回复：如何构建分布式比特币托管服务
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它还没有实现，但网络可以支持一笔需要两个签名的交易。这里有说明： http://bitcointalk.org/index.php?topic=750.0
它绝对比没有托管的直接付款更安全，但不如由人仲裁的托管好，前提是你足够信任那个人。
在这种托管中，骗子无法获胜，但你仍然有可能遭受损失。它至少消除了欺骗你的获利动机。卖家确信这笔钱已为他预留，而买家仍保有制衡手段：在完成交易之前，卖家还没有收到付款。
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It's not implemented yet, but the network can support a transaction that requires two signatures. It's described here: http://bitcointalk.org/index.php?topic=750.0
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.
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.