Bitcoin has struggled to establish a convincing move above $80,000 as uneven demand from US investors weighs on the latest rally. Inflows into US-listed spot Bitcoin exchange-traded funds improved in August but remained inconsistent, with the funds recording two sizable outflow days in the past week. The seven-day average Coinbase premium, which measures prices on the United States' largest exchange against international platforms, has stayed negative for more than four months, including during last month's rally.