BTC addresses use Base58 (like Base64 but without comparable character: IOl0+/) and need to begin with either 1, three, bc1q or bc1p determined by what type of address it truly is. Token transfer could be paused. Valuable to avoid trades until finally a time period or freezing all token transfers. https://eth-vanity53063.idblogmaker.com/28799283/random-eth-wallet-address-for-dummies