KRAKEN Secure and privacy preserving platform (broKeRage And marKEt platform for persoNal data) aims to bring personal data sharing and trading at a level of maturity that does not yet exist, by leveraging on: i) the emerging paradigm of self-sovereign identity built upon a stack of distributed ledger technologies (multi-ledger) which ensures future compatibility with different specific blockchain implementations for identity management. It will provide a decentralized user-centric approach on personal data sharing and proving that it can incorporate the trust and security assurance levels deriving claims from national identity schemas (eIDAS-compliant); ii) tested data marketplace technologies which support data sharing as well as aggregated data sharing; iii) A set of different data protection techniques based on advanced crypto tools (P/F/HE, FE, MPC, ABE…) coupled with privacy preserving (AI/ML) analytics, featuring management of privacy / utility trade-offs and metadata privacy. iv) The project will provide market-ready tools and services with industrial strength and suitable privacy metrics that will be conveyed to data subjects with high usability. Taking advantages of the emergent models and lessons learned from previous experiences, including existing and mature cloud-based personal data platforms CREDENTIAL and MHMD, as well as Streamr marketplace services, Kraken proposes an unprecedented approach, which creates an alternative to mainstream paradigms while fully granting the privacy and self-sovereignity of the data subject. KRAKEN enables advanced, convenient data sharing control relying on innovative end-to-end encryption and use of sophisticated proxy cryptography schemes grants data subjects with unprecedented control over their data. Furthermore, this ensures that even the cloud provider (data processor) cannot access the data in plain-text and hence protect access to personal data. KRAKEN involves 10 partners and has a duration of 3 years.