Cypher is a non‑custodial privacy protocol operating on Ethereum Mainnet, designed to enhance transaction anonymity by using zero‑knowledge proofs (ZKPs) and an Association Set Provider (ASP) to break links between deposit and withdrawal addresses. Users can deposit fixed amounts of ETH into either public or verified pools—with 0.5% deposit fees—and withdraw anonymously without fees, relying on ZK-based smart contracts. The ASP layer ensures compliance by restricting access to verified users in certain pools while preserving privacy. The protocol runs in discrete phases, with each phase offering incentives—such as $CYPHER token rewards—for participants who maintain unspent deposits during the claim window.

Additionally, Cypher supports a suite of privacy‑focused tools like Cypher Bridge, VPN, Browser, Private Wallet, and Vault, enhancing user control over private transactions.