Comment by andrewflnr

Basically, pick something with no value as a store of value. If we want to do that, we can just stick with fiat currency in a database. No reason to pick a material.

If we want a physical store of value, I actually think something of use that can easily be subdivided and combined is ideal. It doesn't even have to be as valuable as gold is today, this makes just as much sense if gold is cheap and plentiful. The natural inflation from creating more of it even helps cut down hoarding. It just gets harder to carry around enough to buy coffee (which of course brings us back to databases).