On Twitter, RippleX told about the new sidechain design.

On Twitter, RippleX recently told about the new sidechain design. Was noted:
Sidechains, Redesigned
A sidechain is an independent ledger parallel to the main chain. It has its own consensus and is connected to a main chain through a two-way bridge, which allows you to send value between chains.
The new design for #XRPL sidechains leverages a “witness” server to verify transactions.
This simplifies testing and debugging compared to the old method while making sidechains more robust in production.
What are sidechains useful for?
Testing new amendments with real value (e.g. Hooks)
Custom features not appropriate for mainnet (e.g. EVM support)
Private blockchains & CBDC ledgers
At #ApexDevSummit last year, @msvadari explained how anyone can build a custom sidechain