While increasingly more application-specific blockchains, or ledgers, are being implemented and deployed, exchanging information between these ledgers remains an open problem. Existing cross-ledger protocols (XLPs) exhibit a variety of limitations such as scalability, liveness, efficiency, among others. This paper proposes a new XLP, namely XLPN-22, which introduces a global topology for the consortium of ledgers to achieve better efficiency and scalability of cross-ledger data exchanges. In this work, we prove the safety and liveness of XLPN-22 and analyze its theoretical complexity. We also implement XLPN-22 on SciChain ledgers and evaluate it on up to 128 nodes, 8 ledgers, and 16,000 transactions. Experimental results show that XLPN-22 outperforms two baseline protocols, namely VLDB-20 and PODC-18, by 18--50\% and 64--84\%, respectively.
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