Is like when we touch on finger print widget blynk api authentic with our smartphone and process the next on off relays or any device same like a button
Fingerprint authentication on mobile devices is quickly becoming outdated technology and being replaced by facial recognition and iris scanning. So, the widget would need to be an “authenticate me” widget which used whatever authentication protocols were available for the device being used.
However, access to the new Blynk app can now be secured using Biometric Authentication (in the settings menu) so only authorised users would be avowed to use the app if you enabled this option.