有另外一个版的帖子正在讨论类似的问题, 我也赞同toast的隐喻非常好,将BitUSD与USD的价格偏离比喻为攻击, 而攻击的工作量可以部分的理解为基于BTS持有量另外一种形式的POS. 至于这个攻击的难度和概率,我觉得还不好说,还是要取决有市场BTS玩家。
They are peace of bet from every market move.
I like this.
BitShares provide a decentralized price feed. The only common point people all across the network have is that the "BitUSD" asset has the words "USD" in it. If someone wants to "attack" this price feed and cause it to deviate from real USD/BTS, and they don't have a large majority of BTS, the opposing market forces from the rest of the network are enough to push the price down and take money from the attacker, because everyone else has the choice of either "cooperate towards USD and make money if other do too" or "defect and hope to make money if enough people coincidentally defect in the same direction as you".
Toast gets a 1 PTS tip... this is an accurate description though it is can certainly be improved upon... note this bounty pays for multiple answers...
这个解释确实好。
既然可以认同是另一种意义上的 POS,那它也会像 POS 一样,你只有掌握其中 51% 股份(或者换个词叫“力量”),才能攻击成功。
我好像也跟你说过,这就看你是否相信市场。
因为你的话可以翻译成“这还要看市场是否有效”。
如果是你,会不会以低于 USD 的价格卖出 bitUSD?以高于 USD 的价格买入?
其实无论是 POW,还是 POS,还是共识机制,核心思想只有一个:那就是相信 mojority。
因为有正反馈强化作用,所以脱离 mojority 的一方总会受到向心力,被强行收敛。
也正是因为依赖 mojority,所以可以容忍单点失败,容错性好,可用性高,健壮。
于是群体行为“涌现”出来。于是“无形的手”降临。
而这不正是 DAC 的精髓?