Wow, I thought the time-based 'money' existed only as fiction in, say, 'In Time' movie. So you are trying to make it updates, perhaps a time-currency blockchain? I would not be too comfortable with an eye scan, because I don't like to see bright light and stuff like that, so I'd avoid additional exposure like this, but fingerprint is a fine way of confirming identity. I wonder how many people are interested in this time distribution conception is general. Are you developing this thing for a specific project or is it more of an experiment?