Along with the proxy-voting system, the currency system would ideally be simultaneously run on 3-5 redundant server stacks, each built and run by a different team.
Each system in the pool is maintained by a unique non-profit organization, with their own source-code, but all running to the exact same specifications.
Each stack would receive identical input and must produce identical results.
In the case of a hacked or malfunctioning system producing different output, it would be removed from the pool until the source of the problem could be diagnosed and repaired.