I have an idea about margin call.
For example, I short 1000 usd with 2bts backing.
when the price is up to 1000 usd /1.5 bts, margin call excute.
forced execute a buy order: buy 1000 usd with price 1000usd/1.5bts.
this buy order can not be cancel.
and 5% fee of bts will assessed.
the one who hold bitusd have two choice: sell bitusd with 1000usd/1.5bts, or hold continue to sell for more high price.
From this we can avoid to create bitusd with no backing.
比如我以2bts抵押发行了 1000 bitusd。
当bitusd涨到超过 1000 usd/1.5bts 时会执行强制平仓。
网络强制挂出一个买单:按 1000usd/1.5bts 的价格,买 1000 usd。
这个买单无法撤销。5% 的平仓费用被扣除。
持有bitusd的人有两种选择:按1000usd/1.5bts 价格卖掉获利;或者选择继续持有等待更高价格,当然风险自担。
这样能避免生成无抵押的 bitusd。