Quellkern.com

Augenmaß won the Developer Tools category and the Community Prize at the EUDI Wallet Hackathon 2026

We build source-grounded systems.

Source-grounded means every claim a system makes can be traced back to a verifiable source, and no more data is asked for than the task needs. Quellkern builds such systems for digital identity and family stories, for the people and organisations that have to rely on them.

Quellkern e.U.

  • Tirol
  • Austria
  • est. 2026

Talk to us

[email protected] Open contact form

What we build

quellkern.com is the official home of Quellkern e.U. and the index of what we build. Each product has its own site; the links below lead there.

By Quellkern

Augenmaß

Audits the EUDI Wallet relying-party registry and flags parties that ask for more personal data than their declared purpose needs. augenmass.tech

Mindestmaß

Lets relying parties accept EUDI Wallet proofs with the minimum of personal data, so they verify what they need and receive nothing more. mindestmass.de

Attestat

Lets token issuers accept identity evidence from a customer's EUDI Wallet instead of storing a copy of the ID document, then applies their approval to the customer's linked crypto wallet. A demo on a test network. attestat.dev

With Old School GmbH · Bernd Lapp (former Ethereum Foundation advisor)

LoreLuna

Talks with grandparents, asks gently and listens. Every story is kept as a recording in their own voice and becomes a named star on the family's night sky that relatives can ask questions of. loreluna.com

For private clients

Technical Review

Evaluates a startup for a venture capital fund: a report with findings, a risk rating per dimension and questions for the founders, with no investment recommendation. Lately also covers quantum computing research. Clients are not named.

Method

Zettelkern

Our method for living knowledge: a wiki that maintains itself, where every claim is traced back to its source. It is how we work, and what source-grounded looks like in practice. zettelkern.com