BTC Bollinger Bands (20, 2σ)
Locked20-day SMA ± 2 standard deviations — volatility envelope around price.
Why upgrade
What's behind the gate
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What this chart shows
Methodology
Middle = SMA(close, 20). Upper = middle + 2 × rolling stdev(close, 20). Lower = middle − 2 × rolling stdev. Bands widen with volatility and contract during compression (the 'squeeze' setup). Touches of the bands are not signals on their own — context (trend, RSI, breakouts) is required.