The Gold Standard for
Smart Contract Defense.
XAU Security Labs operates as an independent defensive research unit. We eliminate critical vulnerability vectors across EVM and Solana protocols through invariant property fuzzing, symbolic execution, and authorized bug mitigation.
XAU Security Labs
Test Protocol Invariants in Real-Time
Select a target vulnerability vector below to execute an automated invariant stress test using symbolic execution and stateful fuzzing simulation.
VaultCore.sol
Solidity 0.8.28
// Sample Vulnerability Pattern
function withdraw(uint256 amount) external {
uint256 bal = balances[msg.sender];
require(bal >= amount, "Insufficient");
// Invariant risk: external call before balance update
(bool s, ) = msg.sender.call{value: amount}("");
require(s, "Transfer failed");
balances[msg.sender] -= amount;
}
End-to-End Defensive Engineering
Our auditing framework merges rigorous manual verification with modern symbolic execution and invariant fuzz testing.
Manual Code Review & Architecture
Line-by-line manual code inspection to identify logic flaws, access control omissions, rounding errors, and cross-function anomalies in Solidity & Rust.
Stateful Invariant Fuzzing
Designing custom Foundry & Echidna invariant suites to stress-test economic solvency under multi-transaction sequences and extreme market conditions.
Remediation & Patch Assurance
Active collaboration with protocol teams to write safe mitigation patches, verify fixes against regressions, and certify post-audit upgrades.
Oracle & Flash Loan Defense
Auditing spot/TWAP pricing mechanisms, Chainlink fallback mechanics, and evaluating collateral liquidation durability against flash loan manipulation.
DeFi Lending & Vault Modeling
Verification of ERC-4626 vault share calculations, yield compounding logic, debt ceiling rebalancing, and bad debt socialized liquidation pathways.
Dual Defense & Bug Bounties
Independent participation in competitive auditing platforms (Sherlock, HackenProof) adhering to authorized rules of engagement.
Audit Scope & Timeline Estimator
Estimate the recommended audit duration and invariant testing passes based on your protocol's Source Lines of Code (nSLOC).
Vulnerability Case Files & Remediation
ERC-4626 Share Inflation on First Deposit
Identified exchange rate manipulation allowing malicious first depositors to steal subsequent depositor funds via rounding truncation.
Chainlink Sequencer Grace Period Omission
L2 lending protocol failed to check Arbitrum sequencer uptime feed, enabling outdated price liquidations immediately upon sequencer recovery.
Bad Debt Socialization Underflow
Defective balance subtraction during underwater position liquidation caused complete protocol freezing due to panic underflow.
Defensive Ethics & Compliance Standard
100% Defensive Mandate
All research activities performed by XAU Security Labs are strictly restricted to local forks, consenting audit clients, and authorized bug bounty scope. We do not engage in unauthorized exploitation.
Coordinated Vulnerability Disclosure
Vulnerabilities are reported confidentially to development teams with reproducible test suites and remediation patches before any public disclosure occurs.
Hardware-Enforced Security
All administrative credentials and OpenAI workspace connections are protected by physical FIDO2 hardware security keys, preventing credential interception.
Zero Data Leakage Policy
Client code and proprietary architecture designs are kept in ephemeral, encrypted containers and never used to train public machine learning datasets.