I had seen a proposal for a drive chain a while back that used zcash. You could swap bitcoin from main chain and swap back to improve privacy. But I’m sure there are other uses.
#asknostr what are drivechains used for?
Discussion
From what I remember:
You can do pretty much what you want in a drivechain, similar to what you see in the ETH L2 world at the moment. From optimism, zk rollups, zkevm, etc.
It allows to keep a state in another chain anquored to L1.
Security is via time delayed changes in L1.
The changes to L1 btc would be minimal and do not change what already exists.
Good description !