public Block Mine(string identifier)
{
Block lastBlock = Blockchain.GetLastBlock();
Int64 proofOfWork = Blockchain.GetProofOfWork(lastBlock.ProofOfWork);
Blockchain.AddNewTransaction(new byte[0], Util.Hash.HashString(identifier), 1);
return(Blockchain.AddNewBlock(proofOfWork, Util.Hash.HashBlock(lastBlock)));
}