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The classification of blockchain is worth collecting here!

Time : 03/07/2022 Author : 4ubjzs Click : + -
        As for the classification of blockchains, common ones include public chains, alliance chains and private chains. This classification is based on the perspective of public scope. This paper combs three classifications of blockchain from three dimensions. Public chain is a completely decentralized blockchain. It means that any individual or team in the world can send transactions, and the transactions can be effectively confirmed by the blockchain, and anyone can participate in its consensus process. Public chain is the earliest blockchain and the most widely used blockchain type at present. All major virtual currencies represented by bitcoin are based on public chain, and a virtual currency only corresponds to a public chain. However, on the contrary, a public chain may run a variety of virtual currencies. For example, many virtual currencies actually rely on the bitcoin blockchain chain.
        Each node of the public chain can freely join and exit, and participate in the reading and writing of data on the chain. The topological relationship of each node is flat, and there are no centralized service end nodes in the network. A private chain is a blockchain that is limited to a certain range. External nodes cannot join the blockchain network. The write permission of each node of the private chain is under internal control, and the read permission can be selectively opened to the public according to needs. The private chain still has the general structure of blockchain multi node operation, which is suitable for internal data management and audit of specific institutions. The alliance chain is multi centric, and the permissions of different nodes are different. Nodes that meet certain conditions become core nodes. They are often designated by an internal multiple preselected nodes as bookkeepers. The generation of each block is determined by all nodes through the consensus mechanism, and other access nodes can participate in transactions, but not in the bookkeeping process.
        Anyone else can query permissions through the open API of the blockchain. The essence of the alliance chain is distributed trusteeship bookkeeping. How to determine the node of each bookkeeping and the consensus mechanism of the alliance chain are the core and key points of the blockchain. Each node of the alliance chain usually has its corresponding entity organization, which can join and exit the network only after authorization. All structural organizations form interest related alliances to jointly maintain the healthy operation of the blockchain. From the perspective of authority management, blockchain involves the authority of each node, such as whether it can intervene in the blockchain network, whether it can participate in the authentication of new blocks, whether it can conduct transactions, etc. different nodes may have different permissions and play different roles in the blockchain network.
        In addition, there are more advanced permissions, which can manage, authorize or deprive the authorization of other nodes. From this perspective, blockchains can be divided into three types. The license free blockchain is a blockchain system without authority management. All participants have the same full authority and can carry out all activities. For example, bitcoin blockchain belongs to this type. Limited license blockchain is a blockchain system in which different nodes have different permissions. Under such systems, participants' activities are limited. For example, some participants can only trade existing assets, others can issue new assets, some participants can only verify transactions, others can synchronize transaction records into the ledger, some participants can only read the ledger data, and others can write data.
        The financial industry mostly belongs to this type. Permissive blockchain means that not only different participants have different permissions, but also some advanced nodes can manage permissions and deprive or grant permissions to other nodes. The above three classification standards are not mutually inclusive, but parallel and independent. For example, the blockchain of bitcoin is a blockchain that does not require the participation of a specific majority of people, does not require the mutual trust of participants, and has no authority management, that is, a public blockchain that does not require mutual trust and license. Therefore, when applying blockchain to specific business fields, it is necessary to select the appropriate type of blockchain according to the requirements and purposes of the business.
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