Be sure to Observe that vanitygen is a legacy system and that the information underneath is furnished for historic uses. BTC addresses use Base58 (like Base64 but with no very similar character: IOl0+/) and should get started with either 1, 3, bc1q or bc1p according to which kind of address https://eth-vanity-address-genera53185.ja-blog.com/27093825/manual-article-review-is-required-for-this-article