aj15 

newbie to crypto
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Watching is needed, but the difference here is that:

- *anyone* can report fraud and be rewarded with a big bounty (coming from the operator's bond). It doesn't have to be the user being affected as in the case of state channels.

- compared to plasma, (a) the fraud reporting is not reliant on the cooperation on the part of the operator, and (b) in the case of interactive provers, enforcing fraud verification doesn't require the entire rollup state, in fact the rollup block production can even c…