TL;DR
- Bitcoin gained 25% in August after expanded Treasury bond buybacks, marking its strongest month since November 2024 and entering a cycle-bottoming window.
- U.S. spot Bitcoin ETFs absorbed $3.05 billion in August, while futures open interest and funding stayed below levels associated with crowded market euphoria.
- September’s main tests are $76,000 to $78,000 support, continued ETF inflows and $81,000 to $82,000 resistance, which 21Shares says separates recovery from a bear-market bounce.
Bitcoin’s roughly 25% August surge has pushed the market into what 21Shares describes as a decisive September test, after the U.S. Treasury’s move to at least double long-end bond buybacks helped trigger the strongest monthly gain since November 2024. The crucial question is whether August marked a genuine cycle turn or merely an unusually powerful bear-market bounce. The rally also arrived inside the historical window where prior Bitcoin bear markets have ended, strengthening the firm’s view that recent weakness may represent the late stage of the current cycle rather than a new prolonged decline.
September Must Confirm Whether Bitcoin’s Breakout Can Hold
The move was reinforced by both positioning and spot demand. Roughly $1.4 billion in Bitcoin shorts were liquidated, while U.S. spot Bitcoin ETFs attracted more than $3.05 billion during August, their strongest month since October 2025. Futures open interest remains around $54 billion, still 23% below the roughly $70 billion peak reached near last year’s bull-market top, while perpetual funding is near 10% annualized. That combination suggests leverage amplified the breakout, but has not yet reached the crowded conditions normally associated with market euphoria. ETF demand arrived while Bitcoin remained 35% below its all-time high.
Bitcoin now faces its most important technical hurdle between $81,000 and $82,000, where the 50-week moving average and earlier rejection zone converge. The $82,500 level also approximates the cost basis of U.S. Bitcoin ETF holders. A weekly close above this region would separate a broader trend recovery from a rally that ultimately fails beneath long-term resistance. Immediate support sits between $76,000 and $78,000, with lower reference levels at $68,500, $65,000 and $60,000 if selling pressure overwhelms the breakout structure during September. Above resistance, 21Shares sees $85,000 opening quickly before the $98,000 yearly high returns again.
September therefore becomes a test of liquidity, flows and policy. 21Shares is watching whether ETF inflows continue absorbing profit-taking, whether long-end Treasury yields stay contained once expanded buybacks begin, and whether Bitcoin can defend $76,000 to $78,000. Short-term holders have already sent more than $500 million per day of profit-held BTC to exchanges since the breakout. The firm’s cycle view remains constructive, but confirmation now depends on sustained spot demand and a break through $81,000 to $82,000. Failure could produce another retest rather than, in its framework, a new long-term bear phase. September will decide which.
