Historically, various encryption technologies such as blind signature and group signature have been widely utilized. Under these circumstances, QURAS blockchain adopted zero-knowledge proof and ring signature as privacy technologies. With these developments, the expansion of use cases for blockchain can be expected. The two privacy technologies can be used for different purposes in accordance with the user’s needs. A zero-knowledge proof is suitable for shielding data, while ring signature is suitable for privacy protection within a group such as electronic voting, smart city, and smart grid. While utilizing the zero-knowledge proof, blockchain users can leverage the feature that can prove a group member’s signature without requiring the member to identify themselves. In addition, when using zero-knowledge proof and ring signature, adopting digital ID allows for compliance with laws/regulations and use cases in the real world. 
Originally, the blockchain platform had no administrators due to decentralization, however, by adding administrators to ring signature in the blockchain platform, it is made possible to handle centralized-type use cases. QURAS applies the idea of the common good in economics. Based on this idea, the system is established to distribute smart contracts’ transaction fees to projects that use the QURAS platform. Despite the violent fluctuation of the cryptocurrency market, QURAS lowers the risk of improper operation of projects and facilitates the timely completion of project schedules. The continuous support for those projects that use QURAS is provided on a protocol basis, which is believed to increase the overall value of QURAS in the end. In summary, QURAS’s philosophy is reflected in the system design which benefits the individual and the collective- all while pursuing what is good for the entire QURAS ecosystem or in other words, pursuing the common good.

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