PIVX stands for Private Instant Verified Transaction. PIVX is an anonymity-based cryptocurrency created out of a fork of DASH. However, instead of using Proof-of-Work (PoW), it uses a custom Proof-of-Stake (PoS) system. This means that PIVX cannot be mined but you may earn a reward by staking it in your online wallet.
PIVX inherited all the technical features of DASH such as masternodes, instant send and private transfer. It has a block time of 60 seconds and has a fixed reward size per block that uses a custom Seesaw Algorithm that dynamically alters the reward split between masternode and staking nodes.