For crypto investors, one of the most exciting times of the year is “altcoin season.” That’s when smaller market cap altcoins skyrocket in value, far outpacing the performance of Bitcoin (BTC -0.19%).

That’s why inventors are constantly on the lookout for signals that altcoin season is nigh. Right now, a key indicator is flashing green. If history is any guide, some altcoins could be ready to go parabolic.

The “Bitcoin Dominance” metric

That key indicator is known as the “Bitcoin Dominance” metric. It simply refers to the percentage of the crypto market’s total market cap that Bitcoin accounts for. The higher the percentage, the more dominant Bitcoin is.

Right now, the market cap of Bitcoin is $1.7 trillion, while the total market cap…