31Third: BatchTrade Diff

Summary

31Third is a blockchain-based asset management infrastructure that optimizes on-chain trade execution and portfolio management. Its first product, batch trading, allows users to trade multiple assets or rebalance an entire portfolio in a single transaction, reducing costs, improving prices, saving time, and ensuring accurate portfolio weights. The team modified the `BatchTrade` contract to address `WEI` imprecisions during token transfers, providing more accurate amounts despite rounding issues. The code is well written with great documentation and a test suite with a code coverage higher than 95%. In this audit, we have not found any significant security vulnerabilities introduced by these changes. **Update**: The team resolved the issue and updated the test suite to reflect the fixes.