public void gen_ledger(int key, byte[] val)
{
byte[] hash;
block_obj genesis;
hash = mySHA256.ComputeHash(val);
genesis = new block_obj(hash, key, val);
ledger.Add(genesis);
}
public void add_block(int key, byte[] val)
{
byte[] hash, current;
block_obj newBlock;
current = new byte[val.Length + ledger.Last().hash.Length];
hash = mySHA256.ComputeHash(current);
newBlock = new block_obj(hash, key, val);
ledger.Add(newBlock);
}