I have a vivokey spark, and I used to be able to test and demo it to other developers on how the future of cryptobionic implants could work with passwordless authentication. The demo was on the Vivokey API site, api.vivokey.com, where you could log using only your vivokey.
I just checked, and the API website has changed and no longer has any way to log in.
Does anybody know what happened? Does anybody have a working vivokey spark login demo?