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So this is a thing I'm making right now. A "dumb" TOTP authenticator so that I can wipe my phone without worrying about backing up TOTP keys (having a backup copy kind of defeats the purpose).
Note: the displayed tokens are definitely not real.
@PeterCxy Why don't just use a FIDO security key (there are already many good well-known open source implementations)? it would be much easier for manage and login to your accounts.