It looks like Dr. Stefan Brands' book, "Rethinking Public Key Infrastructures and Digital Certificates; Building in Privacy", with outstanding discussion of, among other things, ;-), internet bearer transactions, has gone through the mill at MIT press and come out the other side. If you couldn't get a copy of it when Stefan offered it as a self-published version of his doctoral thesis, now's the time to get it. Cheers, RAH --- begin forwarded text