Zcash is a decentralized and open-source cryptocurrency that offers privacy and selective transparency of transactions. Zcash payments are published on a public blockchain, but the sender, recipient, and amount of a transaction remain private.
Zcash is based on peer-reviewed cryptographic research, and built by a security-specialized engineering team on an open source platform based on Bitcoin Core’s battle-tested codebase. Our improvement over Bitcoin is the addition of privacy. Zcash uses advanced cryptographic techniques, namely zero-knowledge proofs, to guarantee the validity of transactions without revealing additional information about them.
Our zero-knowledge proving scheme makes it possible to conceal values and other identifying information from the public blockchain. Users simply prove that the values balance out and that they are not double-spending the amount they want to send.
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HOW IT WORKS
Zcash encrypts the contents of shielded transactions. Since the payment information is encrypted, the protocol uses a novel cryptographic method to verify their validity.
Zcash uses a zero-knowledge proof construction called a zk-SNARK, developed by our team of experienced cryptographers based on recent breakthroughs in cryptography. These constructions allow the network to maintain a secure ledger of balances without disclosing the parties or amounts involved. Instead of publicly demonstrating spend-authority and transaction values, the transaction metadata is encrypted and zk-SNARKs are used to prove that nobody is cheating or stealing.
Zcash also enables users to send public payments which work similarly to Bitcoin. With the support for both shielded and transparent addresses, users can choose to send Zcash privately or publicly. Zcash payments sent from a shielded address to a transparent address reveal the received balance, while payments from a transparent address to a shielded address protect the receiving value.
To learn more about the secure setup involved in Zcash’s zero-knowledge proving scheme for private payments, visit our parameter generation page.
In order to remain equally interchangeable, units of cryptocurrency must be unlinked from their history so that one unit is as good as any other unit. Zcash brings fungibility to cryptocurrency by unlinking shielded coins from their history on the blockchain.
ENABLING NEW APPLICATIONS
Zcash is pioneering the use of zero-knowledge proofs, applying cutting-edge cryptography to blockchain technology. Zero-knowledge proofs allow fully encrypted transactions to be confirmed as valid. This new property will enable entire new classes of blockchain applications to be built.
In the pre-digital currency world, both individuals and enterprises could justifibly assume that their financial transactions would be kept confidential. With Zcash, users can enjoy the advantages of using a public blockchain, while still being sure that their private information is protected.