the issue we had with adt v2 was that cryptsy held around 60% of all adt in existence and were causing forks they would not split the coins up and when it went down they apparently deleted all the wallets and data for alt coins effectively destroying adt v2 if there was a way to solve that issue i would have done it ( if cryptsy had split up the huge wallet from the start when we asked we could have fixed the fork and people could have removed there coins )

as far as i know adtv2 was the first and only coin to do a full block chain swap successfully as for the forking issue it would be an easy fix if a huge chunk of the coins were not on the exchange