BTC historically has major support at each of the key levels of retracement from its move down. The order book on all of the exchanges looks strong at $680 and the bears are thin up to 720. $645 is my lowest expectation, BTC rarely retraces this far. I believe the funimentals behind the move down were: - The "news"(/manipulation rumour) from zero hedge isnt...
Expecting BTC Continuation pattern with a bumpy ride through 608-625 before return to 2016 to long term bulltrend at $685 in December. Just an idea. Happy Trading.