It's possible and not difficult to mine YAC with GPU, at least for the first 1-3 month.
be safe to trade.
and the proof is where?
look into the source plz, Nfactor will be less than 10 for a long time.
they have plenty time to modify cgminer before launch,
and the short block interval helps them a lot too,
u see too many orphons aha, but what about their server cluster at the very begining?