With a name like balanced, I was expecting double entry book keeping[1], so: you give an account to a device, e.g. the credit card processor, and measure how mu

With a name like balanced, I was expecting double entry book keeping[1], so: you give an account to a device, e.g. the credit card processor, and measure how much money is entering and leaving the company per device. Plus you give accounts to each customer and measure money going in and out their separate channels. Then you check these two different modalities of tracking money conclude your the same liquidity measure for your company. If they do not then you have sprung a leak somewhere and can halt everything. That would be an extra layer of security. Passing loads of tokens round is still a single point of failure at the conceptual level. [1] http://en.wikipedia.org/wiki/Double-entry_bookkeeping_system http://en.wikipedia.org/wiki/Double-entry_bookkeeping_system