I read about a coin named stealthcoin that seems almost identical to signatum, but stealthcoin has a 20% yearly pos reward. Are they the same?
Stealthcoin looks like you would be buying high to me. Look at the price history for the coin, it has gone bonkers recently but it was almost worthless for years. I'm not sure how good it is for mining.
Right now looks like a time to buy low on SIGT but it is still a risk, it could go lower.