Hush

Hush aims to allow users to speak and transact freely. It describes itself as a private cryptocurrency and messenger on Zero Knowledge Proof Encryption. Hush is an implementation of the Zerocash protocol, offering privacy-preserving confidentiality of transaction metadata. Hush's codebase is based on Komodo and Zcash 2.0.x. According to the team, the latest version of Hush with Komodo Delayed Proof-of-Work (dPOW) provides security from 51% /double spend attacks. Hush is reportedly one of the first blockchains to enforce only Sapling transactions from the beginning.

More information can be found at https://hush.is/.