BMSC: A Novel Anonymous Trading Scheme Based on Zero-Knowledge Proof in Ethereum.

Blockchains are widely used because of their openness, transparency, nontampering and decentralization. However, there is a high risk of information leakage when trading on blockchain, and the existing anonymous trading schemes still have some problems. To meet the high requirement of anonymity, the cost of proof submitted by the user is too large, which does not apply to blockchain storage. Meanwhile, transaction verification takes too long to ensure the legitimacy of the transaction. To solve these problems, this paper presents a novel anonymous trading scheme named Block Maze Smart Contract (BMSC) based on the zero-knowledge proof system zk-SNARKs to propose efficiency. This scheme can hide account balances, transaction amounts, and the transfer relationships between transaction parties while preventing overspending attacks and double-spending attacks. Compared with other anonymous schemes, this scheme has less cost of proof and takes less time for transaction verification while meeting the high requirements of anonymity and security.