Design And Implementation Of Blockchain-based International Cold Chain Trade Platform

The international cold chain trade platform serves as a trading bridge between overseas suppliers and domestic small and medium-sized customers,providing comprehensive services such as cross-border procurement,supply chain finance,warehousing,and logistics.However,the current centralized operation mode of the trade platform has trust issues,as the data is typically managed and controlled by the platform operator,and the authenticity of the data cannot be guaranteed.Meanwhile,international trade activities often involve lengthy processes and slow capital turnover,coupled with the cumbersome bank credit procedures,which may lead to financing difficulties for small and medium-sized enterprises.This paper applies blockchain technology to the international cold chain trade platform,utilizing the characteristics of immutability and traceability of blockchain,as well as cryptographic techniques such as homomorphic encryption and zero-knowledge proofs to address issues in the traditional model.The specific research works in this paper are as follows:(1)To address the trust issues of centralized operation mode in platform,this paper proposes a blockchain-based international cold chain trade platform system model and a data privacy storage framework based on MySQL,blockchain,and IPFS.Plain text data is stored in MySQL while file data is stored in IPFS.As the platform’s business data is huge and contains sensitive commercial information,complex data is partitioned,encrypted,and compressed.The desensitized data is then stored in blockchain.Additionally,symmetric and asymmetric encryption technologies are applied to IPFS file addresses to achieve encrypted storage and finegrained access control.With this data storage scheme,business data privacy is ensured while the trustworthiness of the data is improved.(2)Aiming to address the financing difficulties faced by small and medium-sized enterprises(SMEs)in China,this paper proposes a privacy protection solution based on zero-knowledge proofs.Through cryptographic techniques,the proposed solution enhances the trust between customer enterprises and financial institutions,thereby resolving the credit assessment problem for SMEs on the platform.The solution combines blockchain with Bulletproofs zero-knowledge proof protocol,extending the proof range of standard values from[0,2n)to any range of[χ,2n).Small and medium-sized enterprises can generate a zero-knowledge proof for their total transaction amount on the platform,which can prove that the value is indeed greater than a certain value x without revealing the plaintext value.Experimental results show that the proof size is within 1KB,and the execution time of critical steps is in the millisecond range.(3)Based on the system model and data privacy storage framework design,a blockchainbased international cold chain trading platform was developed,and the privacy protection solution based on zero-knowledge proofs was implemented in the trade finance module.The ChainMaker consortium chain network and IPFS private network were setup,and the blockchain management platform and blockchain browser were deployed,and smart contracts were installed on the chain.The user management module,order management module,file management module,and trade finance module in the platform were implemented in code.The system was subjected to functional testing and performance testing to ensure its availability and stability.In conclusion,the blockchain-based international cold chain trade platform designed and implemented in this paper has positive significance for promoting the practical application of consortium chain technology.