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.
Common services
The common services are necessary for the proper execution of the evidence exchange process.