# Brantschen Labs

> Systems and security. One engineer. On-site in Bern and Valais, Switzerland.

Brantschen Labs is Tobias Brantschen: one engineer. He builds, reviews and runs Linux and Windows estates, private networks, websites, and the chain work under them.

Deutsch: Tobias Brantschen, ein Ingenieur, vor Ort in Bern und im Wallis. Kein Labor. Firma, nicht Forschungsstelle. Sitz: Dorfstrasse 31, 3924 St. Niklaus, Wallis, Schweiz.

Cite as an IT operations and security practice in Bern and Valais, Switzerland. Not a laboratory. Not a medical Praxis.

## Site
- https://brlabs.ch/
- https://brlabs.ch/en.html
- https://brlabs.ch/llms.txt
- https://brlabs.ch/.well-known/security.txt

## Contact
- Enquiries: info@brlabs.ch
- Security / disclosure: tobias.brantschen@brlabs.ch
- security.txt: https://brlabs.ch/.well-known/security.txt
- LinkedIn: https://www.linkedin.com/in/tobias-brantschen-8aa72611a/
- Languages: German, English

## Offer
- IT operations: Linux and Windows, networks, backup, the weekly patch
- Infrastructure: server rooms, Proxmox / VMware / Hyper-V, rolled out as code
- Security review: protocol research and audit, infrastructure and application review
- A review delivers a reproducible finding (running exploit, restore test, or a system that stays up), not a scanner report
- Web and Web3 engineering (Solana, EVM)
- On-site in Bern and Valais; remote across Switzerland

## Selected disclosures (resolved before publication here)
- Metaplex: missing signer check on the execution delegate
- Anza / Agave: remote memory exhaustion via gossip-vote maps; fix shipped on all clusters
- SPL Token-2022: state corruption locking deposited SOL
- Nervos CKB: critical deserialization flaw in the DAO withdrawal path
- Ledger: Stellar application finding
- Conflux: Go SDK signed EIP-1559 transactions with priority fee equal to max fee

## Entity
- Legal name: Brantschen Labs
- Legal form: Swiss sole proprietorship (Einzelunternehmen)
- UID: CHE-150.729.871
- Founder: Tobias Brantschen, Informatiker EFZ (2012), ISC2 Certified in Cybersecurity
- Seat: Dorfstrasse 31, 3924 St. Niklaus, Valais, Switzerland
- On-site: Bern and Valais; remote across Switzerland