In the above link, "The protocol ensures that the identity off-chain remain anonymous and privately secured, only the address will be mapped on the blockchain."
So, off-chain identify is also priavte ?
haha, I think I understand now, the on-chain address helps the the realization of off-chain identity private and protected.
Yes exactly
So you see there are many ways in real life to lose your identity to hackers, therefore we must do our best in this project to prevent identity theft to prevent drug trafficking to secure the real identities of real people.