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The PreserveEU system is a digital preservation solution to ensure the long-term validity, integrity, and authenticity of electronically signed documents. Instead of applying multiple timestamps to each document (as in traditional extension methods), it leverages a Merkle Tree (Hash Tree) structure to efficiently group document hashes and preserve them collectively.

By combining cryptographic hashing and trusted timestamps, PreserveEU offers a scalable, secure, and cost-efficient way to maintain compliance and protect digital evidence for decades.

Metadata validation service used by Cellar

A source code of Cellar, which is a service and data repository that manages large amounts of EU legal content, publications and reference datasets and serves as the central dissemination repository of the Publication Office.