Gee, what a GREAT IDEA :D I wonder why nobody's thought of it before! ...oh, wait.

It's not as complicated as it sounds. All you need is a system other people can understand and, most importantly, trust. !!! :D

Start your own currency. The Money ReportIt sounds complicated, but really it's as simple as three steps. First, amass a bank of stuff. Let's say gold. Second, decide on a sensible unit for your new currency. Let's say one "Derek Dollar" token is worth a gram of gold. Third, convince a critical mass of people to use it so that "Derek Dollars" are redeemable not just within my group of friends, but among shops and merchants around the world. Voila, we've got our own private currency. "Derek Dollar" :D Muhahahahahahaha!!!!!

i prefer metal coins for storage. defending them from thieft is perfectly valid excuse, a lawful excuse for killing anyone who tries to take it from me against my will.

bury it... im serious