Zcash is a cryptocurrency that grew out of the Zerocoin project, aimed at improving anonymity for Bitcoin users. The Zerocoin protocol was initially improved and transformed into Zerocash, which thus yielded the Zcash cryptocurrency in 2016.
Zcash payments are published on a public blockchain, but users are able to use an optional privacy feature to conceal the sender, recipient, and amount being transacted. Like Bitcoin, Zcash has a fixed total supply of 21 million units.
Block explorer: https://explorer.zcha.in/