Implementation of Headjack

Headjack will be an Ethereum rollup - it's still not decided if it will have a custom VM (there are potential optimizations) or if it'll use the EVM.

It will make use of EigenLayer - that way it will be possible to reuse some of the staked $ETH in the Eth 2.0 consensus and to re-stake it in an opt-in way to offer economic security for the Headjack blockchain. A good talk about EigenLayer by Sreeram Kannan can be found here. Their whitepaper was released in February 2023.