区块链行话,《区块链》

区块链技术已经成为当今世界最令人兴奋的技术之一，其可以用来构建分布式账本，实现安全、可信赖的数据存储和交易。而《区块链》这本书，深入浅出地阐述了区块链技术的基础知识和最新发展。

《区块链》从概念、原理、技术、架构等多个角度来介绍区块链技术，深入浅出地讲解了区块链技术的基础概念，如比特币、智能合约、分布式账本等，对区块链技术的应用和发展也进行了深入的讨论。

此外，《区块链》还提供了丰富的实践性示例，帮助读者更好地理解区块链技术的实际应用，包括比特币的挖矿、智能合约的开发、分布式账本的构建等。

另外，《区块链》还提供了一些实践技巧和实用技术，帮助读者更好地掌握区块链技术，比如如何使用比特币、如何开发智能合约、如何构建分布式账本等。

总之，《区块链》是一本关于区块链技术的全面性介绍，无论是新手还是专业人士，都可以从中获得深入的了解。它不仅可以帮助读者更好地理解区块链技术，还可以帮助读者更好地掌握区块链技术，从而更好地利用区块链技术实现自己的目标。

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❶ The difference between listing on a public chain and listing on an exchange

The difference between listing on a public chain and listing on an exchange is as follows:
Going on an exchange: As we all know, in the blockchain In the digital asset trading ecosystem, digital currency exchanges are a very important existence because they are the bridge between project parties and investors. However, in this capital-driven market, as a new thing, the financial sector has not fully accepted it. Although many countries have slowly made changes in their policies, as a thing that challenges the national sovereign currency, many countries are not interested in digital. Currency remains cautious. Therefore, in such an environment that lacks supervision, blockchain and digital currency exchanges are now overwhelming, and there are a lot of random ideas.
In this case, as a digital currency no matter how it is issued, as long as you have a certain amount of traffic and a certain strength, you can generally easily access second- and third-rate exchanges. When encountering mainstream exchanges with slightly stricter audits, in addition to having a digital token system and traffic, find an influential website to endorse it, and then write a "high-end" white paper, which can also be mainstreamed. Exchange. So this is why any currency can be listed on the exchange.
Going to the public network: Once a blockchain is online on the public network, it means that a real blockchain is officially born.
The ERC-20-based token has completed its original mission and needs to be destroyed. The project party will generally convert the original token into the main network currency (Coin) at a ratio of 1:1 after the public network goes online. Based on the definition of coinmarketcapd, coin refers to a cryptocurrency that can be operated independently; token must rely on other cryptocurrencies as a platform to operate.
Before the public network went online, most cryptographic tokens were ERC-20 tokens based on the Ethereum platform, or side chain projects based on other underlying blockchains. Such tokens did not have the ability to operate and mine independently. capabilities, they are equivalent to temporary tokens on other underlying blockchains and have no real economic value.
But the mainnet launch is different. The project will no longer rely on Ethereum or other side chain projects of the underlying blockchain. Instead, it will have its own independently operating blockchain network and be used by developers and developers as an independent individual. User approval and use.
The launch of the public network means that the project ecology has started, and subsequent business activities will be meaningful and will not become a rootless tree.
For example, a large number of DAPPs can be developed on it. The beautiful visions described in the white papers of different public chains have really begun to be tested by users. How to attract more technology developers, absentees (projects using the POW mechanism), and coin holders The participation of investors and the recognition of enterprises and institutions in different industries will bring a great test to the technical and operational capabilities of the project.
So, although the launch of the public network is a milestone, it is only a small step in a long journey of thousands of miles, because the real fight has just begun.

❷ Is there any problem with the bank downloading the digital renminbi?

Hello, I will answer your questions next:
1. It is actually not a big deal if the bank downloads digital RMB. Generally speaking, there is no harm at all.
2. It is issued by the state and ensures safety.
Extended information:
1. What is digital RMB?
In fact, it is equivalent to our Alipay and WeChat, which is a way to pay through mobile phones. In the future, people no longer need to take out banknotes when making payments, they only need to take out their mobile phones to transfer money.
2. How to use digital RMB?
To use digital RMB, you must first download a special APP software. This software is very similar to Alipay, and its functions are basically the same. You put the money in, and then you can open the app when making consumption transfers.
3. Differences from Alipay, WeChat, and bank cards
The first impression of this digital RMB is: "Isn't this just Alipay?" In fact, this is not the case.
1. Alipay bank cards are at risk of bankruptcy.
Alipay bank card is actually an IOU. On the surface, the money is in your name, but in fact it is in your own Alipay account. Alipay just pays for you when you need to use the money. Therefore, this credit risk is very high. If Alipay runs away or goes bankrupt one day, the money will be gone. In fact, the same goes for when we deposit money in the bank. The money we deposit in the bank appears to be yours, but in fact it belongs to the bank. Financially, it appears that the bank borrowed money from you. If the bank goes bankrupt one day, our money will also be lost. Gone.
The central bank’s digital currency is real and is not under the name of any company. It belongs to you just like paper money. It is just stuffing the paper money into your mobile phone. It is 100% safe and completely owned by you. In fact, for every 1 yuan of digital renminbi issued by the central bank, one banknote will be destroyed. The final result will be that one day in the future, all banknotes will disappear and be transferred to your mobile phone.
2. Alipay and banks have risks of cheating
For example, many people have asked this question: If I am an Alipay employee, can I change my data to increase my balance?
Theoretically it is possible, but in practice the operability is very low. Because Alipay has a very complex security system, every transaction is reviewed. If you make changes, the account will be uneven and traces will be left on the data.
But on the other hand, if someone cooperates inside and outside, it is really possible to cheat in the short term. I remember a bank case before. The bank programmer discovered that the balance of the bank card only showed cents, but in fact due to the existence of interest, the real amount reached cents or cents, but it would not be displayed. For example, Aunt Zhang's card showed that there was 3.02 yuan, but there are actually 3.021 yuan. This 0.001 yuan is not displayed, and it will be difficult to detect if it is secretly transferred by someone.
So this clever programmer transferred everyone's cents and cents to his own account and walked away with a lot of money. In the end, an old lady quarreled with the bank, saying that the bank gave her 1 penny less interest, and she had to round up the money with the bank before the incident came to light.
So we have to understand one thing, that is, computers can really cheat.Yes, the reason why no major problems have occurred is because we have many laws and regulations and strict monitoring systems, but hidden risks are always there.
3. Is there any risk of tampering with central bank digital currency?
No, because central bank digital currency is derived from blockchain technology. I won’t say more about the blockchain. To put it simply, the reason why Bitcoin is so popular and no one manages it without causing trouble is because of the characteristics of the blockchain: no one can tamper with it.
The difference between central bank digital currency and Bitcoin
So people will naturally think of one thing, so what is the difference between this digital currency and Bitcoin?
The difference is very big. Bitcoin is a blockchain in the complete sense. It is called a "public chain", which means that no one can tamper with it. This also brings about a problem. For example, if you lose your bank card, you can Go report the loss, but if you forget your Bitcoin account password, you will lose it for life, because no one is in charge of Bitcoin and no one can change it back for you. Similarly, under Bitcoin, the government does not have any regulatory capabilities, and it will eventually become a paradise for crime.
The central bank’s digital currency uses part of the blockchain technology, but the initiative is still in the hands of the government. I am not very clear about the specific details. The general idea is that ordinary people cannot cheat, but the central bank can control it, that is, It is said that if you can’t remember your account password, you can still retrieve it. The so-called blockchain technology is just to improve security.
Why launch digital currency?
Seeing this, everyone will feel that it is unnecessary. After all, banks have been developing for hundreds of years without any major problems. As for Alipay, it is under supervision from top to bottom, so for this so-called "security" To promote digital currency seems to be overkill.
Yes, so the meaning of digital currency is not here, nor is it to compete with Alipay for business.
The difference between digital currency and cash
According to existing news, digital currency was originally used to replace cash (paper money). But I think it will eventually be extended to all forms of currency including deposits.
When it comes to cash, everyone will definitely think that paper money is inconvenient to carry, so it is normal to replace it. They simply think that the meaning of digital currency is limited to "convenience and safety". This is also incomplete.
When we grew up watching movies, we often saw a plot of kidnapping.
What the kidnappers want is cash, and they will emphasize: No consecutive numbers are allowed
Then the question is, why can’t consecutive numbers be allowed?
Because once the numbers are serialized, the police can track the banknotes with this series of numbers. At which store/bank they receive the banknotes with this series of numbers, they will take away the payer. Even if he is not a kidnapper, they can follow the clues. Find the kidnapper. Unconsecutive banknotes are too difficult to trace, and tens of thousands of banknotes are difficult to trace. Therefore, because the banknotes are numbered, each one is different. This "difference" gives the banknotes a traceability function. In theory, if a camera is tied to each banknote, we can Recording every hand it passes through, it has an extremely powerful tracking function. But testConsidering that the number of banknotes is too large and requires people to search for them one by one, this tracking function is so weak that it is almost useless.
But the digital RMB is different. Anyone who has played with Bitcoin knows that under the blockchain, I can see the whereabouts of every Bitcoin. From the time it was mined to the present, every account that has been passed through has traces of what it is doing every minute. check. do you understand? There will be no banknotes in the future. The kidnappers accepted 1 million digital currencies, and every penny of the 1 million was tracked. As long as the kidnappers spent the money, the police would immediately receive an alert, and everyone would know when and where they paid. If you know clearly, you can catch people quickly. Therefore, the real meaning of central bank digital currency is not security or convenience, but traceability.
What’s the point of being traceable? Some people will say, this guy only kidnaps a few times a year? is it necessary? That's right, because this is not about kidnapping, but about money laundering and bribery. In digital currency, every penny has a very detailed list from birth, and you can check who has it in your hands every minute.
So what does this mean?
This means that managers can scan in real time. When it is found that a certain official's name appears in the records of a large amount of currency, even if the official has no money in hand, everyone knows what it means, right? This is a complicated task, but it can be completed in the future with artificial intelligence. After the launch of digital currency, as long as you touch money, it will be recorded forever.

❸ What does Yu’e Bao’s seven-day annualized rate of return mean?

The seven-day annualized rate of return means that if the income is based on the last seven days Let’s calculate the profit if we save for one year.

Reference materials

Network-Seven-day annualized rate of return

❹ Blockchain technology, the business scenario of Bitcoin

The core of virtual currency is virtuality. Whether it is limited virtuality or infinite virtuality, it is virtual. Bitcoin, no matter how bit it is, is also virtual. The same is true for all kinds of other messy virtual currencies.

Virtual things, first of all, rely on network existence. Bitcoin These are network information codes. When it comes to the Internet, it is a bit like the human brain, and Internet information is like our thoughts.

Why do ideas sell for money?

This thing is actually very simple and easy to understand.

For example, there was a young man in the village who suddenly had a good idea to grow food on the land in the village. Then the news reached the ears of the landowner, who thought: I have so much land, this is a good thing. Then he called the young man over and said, tell me what you think and I will give you 50 cents. Then the young man exchanged his idea for 50 cents.

Things like virtual currency,It’s the same as packaging an idea into a PPT to defraud a wave of financing.

Why can you make money selling it?

Mainly because someone believed in the idea and could make money.

Just like many people opening milk tea shops. Opening a milk tea shop was an idea, and then someone packaged it into a franchise concept. For example, it’s called milk tea franchise coins. People think they can make money by buying milk tea franchise coins, so they buy them. As for whether you can make money? It depends on whether there are other people who believe like you that you can make money selling milk tea. As long as other people believe it, you can make money selling it.

Just like some children, I ran home and told my father: Dad, I have a good idea. Many people are working on it and they are making money... Balabala 10,000 words. Then his father was convinced and felt that it was indeed possible, so he paid for his son. Isn't this just my idea of ​​spending money to buy my son?

Now everyone understands why virtual coins can be sold for money.

The core point is because of the nature of virtuality.

As mentioned before, no matter whether it is Bitcoin or any currency, the most core one is virtuality.

What does the virtual property mean?

Of course, it has a high degree of freedom. Just like your thoughts, you can fly wildly and travel thousands of miles in a day.

But virtuality has no borders, while entities have borders.

When virtuality can be sold for money, coupled with its high degree of freedom, it becomes a matter of spending money to buy an idea in your own village, and then going to another village to sell it. As mentioned above, entities have national boundaries. The existence of national boundaries represents a series of competition rules derived from national boundaries. Policy rules such as tariffs and exchange rates.

In the past, people from other villages came to our village to rob us. They could not take away the things they robbed, and there were various restrictions at the entrance to the village. Now, use what you robbed to buy some ideas, and then leave the village in a big way. Wait until you return to the next village before selling your idea.

At this point, everyone should stop asking why you can go to the next village to sell your ideas. Read the previous paragraph to understand why ideas can be sold for money.

What else does virtual represent?

It means that if there is a problem with the physical carrier, it will be wiped out. For example, for that currency, the network cable of the trading center was unplugged. Network information, the network is gone, what is the use of network information?

However, when the virtual world has no borders and the entities have national borders, the current international politics is so complicated. There are many contradictions. If you buy so many ideas in this village and want to sell them in the next village, what if?The village next door dug up the road for you, but you still sell it.

No matter how many ideas a person has, as long as someone kills you, the ideas will be gone. Some people may say that the core of blockchain is decentralization, that is, everyone knows one person’s thoughts. If you kill No. 1, there will also be No. 2, No. 3, and No. n.

But no matter how many numbers there are, it is useless. In a word, it is an idea and it is virtual; it is also virtual if you put it in anyone's head. There is still a long way to go from the basic disk of carbon-based life to the basic disk of silicon-based life. Any virtual existence that is not bound to an entity is an illusion. Unless there is academic theory that subverts the existing material world.

In the past, there were a lot of news about cloud data problems, such as deleting databases and running away. They are all restricted entities. Even if it is The Matrix, you have to have a physical petri dish.

Finally, we are also going to launch a digital currency, which is supported by the entire political framework. How can you allow others to sleep peacefully under the couch?

❺ What is the current development status of the study tour industry?

What is the current status of the study tour market and industry? What new trends and characteristics have emerged? Under the influence of the global COVID-19 epidemic, consumers have put forward new safety requirements for study tours. People pay special attention to epidemic prevention safety during study trips or activities. In addition, in the face of the development potential presented by the study tour market, new trends have emerged in the competition in the study tour market. Large institutions have begun to pay attention to brand building, and study tour or study alliances have emerged horizontally and vertically. Companies continue to join the ranks of study program providers by changing careers or investing in new establishments.
The study tour industry will develop rapidly in the next 10 years, and its policy dividend period will also last for a long time. Some professionals predict that study tours will promote the listing of no less than 100 professional companies. At the same time, with the implementation of various study and study policies and the continuous release of market demand, study tours are becoming a hot topic. With the new model of Internet+ and the maturity of blockchain technology, the "study + blockchain" model is bound to be another highlight of study tours! As a comprehensive Internet+ platform that combines study tour products with post-study education, the emergence of Guangzhou Study Tour World has solved the market pain points of study tours, integrated online and offline, and opened up the barriers between study tours and the Internet. Yanxue Tianxia will also continue to increase the development of online research and blockchain technology to promote the comprehensive implementation of China’s study and travel education services.