NIX (NIX)

Basics

According to CMC (10-2019):

"NIX Platform describes itself as a privacy currency and multi-layered interoperability platform that enables anonymity-focused decentralized applications (dApps) and smart contracts. It reportedly provides the option of adding a privacy layer to any blockchain. NIX is stake-able via LPoS(Leasing Proof of Stake) and supports Masternodes."

Zerocoin Protocol Vulnerability

Got a serious vulnerability back in 4-2019. It basically meant their protocol was broken and most projects utilizing Zerocoin stopped their private send functions afterwards. Projects affected were: ZCoin itself, PIVX, Veil, Gravity Coin, NavCoin (who was developing a Zerocoin variant called ZeroCT on their testnet) and NIX. On 19-4-2019 core developer Peter Shugalev found the root cause of the issue and confirmed that it was a failure in the cryptography of the Zerocoin protocol and that it affected all Zerocoin implementations. Forged coins were created, but not exceeding 1% of the circulating supply. The issue was not from a coding error, but from a cryptographic flaw in one of the proofs in the Zerocoin protocol that has existed since its inception.