If a Layer 2 network submits an incorrect result, who can catch it?
One detail: withdrawing funds from an Optimistic Rollup to the mainnet via the official bridge usually takes around 7 days. This period is the challenge window for fraud proofs.
The sequencer can decide the order of transactions. Mature Rollups let users bypass the sequencer and force transactions through the mainnet, preventing transactions from being rejected indefinitely.
Understanding this matters more than memorizing a bunch of terms. Try to invest only what you can afford to lose without it affecting your life.
$ARB and $OP use Optimistic Rollups, while $STRK uses a ZK approach.

The data is from public sources. Please verify it yourself.