广东省公需课区块链答案,广东2020公需课区块链接

随着科技的发展，区块链技术也在不断发展，广东省也开始推行公需课区块链课程，让更多的人了解区块链技术。本文将介绍三个相关关键词：去中心化、智能合约和共识机制。

去中心化：去中心化是指没有中心化的组织，这意味着没有一个实体或者组织能够控制或影响整个系统。去中心化的系统通常是分布式的，它们由许多节点组成，每个节点都可以提供服务。去中心化的系统比传统的中心化系统更加安全，因为它们不会受到单一节点的影响。区块链技术就是一种去中心化的技术，它可以让用户在不需要信任的情况下安全地进行交易。

智能合约：智能合约是一种基于区块链技术的自动执行合约。它是一种计算机程序，可以在双方之间执行交易，并自动执行双方之间的协议。智能合约可以让双方不必信任彼此，而是通过技术来保证双方的利益。智能合约的优势在于它可以节省时间，减少人工干预，提高交易效率，并且可以防止欺诈行为。

共识机制：共识机制是一种用于确认交易的技术，它可以确保交易的安全性和可靠性。共识机制是一种分布式共识算法，它可以让网络中的参与者在不需要信任的情况下安全地进行交易。共识机制可以确保每个交易都是有效的，并且可以防止欺诈行为。区块链技术的共识机制可以让用户安全地进行交易，而不需要信任任何一方。

总之，去中心化、智能合约和共识机制是区块链技术的三个重要关键词，它们可以帮助用户安全、可靠地进行交易。广东省推出公需课区块链课程，可以让更多的人学习和了解区块链技术，从而推动社会的发展。

1. What exactly is Bitcoin mining calculating? Manually verify the blockchain and give the answer

Briefly review the mining process.

First, all transactions must be verified and problematic ones eliminated, and then a set of custom criteria are used to select which transactions are to be included in the block, such as the transaction fee provided and the amount occupied by the transaction. Such transactions are considered profitable only if the ratio of byte sizes exceeds a certain threshold. Of course, nodes can also deliberately choose to include a certain transaction, or deliberately ignore certain transactions. If you mine through a mining pool, the mining pool's server will screen the transactions and then assign an independent task to each participating mining machine.

Once the transaction data is filtered and reduced layer by layer, a Merkle tree can be calculated through these transactions, and a unique summary can be determined, which is the root of the Merkl tree.

Then we obtain other information needed for mining in turn, which forms the header of a block.

Byte allocation of block header

The block header is only 80 bytes, and mining only needs to operate on the block header. The transaction data is fixed through the merkle tree and does not need to be included.

Much of this information is already fixed or computable.

Let’s take block 277316 as an example. The information comes from the website http://blockchain.info

Bitcoin Block #277316blockchain.info

Select this block The reason is that in the book "Mastering Bitcoin", the Chinese community translation and the English original version are different in introducing this part of the content, and the author Antonopoulos did not mention a key point, which is the issue of byte order. I believe many people may Step on this trap. The details restored here can help readers and books make cross-references.

Please pay attention to each step below and every change. This is the core algorithm of Bitcoin.

When converting time, remember that it must be converted to UTC timestamp. There have been pitfalls here, so be careful.

The discovery of this step is extremely difficult and consumes a lot of inquiries. Big pits, big pits, please bear in mind. The inventor Satoshi Nakamoto may have changed to a coding method that is closer to the machine, little-en, in order to make the machine calculation faster.dian.

The final result is

The first 15 0s, then 1 in hexadecimal; and the number corresponding to the difficulty target is

Hexadecimal Make the first 15 zeros, then 3. The calculated result is less than the difficulty target and meets the requirements. This result is consistent with the figures published on the website.

When mining, the nonce random number is unknown and needs to be tried from 0 to 2^32. However, this number is actually not large, only 4294967296. With the current mining machine, the computing power is 14T per second. , it doesn’t take even one second to calculate everything up to the upper limit. As mentioned just now, in this case, the incidental information in the currency creation transaction needs to be used, and the additional string becomes the extra nonce.

In addition, the genesis block can also be verified through the above method. Friends who are curious can try it.

Tips:

2. Blockchain is the answer to the problem of risk control system

Finance has three elements: security, profitability and liquidity

What these three have in common is the conflict between the present and the future in space and time. Conflict is an unstable factor that must be restrained through the design of power, and the restraint of this power design is control. This control process corresponds to the principle of equivalent exchange, or conflict defensive design. Original link

Let’s take a look at the principles of this defensive design:

First, we need to do an evaluation. Let’s first look at the definition of risk assessment:

Before or after a risk event occurs (but it has not yet ended), the impact and possibility of losses caused by the event to people’s lives, lives, property, etc. quantitative assessment work.

In other words, risk assessment is to quantitatively evaluate the possible degree of impact or loss caused by an event or thing. From the perspective of information security, risk assessment is an assessment of the threats, weaknesses, and impacts faced by information assets (i.e., the set of information about an event or thing), as well as the possibility of risks caused by the combined effect of the three. sexual assessment. As the basis of risk management, risk assessment is an important way for organizations to determine information security needs and is part of the planning process of the organization's information security management system. We need to realize that people have motivations, while machines and programs only have instructions. This is an important difference between humans and machines.

The following are the issues faced in the process management of defensive design of risk control:

What is the object (or asset) to be protected? What is its direct and indirect value?

What potential threats do assets face? What causes the threat? How likely is it that the threat will occur?

What weaknesses exist in the assets that could be exploited by threats? What about ease of exploitation?

Once a threat event occurs, what kind of losses will the organization suffer or what negative impacts will it face?

What security measures should the organization take to minimize the losses caused by risks? ?

The process of solving the above problems is the process of risk assessment.

When conducting risk assessment, there are several correspondences that must be considered:

Each asset may face multiple threats

Threat sources (threat agents) There may be more than one

Each threat may exploit one or more system weaknesses

The risk control system is a system about motivation and process management. Motivation and process management are the basic logic of the risk control system. Have you noticed that these are all human designs. Human design is based on knowledge structure and empirical judgment. Based on the principles of cases and statistics, there is due diligence.

Yet inquiry is rooted in the uncertainty of space and time; inquiry is motivated by the desire to bring the future and the present into agreement. Please note that this is still a human design. Just as all investigation reports are written by people, the information and data that people refer to are also written by people. So, here comes the key point, can the programs set by humans be replaced by technology? This question may have been unanswerable in the past, but now it has an answer.

The answer may be blockchain.

3. Continuing education: the most fundamental feature of the blockchain network

The most fundamental feature of the blockchain network is the blockchain. Its core idea is Decentralization, the biggest subversion of blockchain is the establishment of credit, and the collective maintenance of blockchain can reduce costs. Public Blockchain Network A public blockchain is a blockchain that anyone can join and participate in, such as Bitcoin. Disadvantages may include the large amount of computing power required, little or no privacy for transactions, and weak security.
1. Blockchain is a serial transaction record that uses cryptography to connect and protect content. It is a new application model of computer technologies such as distributed data storage, point-to-point transmission, consensus mechanism, and encryption algorithm. As an important concept of Bitcoin, blockchain is essentially a decentralized database. As the underlying technology of Bitcoin, it is a series of data generated using cryptographic methods.

4. Where can I find the answers to Xindao Cloud Blockchain Training Platform

Xindao Cloud WeChat public account. According to relevant information, Xindao Cloud Blockchain Training Platform is a Chinese practical teaching cloud platform that mainly teaches users modern blockchain and Internet knowledge. The answer to Xindao Cloud’s blockchain training platform is that it can be used in Xindao Cloud. If the cloud WeChat official account is found, as long as the user follows the official account and sends a question, the answer and analysis of the question will be displayed.

5. What does blockchain mean and how to make money

The meaning of blockchain and how to make money are as follows:
1. The meaning of blockchain: Blockchain is After a piece of information is confirmed by multiple parties, it is finally stored in multiple places. It is a tool that can solve credit problems during transactions.
2. How to make money with blockchain:
(1) Provide blockchain technology services. Form a corporate team to specialize in the development and application of blockchain technology, and provide your technical results to companies in need for use, or develop corresponding blockchain technology based on the needs of service recipients. A simple understanding is to be a middleman.
(2) Use blockchain technology to issue coins. This method is that the company acts as an issuer and releases a certain number of virtual coins for others to invest, such as Bitcoin, Litecoin, and Dogecoin. At that time, if you wanted to become an issuer, in addition to having blockchain technology, you also had to apply for a series of filing documents and materials such as business qualification certificates and currency issuance qualification licenses from relevant regulatory authorities. Otherwise, if you don’t have these documents, it would be fraud. . However, successfully preparing these documents will still test the strength and capital of the company. If the funds are not strong enough, it will be difficult to sustain.
(3) Payment for blockchain knowledge. In the early days of the blockchain market, many people did not understand what blockchain was and wanted to participate, which inevitably gave rise to a blockchain knowledge payment market. Since this year, many public accounts with the theme of blockchain have appeared, and many paid blockchain courses and small investment circles have been born.
(4) Register to receive free candies. Candy is a token that the blockchain project team rewards early users in order to attract more users to join the early use and spread. Similar to the early "Didi", in order to cultivate a large number of early users, a large number of free taxi tickets were issued to users.

6. Lesson 4 Cryptozoology Learning Summary in Blockchain

This is the fourth lesson of deep learning in Ulord. Dr. Yang will give a lecture on cryptography in blockchain. This course has helped me understand a question that has been bothering me.The issue of public key and private key, what is the relationship between them? I got the answer in this study, and now I will share with you what I learned.

The public key and private key in the blockchain are two basic concepts in asymmetric encryption.

Public key and private key are a key pair obtained through an algorithm. The public key is the public part of the key pair, and the private key is the non-public part. Public keys are usually used to encrypt conversations, that is, messages or information, and can also be used to verify digital signatures signed with private keys.

The private key can be used to sign and the corresponding public key can be used for verification. The key pair obtained through this public key system can be guaranteed to be unique worldwide. When using this key pair, if you use one of the keys to encrypt data, you must use its corresponding other key to decrypt it.

For example, data encrypted with a public key must be decrypted with a private key. If encrypted with a private key, the corresponding public key must be used to decrypt it, otherwise the decryption cannot be successful. In addition, in the Bitcoin blockchain, the public key is calculated through the private key, and the address is calculated through the public key, and this process is irreversible.