Add MillionaireComparison contract implementing Yao's Millionaires' Problem

[plucena-coti]

Summary

• Implements Yao's Millionaires' Problem using COTI's MPC framework
• Allows two parties (Alice and Bob) to securely compare their wealth without revealing actual amounts
• Uses encrypted computation to preserve privacy while determining who is wealthier

Features

• Privacy-preserving wealth comparison using MPC operations
• Secure encrypted input submission for both parties
• Comparison results encrypted separately for each party
• Event emissions for tracking operations
• Reset functionality for testing

Test plan

• Compile the contract successfully
• Deploy contract with Alice and Bob addresses
• Test Alice and Bob submitting encrypted wealth values
• Verify comparison logic for all cases (Alice richer, Bob richer, equal)
• Confirm only authorized parties can view their respective results
• Test edge cases and access control

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud