In recent years, food safety issues have drawn growing concerns from society. In orderto efficiently detect and prevent food safety problems and trace the accountability, building a reliabletraceability system is indispensable. It is especially essential to accurately record, share and trace the specificdata within the whole food supply chain including the process of production, processing, warehousing,transportation and retail. Traditional traceability systems have issues such as data invisibility, tamperingand sensitive information disclosure. Blockchain is a promising technology for food safety traceabilitysystem because of the characteristics such as irreversible time vector, smart contract, consensus algorithm,etc. This paper proposes a food safety traceability system based on blockchain and EPC InformationServices (EPCIS), and develops a prototype system. A management architecture of on-chain off-chaindata is proposed as well, through which the traceability system can alleviate the data explosion issue ofthe blockchain for Internet of Things (IoT). Furthermore, the enterprise-level smart contract is designedto prevent data tampering and sensitive information disclosure during information interaction amongparticipants. The prototype system was implemented based on the Ethereum. According to test results,the average time of information query response is around 2ms while the amount of on-chain data and querycount are 1GB and 1,000 times per second respectively.
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