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㈠Why are people being asked about blockchain?

Listed companies have started to make articles around "blockchain". In January this year alone, 16 listed companies on the Shanghai and Shenzhen stock exchanges were questioned by exchanges for speculating on blockchain concepts. Since then, although the popularity of the blockchain concept has declined, regulatory authorities have not relaxed. Basically every month, news comes out that several companies have been questioned about blockchain.

Securities Daily's exclusive statistics found that as of the date of publication, 34 listed companies have been questioned by regulatory authorities this year due to "chain involvement."

3/4 companies involved in the chain have no practical applications. At the beginning of this year, a series of abnormal stock price fluctuations of listed companies attracted the attention of the exchange. These companies have one thing in common. They are all suspected of hyping the concept of blockchain to drive up their stock prices. At that time, the saying "the one who sticks to the blockchain will become popular" became popular.

In this regard, Yu Rui analyzed that, on the one hand, blockchain is an innovative business, and listed companies have high requirements for returns from innovative businesses, which can have a substantial impact on near- and long-term performance. They are in a position to control risks. For control reasons, we prefer to invest in areas with clear prospects, thus limiting the areas of implementation;

On the other hand, we are currently in the early stages of large-scale productization and have few practical applications. It is also an inevitable process for the development of the entire industry. “I believe that in the next two years, more substantial results will appear,” he said.

㈡ Questions about how to communicate with customers in blockchain mining

Make sure the customer is our prospective customer, or a customer who is interested in our products. Make sure the content we provide to our customers is of interest to them. If you want to get a reply from your customers, you must provide them with accurate data for their reference, so as to know the market situation and market demand of the product in their country. The more detailed you write, the better, so that you can attract the attention of customers. , the chance of getting a customer response is also greater.

㈢ What issues do you need to know about blockchain technology security?

I believe everyone should be familiar with blockchain technology, and today we will take a look at it together. In the field of blockchain technology security What are the issues that require our attention? Let’s start with today’s main content.

Currently, most blockchain projects carried out within enterprises are so-called "private chains with permissions". Unlike public blockchains, private blockchains can only be accessed by a selected group of users who have the authority to enter, verify, record, and exchange data on the ledger.

Of course, for an "outsider" who has never been allowed to join, such a network is almost impossible to break. But with the emergence of private chains, another question arises: In order to improve privacy and security, do we really need to abandon decentralization?

Mike Orcutt from "MIT Technology Review" wrote that a private blockchain system “might make its owners feel more secure, but it actuallyThey are simply given more control, meaning they can make changes regardless of whether other network participants agree or not. "Such systems need to come up with balancing mechanisms, grant different levels of permissions to different user groups, and perform identity checks on validators to ensure they are who they claim to be.

This is why many companies are Look for a way to have the best of both worlds - the decentralization of a public chain and the extra security of a private chain. Consortium chains, developed by major players such as IBM, Corda, Ripple and others, appear to be good security options at the moment. In short , they provide enterprises with access to centralized systems, and the systems themselves have a certain degree of cryptographic auditability and security.

Other enterprises are also considering how to adjust public chains to meet their security concerns. Full requirements. For example, the Ethereum blockchain already provides mechanisms that can be used to ensure the privacy of network participants, including ring signatures, stealth addresses, and storing private data on the public chain.

General Generally speaking, the blockchain field is developing steadily towards new solutions that define technology-granular privacy layers for public chains, private chains, and consortium chain networks. IT training found that companies are actively investigating and patching known vulnerabilities, and adopting new Mechanism to ensure that all parties are protected, and no malicious hackers can break into and exploit the loopholes in the ledger.

㈣ Blockchain 100 Question: Blockchain Records What information

The blockchain is the big ledger of the Bitcoin network, and each block is equivalent to a page in the ledger. So what is recorded in the "ledger

What about information? Currently, each block of Bitcoin mainly records data such as block header, transaction details

, transaction counter, and block size.

"Block header" It contains all information except transaction information, mainly including the hash value of the previous block header:

Used to ensure that blocks are concatenated in order; timestamp: records the generation time of the block; Random number: the answer to the arithmetic problem of the entire network of mines

; difficulty target: the difficulty score of the arithmetic problem.

"Transaction details" record each transaction in detail The transferor, incomer, amount and digital signature of the transferor

of a transaction are the main contents in each block.

"Transaction Counter" Describes the number of transactions included in each block.

"Block size" indicates the size of each block data. Currently, each block is limited to 1MB, and does not exclude

There is the possibility of expansion in the future.

㈤ 100 Questions on Blockchain (Episodes 1-10)

1. From barter to Bitcoin | Blockchain 100 Ask Episode 1

2. What is Bitcoin? 100 Questions on Blockchain Episode 2

3. The Birth of the Bitcoin White Paper 100 Questions on Blockchain Episode 3

4. The Birth of the First Bitcoin Blockchain 100 Questions Episode 4

5. Who is Satoshi Nakamoto? Blockchain 100 Questions Episode 5

6. What are cypherpunks? Blockchain 100 Questions Episode 6

7. How is Bitcoin issued? Blockchain 100 Questions Episode 7

8. Blockchain 100 Questions Episode 8: What kind of pizza actually sold for 300 million yuan?

9. Blockchain 100 Questions Episode 9: Satoshi Nakamoto’s successor Gavin Andreessen

10. Blockchain 100 Questions Episode 10 ：Bitcoin Faucet

11. Blockchain 100 Questions Episode 11: Why hasn’t Bitcoin been mined yet?

12. Blockchain 100 Questions Episode 12: How does Bitcoin achieve a constant total supply?

㈥ Issues with Blockchain

Blockchain has certain uses, but it is by no means omnipotent.

There are two main problems with blockchain.

1 The blockchain cannot verify the authenticity of information outside the system. If the information uploaded to the blockchain itself is false, the anti-counterfeiting and anti-tampering of the blockchain will be worthless. To ensure that the uploaded information is authentic, there still needs to be an authoritative agency to check it. Since we all trust the information uploaded by this authoritative organization, why should we be afraid of it tampering with the information? What difference does it make if we use blockchain or not?

2 In the blockchain world, code is the law, and the system can run automatically. However, once it interacts with the real world, the real world may not necessarily agree with the law of the code. For example, if a contract is signed on the blockchain, it will be automatically executed when it expires, and assets will be transferred. However, if there is a bad guy in reality who does not execute the actual asset transfer in accordance with the contract on the blockchain, the contract will be a piece of paper. It is also necessary for the actual courts and other institutions to take action.

The first practical application of blockchain, Bitcoin, has such great influence because it can avoid the above two problems.

Bitcoin is completely self-contained. All information is generated within the Bitcoin system and is closed and verifiable. Bitcoin is not linked to any real assets, so it can be easily passed through The program runs automatically.

Because Bitcoin is completely virtual and operates entirely on procedures and rules, it has no borders, is not subject to regulatory control, does not require exchange, circulates freely, cannot be frozen or confiscated, is available to everyone, and will not be over-issued or devalued. , which is its advantage over legal currency.

However, precisely because of bitThe currency completely relies on fixed rules and procedures to operate automatically. The supply of Bitcoin is inelastic. If the private key is stolen, the property will be lost and cannot be recovered. This is also its shortcoming.

Similarly, when using blockchain technology in reality, if we really pursue that code is the law and the private key proves everything, if the private key is stolen, the assets will inevitably be lost and cannot be recovered. For example, if shares are mapped to the blockchain, is it possible that if a major shareholder loses his private key, all his shares will become unusable? This is also an unavoidable problem with blockchain.

In summary, the real killer application of blockchain is actually cryptocurrency. Developing a currency-less blockchain is not that disruptive, and we must be wary of some scammers using the banner of blockchain to defraud money and subsidies.

#digital currency# #BTC[超话]#

㈦ You will understand what is blockchain if you understand these 9 questions

What is blockchain? You can understand by understanding these 9 questions
What is blockchain? What can blockchain do? How to make money with blockchain? I believe that many netizens are confused when faced with this new term. So how can we better understand blockchain and make this new technology available to us? The author has collected nine very common questions from the Internet. I hope that after reading this article, you will have a clearer understanding of blockchain.

Nearly omnipotent blockchain technology
Simply put, blockchain is a new application model of computer technologies such as distributed data storage, point-to-point transmission, consensus mechanism, and encryption algorithms. Its core is distributed data, and the result is "decentralization." Blockchain technology can be applied to many scenarios in our lives. Next, let’s take a look at the analysis of blockchain technology!
1. Technology is a double-edged sword. While you are still using your mobile phone to play games, others are already using their mobile phones to make money every month! I want to try Jiaerwu Wuyi Wuba Lingyi Lacquer to make your mobile phone no longer a toy!
Just like nuclear energy is a physical technology, blockchain is an underlying technology at a technical level.
Nuclear energy can be used for atomic bombs and nuclear power generation. Similarly, blockchain can be used for the management of industries and life elements, which may make society more stable, or it may be used by bad guys as the fastest way to commit crimes. .
2. Talking about technical value apart from the application level is muddying the waters
As the underlying technology, blockchain has its application level and negotiation methods. Currently, some people talk about blockchain in terms of business models, some in terms of hardware, and some people talk about blockchain in terms of power distribution. It is gradually becoming clear in the market that blockchain is used in the design of technology combinations and business models, from hardware to software to business model to financial design and many other aspects. But not every blockchain can issue coins, and not every blockchain should issue coins.
3. Technology goesCentralization, application may not be possible
Blockchain technology is decentralized, but upper-layer applications can be decentralized or not. If it is applied to things, industries and projects that cannot be decentralized, it is not decentralized; if it is used to things where everyone can participate universally and have equal authority, then it can be decentralized.
Including coins on the blockchain, if a country adopts legal digital currency, the coins on the blockchain can also be centralized. The blockchain that supports the operation of Bitcoin is decentralized, but the alliance chain usually has one or more enterprises as the core control alliance, which becomes centralization.
Technology itself and what kind of business and political ecology the technology can support are completely different things.
4. What kind of people use what kind of tools
As a powerful tool, blockchain is powerful not only because of technology, but also because many talented people have invested in it. field, causing the energy of this technology to be amplified. As for whether the power of blockchain benefits society or cuts leeks? It is possible to make the world more turbulent or to make society more harmonious and beautiful.
On the positive side, more kind-hearted people will come in and reach more consensus, and there will be more legislation, restrictions and norms at the national level, which will ultimately allow us to use this technology to give more people opportunities; on the negative side, In other words, it is possible that more greedy and unethical people will come in to divide the wealth, and it is even possible that people in some countries and regions will use this new technology to commit crimes and terrorism.
5. Blockchain promotes the globalization of civilians
Under the blockchain, the global connection space is closer. The 6-degree space will become 5 degrees or even 4 degrees in the future. Blockchain can inspire The growth of various communities. The globalization of interest groups will become inevitable, and there will be various international communities and summits in the future.
6. Blockchain facilitates co-creation
For example, in the past, the connection between international singers and ordinary people had to go through several barriers, including record companies, agents, sales channels, etc. In the blockchain era, international singers publish their songs under blockchain technology. Everyone has the possibility to become a partner of an international singer, write songs for the international singer, or purchase Tokens to obtain dividend rights from distribution proceeds, etc., and enjoy records. Proceeds from distribution and downloads.
7. Trust will become convenient and low-cost
The combined effect of artificial intelligence, big data and blockchain can resolve disputes at the factual level. The tamper-proof nature of the blockchain allows hundreds or even tens of thousands of machines to maintain the same data and encrypt it. Basic facts will be trustworthy. On this basis, the corresponding contracted and authorized information cannot be changed. Replace manual systems with machines, breaking the loopholes in manual operations, the possibility of cheating and even corruption, so that everyone's information can be confirmed to be authentic and trustworthy.
On this basis, if the trust level of the business system is good, trust between people will be enhanced in the process of implementing the designed system.
8. Interaction leads to creativity, and creativity generates income
Blockchain is a comprehensive ledger. Some exchanges are just ideas and creativity at the moment, but they may be the starting point of a certain career or even industry in the future. In the previous accounting system, there may not be value. However, under blockchain technology, values ​​that are not yet seen can be recorded. If this leads to products, creative people can benefit. Various human activities may be valuable, creative, and worthy of recording.
Extended from this, a better application of blockchain can record creative related models, introduction of business opportunities, etc., and put valuable things in an ecosystem. Blockchain can create new ones. A cooperative approach.
9. There will be more legal supporting facilities in the future
The world of blockchain is not a disorderly world. Technology will be used by people, and people are rational.
Records can resolve various factual disputes, and can also cause more issues such as authorization rights, patent and creative copyright management, and many other issues. In the future, there will be more legal support, which can not only standardize and manage service consumption and life, but also avoid related risks and problems, avoid and combat crime

㈧ Blockchain issues: In the Ethereum chain and Binance Chain and Huobi Chain, coins with the same contract address on the three chains, do they have high technical content?

With the continuous promotion of blockchain technology, many people feel that digital currency is the blockchain, and the area Blockchain is digital currency.
Actually, many of the digital currencies, digital currency exchanges, and digital currency mining machines that are packaged as high-end products are just various previous fund plans, pig-killing plans, and deceptions, put on a new coat.
(1) Digital currencies recognized around the world
There are only a few digital currencies recognized around the world.
For example, the most well-known is Bitcoin, which is called Bitcoin in English. It is the most representative example of digital currency. Currently, many transfer transactions are conducted using Bitcoin.
The other one is Ethereum, or ETH in English. A large number of existing digital currency applications are basically based on ETH.
So, in the field of digital currency, it can be said that there are only two that are recognized as valuable.
On September 30, 2017, all digital asset trading platforms in China have completely stopped all trading operations. Therefore, now you can only purchase digital currencies through a series of special means from exchanges set up on foreign servers, and this is also a gray area.
At the same time, the most fatal thing is that even Bitcoin, the leader of digital currencies, is extremely unstable.
For example, on May 10, 2020, the unit price of Bitcoin instantly dropped by thousands of dollars from US$9,500 in half an hour. The lowest price fell below US$8,200, and the highest price difference exceeded US$1,400, which is nearly 10,000 yuan.
This drop is extremely unbearable for ordinary people who were protected by the 10% drop in A-shares.
It can be seen that,Even for Bitcoin and Ethereum, before investing, you must carefully study it and consider whether you have the ability to afford it before investing.
(2) Some altcoins that imitate Bitcoin and Ethereum
We have said that in the field of digital currency, the only two that have investment value are Bitcoin and Ethereum. why?
This is because the Bitcoin and Ethereum algorithms are completely open source. Anyone can download the source code, modify some parameters, and recompile to create a new p2p currency. However, these counterfeit currencies are fragile and extremely susceptible to 51% attacks. Any individual or organization, as long as it controls 51% of the computing power of a p2p currency network, can manipulate transactions and currency values ​​at will, which will cause a devastating blow to the p2p currency. Many altcoins fail at this point. The Bitcoin network is already robust enough. If you want to control 51% of the computing power of the Bitcoin network, the number of CPU/GPU required will be an astronomical number.
This is also the reason why Bitcoin and Ethereum are still strong today and are still used around the world. But many altcoins just flashed by like shooting stars.
The more famous altcoins, including EOS, LTC, etc., were all eagerly awaited by the world before they were listed. After they were listed, they were reverted to prototypes due to their imperfect functions.
So, those who bought these altcoins at that time suffered greatly. Don’t forget, we also mentioned above that large fluctuations in digital currencies are extremely common and there are no limits on the rise or fall.
So, don’t touch altcoins.

㈨ What are the existing problems with blockchain technology

1. Performance issues

Volume issues

Blockchain’s impact on data Backup requirements pose storage space challenges. Blockchain requires that after a transaction is completed, it is broadcast to the entire network, and every node in the system must back up data.

Take Bitcoin as an example. The block data since the creation block has exceeded 60GB, and the amount of blockchain data is still increasing. This will bring problems to the operation of the Bitcoin Core client. A big challenge.

Processing speed issues

The Bitcoin blockchain currently processes a maximum of 6.67 transactions per second, and a confirmation time is about 10 minutes, which can easily cause congestion delays for a large number of transactions, which may Applications with small multiple transactions and highly time-sensitive transactions will be restricted.

Although there are some methods to overcome it, methods to comprehensively solve transaction efficiency still need to be discovered.

Energy consumption is too high

Thirdly, the computing power in the mining process does not produce additional actual social value, and also wastes a large amount of electronic resources. With the increasing popularity of currency, blockchain has gradually become a capital-intensive industry with high energy consumption.

2. Centralization problem

Inequality of nodes

First, in theory, each node in the distributed network should be treated equally, but in order to obtain rewards for mining, each node may increase its computing power to compete for hardware. This leads to node inequality and destroys the randomness of blockchain accounting rights.

Industrialized and large-scale mining has given rise to mining pools

Theoretically, if the mining pools collude to control more than 51% of the computing power for system supply, a dual Although the costs of payment far exceed the benefits in the actual process, the possibility of collusive supply cannot be denied.

3. Privacy and security issues

Private keys are easily stolen

First, the current blockchain uses an asymmetric key mechanism. It has high security, but the private key is stored locally and can be easily stolen by hackers.

The transparency of blockchain data can easily lead to privacy leaks

Every participant in the public chain can obtain a complete data backup, and the entire system is open and transparent. The currency protects privacy by isolating the connection between the transaction address and the holder’s true identity.

When the blockchain needs to carry more businesses, how nodes verify information and execute commands requires more consideration.

4. Upgrade and incentive issues

The number of participating nodes in the public chain is huge

Whether it is upgrading or fixing errors, the system cannot be shut down and centralized. , it may be necessary to consider relaxing the issue of decentralization.

There is a competitive game between each node

Requires the improvement of incentive compatibility mechanism, how to enable self-interested nodes in the decentralized system to spontaneously carry out block data verification And accounting work, and designing a reasonable penalty function to suppress irrational competition is another challenge faced by the blockchain.