Aztec launches Alpha V5 with 2x faster private transactions on Ethereum

Aztec Network launched Alpha V5 on mainnet Tuesday, delivering 2x faster private transactions and 50% lower costs on its Ethereum Layer 2.

"Alpha V5 is the fastest private transactions we've ever shipped," the Aztec team said in the announcement, adding that the release resolves critical issues from V4 after testing by more than 234 researchers through the Cantina bug bounty program.

The upgrade proves a fully private transaction in about 2.5 seconds on a consumer laptop and cuts fees to under $0.05, according to Aztec's published metrics. Proving happens on the user's own device rather than a remote server, preserving privacy throughout the process. The figures represent a 2x improvement in proving speed and a 50% reduction in cost versus V4, though Aztec has not published independent benchmarks.

The release positions Aztec as the first Ethereum L2 with a full private execution environment on mainnet, extending blockchain privacy beyond simple payments into smart contract interactions. Usable apps begin rolling out this week starting with Nyx, a wallet that connects existing Ethereum wallets for private transfers and private yield on Aave. Nyx is normally invite-only but is open to everyone for 24 hours.

The proving speed improvement is central to Aztec's design because proofs are generated client-side rather than handed to a server that would see the transaction data. Alpha V5's client-side proving architecture means users maintain full control over their private data throughout the transaction lifecycle.

Aztec's Alpha V5 follows the network's earlier alpha launch and public testnet, moving performance and cost claims from testing environments onto mainnet. The company said more apps beyond Nyx are "rolling out VERY soon."

The privacy L2 space has seen renewed activity this month. Ethereum co-founder Vitalik Buterin recently unveiled a privacy demo built on Aztec's technology, demonstrating an anonymous billboard with moderation features powered by zero-knowledge proofs. Separately, Zcash developers launched Zakura, a new full node targeting Visa-scale throughput of 50,000 transactions per second, signaling broader industry momentum around scalable privacy infrastructure.

Aztec's cost reduction to under $0.05 per transaction makes private DeFi more accessible, potentially attracting users who previously found privacy features too expensive for routine use. The network's ability to support private smart contracts differentiates it from earlier privacy solutions that focused primarily on payments.

This article is for informational purposes only and does not constitute investment advice.