What could go wrong if a block provides only the result but hides the transaction data?
Rollup security depends on data availability: only when transaction data is public can anyone recompute the state, submit fraud proofs, or withdraw funds independently if the sequencer goes down.
Don't laugh—I learned this the hard way, too.
Markets are always uncertain, so decide in advance what you'll do if you're wrong.
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I get it wrong a lot, too. Don't take this as advice.