Recently, due to the development of network and the development of hardware, users can enjoy games anywhere, and as a result various games have been developed so that items in the game using cash and game cache have skyrocketed. The user (participant) uses his cash and game cache to estimate the probability and make the investment. However, there is a problem that the item does not come out even though the number of times of approaching the probability is reached. The reason is that developers can manipulate the probability information stored in the database, and the data of the probability game can be recorded uncertainly so that users can suffer damage. In this paper, we propose a reliable system based on a blockchain for a random item in a game. The developer marks the probability in the blockchain. The user can verify the information stored in the blockchain. Since the event that the user participates in is also stored in the blockchain, the user verifies/checks the information stored in the blockchain, thereby enhancing the reliability of the corresponding game.
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