Resolves as a percentage, rounded to nearest integer, according to the Discount to NAV listed on this site: https://ycharts.com/companies/GBTC/discount_or_premium_to_nav

This means a negative value on the chart will resolve as its absolute value, rounded to the nearest integer.

For example, at the time of market creation, the site reports "-45.08%"; this would make the market resolve 45%.

Any chart value >= 0 (i.e., if the fund trades at a premium instead of a discount) will resolve as 0.