public Block(DateTime timeStamp, string previousHash, Valuation valuation)
{
Index = 0;
TimeStamp = timeStamp;
PreviousHash = previousHash;
Valuation = valuation;
}
public Block CreateGenesisBlock()
{
Teacher teacher = new Teacher("", "", null, "", "", "");
Valuation valuation = new Valuation(teacher, 0, "");
Block block = new Block(DateTime.Now, null, valuation);
return(block);
}