Abacus Chain will use Blockchain to change the personalized recommendation mode of traditional Internet, by acting as objective and yet independent role, optimize recommendation system to provide user the most relevant recommendation results ever. As a result, ads will be delivered to users in a more accurate and friendly way, users will also be benefited because of the convenient and interested news and merchandise.Based on the advantages of Blockchain, Abacus Chain will provide a completely secure and reliable way to store and access user behaviors.By using incognito and efficient sharing mechanism, different products can share users profiles. When using Abacus Chain product to analysis user behaviors and personalize recommendations, clients can get complete and accurate user profiles, thus can produce more accurate recommendation results. In the meantime, Abacus Chain will provide a both efficient and fair solution for ads alliance.All ads providers can monitor the efficient and payment of ads when using ads alliance. Abacus Chain will store all data in Blockchain, which can be accessed and analyzed by Abacus SDK. Data stored in BlockChain will be visible for all clients, leaving impossible for black box operation.