How do you create such tiny payments? When I try (2.1.5a MT) to pay $.001 I receive the warning "Too many digits after '.'!" and even though it's just a warning I can't do the payment. Assuming that you had a client that allows tiny amounts, how would you represent a tenth of a cent in binary? To to it exactly would require an infinite number of coins...

The minimum denomination for each currency is (sort of) configurable. For instance, for Belgian Franks the minimum is 1 (and no '.'). If a bank requested a currency capable of handling a mimimum of 0.00005 we could make that happen real easy. Note that with the maximum coin size 2^15 times minimum amount, the maximum coin would get a lot smaller, so that it would become more impractical to pay large amounts in that currency. On the longer term we can of course even change - the 2^15 maximum - maximum number of coins per message (currently 75) if the requirements were there. // Marcel van der Peijl, DigiCash bv, http://www.digicash.com/~bigmac/ // ----------------- insert subliminal message here ------------------