> Oh I see! And this implies as you would just use a "19-bit" type B in > place of a "20-bit" type A, as it would cost 2x as much they are > exactly equivalent with regards to cost & variance. QED. > > Adam So scheme A (the current scheme) should be okay: A. (as in v1) value = claimed_bits if claimed_bits <= measured_bits Besides, it would be a real pity to throw away the one time someone generates a 160-bit stamp by accident!... :-)