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Paper Abstract and Keywords
Presentation 2026-08-07 09:40
Analysis and Design Theory of Secure Asset Transfer Time in Cross-Chain Bridges -- Design Guidelines Based on Finality Time and Trust Models in the Polygon PoS Bridge --
Akihiro Fujihara (Chiba Tech), Tao Yan, Claudio J. Tessone (UZH) IN2026-28
Abstract (in Japanese) (See Japanese page) 
(in English) Cross-chain bridges are essential infrastructure for enabling secure asset transfers between heterogeneous blockchains.
However, decentralized-trust bridges must wait for the finality of the source chain to prevent cross-chain double spending, resulting in significant transfer latency.
This study theoretically and empirically analyzes the relationship between secure asset transfer latency and the number of source-chain validators by combining real Polygon PoS Bridge transfer data with a mathematical model of Ethereum finality time.
The results demonstrate that secure asset transfer latency is strongly governed by the finality time of the source blockchain and increases as the number of validators grows.
Based on these findings, we show that source-chain finality constitutes an inherent lower bound on the transfer performance of decentralized-trust bridges and derive a design theory for cross-chain bridges.
As a concrete realization of this design theory, we propose a fast asset transfer scheme based on trusted third parties and a guarantee pool, and discuss design guidelines for balancing security and processing performance.
Keyword (in Japanese) (See Japanese page) 
(in English) Blockchain / Cross-Chain Interoperability / Bridge / Asset Transfer / Finality Time / Trust Model / /  
Reference Info. IEICE Tech. Rep., vol. 126, no. 144, IN2026-28, pp. 90-95, Aug. 2026.
Paper # IN2026-28 
Date of Issue 2026-07-30 (IN) 
ISSN Online edition: ISSN 2432-6380
Copyright
and
reproduction		 All rights are reserved and no part of this publication may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopy, recording, or any information storage and retrieval system, without permission in writing from the publisher. Notwithstanding, instructors are permitted to photocopy isolated articles for noncommercial classroom use without fee. (License No.: 10GA0019/12GB0052/13GB0056/17GB0034/18GB0034)
Download PDF IN2026-28

Conference Information
Committee IN CCS  
Conference Date 2026-08-06 - 2026-08-07 
Place (in Japanese) (See Japanese page) 
Place (in English) Sapporo Educaton and Culture Hall 
Topics (in Japanese) (See Japanese page) 
Topics (in English) Network Science, Future Network, Cloud/SDN/Virtualization, Contents Delivery/Contents Exchange, and others 
Paper Information
Registration To IN 
Conference Code 2026-08-IN-CCS 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Analysis and Design Theory of Secure Asset Transfer Time in Cross-Chain Bridges 
Sub Title (in English) Design Guidelines Based on Finality Time and Trust Models in the Polygon PoS Bridge 
Keyword(1) Blockchain  
Keyword(2) Cross-Chain Interoperability  
Keyword(3) Bridge  
Keyword(4) Asset Transfer  
Keyword(5) Finality Time  
Keyword(6) Trust Model  
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Keyword(8)  
1st Author's Name Akihiro Fujihara  
1st Author's Affiliation Chiba Institute of Technology (Chiba Tech)
2nd Author's Name Tao Yan  
2nd Author's Affiliation University of Zurich (UZH)
3rd Author's Name Claudio J. Tessone  
3rd Author's Affiliation University of Zurich (UZH)
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Speaker Author-1 
Date Time 2026-08-07 09:40:00 
Presentation Time 25 minutes 
Registration for IN 
Paper # IN2026-28 
Volume (vol) vol.126 
Number (no) no.144 
Page pp.90-95 
#Pages 6 
Date of Issue 2026-07-30 (IN) 

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