币安BSC智能链发币教程——质押挖矿，质押母币挖矿子币模式【pdf+视频BSC发币教程下载】

质押挖矿是继流动性后挖矿后由各大DEX推出的新的挖矿模式，即质押母币挖矿子币。项目大致流程如下：前期先发行母币，随着母币的生态建设逐步完善，打通其在多个场景的应用落地。母币真正流通后，通证质押池，用户质押部分母币到质押池来获取子币，从而，实现子币的逐步流通，具体过程如下。

1、前期发行母币通证，为母币寻找合适的应用落地场景，完善生态建设

2、发行子币，设置子币的获取方式只能是通过母币质押获得

3、通过合约控制质押挖矿的业务逻辑，通过dapp与用户实现业务层面的交互。

质押合约主要包含的元素属性：母币合约地址、子币合约地址、质押周期，母币年收益率、子币年收益率，子母币的兑换比例、最少质押数量等。

质押合约的核心代码如下：

function stake(uint256 i) external nonReentrant {

        require(i < ledger[msg.sender].length, "Invalid index");
        require(ledger[msg.sender][i].ended==false, "Invalid stake");
        
        // penalization
        if(block.timestamp.sub(ledger[msg.sender][i].from) < maturity) {

            uint256 _penalization = ledger[msg.sender][i].amount.mul(penalization).div(100);
            asset.transfer(msg.sender, ledger[msg.sender][i].amount.sub(_penalization));
            asset.transfer(getOwner(), _penalization);
            ledger[msg.sender][i].penalization = _penalization;
            ledger[msg.sender][i].ended = true;
            emit StakeEnd(msg.sender, ledger[msg.sender][i].amount, _penalization, 0, i);

        // interest gained
        } else {
            
            // interest is calculated in asset2
            uint256 _interest = get_gains(msg.sender, i);

            // check that the owner can pay interest before trying to pay, token 1
            if (_interest>0 && asset.allowance(getOwner(), address(this)) >= _interest && asset.balanceOf(getOwner()) >= _interest) {
                //transfer logical
            } else {
                _interest = 0;
            }

            // interest is calculated in asset2
            uint256 _interest2 = get_gains2(msg.sender, i);

            // check that the owner can pay interest before trying to pay, token 1
            if (_interest2>0 && asset2.allowance(getOwner(), address(this)) >= _interest2 && asset2.balanceOf(getOwner()) >= _interest2) {
                //asset2.transfer.logical
            } else {
                _interest2 = 0;
            }

            // the original asset is returned to the investor
            asset.transfer(msg.sender, ledger[msg.sender][i].amount);
            ledger[msg.sender][i].to = block.timestamp;
            ledger[msg.sender][i].ended = true;
            emit StakeEnd(msg.sender, ledger[msg.sender][i].amount, 0, _interest, i);

        }
    }

前台用户操作页面提供质押合约owner的approve授权到质押合约的转账数量。合约owner可以直接授权母币质押额度。用户可以通过stake功能，设置质押母币数量，根据合约的规则挖矿子币。

至此，完成币安BSC智能链质押挖矿，质押母币挖矿子币模式合约代码。

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