Bip39 json https://writeablog.net/ipennywpzc/the-ultimate-overview-to-offline-bip39-generators-remain-secure The buy with the mnemonic phrase issues. When you mess up the purchase then you cannot recover your wallet. All of your money is going to be dropped without end. Ensure you have a correct backup. BIP39 improves wallet stability by generating backups responsible, quick, and proof https://blogfreely.net/travenmdoq/create-your-own-distinct-bip39-mnemonic-expression-with-python-scripts