Blockchain and Distributed Ledger Technologies


Blockchain and other Distributed Ledger Technologies change the way we deal with the issue of trust, the basis for all business relations. This paradigm shift enables a digital future with novel governance of organizations and business models: abandon centrally and hierarchically organized trust services of middlemen, reallocate their tasks in a decentralized network and reward each participant for his contribution to the maintenance of a healthy ecosystem.

Our services

Knowledge Transfer

Understand the capabilities and limitations of distributed ledgers.

Technology Assessment

Deep dive into the world of Ethereum, Quorum, Hyperledger Fabric and more.

Solution Development

Develop future-proof smart contracts and decentralized applications.

Innovation Enablement

Ideate, evaluate and test prototypes of your blockchain use cases.

Network Architecture

Design and implement your private blockchain network.

Quality Assurance

Make sure your distributed ledger applications have no critical vulnerabilities.

Current projects

Enhancement of a Mobile Wallet

We participated in the joint review of the architecture with the goal to extend the wallet with scalable multi-currency support as well as in the development of the necessary feature extensions for enabling ETH and other Ethereum-based cryptocurrencies (ERC20 tokens). In the course of this development the mobile wallet was integrated with the Ethereum network using Infura and the web3j library and the new version of the user interface of the native Android app was redesigned providing e.g. real time exchange rates.

Consignment Planning and Tracking

We designed the blockchain layer of a decentralized platform for the transport industry. Participants in a consignment share their data enabling them to optimize the planning and utilization of their resources. All participants of the transport chain will be informed about delays occurred immediately and can adapt their resource planning accordingly in a timely manner. The consortium blockchain will be run and governed by the participating transport companies. Scalability of the number of validator nodes and the throughput as well as confidentiality of the transactions were key requirements. We evaluated Parity and Quorum as technology alternatives for an Ethereum-based approach as well as MultiChain, BigchainDB, NEM, Tendermint and Hyperledger Fabric as alternative solutions.

Tamper-Proof Service Level Agreements

We set up a hybrid blockchain for cloud and hosting providers and their clients for automating service credits. Monitoring data are transmitted directly to the blockchain. They can be observed by clients immediately and can’t be modified by service providers anymore. We have realized this using Hyperledger Fabric with a separate private channel for each client to keep data confidential. The service level agreements are implemented as smart contracts on the public Ethereum blockchain. They receive information about the actual availability of the corresponding cloud or hosting service from oracles based on data recorded in Hyperledger Fabric and calculate the service credits of the client automatically.

Decentralized Book Sharing Platform

We developed EtherLib, a peer-to-peer marketplace for monetizing books their owners do not need anymore. The books are passed on from reader to reader, each of them compensating a portion of the original purchase price. After a certain number of transfers, the price of a book is split among all readers. Smart contracts on Ethereum govern the marketplace and the frontend, an Ionic mobile app communicates with the Ethereum network using web3.js and the Google Books API to retrieve master data of the books.

DAO Framework for Cooperatives

In order to enable their members to participate in decisions of the general assembly more often than once a year, cooperatives need a cost-efficient and tamper-proof solution for virtual general assemblies conformable to law, using which members can contribute to decisions in a digital way from any location as often as desired. Our solution is a Decentralized Autonomous Organization (DAO) based on a blockchain. Smart contracts govern processes like the admission of new members, elections of board members as well as secret voting on petitions submitted by members. We have implemented the latter using traceable ring signatures and stealth addresses. They ensure non-linkability of votes cast, verifiability of the own vote of each member and confirmability of the result after closing the vote.

Blockchain in one day

All-day workshop to become acquainted with the most important blockchain concepts. We show you how P2P networks and different consensus algorithms work, practice the design and the development of smart contracts and evaluate use cases for your organization.

Blockchain in one day

All-day workshop to become acquainted with the most important blockchain concepts. We show you how P2P networks and different consensus algorithms work, practice the design and the development of smart contracts and evaluate use cases for your organization.

More about Blockchain (in German)


Was kommt nach der Blockchain? Teil 1: Einführung in IOTA

In dieser Blogserie geben wir einen tieferen Einblick in die Themen IOTA und Hashgraph und die dahinter liegenden Konzepte: IOTA – Einführung & IOTA –...


TL;DR: Smart Contracts für Eilige (Teil 2) - Blockchain Tutorial

Wir erinnern uns: In Teil 1 haben einen (mehr oder weniger) smarten Contract namens "Weisenheimer" in die Ethereum Test-Blockchain "Rinkeby"...


TL;DR: Smart Contracts für Eilige (Teil 1) - Blockchain Tutorial

Wenn Blockchains eine Art von verteilten Datenbanken sind, dann sind Smart Contracts ihre Stored Procedures. Sie bieten Funktionen an, die man...


Wie funktioniert eigentlich die Blockchain? Teil 4: Die Blockchain im Einsatz

In den ersten drei Teilen der Blogserie haben wir uns mit der Funktionsweise von Blockchains und Smart Contracts beschäftigt und sie am Beispiel einer...


Wie funktioniert eigentlich die Blockchain? Teil 3: Bookchain, die P2P-Bücherei auf der Ethereum Blockchain

Im zweiten Teil der Blogreihe über Blockchain ging es um Smart Contracts. In diesem Teil zeigen wir als Beispiel eine DApp, die wir mithilfe von Smart...


Wie funktioniert eigentlich die Blockchain? Teil 2: Smart Contracts, die Businesslogik von Blockchain-Anwendungen

Im ersten Teil der Blogserie über Blockchain haben wir uns mit der verteilten Datenhaltung, der Transaktionsverarbeitung und dem Consensus Mechanismus...


Wie funktioniert eigentlich die Blockchain? Teil 1: Die manipulationssichere verteilte Datenbank

Ich werde in letzter Zeit oft gefragt, was die Blockchain eigentlich ist und wie sie funktioniert. Die passende Antwort ist je nach technischem...

Dr. Zoltan Fazekas

Member of the Executive Board
Head of Blockchain education at University of Applied Sciences Vienna. More information.
+49 89 614551-0