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The payment channel, which allows two parties to perform micropaymentswithout involving the blockchain, has become a promising proposal to improvethe scalability of decentralized ledgers such as Bitcoin and Ethereum. Paymentchannels have been extended to the payment network, through which users canutilize existing channels as intermediary links to route coins to others.However, routing payments through multiple channels bears nontrivial overheads.It requires every intermediary channel to lock a portion of its availablecapacity until the payment is settled. This may lead to deadlock in aconcurrent situation. The intermediary nodes in a payment path may also chargefees for routing a payment. The longer the routing path, the more serious theabove problems.  In this paper, we design and develop a novel off-chain system to shorten therouting path for the payment network. In particular, we propose the channelhub, which is an extension of the payment hub, to allows transferring coinsdirectly from one payment channel to another within the same hub. That is, thechannel hub can be viewed as a shortcut device for the underlying paymentnetwork. We design a new protocol named Boros to perform secure off-chaincross-channel transfers through the channel hub. We not only present thesecurity definition of the Boros protocol formally but also prove its securityusing the UC-framework. To demonstrate the feasibility of the Boros protocol,we develop a proof-of-concept prototype running on the Ethereum. Our evaluationshows that our system can effectively shorten the off-chain routing path.

Boros: Secure Cross-Channel Transfers via Channel Hub