Bitcoin rebounded more than 2.5% on Tuesday to $83,944 on Bitstamp, according to TradingView data. South Korea's KOSPI Composite Index extended its weekly losses to 7.4% as semiconductor stocks came under pressure. Bitcoin's gains were capped near $84,000 by sell orders on exchange order books. US spot Bitcoin exchange-traded funds recorded $451 million in net outflows so far in October, including $69 million on Monday. Markets expect interest rates to remain at 2.75% to 4% at the Federal Reserve's Oct. 28 decision.