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Most cloud providers use centralized servers to manage data. However, centralized servers still suffer the risks of single point of failure and data theft. We add a blockchain to the cloud service and propose a new architecture to manage data. Using blockchain as a connector to utilize the tamperproof, traceable, and data-sharing features of the blockchain to ensure that the transaction data are properly stored in each node. We use the stock simulation trading service to extend and divide thedoi:10.15439/2019f296 dblp:conf/fedcsis/TsengCK19 fatcat:gdo45q3c75b5zaqz6bl4egvn6a