This is my first post on here, but I've been part of the twitter and discord community since 2017. And I'm here to shill my first coil blog post.
If you are wondering what IS a sidechain, what bitcoin sidechains are out there, and why the XRPL is the biggest, have a read in here:
Mirror Mirror on the Wall, How on Earth Is the XRP Ledger the Greatest Bitcoin Sidechain of Them All?
It includes some metrics on the state of other bitcoin sidechains and a comparison to bitcoin IOU's by trusted entities.
Thanks for reading and please drop me some feedback or start a discussion.