Paper 2023/1816

ASOZ: a decentralized payment system with privacy preserving and auditing on public blockchain

Tianjian Liu, Beijing Jiaotong University
Dawei Zhang, Beijing Jiaotong University
Wei Wang, Beijing Jiaotong University
Chang Chen, Beijing Jiaotong University

Decentralized payment systems have gradually received more attention in recent years. By removing the trusted intermediary used for accounting ledgers, those payment systems fundamentally empower users to control their assets. As privacy concerns grow, some cryptocurrencies are proposed to preserve the privacy of users. However, those cryptocurrencies also inadvertently facilitate illicit activities such as money laundering, fraudulent trading, etc. So it is necessary to design an auditing scheme. To solve this problem, many privacy-preserving and auditing schemes have been proposed. However, there exists no scheme that effectively solves the issue of privacy-preserving and auditing on both user identity and transaction value. In this paper, we propose a design for a decentralized payment system named ASOZ. We use cryptographic accumulators based on Merkle trees for accounting and use a combination of Twisted ElGamal, Non-Interactive Zero-Knowledge(NIZK), Bulletproofs, and zk-SNARKs for privacy-preserving and auditing. Our scheme achieves full transaction audit in global mixing, while the additional cost introduced remains within an acceptable range, specifically an 8% increment in proof generation time and a 23% rise in verification time. Our scheme is capable of handling large-scale transaction scenarios such as designated contract markets, and offers the strongest privacy protection capabilities in coin mixer schemes.

Available format(s)
Public-key cryptography
Publication info
blockchaincryptocurrenciesdecentralized payment systemprivacy-preservingauditiablezero-knowledge proof
Contact author(s)
tianjian liu @ bjtu edu cn
dwzhang @ bjtu edu cn
wangwei1 @ bjtu edu cn
chang chen @ bjtu edu cn
2024-05-11: last of 2 revisions
2023-11-24: received
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      author = {Tianjian Liu and Dawei Zhang and Wei Wang and Chang Chen},
      title = {{ASOZ}: a decentralized payment system with privacy preserving and auditing on public blockchain},
      howpublished = {Cryptology ePrint Archive, Paper 2023/1816},
      year = {2023},
      note = {\url{}},
      url = {}
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