$ZEC
ZCash is a privacy-focused digital currency. It uses the Equihash algorithm, an asymmetric proof-of-work algorithm that is memory-intensive and based on the generalized birthday problem. Its high memory requirements hinder the creation of proofs and make ASIC development impossible.

ZCash uses zero-knowledge succinct non-interactive arguments of knowledge (zk-SNARKs) to ensure that all information (the sender, recipient, and amount) is encrypted, while preventing double spending. The only information revealed about the transaction is when it took place