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not sure what you mean by the question.

No. Poloniex is a centralized exchange, with past history of trouble during big moves, support can take literal weeks to respond and they blocked Steem/SBD withdrawals for a very long time. With the vast offering of exchanges nowadays, Bittrex, Open Ledger, etc, unless you have a very compelling reason to stay in Poloniex, you should consider moving away from it.

I am the Great Cornholio! Would you like to see my portfolio? I have a portfolio in my bunghole, with my óleo!

Hey thats the funniest response I have seen from you yet @cornholio
Based on ur rep though ur gonna have to do a lot better than that.

If one uses bitshares openledger, does that mean you will able to claim btc cash? How does one find private keys of the individual assets on bitshares?

The advice is to take your BTC out of exchanges as exchanges will opt for one or the other. After the fork you should be able to exchanges that either do all the forks or different exchange for each fork and convert to each fork. Eg. you if you have 1BTC that will equal 1BTC and 1BCC after the fork.

The values for each of these are yet to be determined

Bittrex has stated they will support whatever happens, and you'll have BCC worth whatever BTC you had on the exchange on July 31st-August 1st.

Bittrex is a much better option than poloniex, hassel free and easy to setup. Never had a problem trading or with deposits and withdrawls, I believe that is also the general opinion from most that use it.
They have also recently stated they will support BCC, if you have BTC there you will get BCC, unlike certain other exchanges.

I've had positive experiences on Bittrex too. never a problem trading there when other exchanges are slowing down/shutting down due to large amounts of trading. My only beef is that the charts are awful and often lag the actual market history.