you apparently didn't notice but there were some other posts on this list about writing down the random seed that a person used to generate the cash, and then being able to restore the cash somehow based on knowing the random seed, however privacy is sacrified in this case apparently. this with the Chaumian implementation, from what I understood.
I would not say that privacy is "sacrificed" if, in fact, Digicash has implemeneted this "write down the original random seed" backup method. Worst case scenario -- you write down the seed, and when the police break down your door, they find that you've written it down.
point well taken, but I thought the original poster stated that one had to reveal the blinding factors to the bank, which I interpreted as "sacrificing" anonymity. frankly, I didn't understand that whole procedure and that's why I asked someone to go into detail about this very important aspect of the cash beyond the 3 liners or so I have seen.