Decentralized ledger technology (DLT), in particular blockchain, is
becoming ubiquitous in today’s society. Just in the second quarter of
2021, centralized and decentralized exchanges had a volume of around
$600 billion. Enterprises are adopting this technology, following the
opportunity to expand to new businesses. However, they need to connect
their existing systems and processes to blockchains securely and
reliably. Blockchain interoperability (BI) is emerging as one of the
crucial features of blockchain technology. Fueled by the need to
eliminate data and value silos, they realize the necessary bridge
between centralized and decentralized systems.
As BI is still maturing, there are many unsolved challenges. In
particular, it is still difficult for developers and practitioners to
have control over processes spawning across several DLTs.
In this report, we focus on the problem of managing cross-chain state in
an integrated manner. First, we introduce the concept of cross-chain
logic/cross-chain rules. After that, we present and discuss the results
of our BI survey. Finally, we propose the BI evaluation framework, the
first step to systematically evaluate BI solutions.