News

19.08.2021

We are happy to announce that the paper "Towards Cross-Blockchain Smart Contracts" by Markus Nissl, Emanuel Sallinger, Stefan Schulte, and Michael Borkowski has been accepted as a full paper at the 3rd IEEE International Conference on Decentralized Applications and Infrastructures. Within this paper, we present a first approach to provide interoperability between smart contracts running in different Ethereum Virtual Machines.

The paper is available as a preprint.

Abstract:

In recent years, manifold blockchain protocols have been proposed by researchers and industrial companies alike. This has led to a very heterogeneous blockchain landscape. Accordingly, it would be desirable if blockchains could interact with each other. However, current blockchain technologies offer only limited support for interoperability, thus preventing tokens or smart contracts from leaving the scope of a particular blockchain.

As a first step towards a solution for cross-chain smart contract interactions, we introduce a framework which allows to invoke a smart contract from another blockchain. We offer support for continuing a smart contract after receiving a result from a different blockchain, and for calling smart contracts recursively across blockchains. We provide a reference implementation for Ethereum-based blockchains using Solidity and evaluate the performance regarding time and cost overheads.

30.07.2021

Stefan Schulte gave a presentation on DLT Interoperability: Relays and Other Solutions at the IOTA Research Symposium 2021. During his presentation, he presented some general information about CDL-BOT, and then introduced the different ways how to "tear down the walls" between closed-world DLTs. A recording of the presentation can be found at Youtube.

21.07.2021

The Christian Doppler Laboratory for Blockchain Technologies for the Internet of Things (CDL-BOT) offers Postdoc and PhD positions at Hamburg University of Technology (TUHH).

The selected researchers will work at the newly established Institute of Data Engineering at TUHH under the supervision of Prof. Stefan Schulte. The main goal of these positions is to research and develop the next generation of blockchain interoperability concepts and solutions, e.g., in the areas of token transfer, data access, and smart contracts. The research aims at providing fundamental research results in the area of blockchain interoperability, which can also be applied in practical settings.

The positions are employed full-time by TU Hamburg, with an initial term of one year. An extension of the contracts to four years is foreseen.

Qualification
For the PhD student position, a very good Diploma or Master university degree in computer science, informatics, business informatics, mathematics, or a related discipline is expected. For the Postdoc position, a very good PhD in computer science, informatics, business informatics, or a related discipline is expected.

We offer

  • The chance to pursue your research (theoretical and experimental) within a young and international team, which is delivering very important contributions to blockchain and Internet of Things research.
  • Continuing personal and professional education.
  • The possibility to present your research results at international top conferences.
  • The opportunity for stays abroad at international partner universities.
  • To become part of a creative team at an aspiring university and in one of the most livable cities in the world.
  • A highly competitive salary. Entry level salaries as a PhD student are at a minimum of 4050 € per month (gross; 12 times per year), for a Postdoc at a minimum of 4600 € per month (gross; 12 times per year; depending on the previous experience). The salaries are following the German TV-L 13 scheme.

We expect

  • In-depth interest in scientific problems and the motivation for independent and goal-oriented research.
  • The ability to develop methods, concepts, and models, as well as their realization and evaluation and the willingness to contribute to scientific projects.
  • The willingness to contribute to an industry-oriented scientific project aiming at fundamental research results.
  • Very good programming skills.
  • Very good knowledge about and passion for distributed systems.
  • Knowledge in blockchain technology or cryptography is a plus.
  • Very good scientific communication and writing skills.
  • Very good knowledge in English communication and writing.

Please direct your complete application pack - including a motivation letter, a current CV, academic transcripts and certificates, and a digital copy of your latest thesis (either Master or PhD) - to stefan.schulte@tuhh.de. Applications from female candidates are highly encouraged. The preferred starting date is October 2021, but a later start is also possible.

Deadline for applications: August 15th, 2021. For further information please contact Prof. Stefan Schulte (stefan.schulte@tuhh.de) and see www.cdl-bot.at/en.

31.05.2021

The head of CDL-BOT, Stefan Schulte, has been interviewed for the latest issue of "Wien Wissen", talking about the usage of blockchains in the Internet of Things. Please find the resulting article on blockchain research at TU Wien at https://club.wien.at/static/ePaper/WIEN-WISSEN-2021-01/index.html#/4. Unfortunately, the article is only available in German.

04.05.2021

On May 4th, 2021, Stefan Schulte, head of CDL-BOT, participated in the Panel Discussion on Cross Chain Operations at the IEEE International Conference on Blockchain and Cryptocurrency. Within the panel, Stefan discussed with Peter Robinson (ConsenSys & The University of Queensland), Ying Xue (Brown University), and Raghvendra Ramesh (ConsenSys) current trends and future developments in the field of blockchain interoperability. The panel was moderated by David Hyland-Wood (Bits-Core).

29.04.2021

Talk at the Austrian Blockchain Center

On 29.04.2021, Stefan Schulte (CDL-BOT), Christof Spanring, and Philip Gahler (both from Pantos GmbH) gave a presentation at the Austrian Blockchain Center Talk series to an audience of roundabout 300 listeners. Within the presentation, a general overview of interoperability issues and solution approaches in the realm of Distributed Ledger Technologies were presented. Also, the application of interoperability solutions was discussed. A video from the talk can be found at Youtube.

26.11.2020

Inauguration of the Christian Doppler Laboratory

The Christian Doppler Laboratory Blockchain Technologies for the Internet of Things has been inaugurated today. Because of the ongoing Corona pandemic, the opening had to take place online. An audience of more than 650 people watched speeches by Austria's Minister of Digital and Economic Affairs, Dr. Margarete Schramböck, the rector of TU Wien, Dr. Sabine Seidler, the head of the Christian Doppler Laboratory, Dr.-Ing. Stefan Schulte, as well as Dominik Schiener (Co-Founder IOTA) and Eric Demuth (CEO Bitpanda and Pantos).

06.11.2020

Best Paper Award at IEEE Blockchain 2020

Congratulations to Tamara Brandstätter, Stefan Schulte, Jürgen Cito and Michael Borkowski for winning the Best Paper Award for their paper "Characterizing Efficiency Optimizations in Solidity Smart Contracts" at the 3rd IEEE International Conference on Blockchain.

Paper Download
04.11.2020

Presentation of 2 Research Papers at IEEE Blockchain 2020

The papers "Characterizing Efficiency Optimizations in Solidity Smart Contracts" and "ETH Relay: A Cost-Efficient Relay for Ethereum-Based Blockchains" have been presented by Dr.-Ing. Stefan Schulte at the 3rd IEEE International Conference on Blockchain. This conference is the top conference in the blockchain research field, with an acceptance rate of 16% in 2020.

01.11.2020

Official start of CDL-BOT

We are very happy to announce that today, the Christian Doppler Laboratory Blockchain Technologies for the Internet of Things (CDL-BOT) has started. We want to thank our partners Pantos and IOTA as well as the Christian Doppler Research Association for their support. We are looking forward to do groundbreaking research in the field of blockchains and other Distributed Ledger Technologies (DLTs) for the IoT.