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\begin{document}

\title{Securing Cross-Chain Asset Transfers on Permissioned Blockchains}



\author[1]{Catarina Pedreira }%
\author[2,2,2]{Rafael Belchior }%
\author[1]{Miguel Matos }%
\author[1]{André Vasconcelos }%
\affil[1]{Affiliation not available}%
\affil[2]{Técnico Lisboa}%


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  \date{June 14, 2024}


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\begin{abstract}
Blockchains currently exist in silos, competing when they could be
cooperating. Interoperability is essential to allow for communication
between them and motivate mass adoption. In permissioned blockchains,
interoperability is harder given their opaqueness. The solutions
proposed so far to address interoperability require a trusted private
third party, which may be insecure and is not ideal. We propose T-ODAP,
a secure multi-layered protocol that enables a trustless solution for
permissioned blockchain interoperability, eliminating the need for trust
in the protocol's participants. It provides a Decentralized View
Storage, a connector that connects permissioned blockchains to the
latter, and a trustless version of the ODAP protocol. T-ODAP models the
participants as rational agents using game theory techniques and is
implemented using \textbackslash{}textit\{Polkadot\} and
\textbackslash{}textit\{Hyperledger Cactus\}. We tested the implemented
solution, evaluated the system's robustness in face of attacks, and
concluded that the system is
\textbackslash{}textit\{(k,t)-weak-robust\}.%
\end{abstract}%



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