Smart contract security checklist (practical & short)

1) Access control

• Which functions require onlyOwner / roles?
• Any bypass paths (e.g. bad owner setters)?

2) Reentrancy

• Any external call before state updates?
• Are you following CEI (Checks-Effects-Interactions)?

3) Input validation

• Clear require checks with helpful messages
• Avoid magic numbers; use constants

4) Tests & simulations

• Unit test failing cases
• Fuzz/property tests (when possible)

Wrap-up

This doesn’t replace an audit, but it removes many “obvious” issues before mainnet.