没有私匙能玩区块链吗

近年来，区块链技术受到了越来越多的关注，被称为“互联网的未来”。但是有人想知道，没有私匙能玩区块链吗？下面就来给大家介绍一下，没有私匙能玩区块链的三种方式：

1、公钥/私钥

公钥/私钥是区块链技术中最基础的安全技术，也是最重要的安全保障技术。简单来说，公钥是一个人的身份证明，私钥是一个人的身份凭证，只有拥有私钥的人才能够使用区块链账户。因此，如果想要玩区块链，必须拥有公钥/私钥。

2、代币

代币是区块链技术中的一种虚拟货币，它可以在区块链网络上进行交易。代币可以用来购买和出售各种物品，也可以用来投资区块链项目。因此，如果想要玩区块链，可以购买一些代币，然后使用它们进行交易。

3、智能合约

智能合约是区块链技术中的一种自动执行的程序，它可以在没有中介的情况下实现双方的财务交易。智能合约可以被用来实现购买和出售物品，也可以用来参与投资项目。因此，如果想要玩区块链，可以使用智能合约来实现财务交易。

以上就是没有私匙能玩区块链的三种方式，如果想要玩区块链，可以使用公钥/私钥、代币和智能合约来实现。有了这些技术，就可以轻松地参与到区块链技术中去，体验其中的乐趣。

请查看相关英文文档

⑴ What is the relationship between blockchain private key, public key and address?

The relationship between blockchain private key, public key and address is the generation of private key Public key, the public key is converted into an address. So the private key is the most important. The three are irreversible. The address cannot generate a public key, and the public key cannot be converted into a private key.

The blockchain address is again, which usually consists of a string of letters and numbers of 26 to 35 characters. The blockchain address is mainly derived from the public key, block The chain address is equivalent to the bank card number we usually use. It can be disclosed to anyone with no security restrictions. Its main function is to receive and send digital assets on the blockchain.

Blockchain technology is now in its early stages of development, but because of its decentralization, security, non-tampering and other characteristics, it may have killer-level applications in life and work in the future and has attracted much attention from various countries. Pay attention to. This article is for reference only, please leave a message for discussion.

⑵ [Cat Talk] There are two keys to open a Bitcoin wallet: private key and public key

If you don’t understand the blockchain, you don’t know the basics of public key and private key. The concept of owning a wallet is like poking a crocodile in the head with your finger, for newcomers in the currency circle, it is extremely risky. This article is dedicated to new friends in the currency circle to help you sort out the basic common sense of Bitcoin wallets.

Blockchain Observation Network mentioned in the article "What is Blockchain" that in the blockchain world, everyone has two unique virtual keys: public key and private key.

"Public key" can be simply understood as a bank card, which can be sent to the counterparty of the transaction. The bank card number is equivalent to the "address" used in Bitcoin transfers.

To put it more professionally, the public key is a 65-byte string. How long is it? 130 letters and numbers piled together. If the public key is too long, firstly, it will be too troublesome to make transactions. Secondly, why do you have to expose the true content of the public key? This is like taking out your bank card and showing it to others everywhere. Therefore, the address we see now is a shorter public key generated by the digest algorithm.

The other party can send you money only if they know your address; moreover, anyone who has your address can check the number of transactions (No. Transactions) of this wallet address on the official website of Blockchain.info, and receive How many Bitcoins have been received (Total Received), and how many Bitcoins are left in the wallet (Final Balance), as shown below:

"Private key" is like a bank card that cannot be told to others. password. It is a string of 256-bit random numbers. Because it is particularly inhumane for non-IT users to remember this binary private key full of 0s and 1s, we processed this large string of private keys and finallyThe private key is then presented to us as a string starting with 5/K/L.

The relationship between public key, private key and address is:

1) Private key → public key → address

The private key generates a unique corresponding public key key, and the public key generates a unique corresponding address;

2) Private key encryption, public key decryption

In other words, A uses the private key to encrypt the transaction information (digital signature ), B uses A’s public key to decrypt the digital signature.

Among them, the private key is an extremely private thing. If you send your private key to someone else, start writing a novel now. The name has been decided for you, and it will be called "Farewell, Bitcoin."

If you are a currency circle boss like Mr. Li Xiaolai (who is said to own hundreds of thousands of BTC online), it is strongly recommended to use a cold wallet (offline wallet) and store it separately; the rich people on TV have their own in the bank You can also refer to the safe if conditions permit.

At that time, the above method was the safest approach. But as the successor of Leek, let’s assume for the moment that we only use idle funds and hold a small number of Bitcoins, for example, less than 5. Then, cold wallets that cost thousands and are complex to operate are a bit overkill; therefore, Blockchain Observation Network limits the choices to exchanges and light wallets:

On the trading platform If you buy (a very small amount of) Bitcoin on the exchange, you can continue to store it on the exchange without withdrawing it. This method is most suitable for newbies in the currency circle. Before we have a deep understanding of the story behind each cryptocurrency, we are always full of curiosity. Bitcoins placed on the exchange can be directly traded. The transaction is simple and fast, without the need to go through a digital wallet. ; On the other hand, the platform has a complete range of currencies, which can satisfy our early adopter mentality and make it easy to try out our skills at any time.

Moreover, large exchanges such as Huobi and Binance (which have been blocked) not only have a much higher security level than some small platforms designed to harvest leeks, but are also simple to operate and can be used quickly. To get started, you only need to keep your account and password safe (for a higher level of security, turn on Google two-step verification), and leave the rest to the platform.

It is worth noting that the assets stored on the exchange do not entirely belong to ourselves, but rather are lent to the platform. The number we see in the asset column is equivalent to the platform providing us with A white note for borrowing money. In addition, the trading platform itself is not decentralized. If security measures are not in place, users’ account passwords may be obtained by hackers.

Light wallets are relative to "full node" wallets.

Full node wallets, such as Bitcoin-Core (core wallet), need to synchronize all blockchain data when running, which takes up a considerable amount of memory.Storage space (currently at least 50GB or more), completely decentralized;

Although the light wallet also relies on other full nodes on the Bitcoin network, it only synchronizes transaction data related to itself, basically achieving decentralization At the same time, it also improves the user experience.

According to different device types, we divide light wallets into:

1) PC wallet: suitable for computer desktop operating systems (such as Windows/MacOS/Linus);

2) Mobile wallet: suitable for Android and iOS smartphones, such as Bitether wallet (Ethereum also has a PC version);

3) Web wallet: accessed through a browser, such as mentioned above The web version of blockchain.

Light wallets are relatively simple to operate and are generally available for free. When applying for a wallet, the system will generate a private key. Get ready to hit the blackboard!

1) Do not take screenshots or photos and store them in your mobile phone;

2) Do not send private key information to anyone;

3) It is best to handwrite (a few words) copy) and hide it where you feel safest.

In a word, whoever masters the private key of the wallet has absolute control of the wallet. As long as the private key is in your hands, your Bitcoins will never be lost.

Finally, a few words. As ordinary investors, we don’t need to do much:

1) Take a snack and don’t lose your mobile phone. After all, you have lost the right mobile phone. There are risks in the Bitcoin wallet;

2) Don’t delete the wallet application on the device. Unless you decide not to use this wallet anymore, it will be very troublesome later;

3) Set a complex password (see point 1 for the reason) and remember it carefully. This is what you will keep if the private key is lost.

For those of you who can’t remember your password and are too lazy to back up your private key scientifically, let’s just keep the money in the bank.

⑶ Own the private key and own the whole world

I believe that everyone who paid attention to the blockchain this morning has seen this article by Brother Jinma. This is not a story, but a time Real facts [about EOS mapping issues].

So, I did a test in my circle of friends, as follows:

Let me ask you a question: What is the most important among blockchain assets?

1. Password

2. Wallet address

3. PIN code

4. Private key
>
The results of the test surprised me.

There are people who choose one, two, three, and four. The most important thing is that there are many friends who have invested in the blockchain for more than two or three months, and 90% of them choose one. many.

What a dangerous signal this is.

Yes, the correct answer is choice four.

The private key plays the biggest role. Since it is decentralized and managed in a distributed manner, no one can transfer your assets except yourself for the private key you own.

What does it do?

When you forget your login password, its value is fully reflected. When you accidentally uninstall the corresponding wallet app, it can also save you from misfortune. When you change your phone or lose it, it is still there. Helping you find your precious assets.

Where did it come from?

When we register the wallet app, we will be reminded to back up the private key. Either it is a bunch of numbers, or some letters, or some words. Regardless of the order or case, it is absolutely not allowed. Change. very important.

How to keep it?

It is not recommended to use any software to take screenshots. Whether it is saved in QQ, WeChat, various cloud storages, laptops, or computers, it is not safe because the centralized management method is always managed by People are responsible for management, and due to the huge assets, accidents are inevitable.

Therefore, I suggest writing it down on three pieces of paper by hand, and then keeping them in three places you think are the safest and safest, such as a bank counter. Wait

Therefore, my opinion is that if you want to enter the explosive world of blockchain, you must first understand what a wallet is, how to register, and how to save private keys, rather than following the trend. Random investment projects.

Only if you are responsible for yourself, wealth will be responsible for you at the critical moment. Don’t be lazy. This is just the most basic starting point. Only if your foundation is stable can you go further.

Therefore, when you hand over your private key to others, it is equivalent to transferring your assets to others.

Remember: No matter what the reason or method, do not give your private key to others, it is everything to you!

Everything has just begun, I’m super looking forward to 2018!

⑷ Explain blockchain in vernacular

img src=' https://p26 . toutiaoimg.com/large/39b 70000088 e 51 B3 c 258 ' /

Recently, various ICO financial scams have been blocked in China, but this does not hinder the vigorous development of blockchain technology. After all, technology is innocent and can bring benefits to people. As for how to use it, it depends on people to operate it. If the operation is good, you can recommend development. If the operation is not good, just like major ICs.Same as Project O. Find some knowledge for Internet celebrities to conduct so-called illegal fund-raising and financial fraud.

After talking for a long time, what is blockchain? When it comes to blockchain, the first thing that comes to mind for many people is Bitcoin. We need to solve a problem. Bitcoin is a blockchain, but blockchain is not Bitcoin. Simply put, blockchain is distributed ledger technology (DLT), not a token. It has many characteristics, such as decentralization, traceability, and difficulty in tampering.

(1) Blockchain is a distributed database

First of all, this is a decentralized distributed architecture system. Therefore, having only one central server or node is not called a blockchain. For example, if you go to Taobao to buy a mobile phone, you and the seller are strangers and have no basis for trust. If you give the money to the seller first, the seller may block you by not delivering the goods, and then your mobile phone money will be gone. If the seller ships first, do you pay? It is possible that you do not pay the seller after receiving the goods, and one party may lose money anyway. At this time, a third-party guarantee is needed to solve the trust problem. Just like Alipay now, you give money to Alipay and the seller will deliver the goods. When you receive the goods, the seller will receive the money.

The above example is a centralized system because all guarantee work is handled by Bora, a third-party payment company. Suppose one day Alipay wants to tamper with data, neither buyers nor sellers can do anything because all authority is in the hands of one company.

At this time, a distributed database is needed. This third party is no longer Alipay, but thousands of monitors. When you buy a mobile phone on Taobao, you will shout to everyone that I am going to XXX to buy a mobile phone, and I paid XXX yuan. The other person will yell like everyone else. I collected XXX’s mobile phone bill and sent it over. In this way, everyone knows about this transaction and everyone is recording this transaction, so it is useless if one or two nodes have problems or malicious behavior, because most nodes have recorded this matter.

(B) Blockchain uses encryption technology to ensure data security

There are two important points here: 1. Crypto-enabled hash function 2. Asymmetric encryption.

If you are interested in specific concepts, you can go online, but people without basic knowledge may not be able to understand it, because these two points are too professional. In fact, if you only know the use of blockchain, you don’t need to have an in-depth understanding of it. It is also a technical concept. All you need to know is that blockchain relies on these technical points to ensure data security and is not easily tampered with. Of course, many people say that these two points can guarantee 100% non-tampering. I want to be a little conservative here. As an author who works in the security industry, I have always been skeptical about 100% security, so it may be more appropriate to call it difficult to be tampered with.

I will briefly introduce these two concepts and try to explain them clearly in plain English.

1. Cryptographic Hash Function

This is mainly used to verify the integrity of information. For example, I sent a message to the company leader saying that I was sick on Friday and needed to take a day off. At this time, a hash value will be generated based on the message I sent, such as: 123456. At this point, when the leader receives this message, a hash value is also generated. Because the content of the message I sent has not changed (it has not been tampered with), the hash value remains unchanged, still: 123456. This is if someone wants to tamper with this news and get sick on Friday and need to take a year off. At this time, the hash value will change, such as: 123489. That's when we learned our information had been tampered with.

2. Asymmetric encryption

It is mainly used for information encryption and authentication. It is actually two keys, one is called the public key and the other is called the private key. Public key encryption, private key decryption.

A public key is a key that everyone has. You own it, I own it. We can all encrypt with this key, but when decrypting it must be decrypted with my private key. If you don't have my private key, you can't decrypt it.

(C) The blockchain uses a consensus algorithm to reach consensus on new data.

The role of the consensus algorithm is to enable all nodes to reach a consensus on the new block. In other words, everyone must approve the new block.

For a centralized deployment system, this is simple, everything is controlled by the center, but in the distributed system of the blockchain, it is very complicated. For example, there are three nodes. A said he bought a mobile phone from XXX store and paid for it, B said he didn’t pay, and C said he didn’t pay enough. Then who do you listen to? What's more, blockchain technology is not as simple as three nodes, but a huge distributed system.

This is when a solution is needed. There is a corresponding problem in computer science called the "Byzantine Universal Problem" or "Byzantine Fault Tolerance" (BFT). This question was raised not because of Bitcoin, but because of a special background.

Early aircraft had three independent control systems. Why do we need three independent control systems? For example, in an emergency, there is a plane opposite. How to judge whether you should hide? If there is only one system, there is no choice, which is equivalent to centralized deployment. If the system breaks, you're dead. What if one of the two systems breaks? The good ones are said to hide, and the bad ones are said not to hide. The computer cannot judge the final result. Therefore, three independent systems are needed to support it, and the probability of two total failures is still very small. But this only takes into account injuries. What should I do if there is a malicious system? Is three enough? The answer is no, we need four systems to maintain consensus.

The use of blockchain is similar, because it is supported by a huge number of nodes, and each node is an independent system without interfering with each other. We can assume that the number of failed nodes and malicious nodes is limited, so it will not cause abnormal consistency of data.

Related questions and answers: What is blockchain? What is the use?

Blockchain is a new computing paradigm and distributed infrastructure that uses fast chain data structures, distributed node consensus algorithms, cryptography and smart contracts based on automated script code to produce, verify, store and transmit data. It can also be said that blockchain is a distributed ledger technology that can provide a decentralized trust mechanism in a non-trust environment, allowing multi-party participants to conduct secure and trust-based transactions without intermediaries.

The core advantage of blockchain technology is toCentralization can realize point-to-point transactions, coordination and collaboration based on decentralized credit in a distributed system where nodes do not need to trust each other by using data encryption, timestamps, distributed consensus and economic incentives, thereby solving the problem of centralization. It provides a solution to the problems of high cost, inefficiency and insecure data storage prevalent in institutions.

The fields of use of blockchain include digital currency, certificates, finance, anti-counterfeiting and traceability, privacy protection, supply chain, entertainment, etc. With the popularity of blockchain and Bitcoin, many related top domain names have been registered. It has had a relatively large impact on the domain name industry.

Related Q&A: Can you explain to me what a blockchain is in an easy-to-understand way?

Er Gazi is my friend since we were young, and we were naked in Hegou together. Later, I came to the city to study and work, and lived a life as a drifter in the north; he farmed at home and also did some small business, and now he has a son and a daughter, and his life is safe. He envied my so-called "seen the world", and I envied his simple life without the pressure of mortgage loans. We have completely different and mutually enviable lives??

That day, Ga Zi came to me on WeChat and asked "District" What is a blockchain?" I was stunned for a moment, how could this idiot care about such an avant-garde word? I pretended to be calm and prepared to talk about the technical principles bit by bit, but I could see the confused expression of that idiot through the screen of my mobile phone. How to explain "what is blockchain" to people who have a little bit of Internet concepts and technical foundation? This seems to be a very thorny problem??

The village commissary interprets the core of blockchain (picture quoted from the Internet)

The core essence of blockchain is "decentralization", and almost all operating modes of blockchain operate around the concept of "decentralization". Once you understand what "decentralization" is, you can basically explain the question "what is a blockchain?" For Erga, of course, he must perform a version that he can understand.

“I said, Gazi, are you still open that canteen at the east end of the village?” Gazi answered yes. I decided to use this canteen as an example to explain the actual use of blockchain in modern business and financial models. Scenario, so that he can better understand what blockchain is.

"Are there still many villagers who take credit now? By the end of the year, some of the accounts cannot be remembered clearly, and there are still many defaulters or those who refuse to accept their accounts?" At this point, Ergazi got emotional and kept complaining. Nowadays, people's hearts are not as old as before, and business is difficult to do!

"In the past, the operation model of your canteen was a typical centralized one. You granted credit to the villagers and allowed them to take accounts on credit. All accounting was done directly through you and our villagers. You were the center of all accounting affairs." Ergazi said I understand, let me continue.

I said: "If you fail one day, then all the accounts will become dead debts? It will be difficult to get back the IOUs written in black and white, let alone those who remember the accounts verbally, but the block The decentralization of the chain can solve this problem very well. As long as the earth still exists, the blockchain will remember that every account will exist forever." Erga became more energetic after hearing this.

The essence of blockchain is "decentralization""

"The essence of blockchain is decentralization. Once someone takes credit from you, all the neighbors in the village will help you keep accounts. Because there are many nodes for accounting, it is neither easy to make mistakes nor others can refuse to pay, so everyone reaches a consensus. If someone maliciously fails to repay the debt, the whole village will know his character, and no one will be willing to have financial dealings with him in the future??"

At this point, Gazi was obviously a little excited. It seemed that he was I was really worried about the credit issue. Seeing that Gazi was interested, I also felt a small sense of accomplishment and continued: "Of course, the above is just an analogy. In fact, the blockchain does not really allow villagers to get paper. The pen helps you keep accounts, but it is done through the Internet and computer networking. "

At this time, Gazi was a little confused and asked: "Then what others bought from me, wouldn't everyone in the village know it? Then who would buy things from me? There is really no privacy at all. And you don’t have time to keep accounts here. Last year’s accounts are said to be this year’s. What if you keep procrastinating? "

"Okay, Gazi, your question is on point. "It seems that Gazi is not stupid at all, and he is very shrewd in doing business. I continued to explain: "So, the recording and transmission of this information are all done through encryption. What you see is a picture of numbers and English. String, and each account has a timestamp to record the time of occurrence, which cannot be relied on. "

Gazi had another question: "Is it possible that the people who owe the debt have a good relationship with the villagers, and they join forces to tamper with the accounting? Then you won’t be able to explain clearly at that time??”

“Gazi, that’s all you have, haha. "I understood Gazi's concerns and continued to explain: "The mechanism of the blockchain requires more than 51% of people to agree to tamper with a bill. Everyone has a degree of closeness and distance between them, and it is impossible for everyone to favor the same person. If it were a computer, more than half of the computers on the entire network would need to recalculate. This project would be so huge that it would be almost impossible to complete."

In this way, through the actual situation of the canteen and combined with some scenes in life, Gazi understood What is in the blockchain: decentralization, distributed accounting, consensus mechanism, encryption mechanism, timestamp, and the characteristics of being difficult to tamper with.

Ergazi was silent for a moment, seeming to be digesting the example I just gave him. I don’t know how much he can understand the example. Not long after, he sent me a voice message on WeChat: “What does blockchain mean? In the past, when I bought goods online and paid, I had to go through Jack Ma’s house. If there is a blockchain, can we directly trade with the seller? Anyway, the accounting is very safe. "

"Okay, Gazi, it's really clear at first glance. Blockchain is essentially a decentralized distributed ledger data cloud. Of course, it can be understood according to your understanding. "I'm very happy that Ga Zi can roughly appreciate the true charm of the blockchain. Fortunately, my words have not been in vain.

What is Bitcoin? (Picture quoted from the Internet)

"Then Bitcoin What is this thing again? What does it have to do with blockchain? "Gazi asked.

I thought about it briefly and decided to continue to use the canteenLet me explain to Gazi with the story: "In your canteen, the villagers can't keep accounts for you for free all day long. Do you have to bring something to visit during the holidays? This is the reward mechanism of the blockchain. Everyone who participates Anyone who keeps accounts may get rewards."

"Then what are the rewards based on? There must be a rule, right?" Gazi asked very puzzled.

I explained: "Zhang San went to your store to buy a pack of cigarettes on credit, but Li Si knew about it first and kept an account for you. Then other people knew about it and started keeping accounts. Then Li Si could get A small red flower as a reward ~ This little red flower is generated by the blockchain system and has no value in itself, so you do not need to pay any cost for this little red flower??"

"Then Bitcoin can be used as money Flowers? How is it different from the banknotes we usually spend?" Gazi continued to ask.

"Bitcoin is a digital encrypted virtual currency. In principle, it has no value itself like our banknotes. However, banknotes have the country as a credit guarantee, so they have value. Bitcoin is the Bitcoin network The value formed by consensus among users has tradable attributes, so it can be used to carry value." What is said here is a bit profound, I don't know if Gazi can understand it.

I continued to explain: "Banknotes can be printed infinitely. If you print too much, inflation will occur. When we were young, popsicles costing 1 cent were very good. Now we cannot eat them for 1 yuan. Of course, there are factors that affect inflation. A lot. The number of Bitcoins is fixed, and there is no possibility of unlimited over-issuance. However, different people have different judgments on their value, coupled with the influence of supply and demand and investor sentiment, so its price is always fluctuating. ."

What is the difference between Bitcoin price fluctuations and stocks?

"So speculation in Bitcoin is speculation in stocks? Can you understand it that way?" Ga Zi seems to know a lot.

"Actually, there are some similarities, but there are also big differences." I continued Gazi's topic: "The price of stocks always fluctuates around the valuation of the company, and there is government supervision in the stock market. And Bitcoin It itself has no value, and is priced entirely based on supply and demand and player valuations. It grows wildly without any government supervision, so it may have higher risks and higher returns than stocks."

In the end. , Gazi revealed the true purpose of today. He asked me: "Can I invest in blockchain projects?"

Gazi is a typical example of not going to the Three Treasures Palace for anything. Despite a large circle, both blockchain and Bitcoin, in fact, the question he really cares about is "Is investment in blockchain projects reliable?" When these words came out, I was extremely shocked. Now The so-called blockchain investment projects have actually reached fourth- and sixth-tier cities and small towns!

Up to now, there are only three situations in investing in blockchain: mining, currency speculation, and so-called blockchain projects.

Mining and currency speculation are still the main lines of the blockchain (pictures quoted from the Internet)

The so-called mining is to obtain returns by purchasing mining equipment such as mining machines, mining virtual currencies, and then selling them for cash. . youYou can install the mining machine yourself, or you can find a mining pool to host it, but the core keys to profitability are "computing power" and "power consumption" as well as investment in equipment. With the sharp drop in the price of virtual currencies and the increase in mining difficulty, the current mining returns of many currencies are very unsatisfactory. Mining is obviously something only a very small number of investors who understand technology can do well, and my childhood friend Gazi obviously can’t do it.

As for "coin speculation", I have just introduced some differences between Bitcoin and stocks in the previous section. In principle, although they are both "buy low and sell high" operations, they are very different. Ordinary investors cannot determine the value of a virtual currency itself. The price is determined entirely by the relationship between supply and demand, which is somewhat similar to what we often call "market makers." On the other hand, the virtual currency trading market is extremely unstandardized, and fraud and hacker attacks often occur. The risk factor is much greater than investing in stocks. For the safety of my friends' funds, I am one of the ten thousand people who disagree with me and come to "speculate in coins"!

The "September Fourth Movement" stipulated that the issuance of virtual currency is illegal

In fact, in my opinion, most of the so-called investment projects in the market are essentially "illegal fund-raising" and "pyramid schemes." Some so-called blockchain investment projects attract investors into the circle through various packaging and inflammatory rhetoric, and then create the illusion of profitability by building a software and hardware ecosystem of issuing new coins + mining + currency speculation, and then finally run away. Our country's laws clearly stipulate that the issuance of virtual currencies is illegal.

Illegal pyramid schemes now wear the cloak of blockchain (picture quoted from the Internet)

And how to identify some pyramid schemes under the guise of blockchain? In fact, these pyramid schemes are also so-called Ponzi schemes, what we people often call "empty gloves." These so-called "direct sales" or "marketing" activities often have no actual products to circulate, and rely more on developing "downline" to ensure top-level profits. With the rise of the concept of blockchain, this MLM model has shown an intensification trend, and it even deceives people under the banner of state support for new technologies.

When Gazi asked, “Can blockchain projects be invested in?”, I realized the seriousness of the problem. Gazi is a typical young man from a small town, and his pursuit is his wife and children. But when faced with the attraction of "wealth", people often do inappropriate things. Mining and currency speculation are simply not suitable for him, let alone blockchain investment projects that are most likely "illegal financing" or "illegal pyramid schemes"!

I quickly dialed Gazi’s phone number and carefully conducted the above analysis??

⑸ The problem of blockchain wallet mnemonic words and private keys

Indeed, There are currently blockchain wallets using this technology, such as IDC
Wallet. In fact, the mnemonic phrase is another form of private key and has the same function as the private key. It is mainly used to protect your blockchain money

⑹ Private key and public key in the blockchain< /p>

Public key (public key, referred to as public key), private key (private key, referred to asPrivate key) is the content of asymmetric encryption algorithms in cryptography. As the name suggests, the public key can be made public, while the private key must be kept securely.

The private key is generated by a random seed, and the public key is derived from the private key through an algorithm. Because the public key is too long, for simplicity and practicality, an "address" appears, and the address is derived from the public key. These derivation processes are one-way and irreversible. That is, the address cannot derive the public key, and the public key cannot derive the private key.

From this we can see that the public key and the private key exist in pairs. Their usefulness can be summarized in 16 words: public key encryption, private key decryption; private key signature, public key signature verification.

Public key encryption, private key decryption. That is, the original data is encrypted with the public key, and only the corresponding private key can decrypt the original data. This prevents the original data from being stolen during transmission on the network and protects privacy.

Private key signature, public key signature verification. Use the private key to sign the original data, and only the corresponding public key can verify that the signature string matches the original data.

Locks and keys can be used as metaphors for public keys and private keys. The lock is used to lock an item, and the key is used to unlock the item. The key owner is the owner of the item. In fact, this is the case. The public and private key pairs establish the ownership of the blockchain's account system and assets (Token, etc.). The blockchain assets are locked on the public key, and the private key is used to unlock the asset and then use it. For example, if I want to transfer assets to you, I use my private key to sign a transaction in which I transfer assets to you (including assets, quantity, etc.) and submit it to the blockchain network. The node will verify the signature and it is correct. Then the assets are unlocked from my public key and locked to your public key.

We have seen the role of the private key. It is as important as the password of the centralized accounting system (Alipay, WeChat Pay, etc.). Having the private key means ownership of the asset, so we must keep it. A good private key cannot be leaked.

⑺ [Blockchain] Bitcoin private key, public key, signature

When understanding the basic noun concepts of blockchain, it is mentioned that addresses are composed of characters and numbers, but there is no explanation. How it came about. The bank card number is generated by the bank's core system, so how is the Bitcoin address generated? Look at the picture below:

For those who are new to Bitcoin, they will be confused when they see this picture. What are private keys and public keys? Why is it so troublesome to generate an address?

Now please remember this sentence: The private key generates the public key through elliptic curve multiplication, and the private key cannot be derived using the public key; the public key generates the Bitcoin address through the hash function, and the address cannot be derived Export the public key.

The address is calculated through such a complex algorithm. Are the private key and public key just for generating the address? No, they have other uses. Let’s first understand the private key and public key.

Now that we have explained the concepts of addresses, mining, proof of work, computing power, blocks, blockchain, etc., do you still have any impressions? If you forget, please review these concepts because they will be used in many places later. Tomorrow I will explain the characteristics of blockchain.

Reference books: "Mastering Bitcoin"
Blockchain knowledge topics:

Bitcoin accounting method (Blockchain knowledge 2)
Understanding blocks The basic noun concept of chain (blockchain knowledge 1)

⑻ What does the private key in the blockchain mean?

The term private key and public key can be said to be the simplest of all exam questions Yes.
The public key is called the public key, and the key that only you know is called the private key.
Public Key and Private Key are a key pair (i.e. a public key and a private key) obtained through an algorithm. The public key is the public part of the key pair. The private key is the non-public part.
Clear in one sentence~