During the first decade of this century, the online games are developed rapidly in China. But the virtual items transaction problems hinder the development of online games. Traditional trading models cannot meet the demand of both security and convenience at the same time. In order to improve the traditional transaction models, this paper presents a more secure transaction platform by embedding a trading NPC (Non Player Character) inside the online game. Using this method, all transaction processes will be finished automatically. Our novel mechanism is more secure than previous models.
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