With BitVM, it might be possible to simulate #BIP300 sidechains without a soft fork.
https://bitvm.org/bitvm.pdf
I think they'd be more like ethereum's rollups than bip300's drivechains
But yeah a sidechain is a sidechain
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Also roll ups seems very complex. Don’t think I will ever be able to understand how I will ever really work. drivechain is much simpler to understand.
Transactions happen off chain and are added to main chain hash data.