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The comparison to silver was extremely helpful in anticipating the blow-off and initial collapse but the extent of the BTCUSD rally from 2/6 recalls behavior following the 2013 top.
Following a parabolic advance, BTCUSD declined 67% from its late 2013 high in 18 days, recovered 78.6% of that decline in 19 days, and then resumed lower.
Following a parabolic advance, BTCUSD declined 70% from its late 2017 high in 51 days, recovered ? of that decline in 51+- days, and then ?