Ethereum is actually a decentralized System that operates Clever Contracts: programs that run specifically as programmed with no probability of downtime, censorship, fraud or 3rd-occasion interference. BTC addresses use Base58 (like Base64 but with out related character: IOl0+/) and must begin with both one, three, bc1q or bc1p according to https://knoxurnkg.nizarblog.com/29371405/detailed-notes-on-eth-generator