When a checksum is invalid, warn the person the phrase isn't some thing created by your app, and talk to when they would like to utilize it anyway. In this manner, your application only has to maintain the wordlists for the supported languages, however , you can recover phrases created http://edgargvkh682.theburnward.com/from-mnemonics-to-security-understanding-bip39-passphrases-and-their-importance-in-copyright