Blockchain has a very good coupling with the vertical field of content.Using the characteristics and technology of blockchain,there are more and more platforms for content.The competition in this track is extremely fierce.As far as I know,there are many,such as foreign steelit,domestic coin,coin,Primas,iveryone,pressone,etc.

DApp运行原理

DApp底层区块链开发平台就好比手机的iOS和Android系统，是各种DApp的底层生态环境，DApp就是底层区块链平台生态上衍生的各种分布式应用，本文由V_StPv888整理发布.也是区块链世界中的基础服务提供方，DApp于区块链，就好比APP之于iOS和Android。

int calPagerank(区块链I8O合约2857系统8624開发)

{

cout<<nowTime()<<“:Begin calculate pagerank.”<<endl;

int oldIdx=0;

int newIdx=1;

int urlNum=urls.size();

for(int i=0;i<urlNum;i++)urls.score[oldIdx]=sum/urlNum;

for(int iteration=0;iteration<=10000;iteration++)

{

cout<<nowTime()<<“:iteration”<<iteration<<endl;

for(int i=0;i<urlNum;i++)

{

urls.score[newIdx]=0;

}

double perSum=0;

for(int i=0;i<urlNum;i++)

{

urls.score[newIdx]=sum*rem/urlNum;

if(urls.inDegree>0)

{

for(vector::iterator iter=urls.refList.begin();iter!=urls.refList.end();iter++)

{

int id=*iter;

urls.score[newIdx]+=(1-rem)*urls[id].score[oldIdx]/urls[id].outDegree;

}

}

perSum+=urls.score[newIdx];

}

for(int i=0;i<urlNum;i++)

{

urls.score[newIdx]=urls.score[newIdx]/perSum;

}

double dif=0;

for(int i=0;i<urlNum;i++)

{

dif+=abs(urls.score[newIdx]-urls.score[oldIdx]);

}

if(dif<bound)

{

break;

}

oldIdx=newIdx;

newIdx=1-oldIdx;

}

cout<<nowTime()<<“:Complete calculate pagerank.”<<endl;

return newIdx;

}

什么是智能合约？

如果把区块链看做是一个数据库，数据源，

智能合约基本上就是一段数据库操作脚本，

它决定了你如何在区块链上存储数据，修改数据。

void initUrl()

{

cout<<nowTime()<<“Begin init user.”<<endl;

ifstream in(mapPath.c_str());

string urlStr;

int id=0;

while(in>>urlStr)

{

if(urlStr.substr(urlStr.size()-4)“.css”||urlStr.substr(urlStr.size()-3)“.js”)

continue;

if(urlId.find(urlStr)==urlId.end())