Aztec launches v5 alpha with 50% cheaper private Ethereum transactions

Aztec has rolled out its v5 Execution Layer Alpha, a governance-approved onchain upgrade aimed at making private Ethereum transactions faster, cheaper and more practical on everyday hardware. The project says a private token transfer now takes about 2.5 seconds to prove natively on a consumer laptop, down from 5.2 seconds in v4, while browser-based proving takes around 6.8 seconds. It also says the cost of fully private transactions has been cut by roughly 50% through lower proving overhead and adjusted mana parameters. The release deepens Aztec’s push into client-side zero-knowledge proving, where private computations run in a user’s Private Execution Environment and only verifiable proofs are submitted to the network. Aztec says the v5 alpha includes about 2x faster ECDSA signature verification, roughly 3x faster Poseidon2 hashing, around 50% lower protocol circuit gate counts, and average block production times reduced from 14 seconds to six seconds. Architectural changes such as pipelined block building, optimistic proving and a redesigned checkpoint system are intended to improve throughput, stability and user-perceived latency while keeping sensitive data local. The upgrade also expands developer tooling around Noir and refreshes node APIs and RPC methods, with new support for fee prediction and membership witness queries. Aztec says the release resolves critical issues identified in v4, activates real slashing conditions and improves operator workflows. Earlier launch materials said usable apps would begin rolling out with Nyx, a wallet for private transfers on Ethereum and private yield on Aave, while Aztec has continued to frame v5 as a step toward mainstream privacy-preserving applications across laptops and mobile devices. The broader strategy still includes Aztec’s hybrid public-private state model, selective disclosure tools and identity-related work following its May 2026 acquisition of ZKPassport. The company has not published a reproducible benchmark for all of its performance and fee claims, and several of the latest metrics remain project-reported. Still, the new figures add detail to Aztec’s argument that private smart contracts can move closer to public-chain responsiveness without shifting sensitive computation to centralized servers.