Tree based textboard

What does /prog/ think about boards like treeboard[1] and ayashii world[2]?

[1] http://tree-board.net/
[2] https://sonzaishinaiworld.heliohost.org/bbs/bbs.php?m=tree

How do you implement a functional voting system on an anonymous board without collecting cookies (gay) or allowing registration? Anybody could just spam the up or down votes and there would be no reason to trust them.

I suppose you could encrypt their IP and then forbid identical crypts from voting the same way. I guess I answered my own question.