OntoChain · Project

Blockchain-Based Trust and Reputation System for Verifying Online Services and Content

digitalTestedTRL 5

ontochain.ngi.eu

Imagine buying something online but having no way to know if the seller, the product description, or the reviews are genuine. OntoChain built a system that uses blockchain to create tamper-proof reputation scores and trust records for online services and data sources. Think of it like a publicly verifiable trust certificate that nobody — not even the platform owner — can fake or delete. The system also lets data owners control exactly who can access their information and under what conditions.

By the numbers

EUR 6,011,100

EU funding for development

consortium partners

countries involved

total deliverables produced

67%

industry partner ratio

SMEs in consortium

3 years

project duration (2020-2023)

The business problem

What needed solving

Online businesses lose revenue and trust when they cannot verify the quality of service providers, the credibility of data sources, or the identity of users in their ecosystem. Fake reviews, unauthorized data reuse, and opaque reputation systems cost platforms millions in fraud, chargebacks, and regulatory penalties. Companies need a way to establish verifiable, tamper-proof trust without relying on a single central authority that can be compromised or manipulated.

The solution

What was built

OntoChain built a blockchain-based ecosystem for trust verification, decentralized reputation scoring, and traceable content handling. Concrete outputs include 36 deliverables, with dedicated Application Experiments (technical and business proposals) and OntoChain Foundations (technical and business proposals) as demonstrated components.

Audience

Who needs this

Online marketplace operators fighting fake reviews and seller fraudFintech companies needing privacy-preserving identity verificationContent platforms requiring data provenance and licensing trackingEnterprise software vendors building trust layers into B2B platformsSupply chain companies needing verifiable product authenticity records

Business applications

Who can put this to work

Online Marketplaces & E-commerce

mid-size

Target: Platform operators running peer-to-peer marketplaces

If you are an online marketplace operator dealing with fake reviews, fraudulent sellers, and users who cannot verify service quality — this project developed a decentralized reputation system on blockchain that reveals hidden quality indicators of providers and services. Built across 9 partners in 7 countries with 67% industry involvement, the system creates tamper-proof trust scores that no single party can manipulate. This means fewer chargebacks, higher buyer confidence, and reduced fraud investigation costs.

Financial Services & Identity Verification

SME

Target: Fintech companies and digital identity providers

If you are a fintech company struggling with identity verification, KYC compliance, and controlling trust issuance within your ecosystem — this project built blockchain-based identity management and trust verification tools. The system balances privacy and trust so authorized parties can verify identities without exposing unnecessary personal data. With EUR 6,011,100 in EU funding and 36 deliverables produced, this gives you a privacy-preserving verification layer that reduces compliance costs while meeting data protection requirements.

Data & Content Services

any

Target: Companies managing data provenance and content licensing

If you are a content platform or data aggregator dealing with unclear data ownership, unauthorized reuse, and no way to trace how content gets handled — this project developed traceable content handling where data owners set privacy policies and only authorized parties can process data accordingly. The system was designed to be economically sustainable, ensuring operational costs stay below the value generated. This means transparent content licensing, automated policy enforcement, and auditable data trails.

Frequently asked

Quick answers

What would it cost to implement this trust system?

The project received EUR 6,011,100 in EU funding over 3 years as a Research and Innovation Action. Implementation costs for adopting the outputs would depend on integration scope, but the system was specifically designed to lower market entry barriers through minimal infrastructure costs and decentralized transaction management. Contact the consortium for licensing or integration pricing.

Can this scale to handle millions of transactions?

The project was built on distributed ledger technologies (Ethereum, Hyperledger Fabric, Stellar, and similar platforms) which are designed for scale. OntoChain specifically addressed economic sustainability, ensuring total value generated surpasses operational costs including electricity consumption. Based on available project data, large-scale production benchmarks are not publicly documented.

What is the IP situation — can we license this?

OntoChain was funded under Horizon 2020 as a Research and Innovation Action (RIA). IP is typically shared among the 9 consortium partners according to their grant agreement. The coordinator, European Dynamics Luxembourg SA, is a private SME and would be the primary contact for licensing discussions.

Does this meet GDPR and data privacy regulations?

The project explicitly designed its reputation and trust models to balance the trade-off between privacy and trust. The system ensures authorized parties process data according to the privacy policies set by data owners. This privacy-by-design approach aligns with GDPR principles, though specific certification would need verification with the consortium.

How long would integration take?

The project ran from September 2020 to August 2023 and produced 36 deliverables including technical and business proposals for both foundations and application experiments. Based on available project data, integration timelines would depend on your existing infrastructure, but the use of standard blockchain platforms like Ethereum and Hyperledger Fabric suggests compatibility with common enterprise tech stacks.

Can this work with our existing systems?

OntoChain was built on established distributed platforms including Ethereum, Hyperledger Fabric, Stellar, and Waves. The system uses semantic technologies and ontologies for interoperability. With 6 industry partners involved in development, the tools were designed for real-world integration rather than purely academic use.

Consortium

Who built it

The OntoChain consortium is strongly business-oriented: 6 out of 9 partners are from industry (67%), and all 6 industry partners are SMEs — signaling that this was built by companies that need to commercialize results to survive. The coordinator, European Dynamics Luxembourg SA, is a private SME with direct commercial incentives. The consortium spans 7 countries (Greece, France, Ireland, Italy, Luxembourg, Slovenia, UK), giving it broad European market coverage. With only 2 universities and no dedicated research organizations, the balance tilts heavily toward practical application rather than academic exploration. This composition suggests the outputs are closer to market-ready tools than typical research projects.

EUROPEAN DYNAMICS LUXEMBOURG SACoordinator · LU
IEXEC BLOCKCHAIN TECHparticipant · FR
EUROPEAN DYNAMICS ADVANCED INFORMATION TECHNOLOGY AND TELECOMMUNICATION SYSTEMS SAthirdparty · EL
ELLINOGERMANIKO EMPORIKO & VIOMICHANIKO EPIMELITIRIOparticipant · EL
F6S NETWORK IRELAND LIMITEDparticipant · IE
F6S NETWORK LIMITEDthirdparty · UK
ATHENS UNIVERSITY OF ECONOMICS AND BUSINESS - RESEARCH CENTERparticipant · EL
UNIVERZA V LJUBLJANIparticipant · SI

How to reach the team

European Dynamics Luxembourg SA (Luxembourg) — SME coordinator, reachable through the project website or CORDIS contact form

Order a report on this consortium See EUROPEAN DYNAMICS LUXEMBOURG SA profile →

Next steps

Talk to the team behind this work.

Want to explore how OntoChain's blockchain trust technology could solve your verification or reputation challenges? SciTransfer can connect you directly with the research team and help evaluate fit for your business case.

Order a report on this topic More in Digital & ICT