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This article introduces the relevant knowledge of "what are the problems in the blockchain interview process". In the operation of the actual case, many people will encounter such a dilemma. Then let the editor lead you to learn how to deal with these situations. I hope you can read it carefully and be able to achieve something!

Blockchain job interview recruitment process may be problems, but face-to-face is certainly not enough, it can be regarded as a kind of interview questions.

1. Q: what do you think blockage in blockchain technology means?

The blockchain consists of information about all financial transactions. A block is just a list of records. When these lists are combined with each other, they are called blockchains. For example, an organization has 100 ledger books, in which a combination is called a block chain, and a single ledger will be treated as a block.

two。 Q: why blockchain is a reliable method

There are many reasons why blockchains can be trusted. The first reason is that it has good compatibility with other commercial applications because it is open source. The second is its security, because it is developed for online transactions, so developers pay special attention to its data synchronization while ensuring security. Because the type of business it owns is irrelevant, the distinction chain is easily considered when choosing.

3. Q: is it possible to remove one or more blocks from the network in the blockchain?

Of course, if only a specific part of the online ledger is considered. With default options and filters, this task can be easily accomplished without too much effort.

4. Q: how much do you know about blockchain?

This is a technology actually designed for Bitcoin and has been widely promoted for the benefits of monitoring and recording all financial transactions on the Internet. This is a trustworthy approach and is currently being used by many organizations. Because everything is very secure and it is an open source way, it can be easily trusted in the long run.

5. Q: how does the blockchain method identify blocks?

Each block in the online ledger basically contains a hash pointer that points to and forms a link to the block before it, which contains transaction data and a timestamp.

6. Q: what exactly do you think is the security of a block?

No user on the network can modify the block. So it provides an excellent level of security. In addition, each block is protected by encryption, which is another measure. Therefore, there is no need to worry about the security and security of the data that exists in the block.

7. Q: are there any network-specific conditions for using blockchain technology in an organization?

There are no specific conditions for using it. However, the network must be a peer-to-peer network under the relevant protocols. It actually simply validates the new block and helps organizations keep synchronized without investing in third-party applications.

8. Q: what is encryption? What is its role in the blockchain?

Data security is always important. Encryption is basically a way to help organizations keep their data secure. In this technique, the data is encoded or changed to some extent before it is sent to the network by the sender. The only receiver can understand how to decode it. This approach is useful in the blockchain because it increases the overall security and authenticity of the block and helps protect the security of the block.

9. Q: once the data block is written, can the data be modified?

No, it's impossible. If any changes are needed, the organization only needs to delete the information for all other blocks. This is because there is no other way, and the data must be very careful when using this method.

10. Q: what types of records can be saved in the blockchain? Are there any restrictions?

There are no restrictions on any type of record in the blockchain method. At present, this method is being used by many organizations around the world, and the fact is that medical transactions, organizational events, management activities, transaction processing, identity management, and document records are common types of records that can use blockchain. And record keeping is not limited to these applications.

11. Q: what is double expenditure?

This is one of the main problems related to digital currency. In fact, this is a condition for a digital pass to be used many times, because a pass usually consists of digital files that are easy to clone. It will only lead to inflation and organizations have to suffer huge losses. One of the main goals of blockchain technology is to eliminate this method as much as possible.

twelve。 Q: explain the importance of blind signatures and how they are useful?

It is actually a form of digital signature and an important part of cryptography in which all information is blind before it is actually considered or signed. This is a proven approach and is usually considered in privacy-related protocols where the author and the signatory are different. Digital currency design is one of the most common examples.

13. Q: what is key sharing? What are the benefits of blockchain technology?

It is a well-known fact that security issues in digital transactions are very important. Key sharing is a similar approach. In blockchain technology, this is a method of dividing keys or personal information into different units and sending them to users on the network. The original information can be used only if the participants who have assigned the key agree to combine them with others. It can provide a variety of security-related benefits in blockchain technology.

14. Q: what is a super ledger? Does blockchain support?

Super ledger is just a special kind of ledger, designed for enterprises that provide services to people. Without a strict service ceiling, enterprises can be managed through super ledgers. Blockchain has algorithms specifically designed to deal with super books. In fact, it reduces a lot of related problems.

15. Q: what are the steps involved in the implementation of the named block chain project?

This process involves a total of six steps, which are:

1. Demand identification

two。 Filter and confirm requirements

3. Block chain project development

4. Feasibility study on safety

5. Implement

6. Control and monitoring projects

16. Q: what are the benefits of blockchain that you know?

It encourages secure online transactions, which is one of its biggest benefits. Basically, as a distributed ledger that pays close attention to all transactions, it does not allow the records to be changed by anyone, which enhances security. In addition, participants and business owners can always ensure the final cost audit. One thing that a blockchain can always guarantee is that each block or unit can only be transmitted once, which eliminates the problem of double expenditure.

17. Q: name the two records that exist in the blockchain database?

These records are block records and transactions. Both records are easily accessible, and the best way is to integrate them with each other without having to follow complex algorithms.

18. Q: what information threats do you know?

At present, there are many threats to information. Due to the increase in online transactions on the Internet, many hackers have become active and are adopting new methods to crack data and servers containing financial information. The main threats are software attacks, identity theft, information blackmail and sabotage. In addition, Trojans, worms and viruses are also the makers of trouble.

19. Q: what challenges may information disclosure pose to the organization?

Information disclosure can greatly reduce the reputation of an organization. In addition, this may be the reason why the organization has suffered huge losses. Many organizations that fail to implement security protocols to ensure the security of their data have lost the trust of their customers and are trying to gain the same reputation again. If you do not focus on the security of online transactions, the overall profit of any organization can be reduced by 80%.

20. Q: are there any organizations that can use blockchain technology?

There is no strict upper limit on the types of business that can be considered in this way. In fact, almost all enterprises are conducting online or financial transactions, and these transactions require them to successfully carry out the complete process. Large companies, financial institutions, the private sector, government departments and even defense organizations can easily trust this technology.

21. Q: what is information processing? What are the key challenges related to this?

This information is usually shared on the Internet. Before it can actually be sent over the network, it needs to be changed to a format that suits the channel standard (the channel is the link between the sender and receiver). The work of information conversion between the sender and the receiver is usually regarded as information processing. The biggest challenge in information processing is to protect it during this time. Another challenge is that processing bulk information can limit performance.

twenty-two。 Q: what does BIP stand for?

This means suggestions for improvement of Bitcoin.

23. Q: what are the key principles in the blockchain that help eliminate security threats that need to be followed?

Yes, there are some principles to follow in terms of time. They are:

1. Audit

two。 Protect the application

3. Make sure testing and similar methods

4. Database security

5. Continuity plan

6. Digital labor force training

All of these principles are basic and easy to implement. They help to make transaction records useful.

24. Q: what is the basis of blockchain technology?

It enables information to be distributed among users without being copied.

25. Q: is blockchain an unbreakable ledger?

According to the developer, the blockchain ledger cannot be damaged.

twenty-six。 Q: what is a security policy?

The security policy defines exactly what needs to be ensured on the system. It binds network users according to some core protocols, all of which must be agreed and followed to improve overall security. When it comes to organizational information or financial records, more than one security policy is implemented.

twenty-seven。 Q: how will you handle risk management when ensuring transaction records?

It is basically a process of finding threats and all vulnerabilities in the organization's financial records. The best way to deal with this practice is to take the right countermeasures immediately. Another way is to pay attention to the backup plan. Depending on the value of the information, you can simply consider more methods such as buying new risk management software. The main risk of information comes from black hat hackers.

twenty-eight。 Q: please list the general types of ledgers that users can consider in the block chain?

These are:

1. Centralized ledger

two。 Decentralized ledger

3. Distributed ledger

twenty-nine。 Q: what is the difference between blockchain ledger and general ledger?

First, in fact, the main difference is that the blockchain is a digital ledger that can be easily dispersed. The probability of error in this method is much lower than that in the general ledger. Ordinary ledgers are prepared manually or manually, while the blockchain performs all tasks automatically. You just need to configure it in an appropriate way and follow all the guidelines.

thirty。 Q: distributed digital ledgers are used to record transactions in BlockChain. What does the system depend on?

It depends on network nodes.

The above questions come from: https://mindmajix.com/blockchain-interview-questions

thirty-one。 Q: what is the function of the trapdoor function and why is it required by the blockchain?

A trapdoor function is easy to calculate in one direction but difficult to calculate in the opposite direction, unless you have special information. Trapdoor functions are essential for public key encryption, so they often develop addresses and private keys that represent ideas in blockchain.

thirty-two。 Q: how are transactions and blocks in a Bitcoin implementation encrypted?

Bitcoin blocks are not encrypted in any way: each block is public. What prevents modification and data integrity is a value called a block hash. The contents of the block are handled using a special Hash function in Bitcoin, and its implementation and the resulting value are included in the block chain.

thirty-three。 Q: explain why blockchain requires a pass.

Tokens / passes are used to achieve changes between states. When someone makes a transaction, it is a change of state, moving tokens from one address to another. In addition, transactions can include additional data and state changes to change the data to do this the only way to invariably define the blockchain. Technically, blockchain does not need tokens for its main business, but without them, other ways need to introduce management chain status and verify transactions.

thirty-four。 Q: how do peers work in peer-to-peer (P2P) networks?

When a new node starts, it knows nothing about the network because there is no central server. Typically, developers provide a list of trusted nodes that are written directly into code that can be used for initial peer discovery.

thirty-five。 Q: how do I verify that checking a block is valid?

Each complete node on the network performs block verification. When a new block is declared, each node that receives it executes a checklist. The two most important checks are work proof (if a block provides enough work to be included in the chain) and the validity of all transactions (each transaction must be valid).

thirty-six。 Q: what is a ScriptPubKey? Explain how to use P2SH addresses.

One is the so-called locking ScriptPubKey script. It appears to block the output of the transaction and must be satisfied in the output process.

P2SH is a special type of address that replaces the hash value of a complex locking script. When a transaction that attempts to spend output is displayed later, in addition to unlocking the script, it must also contain a script that matches the hash.

thirty-seven。 Q: use a script to write a redeem script script that allows the user to use the output only if the user knows the magic number 1234567.

OP_EQUALVERIFYscriptPubKey: 1234567 OP_EQUALVERIFYscriptSig: 1234567

thirty-eight。 Q: use a script to write a redeem script script that allows anyone to spend at least 30 days after an aging.

ScriptPubKey: "30d" OP_CHECKSEQUENCEVERIFY OP_VERIFYscriptSig: empty

thirty-nine。 Q: what is mining?

Mining is the process of reaching a consensus in the block chain network. Mining serves two purposes. First, it creates a new token in the generated block. Second, it provides proof of work to the network, including transactions in distributed billing; that is, to prove that the generated block is valid.

forty。 Q: what is soft bifurcation?

The blocks in the ledger are included in the way of establishing the longest chain, that is, the chain with the greatest cumulative difficulty. Bifurcation is that two candidate blocks compete to form the longest block chain, and the proof methods for two miners to find work problems do not synchronize each other's situation in a very short time. Causes network segmentation because some nodes get blocks from miner # 1 and others get miner # 2.

Bifurcations are usually resolved in one block, because the probability of this happening again becomes very low, and because the next block appears, there will soon be a new longest chain that will be considered primary.

Note: this fork is different from the hard fork, which is because some developers decided to create a backward compatible change to the blockchain protocol, resulting in two forever different blockchains. )

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