Basically like the disguise notes: papers that when you right click, add meebles to your account. Anyone could create a note with a simple command like /note <amount>. Sort of meeble checks. This would have several benefits, such as allowing people to store money, and avoiding confusion when paying somebody who isn't online. Finally, slot machines would be far less complicated, as notes could be dropped instead of the books that you sell, especially since the shops to sell the books often dont work.