Function generate_claim_key 

pub fn generate_claim_key(
    participant_id: [u8; 32],
    epoch: u64,
    participant_type: u8,
    claim_type: u8,
) -> [u8; 32]

Generate a unique claim key for tracking claims.

The claim key is a hash of participant ID, epoch, participant type, and claim type. This ensures each claim is uniquely identifiable and prevents double-spending.

Parameters

• participant_id: 32-byte participant ID (wallet hash)
• epoch: Epoch number
• participant_type: 0 = customer, 1 = merchant
• claim_type: 1 = payment only, 3 = payment + social

Returns

• 32-byte claim key hash

Security

• Unique: Each (participant, epoch, type) combination has unique key
• Collision Resistant: Uses SHA-256 for cryptographic security
• Deterministic: Same inputs always produce same key