What would a mainchain designed solely to secure sidechains look like?
Everyone who's written about sidechains complicates it by trying to peg a mainchain token with a sidechain token. I don't want a mainchain token or cross-chain transactions. I want crazy sidechains that try out speculative wild-west DAO ideas and fund themselves with their own free-floating fully-native currencies.
Picture a tiny mainchain consisting solely of bundled sidechain headers. The only mining rewards would be sidecoin coinbases. That way, sidechain full nodes would only need to host, in parallel, a light mainchain - without 300 GB of other networks' transactions, like Bitcoin. They would be fully compartmentalized and only need to pay via inflation for the value of the proof-of-work of their own timestamping.
There are a lot of ways to do this and I want you guys' input.
One idea I'm considering is for sidechain miners to form pools and hash their own sidechain headers with references to the same pool key and mainchain parent. Once their *combined* proof-of-work score is enough for a mainchain block, they'd bundle the headers and broadcast it. A sidechain node could weigh a sidechain block by simply looking up the combined score of the bundled mainchain block containing it.
-- Relevant prior research --
https://blockstream.com/sidechains.pdfhttps://www.drivechain.info/https://zmnscpxj.github.io/sidechain/driveproof/index.html