Sector: Blockchain Awards

Aplicación: Large Corp

Empresa: Inetum España

Dalion is a collaborative, multi-sector project that aims to provide a decentralised identity service that gives users complete control over their personal data in a secure and trusted environment. The solution allows tedious forms to be filled in automatically, increasing satisfaction, improving the user experience and decreasing the abandonment rate. Since certified data is used, it improves data quality by avoiding errors due to manual data entry.


The project seeks to implement Alastria’s identity model by integrating it with existing applications and processes. Banca March, Banco Santander, BBVA, CaixaBank, Generali, Inetum, Línea Directa Aseguradora, MAPFRE, Repsol, Unicaja Banco and la Universidad Politécnica de Madrid drive the project.




Digital identity management has become a key part of digitisation and includes not only the basic identification data (name, surname, ID, etc.) but all the data that the user wants to manage digitally, such as qualifications, licences, address, employer, current accounts, insurance certificates, membership of sports clubs, etc.


The most notable problems are the difficulty for users to use the multiple existing solutions, including the number of username/password combinations to remember, the lack of privacy and the user’s limited control over his or her own data. For their part, organisations have to deal with costly user identification processes, which entail costly and repetitive verification processes, requiring physical tests and manual processes in many cases both in the initial acquisition and in the review processes to avoid erroneous or outdated data. Finally, the lack of regulation that is truly technology agnostic and allows for the incorporation of new technologies such as blockchain.


To meet these needs, Dalion has been built, an easy-to-use and secure digital identity solution that respects user privacy and is based on the Alastria ID model and the UNE 71307 standard. Dalion allows every citizen to manage their own data easily, securely, reliably and transparently using their mobile device. In this way, the user can control with whom, for what purpose and even when they share their data and facilitates secure access to any service through a unique identity management tool based on standards that facilitate interoperability.


Blockchain makes it easy for the issuer to sign credentials and subsequently revoke them if necessary, for the user to obtain and present credentials for a given purpose “with a click”, while the service provider can automatically verify the origin and validity of the credentials without the need to contact the issuer directly. The user also has an easily manageable list of all his credentials and a log of all submitted data from which he can request the “one-click” service provider to stop using the previously submitted data.




  • Multisectoral: Public-private initiative, with a potential reach of 30,000,000 users and open to other actors and sectors.
  • Multiple use cases: From issuing multiple credentials to presenting them to contract any service or carry out any procedure.
  • Interoperability: With other national and global approaches. Actually tested with other national projects. Deployable in any cloud provider or on-premise.
  • Financial Sandbox: First project to successfully pass the tests.
  • Public-private collaboration: The participation as observers of 6 public administrations at all levels and 2 universities is essential.




  • 11 entities of the highest relevance involved in the project.
  • 000,000 million potential users, current customers of Dalion’s partners in Spain.
  • Participation of 6 organisations from all levels of the Public Administration and 2 universities.
  • Successfully passing the tests of the Financial Sandbox, a controlled testing area of the Ministry of Economy and Digital Transformation.
  • Award of a tender from an autonomous administration and at least one programme of INCIBE’s Innovative Public Procurement.




  • The consensus algorithm used in a Blockchain network is a determining factor in reducing energy consumption. For example, a consensus algorithm such as PoW (Proof of Work) consumes a large amount of energy to mine the blocks. Therefore, the consensus algorithm used within the Project’s Blockchain network is the PoA (Proof of Authority) consensus algorithm.
  • Reduction in the use of paper because of the digitalisation of all types of formalities and procedures, both before public administrations and in companies.
  • There is also a reduction in costs (time/energy used) in the verification and validation of credentials, i.e., of the data handled.
  • On the users’ side, there is also a reduction in the time and energy (travel and printing of documents) used to carry out formalities and procedures, without any loss of legal effectiveness.


  • Red Blockchain Cliente Ethereum – Quorum
  • Nodo Blockchain propio
  • Smart Contracts – Solidity
  • Criptografía de curva Elíptica
  • Microservicios SpringBoot y Maven
  • Docker y Kubernetes
  • PostGreSQL
  • Cloud (AWS, Azure, GCP)
  • Android
  • Nuxt TS, Tailwind, Angular
  • Nexus
  • Redis


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