Thoralf Mue contributed to embedded cryptocurrency wallet development by enhancing compatibility and maintainability across two major repositories. On LedgerHQ’s ledger-app-database, he focused on C-based dependency updates, aligning IOTA application integrations to reduce technical debt and ensure stability without introducing user-facing changes. For KeystoneHQ’s keystone3-firmware, he implemented IOTA chain type support in the hardware wallet’s derivation path logic, mapping IOTA to m/44'/4218' within Rust code to enable accurate transaction handling. His work demonstrated a methodical approach to maintenance and feature delivery, emphasizing traceability, backward compatibility, and robust validation through continuous integration and targeted code improvements in C and Rust.