Bitcoin is a good indicator of the crypto market in general, because it’s the largest cryptocurrency by market cap and the rest of the market tends to follow its trends.
Combining the BSADF with the GSADF test allows the r2 value to vary while still using a backward expanding window. r2 starts at the smallest possible window size, and moves one point at a time towards the end of the time series.

Disclosure: At the time of writing, the author of this feature owned BTC and ETH.
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