PIVX is a cryptocurrency aiming at anonymity. It uses an algorithm called Quark. In the past, this cryptocurrency used proof-of-work algorithm, but 180 days after the first unit has been mined, it switched to proof-of-stake algorithm.
60 000 pre-mined units have been destroyed because of this switch. Since it is an outcome of the split of the Dash site, it has very similar means of valorisation, where the user holds a certain amount on their wallet connected to the site, which helps to stabilize it.
For anonymity preservation, PIVX uses the same protocol as Zcash, the Zero-knowledge. This protocol enables units to be distributed in site, without the need to keep history. The site is also set up to confirm transactions quickly. It only takes about 60 seconds for the transaction to be confirmed after it is added.