@bhawthorne @0xabad1dea That's largely because they do.
https://www.rfc-editor.org/rfc/rfc6238
https://en.wikipedia.org/wiki/Time-based_one-time_password
#rfc6238 #rfc #TOTP #2FA #TOTP2FA
#rfc6238 #rfc #totp #2fa #totp2fa