A new EU Trust List format, TLv6, will officially replace TLv5 in May 2025 as part of the updated eIDAS Regulation (EU 2024/1183). It introduces key technical changes like a new URI field, updated signature format, and optional phone number support. Organizations must update their systems to avoid signature validation failures and service disruptions, as TLv5 will no longer be valid once TLv6 takes effect.
TLv6 Implementation Marks Significant Shift in EU’s Trust List Format
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Author: Ivana Picajkić
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Content accuracy validation date:
10.04.2025
Content accuracy validation time:
08:09h
A new version of the EU Trust List format is coming: TLv6. This change is part of the updated eIDAS Regulation (EU 2024/1183). It replaces the current format, TLv5, and brings some significant technical changes.
What is TLv6?
TLv6 is the updated format used across the EU to check and verify electronic signatures and seals. It helps applications and services confirm whether a qualified trust service provider (QTSP) is valid and trustworthy.
What’s new in TLv6?
Some technical updates include:
- New standard: Moves from ETSI TS 119 612 v2.1.1 to 3.1.,
- New URI field: Adds a “SupplyPoint” to help find services more easily,
- Optional phone number: You can now add a phone number in the electronic address,
- Updated signature format: Changes from XAdES BES to XAdES-BASELINE-B.
What should organizations do?
Any organization that works with the EU Trust List, such as public authorities, QTSPs, or technical teams, must update their systems before the new TLv6 format becomes mandatory.
Recommended actions include:
- Upgrading to a Digital Signature Service (DSS) version that supports TLv6 (e.g., 5.13.1, 6.0.1, 6.1.1, or 6.2),
- Applying all relevant patches or updates provided by their software vendors,
- Testing their systems to ensure compatibility with TLv6.
Organizations that fail to update in time may face the following issues:
- Signature validation failures for long-term or archive formats (LT/LTA),
- Inability to complete or extend digital signatures due to unrecognized attributes,
- Service disruptions in any application relying on Trust List data for verifying qualified trust services.
The new format is expected to become official in May 2025, with a 20-day grace period. Importantly, there will be no overlap, once TLv6 starts, TLv5 will no longer be valid.