CryptoMaze: Privacy-Preserving Splitting of Off-Chain Payments

【Author】 Mazumdar, Subhra; Ruj, Sushmita

【Source】IEEE TRANSACTIONS ON DEPENDABLE AND SECURE COMPUTING

【影响因子】6.791

【Abstract】Payment Channel Networks or PCNs solve the problem of scalability in Blockchain by executing payments off-chain. Due to a lack of sufficient capacity in the network, high-valued payments are split and routed via multiple paths. Existing multi-path payment protocols either fail to achieve atomicity or are susceptible to wormhole attack. We propose a secure and privacy-preserving atomic multi-path payment protocol CryptoMaze. Our protocol avoids the formation of multiple off-chain contracts on edges shared by the paths routing partial payments. It also guarantees unlinkability between partial payments. We provide a formal definition of the protocol in the Universal Composability framework and analyze the security. We implement CryptoMaze on several instances of Lightning Network and simulated networks. Our protocol requires 11s for routing a payment of 0.04 BTC on a network instance comprising 25600 nodes. The communication cost is less than 1MB in the worst-case. On comparing the performance of CryptoMaze with several state-of-the-art payment protocols, we observed that our protocol outperforms the rest in terms of computational cost and has a feasible communication overhead.

【Keywords】Blockchain; layer 2 protocols; payment channels; payment channel networks; wormhole attack; atomic multi-path payment; privacy; unlinkability; bitcoin; lightning network

【发表时间】2023 MAR-APR

【收录时间】2023-05-25

【文献类型】实验仿真

【主题类别】

区块链技术-协同技术-隐私保护