回复：关于半自动托管机制的提议
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可以编写一笔要求两个签名才能在下一次花费的交易。你发起一笔付款，要求收款人和付款人双方都签名才能花费。要解除托管，你可以把属于你这一半的签名交给收款人；或者收款人也可以把他签过名的那一半交给你，从而退还款项。在这个简单的情形中没有中间人。唯一的追索方式是永远拒绝解除托管，实际上就是把钱烧掉。
英文原文
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A transaction can be written that requires two signatures to spend it next. You write a payment that requires the signature of both the recipient and the sender to spend it. To release the escrow, you give the recipient the signature for your half, or the payee can return it by giving you his signed half. There's no mediator in this simple case. The recourse is to refuse to ever release it, essentially burning the money.