The opt-out form [0] asks only for the name, phone number, DOB, address, email, etc. How do they ensure that someone else did not opt-out or opt-in on someone e

The opt-out form [0] asks only for the name, phone number, DOB, address, email, etc. How do they ensure that someone else did not opt-out or opt-in on someone else’s behalf without their permission? And how are they deduplicating people with the same name and DOB? By a fuzzy match against their address? How do these things usually work in UK? [0]: https://www.organdonation.nhs.uk/register-your-decision/refuse-to-donate/refuse-donation-form/ https://www.organdonation.nhs.uk/register-your-decision/refu...?