When a user is enrolled, user signing public and private keys are generated.
Return the user signing public key to verify the signature of a signed message during authentication using the withMessageToSign(message)
method.
This could be used for non-repudiation and validation of transactions. The SDK can create an electronic signature on behalf of the user. This requires biometric authentication, as signing can only happen together with a biometric authentication attempt.
Get public key:
Sign using private key: Keyless.authenticate()