The toolkit allows a sidechain to have its own consensus algorithm and features. The sidechain is connected to the Cardano main chain through a bridge that allows asset transfer between chains. The finality of blocks is determined through a consensus mechanism that relies on the security of the main chain.
The toolkit consists of Cardano Plutus scripts, a chain follower, and the sidechain module.
The IOG team has used the toolkit to create a proof of concept Ethereum Virtual Machine (EVM) Cardano sidechain for developers to test and experiment with.