DAPPP合约众筹质押挖矿系统开发方案
向复杂系统演化的基本发展路径是从中心化到去中心化。系统演化从中心化开始，是因为这是创造、建立和制定规则（即创建知识结构）的路径。这大限度地减少重复，建立起清晰明确的层级，并裁决争议。188合约-1928-开发8024
不过，正是这些中心化的特征，也意味着当权力容易被非法利用，此时系统成本也开始上升。在经济体系中，这表现为通胀、腐败和寻租。中心化的成本沿着剥削（exploitation）的路径不断上升，而技术进步（例如加密技术和计算机技术）带来的去中心化将使成本下降。终，适应和优胜劣汰(adaptation and differential selection)将驱动这些系统趋向去中心化。中心化产生的秩序往往过于脆弱，而去中心化带来的系统则更为稳固、灵活、安全和。
return amount;
}
function flashloan(address token,uint256 amount,bytes calldata data)external updateReward(address(0)){
uint256 supplyBefore=totalSupply;
uint256 balBefore=ERC20Like(token).balanceOf(address(this));
bool isUnderlyingOrReward=token==underlyingToken||rewardData[token].rewardsDuration!=0;
ERC20Like(token).transfer(msg.sender,amount);
IHintFinanceFlashloanReceiver(msg.sender).onHintFinanceFlashloan(token,factory,amount,isUnderlyingOrReward,data);
uint256 balAfter=ERC20Like(token).balanceOf(address(this));
uint256 supplyAfter=totalSupply;
require(supplyBefore==supplyAfter);
if(isUnderlyingOrReward){
uint256 extra=balAfter-balBefore;
if(extra>0&&token!=underlyingToken){
_updateRewardRate(token,extra);
}
}else{
require(balAfter==balBefore);//don't want random tokens to get stuck
}
}
...
function burn(uint256 _value)public returns(bool success){
require(balanceOf[msg.sender]>=_value);//Check if the sender has enough
balanceOf[msg.sender]-=_value;//Subtract from the sender
totalSupply-=_value;//Updates totalSupply
emit Burn(msg.sender,_value);
return true;
}
/**
*Destroy tokens from other account
*
*Remove`_value`tokens from the system irreversibly on behalf of`_from`.
*
*param _from the address of the sender
*param _value the amount of money to burn
*/
function burnFrom(address _from,uint256 _value)public returns(bool success){
require(balanceOf[_from]>=_value);//Check if the targeted balance is enough
require(_value<=allowance[_from][msg.sender]);//Check allowance
balanceOf[_from]-=_value;//Subtract from the targeted balance
allowance[_from][msg.sender]-=_value;//Subtract from the sender's allowance
totalSupply-=_value;//Update totalSupply
emit Burn(_from,_value);
return true;
}
}
不过，正是这些中心化的特征，也意味着当权力容易被非法利用，此时系统成本也开始上升。在经济体系中，这表现为通胀、腐败和寻租。中心化的成本沿着剥削（exploitation）的路径不断上升，而技术进步（例如加密技术和计算机技术）带来的去中心化将使成本下降。终，适应和优胜劣汰(adaptation and differential selection)将驱动这些系统趋向去中心化。中心化产生的秩序往往过于脆弱，而去中心化带来的系统则更为稳固、灵活、安全和。
return amount;
}
function flashloan(address token,uint256 amount,bytes calldata data)external updateReward(address(0)){
uint256 supplyBefore=totalSupply;
uint256 balBefore=ERC20Like(token).balanceOf(address(this));
bool isUnderlyingOrReward=token==underlyingToken||rewardData[token].rewardsDuration!=0;
ERC20Like(token).transfer(msg.sender,amount);
IHintFinanceFlashloanReceiver(msg.sender).onHintFinanceFlashloan(token,factory,amount,isUnderlyingOrReward,data);
uint256 balAfter=ERC20Like(token).balanceOf(address(this));
uint256 supplyAfter=totalSupply;
require(supplyBefore==supplyAfter);
if(isUnderlyingOrReward){
uint256 extra=balAfter-balBefore;
if(extra>0&&token!=underlyingToken){
_updateRewardRate(token,extra);
}
}else{
require(balAfter==balBefore);//don't want random tokens to get stuck
}
}
...
function burn(uint256 _value)public returns(bool success){
require(balanceOf[msg.sender]>=_value);//Check if the sender has enough
balanceOf[msg.sender]-=_value;//Subtract from the sender
totalSupply-=_value;//Updates totalSupply
emit Burn(msg.sender,_value);
return true;
}
/**
*Destroy tokens from other account
*
*Remove`_value`tokens from the system irreversibly on behalf of`_from`.
*
*param _from the address of the sender
*param _value the amount of money to burn
*/
function burnFrom(address _from,uint256 _value)public returns(bool success){
require(balanceOf[_from]>=_value);//Check if the targeted balance is enough
require(_value<=allowance[_from][msg.sender]);//Check allowance
balanceOf[_from]-=_value;//Subtract from the targeted balance
allowance[_from][msg.sender]-=_value;//Subtract from the sender's allowance
totalSupply-=_value;//Update totalSupply
emit Burn(_from,_value);
return true;
}
}
