index chunk using uint64
index chunk using uint64

ericflo/Sia,NebulousLabs/Sia,mtlynch/Sia,ChrisSchinnerl/Sia,NebulousLabs/Sia,MrStrong/Sia,MrStrong/Sia,mtlynch/Sia,ChrisSchinnerl/Sia,mharkus/Sia,mharkus/Sia,ericflo/Sia