Vitalik Buterin recommends adopting features like "Transaction Simulation" to enhance the security and user experience of Ethereum wallets and smart contracts. The core ideas include: users first specify their on-chain intent, then review the transaction simulation results before clicking "OK" or "Cancel"; this can be combined with spending limits and multi-signature approvals to ensure that intent, expected outcome, and risk limits are consistent; the goal is to make low-risk operations easier and high-risk operations more difficult;

User intent definitions are extremely complex, and there is no perfect security solution. A good approach requires users to specify their intent through multiple overlapping methods, and the system only executes when there is consensus; security and user experience are both centered around user intent, applicable to wallets, smart contracts, operating systems, and hardware. (Cointelegraph)