I've been mining PiCoin for a while now. It's a coin with a bit of a different approach. Instead of clockcycles, time is the thing that creates sparsity. Thus, it's eco friendly. It's still in beta mode, so you can't actually use the coins yet. I'm not sure if it will be hit or miss. So far, the market seems to have low expectations on PiCoin. But all it takes to mine is to push a button once a day, so why not?
You can read about the theory behind the currency here:
https://minepi.com/white-paper
If you sign up using this link:
Then both you and I get extra coins when we both are mining. Give it a go if you like!
