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Is that even possible? To have someone just mark a post and once enough quorum is reached, a downvote is initiated? If I'm not wrong, there is a 1hr expiry of every transaction on Steem. If a transaction is not broadcasted within this 1hr duration, it would fail, right? So, this is where it becomes very tricky.

I don't think it would be possible on-chain. The "vote broadcasting" would have to happen off-chain, through a web site or some other protocol. The only part that would be on-chain would be issuing the downvotes.

Even if it were possible, I think you'd want to keep it off-chain anyway, in order to prevent retaliation.

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