DApp交易授权机制全景图

// 原生代币转账
async function sendETH(to, amount) {
    const tx = await signer.sendTransaction({
        to: to,
        value: ethers.parseEther(amount)
    });
    return tx.hash;
}

// Permit签名结构
struct Permit {
    address owner;
    address spender;
    uint256 value;
    uint256 nonce;
    uint256 deadline;
}

function permit(
    address owner, address spender,
    uint256 value, uint256 deadline,
    uint8 v, bytes32 r, bytes32 s
) external {
    require(block.timestamp <= deadline);
    // 验证签名...
    allowance[owner][spender] = value;
}