June 29 (Cointime) -Vtalik Buterin, co-founder of Ethereum, responded to a question about the advantages and disadvantages of wallets based on MPC (EOA) and smart contract wallets during his Twitter AMA. He stated that EOA wallets based on MPC have fundamental flaws because they cannot revoke keys (excluding re-sharing, as the old holder can still recover the key). Smart contract wallets are the only option.