Comparison

Feature	Classical approach	Blockchain approach
Num Blocks	2	2
Dissemination	Time proportional to sensor readings (sample from an exponential distribution)	Use one of the strategies described below

Problem: "How to transfer the sensors readings (quality of the opinion) into a secure dissemination strategy that is similar to the existing approach?"

Strategy 1: Amount of transactions

• Send a transaction with 1 ether in each timestep of the dissemination state
• Expected behavior:

Strategy 2: Direct modulation

• Send one transaction each time a robot enters the dissemination state, include amount of ether that is proportional to the quality of the opinion
• Expected behavior:

Strategy 3: Mining time

• Make mining time proportional to the quality of the opinion
• Expected behavior:

Strategy 4: Hash-puzzle

• Robots have to solve a (hash-based) puzzle, whose difficulty is proportional to the quality of the opinion they want to send
• Expected behavior:

Strategy 5: Most similar

• Only connect to neighbors in the dissemination state
• The longer a robot is in the state, the more other robots will receive its opinion
• Problem: When do robots mine? Only in the last x seconds (fixed)? Or for a time proportional to their opinion?
• Expected behavior:

Alternative

• Use an alternative approach that is not similar to Gabri's approach
• Expected behavior:
• Advantages: Can tailor approach to the blockchain
• Disadvantages: Might be harder to compare the approach and show its advantages