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Blockchain overview,Full version) blockchain overview courseware PPT document

Time : 14/07/2022 Author : 08bst3 Click : + -
        Blockchain is a new decentralized infrastructure and distributed computing paradigm gradually emerging with the increasing popularity of digital cryptocurrencies such as bitcoin. At present, it has attracted great attention and extensive attention from government departments, financial institutions, technology enterprises and the capital market. Blockchain technology has the characteristics of decentralization, time series data, collective maintenance, programmability, security and credibility, and is particularly suitable for building programmable currency system, financial system and even macro social system. The blockchain is essentially a disintermediated database, which is a series of data blocks generated by using cryptography methods. Each data block contains the information of a bitcoin network transaction, which is used to verify the validity of its information and generate the next block.
        Blockchain is a new application mode of computer technology such as distributed data storage, point-to-point transmission, consensus mechanism and encryption algorithm. It is a technical solution to collectively maintain a reliable database through decentralization and trust. From the perspective of technology, blockchain is not a single technology, but the result of integration of multiple technologies. These technologies are combined with a new structure to form a new way of data recording, storage and expression. Data perspective blockchain is a distributed database that can hardly be changed. The "distributed" here is not only reflected in the distributed storage of data, but also in the distributed record of data (that is, it is maintained jointly by system participants).
        Theoretically, blockchain technology can make payment and Alipay no longer have value. Blockchain enables people to cooperate with each other in case of mutual distrust and absence of neutral central institutions. The fight against counterfeit currency and financial fraud will not be needed in the future. Under the centralized network system, the maintenance and operation of the system depend on the operation and operation of the data center and other platforms, and the cost cannot be omitted. Everyone can participate in the nodes of the blockchain. While participating in the recording, each node also verifies the correctness of the results recorded by other nodes, which improves the maintenance efficiency and reduces the cost. In a system with many nodes, each node has a high degree of autonomy.
        The nodes can be freely connected to each other to form a new connection unit. Any node may become a phased center, but it does not have a mandatory center control function. This open, flat and equal system phenomenon or structure is called decentralization. In short, centralization means that the center determines the node. Nodes must depend on the center, and nodes cannot survive without the center. In a decentralized system, anyone is a node and anyone can become a center. Any center is not permanent, but phased. No center is mandatory for nodes. People's financial behavior is heavily dependent on.
        But the savings in the bank are not absolutely safe. This is because most of the deposits are used for lending. When more than 20% of depositors withdraw money at the same time, they will not be able to pay. So when people save their money, they face the potential risk of default. In fact, this risk has become a real crisis many times. Bitcoin has successfully realized the decentralization of digital currency in technology. Bitcoin shows the possibility of a digital currency that is not controlled by any central institution and cannot maliciously create inflation. The technical possibility of reforming the modern financial and monetary system. Another example is that market economy can be regarded as a decentralized economic system. Price, production and consumption are determined by various market players.
        The planned economy is a centralized economic system. The State Planning Commission is responsible for determining the prices and output of various commodities. China has gradually reduced the proportion of the planned economy, a centralized economic system, in our economy. Up to now, China has become a fairly market-oriented economy. During this period, we have achieved more than 30 years of high-speed economic development. There are also quite a few examples to show that centralization and decentralization are neither absolutely who is superior or who is inferior, nor are they completely opposite. In some specific scenarios, centralization has its advantages, while in other cases, decentralization has higher efficiency. In more cases, a large system has both centralized and decentralized parts.
        Asymmetric encryption and authorization technology, the transaction information stored on the blockchain is public, but the account identity information is highly encrypted and can only be accessed with the authorization of the data owner. Asymmetric encryption enables and authorizes the technology package, including the functional data stored on the chain s of block a in the code area h, which is public and open in the information. However, the information of the account generation ID code is encrypted with high technology and can only be accessed under the authorization of the data owner.
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