The primary resolution source will be: https://www.cboe.com/us/indices/dashboard/vix/

If that is unavailable I may also consider other credible sources, including: https://fred.stlouisfed.org/series/VIXCLS

I will aim to resolve this market before the end of Wednesday 18th, Central Time, unless there is material uncertainty or disagreement about the outcome. I may bet on this market.

Market participants should take into account that the time used for calculation of the closing value may be (and typically is) different to that used for the underlying equity market.