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Supply chain product traceability of blockchain

Time : 16/09/2021 Author : lpnaze Click : + -
        Traceability is to track and record the circulation chain of tangible goods (logistics) and intangible information (information flow). It is mainly used in three categories of supply chains: food products (meat, vegetables, fruits, aquatic products, baby milk powder, Chinese herbal medicines, etc.), high-end consumer goods (precious tobacco and wine, etc.) and high-end art (cultural relics, jewelry, etc.). The combination of the Internet of things, the Internet and the supply chain scenario is used to obtain various kinds of information and data from the trading network in real time or in time. Through the registration of each circulation, the traceability of origin and anti-counterfeiting authentication are realized. The Internet of things is responsible for collecting all kinds of multi-agent data and uploading it through the hash algorithm. By using the technical characteristics of the blockchain, the data can be tampered with and traceable.
        At the same time, it relies on the relevant verification of multi-dimensional data to reduce the process friction caused by information asymmetry, such as the matching of purchase data and logistics data, the verification of inventory data and sales data, and the verification of core enterprise data and upstream and downstream chain data. For example, everledger, established in London in 2015, is a tracking and identification platform for registering jewelry identity and recording jewelry circulation process. Everledger's business starts with diamonds. Since no two diamonds are identical, they cooperate with diamond appraisal institutions to generate an independent "digital number" for each diamond by measuring the data of 40 points on the finished diamond, and chain this "digital number" to record the circulation of all diamonds.
        Everledger's main customers are insurance companies that undertake diamond theft and rescue, and insurance companies use everledger's data mainly to solve the problem of insurance fraud. Once the diamond is reported stolen, the relevant personnel will mark the diamond as "stolen" on the chain, and the diamond will no longer be able to circulate, insure, mortgage, etc. at the same time, it also provides convenience for law enforcement agencies to trace the diamond. Take the manufacturing supply chain as an example to talk about the specific implementation methods. The raw material supplier extracts several characteristic data of raw materials through cooperation with the appraisal organization, and generates an independent digital number for each raw material. The finished product manufacturer takes the number of various raw materials used as input, and selects a hash algorithm with sufficient collision resistance and privacy to calculate a specific hash value for each finished product.
        This extraction and generation method can be automatically extracted and generated by technologies such as RFID, sensors and single chip application processors of the Internet of things (such as edible products), or NFC chips with unique codes can be implanted in the finished products (such as precious tobacco and wine, luggage and luxury jewelry), or it can be calculated and generated by measuring the characteristics of the articles (such as cultural relics and jewelry). With the circulation of the finished product between various links of the supply chain, the blockchain system records the hash value in the circulation process through transactions and links it to the chain, which we call data records. The data record is the data record information that cannot be tampered within a certain period of time contained in the block. The data storage structure is as follows:.
        The data structure contains the data record, the current block root hash, the previous block root hash, the timestamp, and other information. Data records may include Internet of things data records, circulation records, payment records, transaction records and clearing records. In the storage process, it is usually organized in the form of a tree, such as a Merkel tree, and the block root hash is calculated by the hash algorithm from the bottom to the top according to the data records. The timestamp is generated when the block is created and is the time when the block is generated. Each block also records the root hash pointer of the previous block, so that it can be linked from front to back. To sum up, the Internet of things technology is used to ensure the accuracy and uniqueness of the information data source, and the blockchain technology is used to record the flow process of the hash value of the product in the logistics of logistics suppliers and consumers. The two together constitute a whole chain traceability system with authentic information, no tampering, traceable source, traceable destination and traceable responsibility.
        One of the core objectives of a smart city is to realize the smart transportation of the city, and the realization of smart transportation requires the digital upgrading of vehicles. A few years ago, there was a new term in the Internet of things industry & mdash& mdash; Automobile electronic identification (commonly known as electronic license plate) is a new technical means to realize vehicle data informatization. As the foundation of intelligent transportation construction, the promotion and popularization of automobile electronic signs is imminent. Recently, Zeng liedan, deputy general manager of Shenzhen Aerospace Huatuo Technology Co., Ltd. (hereinafter referred to as "aerospace Huatuo"), accepted an exclusive interview with the reporter of RFID world network and talked about some ideas on the promotion of automobile electronic identification.
        Computer technology, communication technology and sensor technology are the three supporting technologies of the Internet of things industry. These three technologies were not born in the Internet of things era, but existing technologies that have been used since the Internet era.
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