Where are private keys for mixed Bitcoin Cash stored?

So I was thinking about Cash Fusion. I was wondering, since Bitcoin Cash ends up at a whole bunch of different addresses, you must need the keys to every one of those addresses to spend them. Where are these keys stored? Can you still recover mixed Bitcoin Cash with only your original private key? Or are they separate from the original private key?

submitted by /u/shinyspirtomb
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source https://www.reddit.com/r/btc/comments/grxj5u/where_are_private_keys_for_mixed_bitcoin_cash/