I have accidentally sent BCC from bittrex to my own BTC wallet on coinbase. Both wallets are mine - how can I get (find out) my private keys to swap them that I get my money from wrong chain? And how can I use these private keys? Transaction is seen here:

https://bitinfocharts.com/bitcoin%20cash/tx/64c577f636882bf8b0160aaed17da458f4f6c350463426eda11b63b003059ce0