Record link: 
http://hdl.handle.net/20.500.12708/230803
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Title: 
X-Transfer: Enabling and Optimizing Cross-PCN Transactions
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Citation: 
Aumayr, L., Avarikioti, Z., Salem, I., Schmid, S., & Yeo, M. (2026). X-Transfer: Enabling and Optimizing Cross-PCN Transactions. In C. Garman & P. Moreno-Sanchez (Eds.), Financial Cryptography and Data Security : 29th International Conference, FC 2025, Miyakojima, Japan, April 14–18, 2025, Revised Selected Papers, Part I (pp. 73–90). Springer. https://doi.org/10.1007/978-3-032-07024-1_5
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Publisher DOI: 
10.1007/978-3-032-07024-1_5
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Publication Type: 
Inproceedings - Full-Paper Contribution
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Language: 
English
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Authors: 
Aumayr, Lukas 
Avarikioti, Zeta 
Salem, Iosif 
Schmid, Stefan 
Yeo, Michelle 
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Organisational Unit: 
E192-06 - Forschungsbereich Security and Privacy 
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Published in: 
Financial Cryptography and Data Security : 29th International Conference, FC 2025, Miyakojima, Japan, April 14–18, 2025, Revised Selected Papers, Part I 
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ISBN: 
978-3-032-07023-4
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Volume: 
15751
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DOI of the book: 
10.1007/978-3-032-07024-1
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Date (published): 
2-Feb-2026
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Event name: 
29th International Conference on Financial Cryptography and Data Security (FC'25) 
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Event date: 
14-Apr-2025 - 18-Apr-2025
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Event place: 
Miyakojima, Japan
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Number of Pages: 
18
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Publisher: 
Springer, Cham
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Peer reviewed: 
Yes
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Keywords: 
cryptocurrencies; interoperability; Layer-2; optimization; Payment channel networks; transaction aggregation
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Abstract: 
Blockchain interoperability solutions allow users to hold and transfer assets among different chains, and in so doing reap the benefits of each chain. To fully reap the benefits of multi-chain financial operations, it is paramount to support interoperability and cross-chain transactions also on Layer-2 networks, in particular payment channel networks (PCNs). Nevertheless, existing works on Layer-2 interoperability solutions still involve on-chain events, which limits their scalability and throughput. In this work, we present X-Transfer, the first secure, scalable, and fully off-chain protocol that allows payments across different PCNs. We formalize and prove the security of X-Transfer against rational adversaries with a game theoretic analysis. In order to boost efficiency and scalability, X-Transfer also performs transaction aggregation to increase channel liquidity and transaction throughput while simultaneously minimizing payment routing fees.
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Project title: 
Semantische und kryptografische Grundlagen von Informationssicherheit und Datenschutz durch modulares Design: F 8500 (FWF - Österr. Wissenschaftsfonds) 
Ein zusammensetzbarer rationaler Rahmen für Blockchains: ESP 68-N (FWF - Österr. Wissenschaftsfonds) 
Scalable, Private, and Interoperable Layer 2: ICT22-045 (WWTF Wiener Wissenschafts-, Forschu und Technologiefonds) 
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Project (external): 
Data-Driven Distributed Algorithms
German Research Foundation (DFG)
through their funding of the Edinburgh Blockchain Technology Lab
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Project ID: 
MOE-T2EP20122-0014
grant SPP 2378 (ReNO)
Input Output
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Research Areas: 
Logic and Computation: 100%
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Science Branch: 
1020 - Informatik: 100%
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