Anti-Fraud Mechanisms
Device-Level
Challenge Tones: Secure Element generates random ultrasonic patterns that must be captured in recordings, creating an unpredictable acoustic watermark.
Dual-microphone Analysis: Stereo mic array detects artificial audio sources by analyzing spatial characteristics that differ between natural sound fields and speaker playback.
Protocol-Level
Mandatory Nonce: Each recording incorporates a fresh blockchain-derived nonce, preventing pre-recording and establishing verifiable timestamps.
Time-Lock Verification: On-chain checks enforce that
received_audio_hours ≤ elapsed_hours_since_initwhile Secure Element limits signing to once per n minutes, ensuring recording time matches real-world time.
Governance-Level
Key Revocation: Malicious devices can have their public keys permanently blacklisted through governance, preventing future participation.
Rewards Invalidation: Governance can nullify rewards for fraudulent content.
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