The Once Only Hub. Collaborate to build the first EU Data Space.
The Once Only Technical System (OOTS) is the first EU cross-domain data space for secure government-to-government data exchange.
To make OOTS a reality, the European Commission established the Once Only Hub (OOHUB), a space for implementors where they can discover and access all the services provided by the European Commission to implement the Once Only Technical System.
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Who's the HUB for?
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National coordination groups
Responsible for the implementation of OOTS in their member state.
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Competent authorities
The authorities which must allow their users to retrieve requested evidence using OOTS.
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Solution providers
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Technical documentation
The technical and operational specifications of the Once Only Technical System (OOTS), laid down in the Commission’s Implementing Regulation setting out the system, are complemented by detailed, non-binding technical design documents (TDDs) resulting from the common efforts of the Commission and Member States.
Chapter 1
Introduction - High Level Architecture
This chapter provides a high-level overview of the architecture of the Once-Only Technical System (OOTS) of the Single Digital Gateway (SDG) and serves as an introduction to all technical design documents.
Chapter 2
User Identification, Authentication and Record Matching
This chapter deepdives into the use and purpose of the eID Building Block and eIDAS attributes in the Once-Only Technical System to support user identification and authentication.
Chapter 1
Common services
This chapter provides the information model and technical documentation of the identified Common Services, which are the Data Service Directory, the Evidence Broker and the Semantic Repository.
Common services
The common services are necessary for the proper execution of the evidence exchange process.
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Service desk
The service desk helps Contributors get access to the Confluence and answers to any technical issues. Contributors are added to specific user groups which allow them to see the dedicated pages of the sub-groups they are working on.