GDPR-Compliant Sharded Blockchain

Le descriptif de l’offre ci-dessous est en Anglais

Type de contrat : CDD

Contrat renouvelable : Oui

Niveau de diplôme exigé : Bac + 5 ou équivalent

Autre diplôme apprécié : PhD

Fonction : Ingénieur scientifique contractuel

A propos du centre ou de la direction fonctionnelle

The Inria Rennes - Bretagne Atlantique Centre is one of Inria's eight centres and has more than thirty research teams. The Inria Center is a major and recognized player in the field of digital sciences. It is at the heart of a rich R&D and innovation ecosystem: highly innovative PMEs, large industrial groups, competitiveness clusters, research and higher education players, laboratories of excellence, technological research institute, etc.

Contexte et atouts du poste

This development project lies in the context of the PriCLeSS Proof-of-Concept action ( led by Davide Frey (WIDE team) and funded by the Cominlabs LabEX ( The PriCLeSS project establishes a cross-disciplinary partnership to understand the legal challenges and address the technical

obstacles associated with data storage in a blockchain context.

From a technical perspective, the project focuses on designing algorithmic responses to the legal issues that arise when using blockchain technology to handle personal data.

In this context we first proposed Splitchain, a novel fully decentralized state-sharding solution that does not require the maintenance of a synchronization blockchain or any heavy synchronization mechanisms, allowing shards to progress at their own pace in a non-blocking manner. Then, we augmented SplitChain with the ability to enforce geographical or administrative constraints in the placement of data thereby addressing some of the requirements of privacy legislation like the GDPR. We refer to this augmented version as SplitChain2.


Mission confiée

This engineering position involves implementing first SplitChain and then SplitChain2. In this task the engineer will be guided by the team who have been working on SplitChain and SplitChain2 consisting of Antoine Rault, Davide Frey and Emmanuelle Anceaume from Inria, and Damien Franchi and Sandrine Turgis from the IODE Team at the University of Rennes. The engineer will also have the opportunity to collaborate with other partners from the PriCLeSS project.


Principales activités

The engineer will follow the following approximate timeline.

  • M1-M2: Analysis of the state of the art:
    • Sharding and Proof-of-Eligibility consensus implementations.
    • Research paper on SplitChain
    • Current working Draft on SplitChain2
  • M3: High-level design of the implementation.
  • M5: Single shard implementation, with features for multiple shards and privacy (indirection, encryption, etc.).
  • M8: Hypercube routing for inter-shard communication.
  • M12: Prototype implementation of the complete system.



  • Proficiency in Rust or willingness to learn the language and use it.
  • At least basic terminal usage: bash or other environments
  • Familiarity with git

Non technical:

  • Fluent written and spoken English
  • French can be a plus
  • Ability to work in a team
  • Flexibility
  • Planning and ability to meet deadlines




  • Subsidized meals
  • Partial reimbursement of public transport costs
  • Possibility of teleworking (90 days per year) and flexible organization of working hours
  • Partial payment of insurance costs