A Peercoin dividend address is associated with each NuShares address (they are the same root, in fact, just encoded differently).
For an exchange to be able to get a dividend payment to someone who holds funds on the exchange one of two things needs to happen:
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Each set of held NSR is in its own address on the exchange, so it is straight forward to export the priv key from the NSR address into the exchange’s Peercoin wallet and map that to the user’s Peercoin balance.
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Each set of held NSR are communally stored in addresses. In this case the exchange would need to collect all of the Peercoin priv keys and import them into their Peercoin wallet. When the dividend distribution occurs they can deposit an amount of PPC into each holders account proportionate to the percentage of total NSR held on the exchange by the user.
The Peershares code can be used as a model to see how this works. @sigmike is the best one to qualify if there are important changes between the code.
The development team can work with the exchanges to understand how to implement a solution such as the two I described above, but it is my personal belief that it isn’t our responsibility to do it for them.
NSR held on exchanges are not capable of being used to mint by the holder (only the exchange), and therefore, cannot cast votes. This decreases the usefulness of those NSR existing on the market.
I don’t see a reason that the Nu product team should encourage it.