1. Unauthorized Withdrawals

   • Risk: High
   • Mitigation: PDA-based accounts ensure only owner can withdraw
   • Status: ✅ Protected

2. Integer Overflow/Underflow

   • Risk: High
   • Mitigation: All arithmetic uses checked_add/checked_sub
   • Status: ✅ Protected

3. Reentrancy Attacks

   • Risk: Low (Solana transactions are atomic)
   • Mitigation: Single transaction execution model
   • Status: ✅ Protected

4. Unauthorized Lock/Unlock

   • Risk: High
   • Mitigation: VaultAuthority PDA with authorized programs list
   • Status: ✅ Protected

5. Race Conditions

   • Risk: Medium
   • Mitigation: Atomic transaction execution
   • Status: ✅ Protected

All instructions validate authority:

// Withdraw authority check
require!(vault.owner == ctx.accounts.user.key(), ErrorCode::Unauthorized);

// Lock/Unlock authority check
require!(
    vault_authority.authorized_programs.contains(&ctx.accounts.caller_program.key()),
    ErrorCode::UnauthorizedProgram
);

1. Deposit: Amount > 0
2. Withdraw:
   • Amount > 0
   • Available balance >= amount
   • Owner verification
3. Lock:
   • Amount > 0
   • Available balance >= amount
   • Authorized program check
4. Unlock:
   • Amount > 0
   • Locked balance >= amount
   • Authorized program check

All arithmetic operations use checked methods:

vault.total_balance = vault
    .total_balance
    .checked_add(amount)
    .ok_or(ErrorCode::Overflow)?;

This prevents:

• Integer overflow
• Integer underflow
• Unexpected wraparound

• Derived from user's public key
• Cannot be guessed or manipulated
• Ensures one vault per user

• Single global authority
• Manages authorized programs
• Prevents unauthorized CPIs

require!(amount > 0, ErrorCode::InvalidAmount);

.checked_add().ok_or(ErrorCode::Overflow)?

require!(vault.owner == user.key(), ErrorCode::Unauthorized);

All state changes emit events for auditability.

All state updates happen atomically within a single transaction.

• All arithmetic uses checked operations
• All authority checks are present
• All balance validations are correct
• PDA derivations are correct
• Error codes are comprehensive
• Events are emitted for all state changes

• Unauthorized withdrawal attempts fail
• Overflow/underflow scenarios are handled
• Balance calculations are correct
• Lock/unlock operations work correctly
• Transfer operations are secure

1. No Withdrawal Delays: Withdrawals are immediate (can be added if needed)
2. No Multi-Signature: Single owner per vault (can be extended)
3. No Rate Limiting: No built-in rate limiting (handled at API level)

1. Withdrawal Delays: Add time-locked withdrawals for security
2. Multi-Signature Support: Enable multi-sig vaults
3. Emergency Pause: Add pause mechanism for emergencies
4. Withdrawal Limits: Add daily withdrawal limits