(Bloomberg) -- Bitcoin has risen about 30% since its lows in June, but hints of a larger advance toward key resistance at $25,000 are beginning to appear. Prices have tagged the so-called upper Bollinger Band after a period where volatility was compressed, which is often a precursor to a sustained, directional move. A similar stretch of low volatility was seen in June, which subsequently saw Bitcoin sliding after it tagged the lower band.

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