private Block CreateGenesisBlock()
{
    var lst = new List<Transaction>();
    var trx = new Transaction
    {
        Amount = 1000,
        Sender = "System",
        Recipient = "Genesis Account",
        Fee = 0.0001
    };
    lst.Add(trx);

    var trxByte = lst.ToArray().ConvertToByte();
    return new Block(1, String.Empty.ConvertToBytes(), lst.ToArray(), "Admin");
}