SIRI will be covered by 50% gold later this year. I think it is a requirement if we want to trade them through exchanges. The way I understand it, they will use the equity of My Gold Grams Inc as collateral for loans and buy the gold.
AERO I think is different. There is no "parent token". So we will get the same tokens as the investors (our sweat equity) and these tokens are backed by 20% gold and 20% oil. As far as I know.....and that can always change.