An escrow protocol for Bitcoin allows fair trading using bitcoins. To ensure fairness, the existing proposals made various trade-offs between trust, privacy, and efficiency. In this work, we evaluate the existing escrow protocols for cryptocurrency and propose a practical escrow protocol for Bitcoin that is: (a) computationally efficient; (b) round efficient; and (c) privacy-preserving. The core component of our escrow protocol for Bitcoin is a new verifiably encrypted ECDSA scheme, which may be of independent interest. Furthermore, we implement the escrow protocol for Bitcoin in Bitcoin mainnet, demonstrating the feasibility of our protocol.

中文翻译：

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比特币实用托管协议

比特币的托管协议允许使用比特币进行公平交易。为了确保公平，现有建议在信任，隐私和效率之间进行了各种折衷。在这项工作中，我们评估了现有的加密货币托管协议，并提出了一种适用于比特币的实用托管协议，该协议是：（a）计算效率高；（b）全面有效；（c）保护隐私。我们用于比特币的托管协议的核心组件是一种新的经过验证的加密ECDSA方案，该方案可能具有独立利益。此外，我们在比特币主网中实现了针对比特币的托管协议，证明了该协议的可行性。