goatmeal on Nostr: there are only a few rollups at the moment that have a permissionless exit mechanism ...

there are only a few rollups at the moment that have a permissionless exit mechanism and are therefore not custodial. they happen to be the most popular rollups. there are currently NO rollups with decentralized sequencing. the only way I could see that working in the Ethereum world is with even more proof of stake. you'd have to set up your rollup sequencer node by putting up the protocol's governance token or some other asset so it can get slashed in case you do something bad.

a rollup on bitcoin would be unique because you wouldn't have to do that in order to decentralize the sequencer. you have all of this proof of work laying around that can be repurposed via merge mining. realistically you could retrofit rootstock and turn it into either a ZK rollup or an optimistic rollup and keep the PoW block production on it, then you would immediately have a stage 2 rollup on bitcoin.