The fit is ordinary least squares on log10(price) = a * ln(days since genesis) + b, computed over every daily close after day 400 of coin age. The current coefficients are a = 7.4880 and b = -58.4593.
Residuals from the fit span about 1.10 orders of magnitude; nine bands split that span equally in log space, each band roughly 35 percent wide in price terms. The projection extends the fitted curve three years.