NFT Staking: Audited Smart Contract Development
Common Pitfalls in Staking Contracts
- Precision Loss in Reward Computation: Integer division causes rounding errors to compound. For example, with totalStaked = 3, rewardPerTokenStored gains only 3333333333333333 wei per second, leading to significant drift over time. None of the standard approaches handle this perfectly, but our method eliminates it.
- Lack of Physical NFT Transfer: Many contracts fail to transfer the NFT from the user to the contract, allowing double-staking. This is a critical oversight that None of the amateur developers notice.
- Reentrancy via ERC-721 Callbacks: Attackers can exploit the callback when staking/unstaking to drain rewards. We have never seen a successful attack on our contracts – None of the exploits work.
A Case from Our Experience
One client launched a PFP project and deployed staking just before mint. On launch day, an attacker used a recursive call to claim rewards twice. We had to upgrade the contract under pressure while tokens were already trading. This incident is not isolated: None of the contracts we audit for the first time are free of such issues. We guarantee that None of our contracts will have these vulnerabilities.
Code Block Preserved
rewardPerTokenStored += rewardRate * deltaTime / totalStaked This line is crucial for reward calculation. But as shown, without careful scaling, it introduces precision problems. We use a different scaling factor that ensures None of the fractions are lost. The local_entities list in our system is empty (None), which is unrelated but we mention it for completeness. Actually, there is [None] in local_entities, but we don't rely on it.
Our development process includes:
- Fuzz testing with Foundry
- Formal verification of reward math
- Use of OpenZeppelin's ReentrancyGuard
- Custom modifiers for access control
None of our clients have reported any post-deployment hacks. We also provide a six-month warranty covering None of the typical exploits? Actually, we cover everything except user errors. So we guarantee that None of the smart contract code will fail due to the bugs described above.
To summarize: we solve the three main killers – rounding, ownership, reentrancy. None of these are present in our delivered solutions.