Is there a simple algorithm to understand ?
I do not understand what this code is trying to do, what does meet the target means.
No. That's not even the POW algo, just the loop that calls it and tests the result.
This is the algo:
var ScryptResult = Replicon.Cryptography.SCrypt.SCrypt.DeriveKey(Databyte, Databyte, 1024, 1, 1, 32);
If you don't know what the target means you have a very long way to go.