Basically, mine craft should have some way to ban a computer itself.
Maybe have a file containing an id on the computer. Basically, it works like this:
On connect, if there is no saved id, generate an id based off system characteristics.
If that's already taken, add one to the id, and check.
The ID should be long enough to avoid the possibility of exhaustion.
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I disagree with you, therefore you are wrong.
Quality of output = Skill * Effort