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G. Scaffino, S. Schulte, M. Sober, C. Spanring:
"A Voting-Based Blockchain Interoperability Oracle";
in: "4th IEEE Blockchain 2021", IEEE, 2020.

Today´s blockchain landscape is severely fragmented
as more and more heterogeneous blockchain platforms have been
developed in recent years. These blockchain platforms are not
able to interact with each other or with the outside world since
only little emphasis is placed on the interoperability between
them. Already proposed solutions for blockchain interoperability
such as naive relay or oracle solutions are usually not broadly
applicable since they are either too expensive to operate or very
resource-intensive.
For that reason, we propose a blockchain interoperability
oracle that follows a voting-based approach based on threshold
signatures. The oracle nodes generate a distributed private key
to execute an off-chain aggregation mechanism to collectively
respond to requests. Compared to state-of-the-art relay schemes,
our approach does not incur any ongoing costs and since the
on-chain component only needs to verify a single signature, we
can achieve remarkable cost savings compared to conventional
oracle solutions

blockchain interoperability, blockchain oracles, threshold signature, smart contracts

https://publik.tuwien.ac.at/files/publik_299810.pdf