Proof-of-stake earnings depend on current PoS difficulty and the amount of coins you have locked for staking. The more coins you stake, the better chance you have to “win” the right to sign next PoS block. Of course, it’s important to be able to estimate your chances and predict in some way how much can you earn. Here is the most simple way to do so.

First, we need to get current PoS difficulty, which can be found in the block explorer. This value then divides by 1000000000000 (10 ^ 12), which in Zano network is one coin basis.

Second, we again divide it by 100. This operation lets us take PoS mining timestamp frame into account. Without getting into further details, this factor provides hash variety in PoS mining and can be somewhere between 80 and 160. It’s reasonable to simply use value of 100 here.

Now we have an estimation of how many coins participate in PoS mining currently.

Coins in PoS = PoS difficulty / 1000000000000 / 100

As you may know Zano network emits an average of 1 coin each minute with 50-50 spread between PoS and PoW. That makes it 720 potential PoS reward coins per day. So if you owned all the coins in PoS that could be your total day earnings. And if you divide coins in PoS by 720 you will get a number of coins you need mine 1 Zano coin a day. In other words,

PoS earnings = your staking coins * 720 / coins in PoS

Please keep in mind that all the above is an expectation and can heavily vary.