GBTC Premium with MA smoothing

GBTC Premium based on formula published online.
With smoothing.

הערות שחרור:

Added STD Dev bands in white based on EMA value and inputs added for len and # of std dev's

הערות שחרור:

Added input fields for std-dev, changed coloring for legibility, removed fill between EMA and VWMA.

הערות שחרור:

Updated the # BTC/share per Greyscale.

הערות שחרור:

Updated new BTC/share rate