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I wonder how was that possible. The blog doesn't say much about that.
It is a security issue, and if your upvoting system can be compromised then other systems are in danger as well. I'm not judging, it's just basic IT security problem and I wonder how you plan to solve it.
@heimindanger the posting key is enough to give upvotes, which is the lowest rank but still, it is their responsibility to keep it safe.

So they change the exact moment their upvoting system, when they also change their keys?

It can be just prevention.

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