Gnosis (GNO), the native token of the Gnosis platform, is based on the Ethereum blockchain. The token is paired with other cryptos on several exchanges.
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).