Starknet launches Shieldnet privacy layer as DeFi loses $600 million to exploits

Starknet, the Ethereum Layer-2 scaling protocol, on June 3 launched Shieldnet, a privacy layer enabling confidential transactions within DeFi applications on its network.

The launch follows a wave of DeFi exploits that have drained more than $600 million from protocols in 2026, according to data from DefiLlama and Chainalysis. Flash loan attacks — which let borrowers manipulate markets and repay within a single transaction — have been a primary vector, with Thorchain losing $10.8 million in May and Radiant Capital shutting down after a $50 million hack in October 2024.

Shieldnet uses zero-knowledge proofs to obscure transaction details while maintaining verifiability on Starknet's Ethereum Layer-2 infrastructure. The privacy layer allows users to execute trades, provide liquidity, and interact with DeFi protocols without exposing wallet balances or transaction history to the public ledger, according to the project's announcement.

The feature could give Starknet a competitive edge in attracting capital from institutions that require transaction confidentiality, a segment that has largely remained on the sidelines of DeFi. Starknet's total value locked was not immediately disclosed following the announcement.

Privacy as a Competitive Differentiator

Starknet joins a growing list of Ethereum Layer-2 networks competing for DeFi market share as total value locked across all chains approaches previous cycle highs. Unlike competitors focused primarily on throughput or cost reduction, Shieldnet targets a different bottleneck: the public nature of blockchain transactions.

On Ethereum and most L2s, every transaction — including wallet balances, trade sizes, and counterparty information — is visible to anyone with a block explorer. This transparency, while foundational to blockchain's trust model, creates risks including front-running, sandwich attacks, and MEV extraction that cost retail traders an estimated $400 million annually, according to research from Flashbots.

Shieldnet's zero-knowledge architecture allows users to prove they have sufficient funds and meet protocol requirements without revealing the underlying data. The system is compatible with existing DeFi protocols on Starknet, meaning users can access lending markets, decentralized exchanges, and yield protocols without modifying their infrastructure.

The launch also positions Starknet against privacy-focused competitors on other chains, including Aleo and Aztec on Ethereum, as the race to offer confidential DeFi accelerates. For Ethereum L2s competing for the next wave of institutional users, privacy may prove as important as speed or cost.

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