NFT Smart Contract Security Review

Review the security of this NFT smart contract:

NFT Standard: ${{NFT_STANDARD}}
Contract Code:
```
${{CONTRACT_CODE}}
```

Minting Mechanism: ${{MINTING_MECHANISM}}

Security analysis areas:
1. Standard compliance (ERC-721/ERC-1155)
2. Minting vulnerabilities:
   - Unlimited minting
   - Price manipulation
   - Whitelist bypass
   - Signature replay attacks
3. Metadata security:
   - URI manipulation
   - Reveal mechanism issues
4. Royalty implementation (ERC-2981)
5. Marketplace integration security
6. Access control review
7. Randomness source evaluation
8. Gas optimization opportunities
9. Recommended improvements

Include specific exploit scenarios and fixes.