The Challenge
BlockTrust, a rising star in the Decentralized Finance (DeFi) space, was preparing to launch their V2 lending protocol. With a target Total Value Locked (TVL) of over $500 million, the stakes were incredibly high. In the volatile world of Web3, a single vulnerability could lead to catastrophic loss of user funds and instantaneous reputational collapse.
They needed a partner who could look beyond standard automated scans and understand the complex economic logic and game-theoretic attack vectors inherent in their smart contracts.
Our Approach
Our team of senior solidity engineers and security researchers conducted a 6-week intensive audit and refactoring phase.
1. Architectural Analysis
We started by mapping out the entire protocol interaction flow. We identified potential bottlenecks in the liquidity pool logic and spotted a reentrancy vulnerability that had slipped past initial internal reviews.
2. Manual Code Review & Formal Verification
We didn’t just rely on tools. We performed line-by-line manual analysis of over 5,000 lines of Solidity code. We employed formal verification methods to mathematically prove the correctness of critical accounting functions.
3. Optimization & Refactoring
Security doesn’t have to come at the cost of efficiency. We refactored the gas-heavy functions, resulting in a 30% reduction in gas costs for end-users, making the protocol more competitive in the market.
Key Technologies
- Solidity 0.8.x: Leveraging the latest security features and overflow protection.
- Hardhat & Foundry: For robust testing environments and fuzzing.
- Slither & MythX: Advanced static analysis tools.
- OpenZeppelin: Industry-standard secure contract libraries.
The Results
The launch of BlockTrust V2 was a resounding success.
- $500M+ TVL Secured: The protocol successfully handled millions in daily volume without a single security incident.
- Zero Critical Exploits: In the 12 months post-launch, no funds have been lost to hacks.
- 30% Gas Savings: Users saved an estimated $50,000 in transaction fees in the first month alone.
“Sparkable didn’t just audit our code; they improved our entire architecture. Their insights into gas optimization and economic security were invaluable.” — Alex Chen, CTO of BlockTrust