Yea. Then again thumbprint method is not recent or new. Ancient Babylon used it for business transactions. China 200BC used it as identifiers down to even 1800s English used fingerprints on contracts. It's been used longer than IDs and common.
Other human identifiers such as gov’t numbering citizens are through ID, Social Security No
Some unique ones to humans that are still not common : Face recognition, Voice Print, DNA, Iris Scan, Retina Scan.
There are machines built to detect it for the benefit of the users, hence it has its own privacy clause. But nothing so drastic as to scan eyes globally - and this would be a record even the gov'ts won't have (yet). Its a bit creepy
