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Blockchain application exercise mind map
Publish: 2021-03-28 19:20:49
1.
Because the design of blockchain is a kind of protection measure, such as distributed computing system with high fault tolerance. Blockchain makes hybrid consistency possible. This makes blockchain suitable for recording events, titles, medical records and other activities that need to include data, identity management, transaction process management and provenance management. Blockchain has great potential for financial disintermediation and has great influence on guiding Global trade
extended data :
1. Blockchain is a new application mode of computer technology such as distributed data storage, point-to-point transmission, consensus mechanism, encryption algorithm, etc. The so-called consensus mechanism is a mathematical algorithm to establish trust and obtain interests between different nodes in the blockchain system
2. Blockchain is an important concept of bitcoin, which is essentially a disintermediated database and the underlying technology of bitcoin. Blockchain is a series of data blocks generated by cryptography. Each data block contains the information of a bitcoin network transaction, which is used to verify the validity of the information (anti-counterfeiting) and generate the next block
3. Blockchain - the original blockchain is a kind of decentralized database, which contains a list called blocks, with continuously growing and orderly records. Each block contains a time stamp and a link with the previous block. The block chain is designed so that the data can not be tampered with. Once recorded, the data in a block will be irreversible
references : blockchain network
2. Blockchain is a technology, but it is not a single technology, but the result of the integration of a variety of technologies, including cryptography, mathematics, economics, network science and so on. You can think of it as a distributed shared accounting technology, or as a database, but the database is jointly maintained by all nodes in the chain, and each node has an account book. Because the account books of all nodes are consistent, different nodes can trust each other, and there is no doubt about the data, so we all say that the blockchain has realized trust technically. For detailed professional technology, you can consult some professional technology companies, such as Jinbo technology, which focuses on the development of blockchain related procts, professional R & D team and perfect after-sales service, and you can consult by telephone.
3. 1、 Decentralization:
blockchain technology does not rely on additional third-party management institutions or hardware facilities, and there is no central control. In addition to the self-contained blockchain itself, each node realizes information self verification, transmission and management through distributed accounting and storage. Decentralization is the most prominent and essential feature of blockchain< Second, openness:
the foundation of blockchain technology is open source. In addition to the private information of all parties to the transaction is encrypted, the data of blockchain is open to all. Anyone can query blockchain data and develop related applications through the open interface, so the information of the whole system is highly transparent< Third, independence:
based on consensus specifications and Protocols (similar to various mathematical algorithms such as hash algorithm used by bitcoin), the whole blockchain system does not rely on other third parties, and all nodes can automatically and safely verify and exchange data in the system without any human intervention< Fourth, security:
as long as 51% of all data nodes cannot be controlled, the network data cannot be arbitrarily controlled and modified, which makes the blockchain itself relatively safe and avoids subjective and artificial data changes
5. Anonymity:
unless there are legal requirements, technically speaking, the identity information of each block node does not need to be disclosed or verified, and information transmission can be carried out anonymously
Digital China is the first major development strategy explicitly put forward in the report of the 19th National Congress of the Communist Party of China. The application of digital technology represented by cloud computing, big data and mobile Internet is no longer limited to the economic field, but widely penetrated into all aspects of public services, social development and people's life, which requires macro coordination, overall control and integrated development
with the deepening of a new round of scientific and technological revolution and instrial change, the tide of digital economy in the world is unstoppable. The development of digital economy has become a global consensus, known as the key to the fourth instrial revolution
adhering to the connotation of the University of nice's world inclusive humanistic spirit, always embracing change, standing up to the tide, conforming to the development trend of the digital economy era, and integrating the essence of Chinese and Western cultural thinking, the University of nice's doctor of blockchain and digital economy management (DDE) came into being
based on this, we can enable the managers of digital economy instry to have global vision and global integration thinking, integrate knowledge, operate digital economy intelligently, promote the sustainable development of the instry, and contribute to the community of human destiny. Therefore, DDE project will cooperate with colleagues in the field of digital economy
if you have MBA related questions, you are welcome to contact me personally&# 180;&# 65381;&# 7447;&# 65381;` ) Bixin~~~~
blockchain technology does not rely on additional third-party management institutions or hardware facilities, and there is no central control. In addition to the self-contained blockchain itself, each node realizes information self verification, transmission and management through distributed accounting and storage. Decentralization is the most prominent and essential feature of blockchain< Second, openness:
the foundation of blockchain technology is open source. In addition to the private information of all parties to the transaction is encrypted, the data of blockchain is open to all. Anyone can query blockchain data and develop related applications through the open interface, so the information of the whole system is highly transparent< Third, independence:
based on consensus specifications and Protocols (similar to various mathematical algorithms such as hash algorithm used by bitcoin), the whole blockchain system does not rely on other third parties, and all nodes can automatically and safely verify and exchange data in the system without any human intervention< Fourth, security:
as long as 51% of all data nodes cannot be controlled, the network data cannot be arbitrarily controlled and modified, which makes the blockchain itself relatively safe and avoids subjective and artificial data changes
5. Anonymity:
unless there are legal requirements, technically speaking, the identity information of each block node does not need to be disclosed or verified, and information transmission can be carried out anonymously
Digital China is the first major development strategy explicitly put forward in the report of the 19th National Congress of the Communist Party of China. The application of digital technology represented by cloud computing, big data and mobile Internet is no longer limited to the economic field, but widely penetrated into all aspects of public services, social development and people's life, which requires macro coordination, overall control and integrated development
with the deepening of a new round of scientific and technological revolution and instrial change, the tide of digital economy in the world is unstoppable. The development of digital economy has become a global consensus, known as the key to the fourth instrial revolution
adhering to the connotation of the University of nice's world inclusive humanistic spirit, always embracing change, standing up to the tide, conforming to the development trend of the digital economy era, and integrating the essence of Chinese and Western cultural thinking, the University of nice's doctor of blockchain and digital economy management (DDE) came into being
based on this, we can enable the managers of digital economy instry to have global vision and global integration thinking, integrate knowledge, operate digital economy intelligently, promote the sustainable development of the instry, and contribute to the community of human destiny. Therefore, DDE project will cooperate with colleagues in the field of digital economy
if you have MBA related questions, you are welcome to contact me personally&# 180;&# 65381;&# 7447;&# 65381;` ) Bixin~~~~
4. Python is an interpretive, object-oriented, dynamic data type high-level programming language, which is easy to understand, powerful and easy to use. However, for Python self-study, it depends on everyone's situation. Although the language is simpler than other programming languages, it has a third-party library, and you want to master Python course by self-study, There is still a certain degree of difficulty, it is suggested that before learning, you can simply do it yourself, and then decide the way of learning based on the actual situation.
5. Wake up, young man. You can't find Ma Yun and Ma Huateng here. They never look at these problems. If you want to find them, you can only find a way to make some achievements by yourself, let them see and attract them, instead of taking the initiative to find them. Because there are too many people looking for them to invest every day, they may not be able to get in, So you need to do your own project, and after you get results, if they find out and have a very big market prospect, they will invest money decisively. I hope my answer can help you.
6. This happens occasionally. It doesn't matter. Don't worry about him. Just click Cancel
it's dangerous if it happens frequently. If it doesn't work well, you have to reload the system
the memory can't be read written for common reasons
people using Windows operating system sometimes encounter such an error message: "ox ﹤ x ﹤ x ﹤ x ﹤ x ﹤ x ﹤ x ﹤ x ﹤ x ﹤ x 65???????? Instruction refers to the memory of 0x00000000, which cannot be "written", and then the application is shut down. If you go to consult some "experts", the answer is often indignation and disdain like "windows is so unstable". In fact, this error is not necessarily caused by the instability of windows. This article will simply analyze the common causes of this error
first, the application program fails to check the memory allocation.
when the program needs a piece of memory to save data, it needs to call the "function" provided by the operating system to apply. If the memory allocation is successful, the function will return the newly opened memory area address to the application program, and the application program can use this memory through this address. This is called "dynamic memory allocation", and memory address is also called "pointer" in programming
memory is not always available, and sometimes memory allocation fails. When the allocation fails, the system function will return a value of 0. At this time, the return value "0" does not represent the newly enabled pointer, but a notification sent by the system to the application that an error has occurred. As an application, it should check whether the return value is 0 after every memory application. If it is, it means that there is a failure and some measures should be taken to save it, which enhances the "robustness" of the program
if the application does not check this error, it will consider this value as the available pointer allocated to it according to "thinking inertia" and continue to use this memory in the future. The real 0 address memory area is the most important "interrupt descriptor table" in the computer system, which is absolutely not allowed to be used by applications. In the operating system without protection mechanism (such as DOS), writing data to this address will cause an immediate crash. In the robust operating system, such as windows, this operation will be immediately captured by the protection mechanism of the system. As a result, the operating system will forcibly shut down the application with errors to prevent the expansion of errors. At this time, the above "write memory" error will appear, and the referenced memory address is "0x00000000"
there are many reasons for memory allocation failure, such as insufficient memory and mismatched versions of system functions. Therefore, this kind of allocation failure often occurs after the operating system has been used for a long time, many kinds of application programs (including virus programs that are inadvertently "installed") have been installed, and a large number of system parameters and system files have been changed
Second, because of its own bug, the application program refers to an abnormal memory pointer
in the application program using dynamic allocation, sometimes there is such a situation: the program attempts to read and write a "should be available" memory, but somehow, the expected available pointer has failed. It may be that you "forgot" to ask the operating system for allocation, or that the program itself has written off this memory at some time and "didn't pay attention" and so on. The logged out memory is recycled by the system, and its access right does not belong to the application. Therefore, the read-write operation will also trigger the protection mechanism of the system. The only end of the program that attempts to "break the law" is to be terminated by the operation and recover all resources. The law of the computer world is still much more effective and severe than that of human beings! Cases like this are bugs of the program itself, and you can often reproce errors in a specific sequence of operations. The invalid pointer is not always 0, so the memory address in the error prompt is not necessarily "0x00000000", but other random numbers
if the system often mentions error prompts, the following suggestions may be helpful:
1. Check whether there are trojans or viruses in the system. In order to control the system, these programs often modify the system irresponsibly, which leads to the operating system exception. Generally, we should strengthen the awareness of information security and never be curious about the executable program with unknown source
2. Update the operating system, make the installation program of the operating system the correct version of the system files again, and correct the system parameters. Sometimes the operating system itself will have bugs, so pay attention to install the official upgrade program
3. Try the new version of the application
hope it can help you!
it's dangerous if it happens frequently. If it doesn't work well, you have to reload the system
the memory can't be read written for common reasons
people using Windows operating system sometimes encounter such an error message: "ox ﹤ x ﹤ x ﹤ x ﹤ x ﹤ x ﹤ x ﹤ x ﹤ x ﹤ x 65???????? Instruction refers to the memory of 0x00000000, which cannot be "written", and then the application is shut down. If you go to consult some "experts", the answer is often indignation and disdain like "windows is so unstable". In fact, this error is not necessarily caused by the instability of windows. This article will simply analyze the common causes of this error
first, the application program fails to check the memory allocation.
when the program needs a piece of memory to save data, it needs to call the "function" provided by the operating system to apply. If the memory allocation is successful, the function will return the newly opened memory area address to the application program, and the application program can use this memory through this address. This is called "dynamic memory allocation", and memory address is also called "pointer" in programming
memory is not always available, and sometimes memory allocation fails. When the allocation fails, the system function will return a value of 0. At this time, the return value "0" does not represent the newly enabled pointer, but a notification sent by the system to the application that an error has occurred. As an application, it should check whether the return value is 0 after every memory application. If it is, it means that there is a failure and some measures should be taken to save it, which enhances the "robustness" of the program
if the application does not check this error, it will consider this value as the available pointer allocated to it according to "thinking inertia" and continue to use this memory in the future. The real 0 address memory area is the most important "interrupt descriptor table" in the computer system, which is absolutely not allowed to be used by applications. In the operating system without protection mechanism (such as DOS), writing data to this address will cause an immediate crash. In the robust operating system, such as windows, this operation will be immediately captured by the protection mechanism of the system. As a result, the operating system will forcibly shut down the application with errors to prevent the expansion of errors. At this time, the above "write memory" error will appear, and the referenced memory address is "0x00000000"
there are many reasons for memory allocation failure, such as insufficient memory and mismatched versions of system functions. Therefore, this kind of allocation failure often occurs after the operating system has been used for a long time, many kinds of application programs (including virus programs that are inadvertently "installed") have been installed, and a large number of system parameters and system files have been changed
Second, because of its own bug, the application program refers to an abnormal memory pointer
in the application program using dynamic allocation, sometimes there is such a situation: the program attempts to read and write a "should be available" memory, but somehow, the expected available pointer has failed. It may be that you "forgot" to ask the operating system for allocation, or that the program itself has written off this memory at some time and "didn't pay attention" and so on. The logged out memory is recycled by the system, and its access right does not belong to the application. Therefore, the read-write operation will also trigger the protection mechanism of the system. The only end of the program that attempts to "break the law" is to be terminated by the operation and recover all resources. The law of the computer world is still much more effective and severe than that of human beings! Cases like this are bugs of the program itself, and you can often reproce errors in a specific sequence of operations. The invalid pointer is not always 0, so the memory address in the error prompt is not necessarily "0x00000000", but other random numbers
if the system often mentions error prompts, the following suggestions may be helpful:
1. Check whether there are trojans or viruses in the system. In order to control the system, these programs often modify the system irresponsibly, which leads to the operating system exception. Generally, we should strengthen the awareness of information security and never be curious about the executable program with unknown source
2. Update the operating system, make the installation program of the operating system the correct version of the system files again, and correct the system parameters. Sometimes the operating system itself will have bugs, so pay attention to install the official upgrade program
3. Try the new version of the application
hope it can help you!
7. 1. If you are looking for free online games, many, many...
2. After listening to your description, it seems that you are more interested in life skills, so I recommend you some free, comprehensive and interesting life skills (generally, life skills take time to improve, and you should be prepared for that, And you need a character to learn all life skills. I don't think it's possible. It seems that there isn't such a game yet. For example, [dragon OL] [world two], these two games are free, and I've played them myself (I'm also playing them now). Let's start with [world two]. Life skills are very comprehensive, mining, tree digging, proction, synthesis and so on, If you are interested, you can go to the official website and have a look for yourself. And I was also a life skill player when I played world two. If I worked harder, I could earn extra money[ Long OL] has 10 kinds of life skills (I don't want to introce them in detail. I'll see the official website for myself). If the level of life skills is high, there is a chance to make good equipment. It's normal to sell RMB. And it's more playable
3. That's it. I hope it can help you
2. After listening to your description, it seems that you are more interested in life skills, so I recommend you some free, comprehensive and interesting life skills (generally, life skills take time to improve, and you should be prepared for that, And you need a character to learn all life skills. I don't think it's possible. It seems that there isn't such a game yet. For example, [dragon OL] [world two], these two games are free, and I've played them myself (I'm also playing them now). Let's start with [world two]. Life skills are very comprehensive, mining, tree digging, proction, synthesis and so on, If you are interested, you can go to the official website and have a look for yourself. And I was also a life skill player when I played world two. If I worked harder, I could earn extra money[ Long OL] has 10 kinds of life skills (I don't want to introce them in detail. I'll see the official website for myself). If the level of life skills is high, there is a chance to make good equipment. It's normal to sell RMB. And it's more playable
3. That's it. I hope it can help you
8. Dragon eight~
as long as you find the medicine on the ground and have enough skill level, you can dig it~
no logging, take care of trees~
fishing~ As long as there are fish, skills enough, catch full package no problem~
Mining~ As long as you find a mine on the ground and have enough skill level, you can dig~< br /> http://tl.sohu.com/game/skill/normal/index.shtml
as long as you find the medicine on the ground and have enough skill level, you can dig it~
no logging, take care of trees~
fishing~ As long as there are fish, skills enough, catch full package no problem~
Mining~ As long as you find a mine on the ground and have enough skill level, you can dig~< br /> http://tl.sohu.com/game/skill/normal/index.shtml
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