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Trusted, traceable and transparent ontological knowledge on blockchain

Project description

Trustworthy transactions of services and content

Innovative business models generate value, and part of it is fed back to the blockchain community as remuneration for their contribution of computational resources. The EU-funded NGI OntoChain project aims to enable trustworthy transactions of services and contents. The project will define innovative decentralised reputation models that reveal the hidden quality/types of services and credibility of data sources, keeping a balance between privacy and trust. The project will create reliable and traceable content where authorised parties can process data according to the policies of the data owners. OntoChain will demonstrate its potential to achieve trustworthy information exchange as well as trustworthy and transactional content handling in high impact domains, such as eHealth, eGovernment, eEducation, and eCommerce. Ultimately, it will build an economically sustainable ecosystem.


During the last years we are witnessing an ever increasing number of Internet-based marketplaces that capitalize on the unused capacity of assets they already possess, while consumers can receive services from their peers owning assets either for free or at a lower cost. At the same time, the emergence of cryptocurrencies and smart contracts have enabled new distributed application ecosystems, e.g. Ethereum, Hyperledger Fabric, Stellar, Waves, etc., where new services can be deployed with low-entry market barriers, due to minimal infrastructure costs and decentralized and secure transaction management. Innovative business models arise where part of the value generated by these distributed apps is fed back to the distributed blockchain community, as remuneration for their contribution of computational resources. Companies and organizations still require trust: they need to understand their user base, verify identity, manage digital assets, and control trust issuance within their ecosystem. To maximize the market impact of this new economic environment, OntoChain aims to enable trustworthy transactions of services and content. OntoChain will define innovative decentralized reputation models that reveal hidden quality and/or type of providers/services, or credibility of data sources, while adequately balancing the trade-off between privacy and trust. OntoChain will enable trustworthy and traceable content handling where authorized parties can process data according to the privacy policies of the data owners. At the same time, it will build an economically sustainable ecosystem, where the total value generated in the system, in terms of profit or well-being, surpasses the total operational costs in terms of electricity consumption. In order to sustain the user community, OntoChain will aim on fair sharing of the generated value among resource contributors and provide appropriate incentives to the user community for participation.

Call for proposal


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Sub call



Net EU contribution
€ 4 436 250,00
1466 Luxembourg

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The organization defined itself as SME (small and medium-sized enterprise) at the time the Grant Agreement was signed.

Luxembourg Luxembourg Luxembourg
Activity type
Private for-profit entities (excluding Higher or Secondary Education Establishments)
Total cost
€ 4 564 375,00

Participants (8)