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Payment channel networks (PCN) are used in cryptocurrencies to enhance theperformance and scalability of off-chain transactions. Except for opening andclosing of a payment channel, no other transaction requests accepted by a PCNare recorded in the Blockchain. Only the parties which have opened the channelwill know the exact amount of fund left at a given instant. In real scenarios,there might not exist a single path which can enable transfer of high valuepayments. For such cases, splitting up the transaction value across multiplepaths is a better approach. While there exists several approaches which routetransactions via several paths, such techniques are quite inefficient, as thedecision on the number of splits must be taken at the initial phase of therouting algorithm (e.g., SpeedyMurmur [42]). Algorithms which do not considerthe residual capacity of each channel in the network are susceptible tofailure. Other approaches leak sensitive information, and are quitecomputationally expensive [28]. To the best of our knowledge, our proposedscheme HushRelay is an efficient privacy preserving routing algorithm, takinginto account the funds left in each channel, while splitting the transactionvalue across several paths. Comparing the performance of our algorithm withexisting routing schemes on real instances (e.g., Ripple Network), we observedthat HushRelay attains a success ratio of 1, with an execution time of 2.4 sec.However, SpeedyMurmur [42] attains a success ratio of 0.98 and takes 4.74 secwhen the number of landmarks is 6. On testing our proposed routing algorithm onthe Lightning Network, a success ratio of 0.99 is observed, having an executiontime of 0.15 sec, which is 12 times smaller than the time taken bySpeedyMurmur.

HushRelay: A Privacy-Preserving, Efficient, and Scalable Routing Algorithm for Off-Chain Payments