Math Hurstel developed a secure ETH transfer mechanism for the kleros/kleros-v2 repository, focusing on improving reliability in arbitration contract workflows. He built the SafeSend library in Solidity, enabling contracts to transfer ETH securely and automatically fall back to WETH when direct transfers fail. This approach addressed the challenge of handling ETH transfers across complex DeFi arbitration logic, reducing the risk of failed transactions. Math integrated SafeSend into both deployment scripts and core arbitration logic, ensuring consistent behavior throughout the system. His work demonstrated a solid understanding of Ethereum smart contract development and contributed depth to the project’s security model.