Vitalik Buterin unveils plan to curb Ethereum block builder centralization

Another focus of his post is so-called “toxic MEV,” where traders exploit visibility into pending transactions to front-run or “sandwich” users’ trades. What to know : Vitalik Buterin is turning his attention to who gets to decide what transactions goes into a block. He laid out a series of ideas aimed at preventing block building, the process of assembling transactions before they’re finalized onchain, from becoming too centralized.