BTC addresses use Base58 (like Base64 but without having equivalent character: IOl0+/) and will have to start with either 1, 3, bc1q or bc1p based on what type of address it's. This enables builders to produce markets, keep registries of debts or guarantees, go resources in accordance with Guidance given https://ethereum-address-generato96396.blogdun.com/30064155/the-basic-principles-of-eth-address-generator