This is not good, as u did not consider the case that no one want short.

1. We need to enable interest rate range from positive to negative. If large demand of USD or no one want short, shorter can set the interest to negative, to hedge some risk. If people do not want USD, but some people still want to short, then they can set the interest to positive, to encourage people hold USD.

2. We need to enable the monthly reset collateral rate to 200%, for the short order that collateral no more than 200%. Shorter can chose add their collateral, or cover this short. Short order that with collateral rate more than 200% no need cover, the part of collateral more than 200% will be automatically return to shorter.

3. If we have 1 and 2, I agree with your force-settlement. But we shall only force settle the bitUSD that are listed in the sell side market. This will give potential  bitUSD buyer a chance to buy the bitUSD, this can reduce unnecessary settlement and reduce settle-attack. Force-settle will force the short order that will the less collateral rate first, and the oldest order settle first.

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Quote from: alt on April 07, 2015, 01:14:50 am

when cover order expired, we take off the interest,  and forced cover 10% of the  debt.
then update the left order's time to current.

for simplify the develop
every time we cover part of the debt, we can delay the expired date to (cover balance)/(total balance) * 1year

Quote from: tpfan on February 03, 2015, 11:34:55 am

bts不是可以买任何资产么，也没有流动性问题，如果bts买不到bitcny，bityuan就能兑换到？

以上提到了两种对bityuan的替代方案，bitcny 或者 BTS，我在这里再总结一下其优劣。
1。 如果是用bitcny 或任何其它抵押资产作为基础兑换媒介，因为其流通量受价格影响太大，我们无法保证其充足的供应，比如bitcny如果卖光了，资金池所有资产就无法运转了。
2。 如果用BTS，供应量会比较充足，但是因为BTS的价格波动太大，基于BTS的兑换浮动价差必然要比较大。比如我要使用BITCNY购买BITGOLD，这个市场现在几乎没人玩，我可以选择基于BTS做中间过渡，BITCNY对BTS做市差价可能要到1%以上，BTS对BITGOLD又要1%，加起来就是2%了。如果基于BITYUAN过渡呢？因为BITCNY，BITGOLD，BITYUAN的价格都相对稳定，其价差会小很多，可能只需小于1%的价差就能完成。

现在我们开通了一步兑换服务，那么BITYUAN是否就可以退出了呢？也不是的。一步兑换服务很方便，但是由机器人做买卖，必然有很多限制，比如交易额度，价格发现机制等等，小额兑换服务可能比较适合使用这个服务。而在BITYUAN的交易市场，我们可以自己寻找更好的价格点，处理更灵活的交易量，并且因为更多的参与者而能找到更多交易对手。

因此我认为推出BITYUAN资产，对盘活内盘资产是有很积极的意义的。