Photo by Kira auf der Heide on Unsplash

When Bob Bought Some Vouchers For Carol, Trent and Faith

And Where Alice Can’t Trace Them Back to Bob

A demo of the method I will present is [here].

So how can Bob purchase 10 vouchers for presents for Carol, Trent and Faith, and then for Alice’s store to not be able to tell it was Bob who had bought them. For this, we can turn to obvious transfer, and zero-knowledge…