Credit Commons: Solidarity economy money

What if the hundreds, even thousands of existing local currency initiatives were interoperable? Could they constitute a global system of exchange and offer at least a partial alternative to a dominant parasitic financial system? What are the social and technical obstacles to scaling grassroots initiatives which grow out of local community action?
The Credit Commons is a proposal from the builders of two of the largest blocs of community currencies in the world. Tim Jenkin, developer of Community Exchange Systems and Matthew Slater, developer of Hamlets and cofounder of Community Forge. A new white paper introduces the a backbone accounting infrastructure, touches on the economics and the technology, and describes the parts already in place. A small but diverse group has formed around the initiative and set up where the paper is hosted and developments can be recorded.