Of course no proof, that's near impossible. So let's see what I got for hyper circumstantial evidence. Now, MoD is totally right about the btc price increase, however the nsr price has been relatively decoupled to USD and has been mostly related to btc in the past. Anyway, go with me on the logic leap that nsr are priced in btc instead of USD.
So you have buybacks, and the price leaps from 10 to 20 microbtc in like a week or two. Now, there was a lot of non-Nu volume at 10 before the leap and it's a reasonable assertion that those are the buys that are now selling. However, if you look at the volumes, we bought those people out by now, or at least mostly. They are trying to start the dump, because we bought them out.
Anyway, then there's the wall at 20 and we have to do it all over again. We bleed nsr from them while they bleed btc from us. It's funny, because we both think we're winning as we provide liquidity for each other.
Or, it could be a few investors exiting Nu, that's possible too.