Application Scenario

• General properties for a application scenario
  • Robots work remotely, without real-time supervision (e.g., deep sea, planetary exploration, or underground); they can only communicate in a peer-to-peer manner; there is no central trusted source of information
  • The swarm should come to consensus; no robot should be able to do something without getting automatically punished or rewarded
  • Robots should be fully autonomous (that is no single point of failure, no one can just press a button and stop them)
  • The swarm should be ablte to add new members at any time (there is no need of authentification, any robot can join)
  • The swarm members are untrusted
  • Physical Proof of Work
  • Robots possibly belong to different organizations (e.g. collaboration between different countries)

• Challenges
  • Robots are computationally limited devices. Therefore, they can only perform proof-of-work with limited difficulty. What happens if a much more powerful attacker performs a 51% attack?

• Q: Why do you use physical robot and not just simulation?
  • Simulations can never capture all aspects of the real-world
  • The goal is to pave the way for real-world robot task -> physical provide a proof-of-concept

• Q: Why don't you just use a classicial consensus algorithm?

Other existing consensus algorithms (apart from blockchain technology) are susceptible to Sybil attacks or only provide consensus to a small degree

• Q: Why don't you use a authentification system to only include trusted members?
  • A classical authentification system can be easily compromised (e.g., once the password is revealed, the entire system breaks down)
  • The swarm is more flexible without a authentification system: everyone can join at any time