What Open Transaction is trying to do is to provide a transfer mechanism, rather than issuing a currency, they use the word "cash" in this sense. If you want to hide your Bitcoin transfer, you can choose to use an OT server, which provably cannot see the link between two accounts involved in a transaction.
Fellowtraveler-- if you're willing to do some hand-holding I'd be really interested in making a Chaumian cash transaction through an OT server.
I only ever understand about 30% of your posts. It doesn't make sense to me how Bitmessage could possibly be a missing link for OT, but I'd rather just go through the motions of making a few transactions and see how it works.
PM me