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Blockchain technology, how many of the four core technologies of blockchain do you know?

Time : 09/10/2021 Author : vtmw6c Click : + -
        The name blockchain itself is quite unique. It is composed of blocks and chains. The content of each block in the blockchain is relatively fixed. Generally, there are some data records: the hash value of the previous block in the block header, the final random number of the block, the volume of the block, and the specific information of the transaction, such as the parties to the transaction and their digital signatures, transaction volume, etc. The hash value contained in each block header is like the "digital fingerprint" of all the data in the previous block, so there is a kind of interlocking "relationship" between each block, which forms a chain, so that once any character of the old blockchain data is changed, all the subsequent hash values will change.
        Such a structure and content constitute the whole blockchain. The most attractive thing about blockchain is its distributed storage mechanism, that is, the idea of decentralization. The information records on every block in the blockchain are recorded by every computer involved in accounting, that is, the node competition, and there is no enterprise or company behind it. In order to prevent some malicious nodes from destroying, the new data in the blockchain using the pow consensus mechanism needs to be unanimously confirmed and agreed by most nodes, and at least 51% of the nodes need to agree. Therefore, it is difficult for a node to tamper with the data. As a blockchain that can transmit value, it is certainly incredible if security depends only on the number of nodes, so blockchain uses a killer mace &mdash& mdash; Cryptography.
        Asymmetric encryption technology in cryptography is an important part to ensure security. Symmetric encryption is equivalent to using the same key to open and lock the door, while asymmetric encryption is equivalent to using two different keys to open and lock the door, one is called public key, the other is called private key. Public key locks the door, and only the private key can open, while private key locks the door, and only the public key can open the door. These two keys are generally stored in the wallet. Once the private key is lost, the assets will disappear. In blockchain, the public key and private key are formed through multiple transformations such as hash algorithm and elliptic curve algorithm. The characters are relatively long and complex, so they are relatively safe. In order to ensure that nodes are willing to take the initiative to account, blockchain has formed an important consensus mechanism, which is also known as the soul of blockchain.
        Pow (algorithm mechanism) is an initial consensus mechanism. All participating nodes compete for bookkeeping rights by competing for computing power. This is a relatively fair and decentralized way, but everyone participates, but only one node can be selected, which will waste a lot of resources and time costs. Therefore, there is a consensus mechanism of POS (proof of equity mechanism) later. The longer you hold digital currency, the more assets you hold, the more likely you are to obtain bookkeeping rights and rewards, saving time. However, some people say that this violates the original intention of decentralization and is prone to Matthew effect; Later, dpos (delegated proof of interest mechanism) appeared. The node selects a representative node to proxy verification and bookkeeping, which is more simple and efficient. However, some people say that this also sacrifices some decentralization to a certain extent.
        The above is the core technology of blockchain. Of course, blockchain also applies to many other disciplines and technologies, such as mathematics, economics, computer science and so on, which together build the magic technology of blockchain. Return to Sohu to see more.
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