please note that we at Delft University of Technology have been working on a similar bandwidth-as-a-currency system since August 2007.

BBC New article from 2007: http://news.bbc.co.uk/2/hi/technology/6971904.stm Running decentral market code and tech portfolio: https://github.com/Tribler/tribler/wiki

Notes after reading your whitepaper, latency and complexity matter. We copied the Tor packet layout and deployed a simple NAT puncture method to avoid difficulties. Your proposed approach looks like many years of work.