近日，中国科学院大学密码学院在加密货币隐私保护与合规监管领域取得研究进展。由密码学院博士研究生张译尹作为第一作者完成的论文《Privacy-Preserving Transaction Admission with Warrant-Based Trace Recovery for Regulated Cryptocurrency Transactions》发表于期刊 Electronics。该研究面向需要合规监管的加密货币交易场景，针对交易验证过程中可能暴露用户身份关联信息的问题，提出了一种兼顾隐私保护与授权追踪的交易验证框架，使用户能够在不公开身份等敏感信息的情况下证明交易满足相关要求，并在获得合法授权后针对特定交易恢复相应身份信息。
Abstract：Public blockchain transactions need compliance support without exposing stable identity anchors. This paper presents a privacy-preserving transaction admission framework for regulated cryptocurrency transaction paths. It adds an admission and recovery layer to admission-aware applications, contracts, gateways, or chain policies without introducing a new cryptocurrency. In ordinary use, a user submits a public transaction object and a single Groth16 admission proof, which checks registration membership, current state, hidden home-domain membership, hidden home-domain policy compliance, transaction binding, replay control, and trace-object well-formedness while hiding identity-related witnesses. When a valid warrant targets an accepted transaction, recovery committees perform transaction-scoped trace recovery through outer opening and domain-local inner recovery. We implement an end-to-end prototype with off-chain modules and an Ethereum Virtual Machine (EVM)-compatible public admission contract. The evaluation reports a 28,370-constraint circuit, 3.40 s average proving time, about 536k local EVM admission gas, 30/30 replay rejection, 8.46 ms local layered recovery latency, and 3.84 ms domain-dispatch latency.
论文信息：Yiyin Zhang, Jiwu Jing, Yuewu Wang, Chunjing Kou: “Privacy-Preserving Transaction Admission with Warrant-Based Trace Recovery for Regulated Cryptocurrency Transactions,” Electronics, 2026, 15, 2990.
