3.ERC4626

ERC4626是一个vault，在DAI中，使用ETH换取DAI。其流程为先充值ETH到maker vault。

Vault

• 资产的管理、分红
• 用户充值某项资产获取某个凭证
• 该凭证作为分红、推出的依据
• Yield Farming/借贷/质押等

以太坊改进提案EIP:ethereum improvemwnt proposal
最初EIP-4626提出想法
4626代码,与最初标准还是有不同，ERC4626是继承ERC20
较好的4626代码分别是solmate和openzepplin

ERC4626

assets & shares

返回金库基础资产代币地址

function asset() external view returns(address assetTokenAddress);

返回金库管理的基础代币总额

function totalAssets() external view returns(uint256 totalManagedAssets);

需要注意的是，在ERC4626中规则中，一个vault只能管理一个代币

数量估计

function convertToShares(uint256 assets) external view returns(uinr256 shares);
function convertToAssets(uint256 shares) external view returns(uint256 assets);

充值资产，获取share

function maxDeposit(address receiver) external view returns(uint256 maxAssets);
function previewDeposit(uint256 assets) external view returns(uint256 shares);
function deposit(uint256 assers,address receiver) external returns(uint256 shares);
function maxMint(address receiver) external view returns(uint256 assets);
function mint(uint256 shares,address receiver) external returns(uint256 assets);

返回shares，拿回资产

function maxWithdraw(address owner) external view returns(uint256 maxAssets);
function previewWithdraw(uint256 assets) external view returns(uint256 shares);
function Withdraw(uint256 assets,address receiver,address owner) external returns(uint256 shares);
function maxRedeem(address owner) external view returns(uint256 maxShares);
function previewRedeem(uint256 shares) external returns(uint256 assets);
function Redeem(uint256 shares,address receiver,address owner) external retuens(uint256 assets);

总结如下：

两个事件

event Deposit(address indexed sender,address indexed owner,uint256 assets,uint256 shares);
event Withdraw(
	address indexed sender,
	address indexed receiver,
	address indexed owner,
	uint256 assets,
	uint256 shares
);

Front-Running

区块链交易在发布之后和正式上链之前，交易存在交易池中。矿空会根据优先级打包交易。
Front-running是指在金融交易中，某人或机构在知道客户即将进行大额交易的情况下，趁机在交易执行之前，以自己或自己所代表的利益进行相同或相似的交易。