Game theoretical analysis of Atomic Cross-Chain Swaps

Marianna Belotti 1 Stefano Moretti 2 Maria Potop-Butucaru 3, 4 Stefano Secci 1
1 CEDRIC - ROC - CEDRIC. Réseaux et Objets Connectés
CEDRIC - Centre d'études et de recherche en informatique et communications
2 LAMSADE - Laboratoire d'analyse et modélisation de systèmes pour l'aide à la décision
3 NPA - Networks and Performance Analysis
LIP6
4 LINCS - Laboratory of Information, Network and Communication Sciences
Abstract : In this paper we address the distributed cross-chain swap problem in the blockchain context where multiple parties exchange assets across multiple blockchains (e.g. trading Bitcoins for Litecoins or Ethers). We present the first framework allowing to characterize the equilibria of existing cross-chain swap protocols. We prove that following a swap protocol characterized by concurrent publishing of exchange contracts and snap (immediate) assets transfers is a Nash equilibrium. Furthermore, we prove that for protocols with sequential publishing and commitment of the assets transfers, following the prescribed protocol is a sub-game perfect equilibrium.
Keywords : Escrow Interoperability Atomic swap Blockchain technology
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Submitted on : Thursday, February 20, 2020 - 6:43:40 PM
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UNIV-DAUPHINE | INRIA | CEDRIC-CNAM | SORBONNE-UNIVERSITE | LIP6 | PSL | CNAM | CNRS | LARA | INSTITUT-TELECOM | UNIV-HESAM | SU-SCIENCES

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Marianna Belotti, Stefano Moretti, Maria Potop-Butucaru, Stefano Secci. Game theoretical analysis of Atomic Cross-Chain Swaps. [Research Report] Caisse des dépôts - Institut pour la recherche et Banque des territoires; CEDRIC laboratory, CNAM-Paris, France; Sorbonne Universites, UPMC University of Paris 6. 2019. ⟨hal-02414356v2⟩

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