Volume 11, Number 14, September 2021

DMC: Decentralized Mixer with Channel for Transaction Privacy Protection on Ethereum

  Authors

Su Liu and Jian Wang, Nanjing University of Aeronautics and Astronautics, China

  Abstract

Ethereum is a public blockchain platform with smart contract. However, it has transaction privacy issues due to the openness of the underlying ledger. Decentralized mixing schemes are presented to hide transaction relationship and transferred amount, but suffer from high transaction cost and long transaction latency. To overcome the two challenges, we propose the idea of batch accounting, adopting batch processing at the time of accounting. For further realization, we introduce payment channel technology into decentralized mixer. Since intermediate transactions between two parties do not need network consensus, our scheme can reduce both transaction cost and transaction latency. Moreover, we provide informal definitions and proofs of our scheme's security. Finally, our scheme is implemented based on zk-SNARKs and Ganache, and experimental results show that the higher number of transactions in batch, the better our scheme performs.

  Keywords

Ethereum, transaction privacy, decentralized coin mixer, payment channel, zero-knowledge proof.