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High school mathematics blockchain

Publish: 2021-05-28 07:45:20
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the birth of bitcoin
the birth of bitcoin should be on November 1, 2008. A man with the pseudonym of "Nakamoto Tsung" published a paper on the Internet. In this paper, he described in detail a new monetary system, which he named "bitcoin"

then, on January 3 of the next year, the first bitcoin program was born in the hands of Nakamoto Tsung, along with the first 50 bitcoins from mining. After that, he began to fade out until he disappeared completely

so far, people have not found out the real identity of this person, even if today's operators, Internet giants and the government have firmly grasped people's behavior on the Internet

he often switches between American and British English when he speaks. He goes online at different times of the day at random to hide his nationality and time zone; He hides his IP address, encrypts his email, and deliberately forges some writing and speaking styles to confuse the public; Besides, he is also an expert in cryptography. By the way, the place where he published his paper is called & quot; Cryptography mailing list & quot

so bitcoin was born with a hacker spirit: against the censorship imposed by any force

of course, we can also see that if a hacker who invented the anonymous currency system can't be anonymous, the whole thing will become a joke< But fortunately, Nakamoto didn't let us down

1. What is currency
I find that I can't run this section in any case to clarify what is bitcoin. I am not an expert in the field of economics. I can only talk about this issue in a very superficial and intuitive sense However, as far as the theme expressed in the title is concerned, it seems to be enough)

it has been mentioned in senior high school textbooks (remember?), Money is the medium to store value. If a thing wants to become money, it must meet the following requirements:

1) scarcity

that's why gold can be used and sand can't be used as money. Scarcity can be understood as the difficulty of obtaining it. The more scarce it is, the more difficult it is to obtain it. An intuitive understanding is as follows: assuming that your monthly salary is 5000 yuan, it means that the scarcity of RMB is just such a degree, that is, you have to pay a month's labor to get 5000 yuan. You won't agree to pay your salary with 5000 grains of sand, because instead of working for a month to get it, you can easily get it by walking around the beach

how does the current financial system guarantee the scarcity of money? Control distribution. The issue of money is firmly in the hands of the central bank, so that the amount of money can be controlled (so you now know that it is illegal to print money without permission). Back to the example just now, you agree to pay you a month's salary with 5000 yuan because the circulation of RMB has just reached this level. If the circulation of RMB doubles and the scarcity decreases, you should ask for 10000 yuan to pay your salary (but the response of the market is often not so fast. During this period, your wealth is actually deprived - your labor should have received 10000 yuan, but only 5000 yuan in return)

2) transactional

of course, the purpose of currency is to trade. As many people tell you, money is spent, not brought into the coffin. So in addition to meeting scarcity, the more convenient it is for a thing to trade, the more it meets the standard of ideal currency. Therefore, in the history of currency, silver dollar has replaced shells, paper money has replaced silver dollar, and digital currency is graally replacing paper money

the "transaction" here refers to the transfer of property from one party to the other, that is, the decrease of one party's property and the corresponding increase of the other party. For physical currency, it happens very naturally. A wants to give 100 yuan to B. when the 100 yuan note is transferred from a's hand to B's hand, the transaction is completed. A's property is reced by 100 yuan and B's property is increased by 100 yuan. There is no third party involved in this process, which is completely a private act between a and B; However, when the transaction takes place at the level of digital currency, it is not so simple. Party A has to give 100 yuan to Party B. how can we ensure that the transaction is completed? Suppose that a and B record their wealth on their respective computers, how can we ensure that when B adds 100 yuan to them, a actually subtracts 100 yuan from them? Now we have to bring in a third party - the guy we call the bank. When a wants to transfer 100 yuan to B, he doesn't directly give it to B, but to the bank, "please transfer my 100 yuan to B", so the bank dected 100 yuan from a's account and added 100 yuan to B's account Let's assume that it generously does not charge any transaction fee)

the above is a rough model of modern monetary system. The biggest disadvantage of this model is that people have to trust a central system

the transaction of digital currency must rely on the bank, and a person's bank account number may be censored, restricted or even deprived. When one party wants to transfer his wealth to the other party, the bank can charge a high fee or refuse directly (for example, you try to remit a sum of money to a relative in the United States)

the issuance of money must rely on the central bank. Well, it's a well-known secret: the currency has been devaluing, or over issuing (think of the $100 20 years ago and the $100 now). I quote two paragraphs, one of which is Keynes's saying, "through a continuous process of inflation, the government can confiscate a part of citizens' wealth secretly and unknowingly. In this way, we can deprive the people of their wealth at will, while making the majority poor, we can make the minority rich, Another paragraph, from Hayek, "the government can not restrain the impulse to issue money indiscriminately."

is it possible to design a monetary system in which we do not need a central institution and are not forced to trust any third party, so as to make the issuance of currency transparent and controllable, and the transaction of currency private and secure

guess what

2. What is bitcoin
so we can now answer that bitcoin is an e-money system with decentralized distribution and transaction. In this system, the circulation of money is transparent and predictable, and the transaction of money uses the cooperation of the whole network to ensure the security of the transaction

next, I will graally dismantle the principle of bitcoin. It should be noted that bitcoin, as a proct already in use, has a lot of details. The purpose of this article is to explain the basic principles of bitcoin to readers without technical background, so these details will not be covered. For example, the address of the wallet is not the public key, but the second hash value of the public key; The difficulty requirement of blockchain is not to hash all the contents of blockchain once; wait. But for the sake of brevity, without affecting the explanation of the basic principles, these are simplified. I hope you can understand them

2.0. Bitcoin network is composed of many nodes running bitcoin programs
bitcoin is a network composed of many equal nodes

a node is a bitcoin program. Any machine that can connect to the Internet and have certain computing power can run this program - so your home computer can also be used as a node in the bitcoin network:)

nodes can communicate with each other. At the same time, bitcoin has a set of mechanism that allows a node to send messages to all other nodes, This behavior is called "broadcasting."

2.1. Blockchain - a public account book
let's go back to the example of banks. The most basic function of a bank is to maintain an account book, which only needs to record every transaction truthfully. For example, Wang Xiaoming transferred 30 yuan to Zhang Damao on X, year X; On y, y, y, y, Zhang Da Mao transferred 12 yuan to Li Xiao Dou, and so on. According to this account book, we can find all the transaction records of a person, so we can calculate the current account balance of the person. For example, since Li Xiaodou started to build a bank account, the total amount of transactions transferred in is 500 yuan, and the total amount of transactions transferred out is 300 yuan. Then it can be calculated that the balance of Li Xiaodou's account must be 200 yuan at this time

maintain this account book, and as the only maintainer (only the bank has the right to view and modify), the bank's responsibility as a trading center is completed

bitcoin also has an account book, but unlike banks, this account book is open and anyone can view and review it

this account book is called & quot; Blockchain & quot;. You can think of blockchain as a pamphlet. Every page of the pamphlet is full of transaction information, and new pages are constantly added<

2.2 Wallet - an account composed of a pair of public keys and private keys
the above section explains what a bitcoin account book is. This section will explain the ownership of funds in this account book, that is, the account system of bitcoin

there are essential differences between accounts in bitcoin and bank accounts

under a bank account, the bank records the identity information of the owner of the account (think back to the information you submitted when you went to the bank to open an account: photo, ID card, telephone number, home address...), so as long as you can prove your identity to the bank, you will get the ownership of the property under your name. In this model, the bank plays the role of an omniscient God: he knows the wealth information of real people. We have no choice but to pray to God not to let our information out or use it for evil

in the world of bitcoin, there is no such institution as bank, which will not force people to reveal their identities in exchange for the security of funds. Bitcoin's account is simply composed of two strings of numbers, which are called "public key" and "private key" respectively, and there is nothing else

the mathematical characteristics of these two numbers - a data encrypted by a private key can only be decrypted by a public key, so-called asymmetric encryption - enable them to perfectly implement the functions required by an account (called a wallet in the bitcoin world)

we take the public key as the account address - also known as the wallet address in the bitcoin world - which is similar to the account number in the banking system, that is, when you tell someone "please call 300 yuan for my account number", you need to tell them. For the bank, it is "China Merchants Bank 6214850200251100", compared with the special currency, it is "

the private key is the * only * certificate to prove the ownership of the wallet. You can hold it by proving that you are the private key of the wallet
2. In service MBA is still very good to test, test out is useful< Br > if you are in the process of starting a business and want to go public, you need to publicize your ecation background. At this time, the working people can choose to take an MBA. Because of the limited time, the MBA free from joint examination is the best choice. The training of in-service graate students includes course study, course examination, degree application, national unified level examination, thesis writing, and so on Thesis review and thesis defense< Br > for more information, you can consult relevant ecational institutions. Take the Dutch business school as an example. The Dutch business school is an application-oriented university recognized by the Dutch government and one of the largest business schools in the Netherlands at present. BSN focuses on degree learning and enterprise management training above graate level. With its excellent ecation quality and successful ecation methods, BSN has successively won the awards of nvao, ACBSP, ACBSP Equa has three international certifications, becoming one of the few outstanding business schools in the world with three important international certifications at the same time< Br > for more questions, please contact the customer service of Shanghai Bors Ecation Technology Co., Ltd< br>

3. The successful experience of other attempts will help you a lot
come on< After several days of hard work, Taobao finally opened up a new foreign trade clothing store and wanted to open a store. After a few days, it was not as simple as I imagined
first of all, the biggest advantage of being an online store may not require a lot of investment. It can be easily opened and disposed of with them without having to stay in the store all day
as we all know, there are advantages and disadvantages in everything. A shop that doesn't like has to go through a lot of bureaucratic proceres (shop selection and purchase), but to really open it, we have to consider opening an online shop and business strategy. We don't like opening a physical store. Customers are trying on it. Customers can only create a proct outline through the image and the owner's proct description, To make the things in the store cheap (it doesn't need a lot of cost), but many people prefer to see the store. After all, if it's not suitable, they can't buy it. But generally, the things in the store are bought, and it's very difficult to come back, because there will be an additional transportation cost in the process. I think the shopkeeper and customers are not willing to bear it, so customers who buy goods online will also pay for it, We must consider our own shopping. We should have a clear understanding that we shouldn't buy reckless and unseen pictures. I feel that we have also bought more detailed pictures, which are good for shopkeepers and buyers. After purchasing, we find that we can omit them from our imagination, and finally return to our post, but we can't. I think most shopkeepers will think that this is a headache, Of course, do not want their procts, customer complaints, and finally a bad end

here are three aspects that need to be paid attention to in the marketing strategy of online stores

choose an ideal platform

nowadays, there are many online store platforms, however, it is better not to easily decide to try to say. Whether you build a store for customers to provide a window to understand you, or really want to achieve the goal of e-commerce online store, choosing an ideal platform is a very important step. It's equivalent to renting a counter in a shopping mall, because the business performance of the online store you want to build, good or bad, depends to a large extent on the popularity, traffic, counter and other factors of the shopping mall. Therefore, it's essential to choose a full-featured website platform with convenient management and large visits, Even if it's worth paying a little more than those crowded and desolate sites

however, if this is your first store, or if you choose a website with relatively low rent, the business performance is good or bad, in addition to transportation, there are many other factors, such as the attractive storage layout of your procts or the most appropriate classification, occupying a significant position. If other conditions can't keep up, isn't it wasteful to pay high rent<

safe websites especially recommend

this is actually in their own advertising, and its effect is even too flattering. However, you may have to invest a lot of energy in a job that easily attracts visitors' interests. In addition to its own procts, the layout and decoration of the store may be more important for a loud name, and sometimes you need professionals to design

first of all, don't believe the propaganda of e-commerce platform, the propaganda of "five minutes to build a store", "10 minutes to develop e-commerce", and even cheating "e-commerce" is not so simple. First of all, we must make clear the description of these websites. Their rent may be very difficult (trade secret), so your pictures and descriptions, prices, after-sales service measures, delivery methods, go online, but also the messy storefront arrangement is beautiful and generous. Think about it. Is 10 minutes enough

of course, there may not be many opportunities to get special recommendations from the website, especially at home. When you are fully prepared, don't forget the way you want to fight for you. Don't give up even the promotion opportunities on the classified page
stores apply for an independent domain name

because there are few opportunities to get special recommendations from the website, what's more, people need to better promote their own things that are not as good as their own. One of the most important ways is to apply for an independent domain name for the store

store website, you will be told that this is your dedicated independent application to complete the process of building an online store. You can usually get part of the second level domain name of the website. You can print it on your business card, company brochure, log in to the search engine, of course, from the perspective of function, you can do so. However, from the perspective of network marketing, it is better not to do so. The reason is very simple. The domain name has a strong supplier's online store color. Even in the case of some internet professionals, please refer to the well-known website links in the online store. You will find something wrong. Such a secondary domain name as the company's website to promote negative effects in several ways: first, to cause serious harm to your own company image;, Shop in the same e-commerce platform to establish a lot of this similar website, without its own characteristics and style, it is difficult to give others a particularly deep impression; Third, some search engines may refuse to log on to such websites; Fourth, the network platform is designed for multi site database format. If your online store is not specially designed, many search engines may not be able to retrieve it. In short, it's not easy to promote your own online store

applying for a special independent domain name is the best solution for an online store, however, this requires working with the service provider that you need to point your domain name resolution to your online store. Suppose you have an independent website, it can take a variety of conventional means of network marketing promotion, maybe your online store is famous

the online store has less start-up capital, low start-up cost, flexible operation and convenient transaction, which can provide a good profit margin for operators. Undifferentiated aspects of books, clothing texture, color, size and different numbers, online sales of goods, customers can not try on and many other drawbacks. How should operators overcome these obstacles and successfully sell the clothing gold of this gold mine online

first of all, clothing stores need to find and buy the business status of goods from the perspective of relationship. Clothes "Amoy" yes, the enterprise is very good, otherwise, even if the good relationship with customers, operation method, and then normal, they can not sell clothes. The strong strength of the security brand clothing purchase, cost control and low inventory of the best choice, is also a key factor. For example, diaoli group always adheres to the business principle of "low price mping and beautiful". Its proct line headquartered in China and huge profits are just a small dress. The company is headquartered in China, in accordance with international practice, to establish a comprehensive return system, and commitment: we provide every proct, have strict standards of service quality, rable consumer goods proction full trust

it can be said that the commitment of these well-known clothing brands to consumers is to protect the interests of operators. Series of women's clothing brand, full of warm welcome, the fusion of sexy and warm style design, not only to meet the needs of customer base and market conditions, preferences, full of subtle details, but also began his clothing store in this area of novice, solve the worries. In order to improve the popularity, his store should be properly marketed at the initial stage. For example, bold proct names in the category list, adding pictures to attract attention, can also be used for advertising, such as exchanging links with other stores and websites, at no cost

secondly, online stores earn more than popularity, which also makes customers' word of mouth. On the Internet, every seller has a record integrity, the business of high credit shop is very important, all buyers choose whether to buy your goods, buyer praise is the most effective online store advertising. The foundation of competitive procts, excellent after-sales service, won the praise of an important weight. Sell? First time buyers of goods to get in touch, as soon as possible after delivery to the buyer, send shipping notice letter, it is best to attach a photo, so that buyers can clearly see the above writing and specific number and other information, it is very important to attract "return rate" after the completion of the transaction, from time to time to keep in touch, also with customers, do a good job in customer management
clothing stores are unknown gold mine sellers who know how to use and develop, which will bring huge benefits. Do network sales, integrity first, diaoli people's brand strength as a guarantee, with a sincere heart to treat every customer, there will be more potential opportunities for mining. E-commerce is a global, comprehensive local instry, no matter whether the enterprise is large or small, here is a good development platform< br />
/ a>

10 powerful marketing strategies to improve the clothing of stores

the basic principle of ROI marketing is to achieve the best efficiency in the whole process of transaction, If you have to make some deals, why let potential customers find it on a screen on the Internet? Let them directly access the basic information of the web page they need, so that they have the opportunity to complete this transaction< br /> /> If handled properly, ROI marketing can increase your transaction efficiency tenfold. Here are 10 ways to help you in network marketing, ROI marketing

1, use short, attractive titles. Don't be too abstruse and creative. Please make sure your selling points are focused
2, including strong attraction. If you offer a 10% discount, in order to attract attention, high brightness boldface

3, adjust your creativity according to the browser you are trying to influence. Don't try to sell a $50000 server to a company with only five employees

4, highlight your information and creative focus. If you sell tourist goods instead of focusing on the features of your website, but should focus on what you want to sell

5, use different promotion methods to improve the overall information on your website. Your website has promotions at the top, middle and bottom of the page. On your marketing website, take a look at your creative deal page and be able to make purchases at any time of the day

6. Don't hide, pray for that. If you want people to click, you can tell them

7, take them to where they need to go. Once you capture the attention of potential customers, they have already clicked on your website. After burial, because they still need to click five times to enter the transaction. Give the prospect the opportunity to close the deal immediately. In fact, if you are able to realize the transaction in the initial promotion information, you have an advantage in dealing with the opportunity station

8, keep it simple, once you get a potential customer, instead of having him or her reread the points pointed out in the paragraph. If they need to, then for him
4. Hello, the key is to find the slope Y & #;, The tangent vector is (1, Y & # 39;). Taking the ellipse x ^ 2 / A ^ 2 + y ^ 2 / b ^ 2 = 1 as an example, the derivation of X on both sides of the equation is:
2x / A ^ 2 + 2yy & # 39/ b^2=0 When y is not 0, there is Y & # 39; = 0- B ^ 2 / A ^ 2 x / y, tangent vector is (1, - B ^ 2 / A ^ 2 x / y); When y = 0, the tangent vector (0, 1)
5. Watch maintenance in summer
the climate is hot and humid in summer. When people sweat in hot weather, the watch may leave green or black marks on the wrist when it encounters sweat. Due to the different pH value in sweat, the degree of clock erosion is also different. Therefore, it is an important issue for watch lovers to take the initiative to maintain their watches
watch maintenance in summer
the reason why the watch turns green with sweat is that the watch factory adopts gold-plated copper-clad plating which is easy and beautiful in color, but if the gold-plated technology is not handled properly, it will cause the watch oxidation. Nowadays, PVD stainless steel plating technique is widely used in gold plating of watches and clocks, so it is rarely found. Therefore, it is recommended to buy stainless steel or K-gold materials. As for the problem of wrist blackening when wearing a watch, it is directly related to poor air quality and st stuck in the watch strap for a long time. In this case, it's best to give it to a professional watch shop for cleaning. You should also pay attention to the cleaning of the watch when you wear it on weekdays.
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