Human Hash

[taera249]

There is a great development that can solve a lot of problems and can open the door to new features, I am trying to figure out if there is a way to build this feature.
The idea is to build an "hash" to identify a real person. There must be 3 property.

1) for every human must be a unique hash id
2) it is not possible to build this hash id without the real person ( it is not possible to build in an automatic way these id)
3) decentralized , without a certifier authority

For example a not working solution can be something related to the dna code , build an hash from the dna but violate the point 2 because is possible to build in automatic false hash id ...

Any idea for a solution?