2 Search Results for "Fu, Weili"

Document
DOI: 10.4230/LIPIcs.AFT.2025.32
4-Swap: Achieving Grief-Free and Bribery-Safe Atomic Swaps Using Four Transactions

Authors: Kirti Singh, Vinay J. Ribeiro, and Susmita Mandal

Published in: LIPIcs, Volume 354, 7th Conference on Advances in Financial Technologies (AFT 2025)

Abstract
Cross-chain asset exchange is crucial for blockchain interoperability. Existing solutions rely on trusted third parties and risk asset loss, or use decentralized alternatives like atomic swaps, which suffer from grief attacks. Griefing occurs when a party prematurely exits, locking the counterparty’s assets until a timelock expires. Hedged Atomic Swaps mitigate griefing by introducing a penalty premium; however, they increase the number of transactions from four (as in Tier Nolan’s swap) to six, which in turn introduces new griefing risks. Grief-Free (GF) Swap reduces this to five transactions by consolidating assets and premiums on a single chain. However, no existing protocol achieves grief-free asset exchange in just four transactions. This paper presents 4-Swap, the first cross-chain atomic swap protocol that is both grief-free and bribery-safe, while completing asset exchange in just four transactions. By combining the griefing premium and principal into a single transaction per chain, 4-Swap reduces on-chain transactions, leading to faster execution compared to previous grief-free solutions. It is fully compatible with Bitcoin and operates without the need for any new opcodes. A game-theoretic analysis shows that rational participants have no incentive to deviate from the protocol, ensuring robust compliance and security.
Cite as

Kirti Singh, Vinay J. Ribeiro, and Susmita Mandal. 4-Swap: Achieving Grief-Free and Bribery-Safe Atomic Swaps Using Four Transactions. In 7th Conference on Advances in Financial Technologies (AFT 2025). Leibniz International Proceedings in Informatics (LIPIcs), Volume 354, pp. 32:1-32:22, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2025)

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@InProceedings{singh_et_al:LIPIcs.AFT.2025.32,
  author =	{Singh, Kirti and Ribeiro, Vinay J. and Mandal, Susmita},
  title =	{{4-Swap: Achieving Grief-Free and Bribery-Safe Atomic Swaps Using Four Transactions}},
  booktitle =	{7th Conference on Advances in Financial Technologies (AFT 2025)},
  pages =	{32:1--32:22},
  series =	{Leibniz International Proceedings in Informatics (LIPIcs)},
  ISBN =	{978-3-95977-400-0},
  ISSN =	{1868-8969},
  year =	{2025},
  volume =	{354},
  editor =	{Avarikioti, Zeta and Christin, Nicolas},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops.dagstuhl.de/entities/document/10.4230/LIPIcs.AFT.2025.32},
  URN =		{urn:nbn:de:0030-drops-247514},
  doi =		{10.4230/LIPIcs.AFT.2025.32},
  annote =	{Keywords: Atomic Swaps, Griefing, Bribery, HTLC}
}
Document
DOI: 10.4230/LIPIcs.ECOOP.2017.12
muPuppet: A Declarative Subset of the Puppet Configuration Language

Authors: Weili Fu, Roly Perera, Paul Anderson, and James Cheney

Published in: LIPIcs, Volume 74, 31st European Conference on Object-Oriented Programming (ECOOP 2017)

Abstract
Puppet is a popular declarative framework for specifying and managing complex system configurations. The Puppet framework includes a domain-specific language with several advanced features inspired by object-oriented programming, including user-defined resource types, ‘classes’ with a form of inheritance, and dependency management. Like most real-world languages, the language has evolved in an ad hoc fashion, resulting in a design with numerous features, some of which are complex, hard to understand, and difficult to use correctly. We present an operational semantics for muPuppet, a representative subset of the Puppet language that covers the distinctive features of Puppet, while excluding features that are either deprecated or work-in-progress. Formalising the semantics sheds light on difficult parts of the language, identifies opportunities for future improvements, and provides a foundation for future analysis or debugging techniques, such as static typechecking or provenance tracking. Our semantics leads straightforwardly to a reference implementation in Haskell. We also discuss some of Puppet’s idiosyncrasies, particularly its handling of classes and scope, and present an initial corpus of test cases supported by our formal semantics.
Cite as

Weili Fu, Roly Perera, Paul Anderson, and James Cheney. muPuppet: A Declarative Subset of the Puppet Configuration Language. In 31st European Conference on Object-Oriented Programming (ECOOP 2017). Leibniz International Proceedings in Informatics (LIPIcs), Volume 74, pp. 12:1-12:27, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2017)

Copy BibTex To Clipboard

@InProceedings{fu_et_al:LIPIcs.ECOOP.2017.12,
  author =	{Fu, Weili and Perera, Roly and Anderson, Paul and Cheney, James},
  title =	{{muPuppet: A Declarative Subset of the Puppet Configuration Language}},
  booktitle =	{31st European Conference on Object-Oriented Programming (ECOOP 2017)},
  pages =	{12:1--12:27},
  series =	{Leibniz International Proceedings in Informatics (LIPIcs)},
  ISBN =	{978-3-95977-035-4},
  ISSN =	{1868-8969},
  year =	{2017},
  volume =	{74},
  editor =	{M\"{u}ller, Peter},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops.dagstuhl.de/entities/document/10.4230/LIPIcs.ECOOP.2017.12},
  URN =		{urn:nbn:de:0030-drops-72656},
  doi =		{10.4230/LIPIcs.ECOOP.2017.12},
  annote =	{Keywords: configuration languages, Puppet, operational semantics}
}
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