I would watch this weekly BTC Dominance chart carefully

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Clear potential breakout above long term resistance trendline for BTC dominance. Now there is always the potential for a fakeout and then break below which could lead to alts increasing, but this is something to watch closely for the time being.
Note
Now it has broken out and retested trendline as support. Potential coil for next move up, otherwise breakdown of trendline signals a buying opportunity for alts.
Trend Analysis

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