I don't know whether now I am the one that collated most BTS. but anyway I am sensitive to the feed price, as this is the key factor that trigger margin call.
we always say that the price feed should be "accurate", not "fair", as it's not easy to define "fair", however, it seems we also need to check what "accurate" really mean.
take the BTS/CNY price as an example, when I write the price in yunbi is
0.0229CNY/BTS, in polo it is
0.00000886BTC/BTS and the settlement price is
0.0213CNY/BTS.
here the problem is that polo give a BTS/BTC price, so witness need to convert this price to BTS/CNY, I haven't check the script, but I believe many witnesses adopt the conversion path BTS/BTC->BTS/USD->BTS/CNY.
here the key point is what a USD/CNY rate should be adopted in the last step, I believe now many witnesses adopt the China official rate, about
6.35 , but when BTC is involved, this rate does not reflect the real market status.with such a rate when I write this post the BTC price is
$382 in Coinbase but
$401 in OKCoin.
the below USD/CNY rate is close to the fact in cryptocurrency world recently:
so now let's come back to the question, in the CNY/BTS feed price example, what does "accurate" really mean? how to calcuate an "accurate" price?
in my view "accurate" means the feed price can be a good reference to the traders. so for a CNY/BTS trader, because of what explained above, the BTS/BTC->BTS/USD->BTS/CNY path does not generate an "accurate" price, a BTS/BTC->BTS/CNY path should be adoped instead, and the BTC/CNY rate should be got from the exchange inside China.
hope this problem can be putted on more attention and according action can be taken.