The foundation of Ethereum's security and integrity is its state. Every block, from the genesis to the very latest, holds a unique fingerprint known as the state root. This single, cryptographic hash acts as a guarantee that every piece of data—every wallet balance, smart contract, and token—is exactly as it should be. It’s the ultimate source of truth. So, what happens when that single source is compromised, even by a subtle error? In early September 2025, a bug in the Reth Ethereum cli...