thanks for this link. The paper touches on many of the issues/considerations I was looking at with regards to denominating currency using a 10^x + offset system (essentially rational numbers). Fun to see the limits really explored. As some will recall, our prototype blind sigs denomination system dealt with the problem of receiving dust amounts by introducing a sliding window such that all Tx inputs and outputs must be within a given range by exponent. This allowed for smaller units to come into common usage over time as the real value of the money increases but without any fixed limits, such as bitcoin’s hard-coded dust limit.
For ringct, we have private amounts and are constrained to a u64 by the bulletproofs, so the above is useless. fun memories though.