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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实用的比特币托管协议


比特币托管协议允许使用比特币进行公平交易。为了确保公平，现有提案在信任、隐私和效率之间进行了各种权衡。在这项工作中，我们评估了现有的加密货币托管协议，并提出了一种实用的比特币托管协议，该协议具有以下特点：（a）计算效率高； (b) 回合效率； (c) 隐私保护。我们的比特币托管协议的核心组件是一种新的可验证加密 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比特币托管协议，证明了我们协议的可行性。