Recently, the size of the used car market has been continuously increasing. In this used car trading market, various used car trading damage is caused by the asymmetry of information between the seller and buyer. In particular, there are many cases of damage caused by information asymmetry between the seller and buyer, and the reliability of the used car trading market is being deteriorated. In this study, we propose a used car transaction management system that guarantees reliability without the intervention of third parties by using smart contracts based on the public blockchain Ethereum. The public blockchain was used in the used car transaction management system to design a safe and reliable used car transaction management system based on the reliability of information on the used cars. In addition, smart contracts were used to design contracts for used car trading, allowing for safer trading while reducing the effort and time of the trading participants. This system mitigates the asymmetry of information between buyers and sellers through the characteristics of the blockchain that guarantees the integrity and transparency of data, and reduces and prevents brokerage commissions in the distribution process without third-party intervention. This system uses IPFS to store data using the Mongo database based on the Node.js server and returns the hash function stored in the smart contract.

近来，二手车市场的规模一直在不断增加。在这个二手车交易市场中，各种二手车交易损坏是由买卖双方之间信息不对称引起的。尤其是，由于买卖双方之间的信息不对称而导致损坏的情况很多，二手车交易市场的可靠性正在下降。在这项研究中，我们提出了一种二手车交易管理系统，该系统通过使用基于公共区块链以太坊的智能合约来确保可靠性而无需第三方干预。二手车交易管理系统中使用了公共区块链，基于二手车信息的可靠性设计了安全可靠的二手车交易管理系统。此外，智能合约被用来设计二手车交易的合约，从而在减少交易参与者的工作量和时间的同时，实现了更安全的交易。该系统通过保证数据完整性和透明性的区块链特性，减轻了买卖双方之间信息的不对称性，并在没有第三方干预的情况下减少并防止了分销过程中的经纪佣金。该系统使用IPFS通过基于Node.js服务器的Mongo数据库存储数据，并返回存储在智能合约中的哈希函数。该系统通过保证数据完整性和透明性的区块链特性，减轻了买卖双方之间信息的不对称性，并在没有第三方干预的情况下减少并防止了分销过程中的经纪佣金。该系统使用IPFS通过基于Node.js服务器的Mongo数据库存储数据，并返回存储在智能合约中的哈希函数。该系统通过保证数据完整性和透明性的区块链特性，减轻了买卖双方之间信息的不对称性，并在没有第三方干预的情况下减少并防止了分销过程中的经纪佣金。该系统使用IPFS通过基于Node.js服务器的Mongo数据库存储数据，并返回存储在智能合约中的哈希函数。