I've seen that paper from the Monero subreddit, its sort of served us as a reference point recently and is similar to what we are planning to implement.
Hello!
I'm very interested in this project.
How work donation system? How much coins we earn donating $100 for example?
Our current donation rates are 1 BTC = 1,650,000 MANTA, and 1 XRB = 3150 MANTA.
So $100 would be about ~10000 MANTA