Gooday @firstamendment. In my understanding, doing 2fa the usual way (sms to cellphone) is not good for anonymity which is crucial to extract humanity from the chains of the powers that shouldn't be. However, it think its possible to 2fa using your own private anonymous password manager - Bitwarden does this i think and its free and open source). As to 2fa coding at the chain level, i don;t know, but @hivedevs #hivedevs could answer (if i've got the tags right :-)