XSPEC, or its offspring WISP
Mining a privacy coin is an oxymoron, because mining is much easier to censor/control/outlaw than staking
Just now Bitmain started KYCing customers and even with ASIC resistant coins, you cannot buy large quantities of graphics cards without getting noticed. Many countries are getting people in hot water now if they import mining equipment! Just google for yourself...not POS. Just an encrypted connection from your cheap old computer with lousy internet connection, is all it takes
Governments can easily fuck miners...but not stakers, especially if they stake via TOR
An attacker would have to BUY over 50% of a POS coin to break it - and that would certainly let its prices explode...with the tiny orderbooks these coins have
So I think POS privacy coins are the future.