Bitcoin’s rebound is starting to show its first meaningful sign of U.S. bid-side strength in weeks, with the Coinbase Premium Index turning positive after spending nearly a month below zero. The shift comes as BTC hovers around the $91,000 level in Asian morning hours Saturday. The premium — which tracks the price spread between Coinbase and the global market — acts as a read on U.S. capital flows in previous cycles. A negative print typically signals domestic outflows or risk aversion among U.S. institu ...