CloakCoin (CLOAK) cryptocurrency was launched in 2014. It offers an anonymous payment option. You can buy this digital asset on a number of exchanges, including decentralized and instant exchanges, points of sales. It’s also possible to buy CLOAK for fiat (hard) currencies.
Zcash (ZEC) is a cryptocurrency with strong cryptography that is supposed to provide high security and privacy. At some point, Zcash was endorsed by Edward Snowden and Roger Ver. Zcash is a Bitcoin fork and it exists since 2016. The mechanism providing privacy is called zero-knowledge proofs (or zk-SNARKS).
SpankChain (SPANK) is an ERC-20 token offerd by the SpankChain network. The cryptocurrency pairs including SPANK are available on the number of exchanges. One can also buy the coin in exchange for USD currency, using one of the exchange platforms.