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.