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Carry protocol is an offline retail data platform based on blockchain, which provides consumers with 1) compensation for their own data sharing and 2) CRE tokens with rewards obtained by receiving advertising information. Carry protocol not only gives consumers the ownership and control over their own consumption data, so that consumers can benefit by actively selling their own data, but also helps businesses better understand consumers through data. At the same time, based on these data, it provides advertisers with more accurate and detailed advertising target information (such as the goods or services exactly purchased by consumers, purchase frequency, location, etc.), so that advertisers can accurately locate and send the target group, and finally build a win-win ecosystem for consumers, businesses and advertisers.