尚未实现，但网络能支持要求两个签名的交易。它在这里有描述：
It's not implemented yet, but the network can support a transaction that requires two signatures. It's described here:
它绝对比没有托管的直接支付更安全，但不如人工仲裁的托管好——前提是你足够信任那个人。
It's absolutely safer than a straight payment without escrow, but not as good as a human arbitrated escrow, assuming you trust the human enough.
在这种托管里，骗子赢不了，但你仍然可能吃亏。它至少消除了骗你的利润动机。卖方得到保证：钱是留给他的；买方也保留着制约卖方的手段：交易完成之前，卖方还拿不到钱。
In this kind of escrow, a cheater can't win, but it's still possible for you to lose. It at least takes away the profit motive for cheating you. The seller is assured that the money is reserved for him, while the buyer retains the leverage that the seller hasn't been paid yet until completion.
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