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blockChain.cpp
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blockChain.cpp
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#include <QCoreApplication>
#include<QHash>
#include<QList>
class Block{
public:
Block(uint prevBlockSign,QString transactions){
m_prevBlockSign = prevBlockSign;
m_transactions = transactions;
m_signature = hash();
}
bool isEmpty()const{
return m_transactions.isEmpty() || m_transactions.isNull() || m_prevBlockSign==0;
}
uint prevBlockSignature(){ return m_prevBlockSign;}
QString transactions(){ return m_transactions; }
uint signature() const{ return m_signature;}
private:
uint m_prevBlockSign;
QString m_transactions;
uint m_signature;
uint hash(uint seed=0){
if(isEmpty()) return seed;
else{
QString data = m_transactions+QString::number(m_prevBlockSign);
return qHash(data);
}
}
};
QList<Block> generateBlockChain(const QString & genesisData){
QList<Block> blockChain;
Block genesisBlock = Block(1,genesisData);
Block lastBlock = genesisBlock;
blockChain.append(genesisBlock);
for( int index =0; index<100; index++){
Block block(lastBlock.signature(),QString::number(index)+" bitcoin");
lastBlock = block;
blockChain.append(block);
}
return blockChain;
}
void printSignature(QList<Block> & blockChain){
foreach(Block block,blockChain)
qDebug()<<block.signature();
}
void printSignature(QList<Block> & blockChain1 ,QList<Block> & blockChain2 ){
if(blockChain1.size()!=blockChain2.size())return;
for( int index =0 ;index<blockChain1.size() ; index++){
qDebug()<<"old sign "<<blockChain1.at(index).signature()
<<" new sign "<<blockChain2.at(index).signature();
}
}
int main(int argc, char *argv[])
{
QCoreApplication a(argc, argv);
QList<Block> blockChain1 = generateBlockChain("Ramesh sent 100 bitcoin");
QList<Block> blockChain2 = generateBlockChain("Ramesh sent 101 bitcoin");
printSignature(blockChain1,blockChain2);
return a.exec();
}