Welcome to the resource topic for 2022/1605
Title:
Sweep-UC: Swapping Coins Privately
Authors: Lucjan Hanzlik, Julian Loss, Sri AravindaKrishnan Thyagarajan, Benedikt Wagner
Abstract:Fair exchange (also referred to as atomic swap) is a fundamental operation in any cryptocurrency, that allows users to atomically exchange coins. While a large body of work has been devoted to this problem, most solutions lack on-chain privacy. Thus, coins retain a public transaction history which is known to degrade the fungibility of a currency. This has led to a flourishing line of related research on fair exchange with privacy guarantees. Existing protocols either rely on heavy scripting (which also degrades fungibility), do not support atomic swaps across a wide range currencies, or come with incomplete security proofs.
To overcome these limitations, we introduce Sweep-UC (Read as Sweep Ur Coins), the first fair exchange protocol that simultaneously is efficient, minimizes scripting, and is compatible with a wide range of currencies (more than the state of the art). We build Sweep-UC from modular subprotocols and give a rigorous security analysis in the UC-framework. Many of our tools and security definitions can be used in standalone fashion and may serve as useful components for future constructions of fair exchange.
ePrint: https://eprint.iacr.org/2022/1605
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