Zcash is a cryptocurrency designed to enable private transactions on a public blockchain. It achieves this by allowing transactions to be verified without revealing sensitive information such as the sender, receiver, or transaction amount.
This page explains how Zcash works at a practical level, from transaction creation to network validation, without going deep into cryptographic mathematics.
Zcash operates on a public blockchain similar to Bitcoin. Blocks are produced by miners using proof of work, and the blockchain records the history of all transactions.
The key difference is what information is visible on that blockchain.
Zcash supports both transparent and shielded transaction types, giving users control over how much information is revealed.
Zcash has two types of addresses:
Transparent transactions work similarly to Bitcoin. The sender, receiver, and transaction amount are visible on-chain and can be inspected by anyone.
These transactions exist to maintain compatibility with exchanges and other infrastructure.
Shielded transactions hide all sensitive information. When a transaction is shielded:
The blockchain records only a cryptographic proof that the transaction is valid.
Zcash uses zero-knowledge proofs, known as zk-SNARKs, to verify transactions.
These proofs allow the network to confirm that:
All of this happens without revealing any transaction details to the public blockchain.
In a shielded transaction:
This separation is what allows Zcash to maintain both privacy and security at the same time.
Instead of visible balances, Zcash uses encrypted records sometimes referred to as “notes.”
Each note:
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When a note is spent, the network verifies that it has not been spent before, without revealing its history.
Zcash supports selective disclosure, allowing users to share transaction details when required.
Users can:
This makes Zcash usable in both personal and regulated contexts.
Zcash uses proof of work mining, similar to Bitcoin.
Miners:
Privacy features do not change how consensus works. They only change what data is revealed on-chain.
Zcash transaction fees are generally low and predictable. Shielded transactions are more computationally complex than transparent ones, but network upgrades have significantly improved performance and usability over time.
While both networks share similar foundations, they differ in transaction visibility.
Bitcoin transactions are fully transparent. Zcash transactions can be private or transparent, depending on how they are created.
This flexibility allows Zcash to serve use cases that Bitcoin cannot without external tools.
Zcash was designed to solve a specific problem: public blockchains permanently expose financial data.
Once transaction data is public, it cannot be undone. Zcash gives users the option to protect that data while still benefiting from a secure public blockchain.
