Zcash zec

Zcash is a decentralized digital currency designed to let people send value with an optional privacy layer. Its native asset is ZEC. Unlike a ledger where every payment amount and address is public, Zcash supports shielded transactions whose sensitive details can be encrypted while network nodes still verify that the transaction follows the monetary and consensus rules. It also retains transparent addresses and transactions for compatibility with services that need public auditability.

The project grew out of the Zerocash research protocol and launched in October 2016. Its main technical distinction is the use of zero-knowledge proofs, especially zk-SNARKs, to prove that a shielded payment is valid without revealing the sender, recipient, or amount to the public blockchain. Privacy is a user-selectable property: a transaction using transparent addresses exposes information, and even shielded use can be weakened by wallet, exchange, network, or operational metadata.

Zcash addresses the loss of financial privacy in conventional public blockchains. On a fully transparent chain, observers can often connect addresses, amounts, balances, and payment histories, allowing anyone to inspect a user's finances, infer relationships, or use transaction history for profiling. Zcash aims to preserve the auditability and double-spend protection of a public blockchain while allowing users to keep payment details confidential.

It also addresses the practical tension between privacy and interoperability. Transparent addresses remain available when a user or service needs public visibility, while shielded pools provide confidentiality for users who choose them. This is a design trade-off rather than a promise that every Zcash payment is automatically anonymous: privacy depends on using shielded addresses end-to-end and avoiding information leaks outside the cryptographic transaction itself.

Zcash transactions can use transparent or shielded pools. Transparent addresses and transactions work similarly to Bitcoin-style public payments: addresses, values, and transaction history are visible on the public chain. Shielded transactions use commitments, encrypted note data, nullifiers, and zero-knowledge proofs. A sender proves knowledge of a valid spend, proves that the note has not already been spent, and proves that value is conserved, without publishing the transaction's sensitive details. Nodes verify the proof and consensus rules without learning the hidden sender, recipient, or amount.

The original Sprout and later Sapling protocols used zk-SNARK constructions with multi-party parameter-generation ceremonies. The Orchard shielded protocol, introduced with Network Upgrade 5 in May 2022, uses the Halo 2 proving system and removes the need for a trusted setup for Orchard. Unified Addresses can package multiple receiver types so wallets can offer a simpler address while preferring shielded capability where supported. Zcash uses proof of work with the Equihash algorithm to order blocks and secure consensus; ZEC pays transaction fees and is the asset transferred through transparent and shielded pools.