Yes, it's about their bitcoin reserve. Coinjoin is used to anonymize your bitcoin. In short, imagine many users throwing their keys is a hat and after mixing each walks away with someone else's key of the same value minus a small fee. Look it up yourself, it's a great way to learn and extremely useful later on (if you're not familiar with it yet).
Thanks for the great explanation. I have little to no idea about Bitcoin. But I intend to learn about it.
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It pays off to learn about it in the first place. You'll know what to do next. Use #asknostr for any questions and someone will most likely help you. Good luck!
Thanks a lot.