Zcash is a privacy-focused cryptocurrency, launched in 2016 by the Zcash Company and founder Zooko Wilcox. Zcash relies on zk-SNARKs (zero-knowledge Succinct Non-interactive Argument of Knowledge) to prove that a valid transaction has occurred, without revealing the sender, recipient, or transaction amount. This affords users a greater level of privacy compared to a pseudonymous cryptocurrency such as Bitcoin, where transaction details are public. Users can selectively disclose transaction details to comply with AML or tax regulations. Zcash is the successor of Zerocash and Zerocoin, which were privacy-focused extensions of the Bitcoin blockchain. The Zcash blockchain is secured by the ASIC-resistant PoW algorithm Equihash. The total supply is 21 million ZEC, 10% of which accrues to early investors and developers within the first four years of the project.