public management, energy and transportation. However, the centralization of these fields also brings some problems, which can be transformed by blockchain

Fourthly, in the field of digital right, through blockchain technology, works can be authenticated to prove the existence of text, video, audio and other works and ensure the authenticity and uniqueness of ownership

In the field of insurance, insurance institutions are responsible for fund collection, investment and claim settlement, and often have higher management and operation costs

Sixth, the data stored on the public welfare field

blockchain is highly reliable and tamperable, which is naturally suitable for social public welfare scenarios. The relevant information in the public welfare process, such as donation project, collection details, fund flow, recipient feedback, etc., can be stored on the blockchain, and can be made transparent and public, which is convenient for social supervision

6. What you see and understand is completely correct. Now all those who are playing blockchain are all such deceptive things. They are just playing a slogan instead of a real blockchain. Big regular companies are playing this slogan to cheat people. They are very speechless

7. For example, Hangzhou shimai Environmental Technology Co., Ltd. has made great progress in the instrialization of blockchain. The core technology of the company is the carbonization car with 26 patented technologies, which can solve the problem of harmless treatment of sick pigs and dead pigs caused by African swine fever. Through the movable characteristics of the carbonization car, the public food safety problem can be eliminated from the source of farmers in one stop. First of all, this mature technology has achieved good results, and has signed cooperation agreements with many local governments and relevant departments. Secondly, Hangzhou shimai has taken the lead in establishing a data center to transform all the carbonization vehicles of the company. The actual operation process of each vehicle has realized the distribution record, each dead pig has been photographed on the chain, the corresponding hash value has been generated, the whole process is traceable and traceable, and the advantages of blockchain technology have been used to ensure the whole process of harmless treatment.

8. According to the learning order, it will be more systematic and efficient:
(1) establish the outline understanding of blockchain through more popular reading materials
(2) get to know the elder: bitcoin
(3) learning: Ethereum and EOS
(4) learn several projects that you are interested in and have a thorough understanding of at least one project white paper
(5) expand learning through relevant media channels, and constantly enrich their own relevant knowledge

in the eyes of many newcomers, blockchain is almost equal to bitcoin, so it is necessary to understand the overview of blockchain first, just like taking a book and looking at the directory first to know what it contains, rather than reading the first page. After the first step of learning, we have a vague concept of bitcoin, blockchain, exchange and wallet. Hands on practice is the best way to improve learning motivation and efficiency. It can also put forward more practical questions in practice and find answers with questions. The learning effect will be better. Therefore:

(1) choose an exchange, such as: huobi.pro, okex.com, BIGone, otcbtc, etc., register an account. In this process, we need to pay attention to the use of Google verifier
(2) buy a little bit, such as 0.03 bitcoin. It is recommended to buy it through C2C OTC trading and usdt trading pair, and be familiar with the two ways of purchasing
(3) download and install wallets, such as Bitian, and pay attention to the storage of mnemonic words
(4) transfer a bit of bitcoin from the exchange to the wallet

after completing the operation of the above process, you will have personal experience of the exchange, wallet, private key, OTC trading, etc<

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