Whereas in the original SADF test the starting value of the window, r1, was fixed to 0, in the GSADF test the starting point can now vary from 0 to r2 − r0 (this is the last possible starting point, near the end of the data set, that allows the test to be run on the minimum window size).
Meanwhile, even the most enthusiastic bitcoin evangelists are realizing that a retooling is in order. Michael J. Casey, a senior adviser for blockchain research at MIT’s Digital Currency Initiative, recently wrote about how the crypto-winter has arrived, but it may lead to better things down the line:

Beyond the clampdown by some governments, what bitcoin really needed to achieve sustained success was overall mainstream acceptance. While some financial institutions announced projects exploring blockchain-based solutions, many others balked.
The company has grown to become one of the biggest names in crypto by allowing anyone to use its service to trade myriad tokens, many of which are unavailable or limited on other exchanges. But over the past year, Binance has matured and begun to offer more formalized services. Following fiat currency exchange launches in the U.K., Uganda and Singapore, Binance is opening a dedicated U.S. exchange to avoid uncertainty around its legality.