One ex-VP at a big investment bank said once that it uses Racorean’s equation (see. http://arxiv.org/abs/1307.6727 ) for pricing bitcoin options.
-σ^4/r(σ^2+r) (d^2 ψ_((S) ))/(dS^2 )+1/S^2 ψ_((S) )=r/σ ψ_((S) )
Is there anybody else that uses the time-independent pricing for pricing bitcoin options or for trading binary /weekly/American options?