Medium Blockchain Developer questions

34 questions · 10 points each for a correct first answer.

1. 1.Spot the reentrancy bugsecurity, reentrancymedium
2. 2.Using tx.origin for authsecurity, access-controlmedium
3. 3.Packing storage variablesgas, soliditymedium
4. 4.Custom errorssolidity, gasmedium
5. 5.Upgrading a proxy safelyupgradeability, securitymedium
6. 6.Front-running a swapmev, defimedium
7. 7.Fuzz tests in Foundrytesting, foundrymedium
8. 8.Overflow in Solidity 0.8solidity, securitymedium
9. 9.Base fee and priority feeevm-fundamentals, gas-optimisationmedium
10. 10.Predicting a CREATE2 addressevm-fundamentalsmedium
11. 11.Refunding outbid bidderssmart-contract-security, soliditymedium
12. 12.Safer ownership transfersmart-contract-security, openzeppelinmedium
13. 13.Tokens that return nothingtoken-standards, openzeppelinmedium
14. 14.Fee-on-transfer token depositstoken-standards, smart-contract-securitymedium
15. 15.EIP-712 domain separatorcryptography, smart-contract-securitymedium
16. 16.Approving with a signaturetoken-standards, cryptographymedium
17. 17.Unchecked ecrecovercryptography, smart-contract-securitymedium
18. 18.expectRevert in the wrong placetesting-and-fuzzing, foundrymedium
19. 19.Testing against real protocolstesting-and-fuzzing, foundrymedium
20. 20.Invariant teststesting-and-fuzzing, foundrymedium
21. 21.What Slither is good forsmart-contract-security, slithermedium
22. 22.Transient storage locksgas-optimisation, evm-fundamentalsmedium
23. 23.Blobs and rollup feeslayer-2, evm-fundamentalsmedium
24. 24.Reading vs writing with viemdapp-frontend, viemmedium
25. 25.When to show "payment received"dapp-frontend, blockchain-fundamentalsmedium
26. 26.Showing a user's historydapp-frontend, the-graphmedium
27. 27.Chain ID in transactionscryptography, blockchain-fundamentalsmedium
28. 28.Reset that does not resetsoliditymedium
29. 29.UUPS vs transparent proxyupgradeability, openzeppelinmedium
30. 30.Constructors behind a proxyupgradeability, openzeppelinmedium
31. 31.Unlimited token approvalstoken-standards, smart-contract-securitymedium
32. 32.Random winners on chainsmart-contract-securitymedium
33. 33.SELFDESTRUCT after Dencunevm-fundamentalsmedium
34. 34.Roles instead of one ownersmart-contract-security, openzeppelinmedium