Research And Implementation Of Key Techniques Of Decentralized Transaction System Based On Blockchain

Traditional centralized e-commerce transaction systems have many security issues,such as the untrustworthiness of third-party services,the high cost of fund custody,and the leakage of user privacy.How to implement a decentralized trading platform that allows users to perform point-to-point transactions has important practical significance.The main work of this paper is to design and build a decentralized distributed transaction system based on blockchain technology.The system uses a layered architecture with application layer,SDK middle layer,smart contract layer,and underlying technical support layer from top to bottom.All transactions are completed through the Ethereum blockchain,which effectively guarantees the security and credibility of transactions.Compared with other existing blockchain platforms,this topic proposes an improved implementation of the SHA256 algorithm and a secure information transmission model combined with the RSA algorithm to ensure the credibility and immutability of information transmission.At the same time,a user credit value mechanism is created to promote normal transactions and reduce malicious transaction operations.The key technologies involved are information processing based on the improved SHA256 algorithm,data credible transmission based on the information transmission model,forward transaction behavior incentives based on the credit value mechanism,secure transaction process management based on smart contracts,and assistance based on off-chain databases Information storage and reusable SDK package integration.Through system testing and security auditing,a blockchain-based distributed transaction system can securely and effectively guarantee users' decentralized transaction operations.