I think the digital signature can combine to biometric method to identification so that it is more user-friendly. So this method is trendy now. But there is a concern that the database containing user's biometric information need to be built, which is a concern about the privacy....
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Thanks for the comment @tinytaruen. The privacy debate will always be an issue, doesn't matter the technology driving it. For me the only solution to this is decentralization and to ensure that there is no one entity that controls the data. Cryptographic solutions can encrypt the bio data of individuals which will ensure it is not publicly available and the blockchain can decentralize the solution to ensure no one company can manipulate and misuse the data