Smart contract business logic security
Business logic vulnerabilities arise when valid code executes behavior that violates a protocol's intended rules. BitsLab AI analyzes functions, permissions, state changes and interactions to help reviewers investigate those risks in context.
Questions to ask about a protocol
- Permissions: can an unauthorized account change configuration, mint assets or withdraw funds?
- State transitions: can a claim, withdrawal or settlement be repeated or executed in the wrong order?
- Accounting: do balances, shares, rounding and debt remain consistent across functions?
- External interactions: can callbacks or unexpected dependencies break a state assumption?
- Protocol assumptions: do integrations, oracle inputs and privileged roles behave as the design expects?
These are review questions, not a guarantee that any scanner detects every instance.
Supply the context an alert cannot infer reliably
Document actor roles, authorization rules, accounting invariants, external dependencies and valid lifecycle transitions. Compare those intended rules with the actual code paths. An operation that looks dangerous may be intentional; a harmless-looking call may violate a protocol-specific invariant.
Example: a missing withdrawal permission
If a treasury is meant to allow only its owner to withdraw, an unrestricted withdrawal function violates that rule even when the transfer itself is implemented correctly. The illustrative report includes vulnerable and remediated code, an unauthorized-call test and a test that the owner can still withdraw.
The example is educational and does not represent a customer incident or a scanner performance result.
Connect a finding to evidence and retesting
Review the affected path, the required preconditions and the security property at risk. Use PoC validation where supported, inspect the test assumptions, then verify the fix and intended behavior. Combine this process with independent professional review before deployment.