# Confidential Assets * Xing Li, Yi Zheng, Kunxian Xia, Tongcheng Sun, and John Beyler. Phantom: An efficient privacy protocol using zk-snarks based on smart contracts. Cryptology ePrint Archive, Report 2020/156, 2020. . * Yi Zheng, Howard Ye, Patrick Dai, Tongcheng Sun, and Vladislav Gelfer. Confidential assets on mimblewimble. Cryptology ePrint Archive, Report 2019/1435, 2019. . --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://docs.qtum.info/qtum-documentation/research/confidential-assets.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.