Then indeed it is impossible.
That would not stop a user from creating multiple accounts and hence voting multiple times. Plus, captchas can be defeated, if necessary by setting up a porn site...
Type: Posts; User: laserlight
Then indeed it is impossible.
That would not stop a user from creating multiple accounts and hence voting multiple times. Plus, captchas can be defeated, if necessary by setting up a porn site...
What do you mean by "prove"? I think you need to provide more context, e.g., are the users employed by your company? How important is it to prove this? How scalable must this be?