Welcome to the resource topic for 2025/1554
Title:
UniCross: A Universal Cross-Chain Payment Protocol with On-demand Privacy and High Scalability
Authors: Chenke Wang, Yu Long, Xian Xu, Shi-Feng Sun, Yiqi Liu, Dawu Gu
Abstract:Cross-chain payment technologies have obtained broad affirmation from industry and academia as they enable assets to be circulated across the boundaries of various blockchains. However, existing cross-chain payment protocols are tailored for limited blockchains, inflexible in providing privacy guarantees, and unsatisfactory in scalability.
To address these issues, this paper proposes a universal cross-chain payment framework. This framework enables payments across a wide range of blockchains since it is independent of any specific blockchain features. Moreover, this framework provides on-demand privacy and high scalability. To instantiate the framework, we introduce \mathsf{UniCross}, a novel universal cross-chain payment protocol. Concretely, we utilize the ring learning with errors (RLWE)-based encryption scheme and propose a new non-interactive zero-knowledge (NIZK) protocol, named \mathsf{HybridProof}, to construct \mathsf{UniCross}. We formally define the security of the universal cross-chain payment framework and prove the universal composability (UC) security of \mathsf{UniCross}. The proof-of-concept implementation and evaluation demonstrate that (1) \mathsf{UniCross} consumes up to 78% and 94% less communication and computation cost than the state-of-the-art work; (2) \mathsf{UniCross} achieves a throughput ($\sim$360 tps) 36$\times$ that of the state-of-the-art work ($\sim$10 tps).
ePrint: https://eprint.iacr.org/2025/1554
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