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ERC20 Infinite Approval: A Battle Between Convenience and Security. The author of the DeFi project has to authorize DeFi projects more than once. Users do not know the day when they suddenly find that their token has been transferred away. Multi-native tokens can achieve all functions of QKC, including cross-chain transfers. In future, the problem of infinite approval can be solved by using multi-native token tokens, such as QKC tokens, which have the same status as QChain.