Authors: Huaqun Wang, Debiao He, Kim-Kwang Raymond Choo, Xi Chen

Title: PPChain: Blockchain-Based Multi-Party Proof of Assets with Privacy Preservation

Journal: Information Sciences
 

Abstract: There are a number of requirements associated with cryptocurrency transactions, such as preserving the privacy in proof of assets for multiple parties. Specifically, multi-party proof of assets assures one that a large number of guarantors control sufficient assets that satisfy the lender’s predefined value. It has many applications in credit guarantee transactions. However, preserving the privacy in multi-party proof of assets for cryptocurrency transaction remains challenging. This paper introduces a novel concept of privacy-preserving multi-party proof of assets for cryptocurrency transactions, where the proof process does not disclose their cryptocurrency addresses and individual holding. We formalize both the system model and the security model, and present a concrete protocol. Finally, we show that the proposed protocol is provably secure and efficient.