The End of Sandwich Attacks? How Encrypted Mempools Are Reshaping DeFi Security in 2026

MEV bots extracted over $1.2 billion from DeFi users in 2025 through sandwich attacks, but 2026 brings structural countermeasures such as encrypted mempools, intent-based architectures, and protocol-level protections. Encrypted mempools—built by projects like Shutter Network, Flashbots' SUAVE, and Optimism—encrypt transactions before ordering so bots cannot see and exploit them, though challenges around latency, liveness, collusion, and censorship resistance remain.