Aztec Labs Revives zk.money Privacy Wallet on Ethereum After Three-Year Hiatus

Key Highlights

• Aztec Labs has revived zk.money, a non-custodial privacy wallet that conceals transaction amounts, account balances, and payment recipients.
• The relaunched platform operates on Aztec Network, a privacy-centric Ethereum Layer 2 solution.
• Supported deposits include DAI, USDC, and USDT from Ethereum mainnet, with USDC and USDT automatically converting to DAI.
• Transaction caps are set at $2,500 per deposit, payment, or withdrawal, alongside a collective $50,000 daily deposit ceiling for all users.
• The initial zk.money platform debuted in 2021, ceased operations in 2023, and had facilitated transactions for more than 75,000 wallets.

Aztec Labs has resurrected zk.money, its privacy-preserving cryptocurrency wallet. After discontinuing the service three years ago, the platform has been revitalized on an upgraded infrastructure.

The platform enables users to conduct cryptocurrency transactions while keeping their account balances and payment records private. This contrasts sharply with standard Ethereum wallets, where blockchain explorers reveal complete transaction histories for any public address.

Privacy Mechanism Explained

The zk.money service operates through Aztec Network, an Ethereum-based Layer 2 solution. After assets are transferred to this network, transaction values, account holdings, and receiving parties become invisible on public blockchains.

The platform accepts deposits of DAI, USDC, and USDT stablecoins directly from Ethereum wallets. Upon entry, both USDC and USDT undergo automatic conversion to DAI, making it the exclusive currency within the zk.money ecosystem.

According to Aztec Labs, DAI was selected due to its position as the most decentralized stablecoin with significant market adoption. The company indicated that additional digital assets may become available in future updates.

A user-friendly naming system replaces complex wallet addresses, allowing transactions to be sent to readable identifiers such as bob.zk.money instead of lengthy hexadecimal strings.

This naming functionality leverages Ethereum Name Service infrastructure. Additionally, users maintain control over which parties can engage with their personalized handles.

Transparency Limitations

Complete privacy isn’t guaranteed for all transaction elements. According to Aztec’s technical documentation, deposits originating from Ethereum mainnet still expose both the sending address and the transferred amount.

Privacy protection applies only to recipients within the Aztec Network itself. Consequently, when funds exit a conventional Ethereum wallet, certain transaction details remain publicly viewable.

The relaunched service implements conservative restrictions initially. Individual deposits, payments, and withdrawals face a $2,500 maximum threshold.

A collective daily deposit cap of $50,000 applies across the entire user base, with this limit gradually replenishing. Aztec Labs attributes these constraints to the experimental nature of the underlying cryptographic systems.

Depositing funds carries a 35-cent fee plus standard Ethereum gas costs. Withdrawals incur a 20-cent charge, while users receive 100 complimentary internal transactions daily within the wallet.

The platform screens Ethereum addresses involved in deposits and withdrawals against international sanctions databases. A secure server assists in processing wallet operations, though it lacks authorization to unilaterally access user funds.

The first iteration of zk.money debuted in 2021 before being discontinued in 2023. Aztec Labs explained that the previous version faced scalability challenges that prevented worldwide expansion.

Aztec Labs CEO Joe Andrews clarified that the shutdown wasn’t demand-related. He explained that the intervening years were dedicated to constructing the foundational technology required to support privacy-preserving payments at massive scale.

This development effort resulted in Aztec Network, now governed by the independent Aztec Foundation. Aztec Labs continues developing applications, including zk.money, that utilize this underlying network.

Future roadmap items include connecting zk.money with various DeFi protocols on Ethereum, with integrations targeted for completion within the current year. A smartphone-compatible version is also scheduled for the same timeframe, though specific release dates remain unannounced.

In June, two legacy Aztec smart contracts associated with previously retired products experienced security breaches. Aztec emphasized that these contracts operated independently from the current network and that the new zk.money platform remained unaffected.

Aztec Labs has secured $125 million in total funding, including a substantial $100 million investment round in 2022 led by a16z crypto and Paradigm.