- There is a new main blockchain called fNXT, used only for forging and simple transactions (without involving assets). So this is meant to be a much smaller blockchain than actually.
- NXT and all MS Currencies will be child chains from fNXT.
- The child chains are pruneable, although every full node owner can opt to keep all transactions forever ("archival nodes").
- Assets will be global and it will be possible to trade them with each "child" currency, not only NXT. I think also asset-to-asset-trading was meant to be possible this way.
Advantages:
- Better scalability, because of the smaller disk space requirement for simple (not-archival) full nodes.
- important: MS currency transactions pay their fees in their own currency, not in NXT. That will make them much more usable than today.
- Asset trading to MS currencies and other assets (?)
Disadvantages:
- The fNXT chain needs a new auxiliary currency. The plan is to distribute it among NXT holders, but not asset holders. So asset holders are the main opposing group to the 2.0 plans because they won't get fNXT when NXT 2.0 is launched. There is still discussion about this issue.
i stopped following nxt closely, but last i checked ms currencies would stay on the nxt child chain and not become their own child chains. has that changed?
also assets can be global, but don't have to be global. issuers can decide afaik.