A grain is a unit of mass equal to 0.06479891 gram, in both the avoirdupois and troy weight systems. An avoirdupois pound is 7000 grains, whereas a troy pound is 5760 grains.
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... Ross J Anderson on his Web site at www.cl.cam.ac.uk/~rja14/tcpa-faq.html/ for a clear discussion of two prominent proposals.
Examples of existing "digital ...