Hi @mephistophenes

A modular blockchain is a concept for using existing blockchains in a new way. The Bitcoin side chain Lightning uses the cryptocurrency token Bitcoin, but transactions occur on Lightning, while settlement and data storage occur on the main Bitcoin blockchain.

This is an example of Modular Blockchain activity.
This allows games to take advantage of the speed of Lightning and the low transaction cost of lightning.
Lightning was created for this purpose. Other blockchains could also be created to duplicate this purpose. These chains could perform like Lightning, transactions and lower fees, but settlement and storage of data occurring on the main chain.