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M. Borkowski, D. McDonald, C. Ritzer, S. Schulte:
"Towards Atomic Cross-Chain Token Transfers: State of the Art and Open Questions within TAST";
Report for White Paper for PANTOS; 2018; 10 pages.

Cryptocurrencies share a broad overall purpose, enabling distributed, decentralized and trustless transfers of value. Nevertheless, the various blockchains upon which each cryptocurrency is implemented remain, for the most part, unconnected. While approaches for atomic swaps (the secure exchange of tokens on one chain for another) are emerging,there is still no documented implentation of such a system that adheres to cryptocurrency´s orientation toward decentralisation
and trustlessness. In this paper, we propose the concept of atomic cross-chain token transfers, which will connect various blockchains, foster collaboration between various stakeholders, and to mitigate risk to end users of a specific blockchain.
This paper reviews the current state of the art, both in terms
of blockchains and atomic swap technologies. More specifically,
we survey twenty of the most prominent blockchains, as well as fourteen currently operational or forthcoming cryptocurrency systems, discussing their features and potential usability for atomic cross-chain token transfers. We then identify several open key challenges for such token transfers, and discuss potential directions of research.

http://dx.doi.org/10.13140/RG.2.2.10769.48489

Project Head Stefan Schulte:
TAST_2