BTC addresses use Base58 (like Base64 but with no similar character: IOl0+/) and ought to get started with both 1, 3, bc1q or bc1p depending on which kind of address it's. GitHub - danielewood/vanityssh-go: vanityssh-go lets you generate ED25519 private keys with vanity community keys Understand your Ethereum address: An https://ethgenerator19730.blogspothub.com/28860341/top-vanity-number-generator-secrets