To addresses? Mostly pointless. To a larger number space that had non-numeric representation, genius and probably inevitable. If we allow for the representatio

To addresses? Mostly pointless. To a larger number space that had non-numeric representation, genius and probably inevitable. If we allow for the representation to be 0-9 and then another ten letters selected for uniqueness and clarity, overlapped with appropriate non-roman pictographs, etc, the same 16 characters jumps to 600 quintillion range, or about 60 bits by napkin math. That's more than realistically enough for hundred billion people to each have millions of real payment IDs with millions more one-time use ones that contained some sort of transaction hash for authorization. Which conveniently fits in a 64 bit word with some left over. I suspect someone involved in the payment space already figured that out a long time ago, but no cataclysmic event has yet happened to de-rail the existing money train. If you wanted to do that in IPv6 you'd still have the upper 64 bits left over :)