Bitcoin (BTC) is up roughly 24% in August, its largest monthly advance of 2026. This month’s rally lifted the asset from the $60,000s to briefly over $80,000.

However, three warning signs now emerge: exchange balances, exchange-traded fund (ETF) flows, and spot demand have all turned less supportive during the closing days of August.

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Bitcoin Warning Signs Build as Binance Reserves Hit a 2026 High

Binance’s Bitcoin reserves have climbed to roughly 687,000 BTC, the highest level recorded in 2026, according to CryptoQuant data. Reserves dropped near 617,000 BTC in late April before reversing. The build then accelerated through August, as Bitcoin rallied.

Traders usually move coins onto an exchange to sell, hedge, or post collateral. Therefore, a rising balance during a rally makes more supply immediately available for sale.

The number alone proves nothing. Wallet reorganizations, custody shifts, and market-making transfers also lift exchange balances.

Still, that supply now sits on the largest venue while shrinking exchange stablecoin reserves leave less idle cash ready to absorb it.

“A yearly high in Binance reserves near major resistance is a warning sign. The next move above $80,000 will likely depend on whether spot and ETF demand can absorb the additional supply potentially available to the market,” XWIN Japan wrote.

ETF Inflow Streak Breaks as Weekly Demand Halves

Meanwhile, US spot bitcoin ETFs posted a $201.8 million net outflow on August 28, according to SoSoValue data. That red session ended nine consecutive days of inflows, which came as Bitcoin recorded its largest weekly dollar gain on record.

Other major products stayed green on the same day. Ethereum (ETH) funds drew $102.18 million, while XRP (XRP) and Solana (SOL) products added $26.2 million and $18.08 million.

Weekly flows cooled as well. Net inflows fell 51.8% to $924.5 million in the week ending August 28, down from $1.92 billion.

One negative session does not confirm a reversal. However, ETF flows are a major source of demand for Bitcoin, and that may be thinning.

Leverage, Not Spot Buying, May Be Driving the Move

Finally, analyst Crypto Rover argued that the weekend advance lacked spot participation.

“BTC is moving higher over the weekend while spot CVD remains almost flat, suggesting leverage is driving the move. Last time we spotted this same setup, Bitcoin dumped from $81K to $77K,”

Spot cumulative volume delta (CVD) tracks the balance between aggressive buyers and sellers in spot markets. A flat CVD during a rally can suggest that derivatives or leveraged positions, rather than strong spot demand, are driving the move.

Not every analyst reads the setup that way. GSR’s Andy Baehr has framed the $80,000 breakout as a new market regime built on ETF demand and short liquidations.

Seasonality offers thin comfort. September has averaged a 3.08% loss for Bitcoin since 2013, Coinglass data shows, the weakest average month of the year.

Recent years cut the other way. The last three Septembers all closed green, including gains of 5.16% in 2025 and 7.29% in 2024.

The coming sessions should show whether spot and ETF buyers can absorb the coins now parked on Binance.

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Source: BeInCrypto