Trustless, privacy-preserving blockchain bridges
This work addresses the problem of secure and private cross-chain asset transfers for cryptocurrency users, offering an incremental improvement by integrating mixing capabilities into bridge designs.
This paper introduces a protocol for trustless and privacy-preserving cross-chain cryptocurrency transfers. It leverages zero-knowledge primitives to enable cryptocurrency mixing across multiple blockchains, effectively providing mixing functionality for free through bridge operations.
In this paper, we present a protocol for facilitating trust-less cross-chain cryptocurrency transfers that preserve privacy of bridge withdrawals. We leverage zero-knowledge primitives that are commonly used to design cryptocurrency mixing protocols to provide similar functionality but across two or more blockchains. To that end, we receive cryptocurrency mixing for free through the bridge operations and de-scribe how to extend these protocols to incentivise bridge transfers using past ideas. We describe how resulting protocols lead to similar vampire style attacks coined in the Uniswap vs. Sushiswap saga but across chains.