This is the closest thing I’ve heard of that does some sort of casting. AFAIK it doesn’t replace chromecast. I’ve never actually used it.

My solution to this since my house is small is to use an amp that supports multiple speakers that all the devices connect to and then wire speakers through the house. I’ve thought about connecting the amp to a small computer and streaming the audio to my sheds using ROC. The neat thing about this solution is I can play my records and tapes too and listen to them seamlessly between rooms.

After you explained it a bit further in another comment it was pretty obvious you didn’t mean cryrocurrencies. I really did latch onto “crypto” as cryptocurrency, unfortunately the case for a lot of people.

Yes, we all know crypto and scalability go hand in hand /s