Expert Q&A
Ask Cyfrin Updraft community experts
Posts
190- Expert Q&A
Jan 30, 2025Deployments on Layer 1
I have learnt to deploy a simple smart contract on a testnet using Remix. What is the best practice procedure for deplying a DeFi protocol into any layer 1 or 2 network? Do you use Remix, do you use any CLI or any other alternative? Is any of them safer than the other? and why is chosen that procedure against the other 2? For example, when the Uniswap team deployed Uniswap code into Ethereum layer 1, how did they deploy the code? Thanks
- Cyfrin Updraft
- Blockchain
- Smart Contract
01 - Expert Q&AJan 04, 2025
Foundry Solidity Test
What could wrong in my code? function testFundUpdatesFundedDataStructure() public { fundMe.fund{value: 10e18}(); uint256 amountFunded = fundMe.getAddressToAmountFunded(address(this)); assertEq(amountFunded, 10e18); } getting this error: [14658] FundMeTest::testFundUpdatesFundedDataStructure() ├─ [2658] FundMe::fund{value: 1000000000000000000}() │ ├─ [0] 0x0000000000000000000000000000000000000000::latestRoundData() [staticcall] │ │ └─ ← [Stop] │ └─ ← [Revert] EvmError: Revert └─ ← [Revert] EvmError: Revert
- Cyfrin Updraft
- Foundry
- Solidity
13 - Expert Q&ADec 19, 2024
Zksync Foundry Install
seems the zksync foundry installation, isn't in the github repo anymore, i tried to type the command line into my terminal "permission denied, could not read from remote repository"
- Cyfrin Updraft
- Foundry
- Solidity
12 - Expert Q&ADec 14, 2024
Setting up SimpleStorage Deployer
Why do i keep getting this error when trying to deploy my code in VS code, asked AI and it's still the same. Here is the error: [⠊] Compiling... [⠢] Compiling 14 files with Solc 0.8.18 [⠆] Solc 0.8.18 finished in 149.20ms Error: Compiler run failed: Error (2314): Expected ';' but got identifier --> script/DeploySimpleStorage.s.sol:11:9: | 11 | vm.stopBroadcast(); | ^^ And here is my code. solidity ''' // SPDX-License-Identifier: MIT pragma solidity ^0.8.18; import {Script} from "forge-std/Script.sol"; import {SimpleStorage} from "../src/SimpleStorage.sol"; contract DeploySimpleStorage is Script { function run() external returns (SimpleStorage) { vm.startBroadcast(); SimpleStorage simpleStorage = new SimpleStorage(); vm.stopBroadcast(); return simpleStorage; } } '''
- Cyfrin Updraft
- Foundry
- Solidity
11 - Expert Q&ADec 12, 2024
Setting Foundry
While trying to set my foundry after installing using the "forge init" command, i got this error: Error: failed to commit (code=Some(128), stdout="", stderr="Author identity unknown\n\n* Please tell me who you are.\n\nRun\n\n git config --global user.email \"you@example.com\"\n git config --global user.name \"Your Name\"\n\nto set your account's default identity.\nOmit --global to set the identity only in this repository.\n\nfatal: unable to auto-detect email address (got 'user@MACs-MBP.(none)')") Though I was able to get all the folder I needed, except from "lib" and ".gitmodules" hope this won't affect me in future. And i also try using the "forge init --force" still the same
- Cyfrin Updraft
- Foundry
- Solidity
12 - Expert Q&AMar 29, 2024
What are the recommended protocols for smart contract audit?
I am looking to conduct a smart contract audit and would like to know the best protocols to follow. Can anyone suggest a wide range of protocols that are commonly used in competitive audits? Any insights or recommendations would be greatly appreciated. Thank you.
- Foundry
- Security
- Blockchain
01Official Answer - Expert Q&AMar 29, 2024
Error `make deploy` in VS Code - `bash: make: command not found`
I am encountering an issue while trying to deploy using make deploy in VS Code with Foundry and Anvil. Despite Anvil launching properly without any errors, when I attempt to deploy using the command make deploy, I consistently receive the error message bash: make: command not found. Has anyone faced a similar problem or can provide guidance on resolving this issue? Any assistance would be greatly valued as I have been unable to progress since yesterday. Thank you.
- Foundry
01Official Answer - Expert Q&AMar 29, 2024
Which function selector and input data should be used in solveChallenge?
I am working on the solveChallenge function which requires a function selector and input data to be passed. I am unsure about which function I should get the function selector for, and what the input data should be that needs to be turned into bytes. Any guidance on this would be greatly appreciated. Thank you in advance for your help. function solveChallenge(bytes4 selectorOne, bytes memory inputData, string memory yourTwitterHandle) external { (bool successOne, bytes memory responseDataOne) = i_helperContract.call(abi.encodeWithSelector(selectorOne)); if (!successOne || uint256(bytes32((responseDataOne))) != 1) { revert S1__WrongSelector(); } (bool successTwo, bytes memory responseDataTwo) = i_helperContract.call(inputData); if (!successTwo || uint256(bytes32((responseDataTwo))) != 1) { revert S1__WrongData(); } _updateAndRewardSolver(yourTwitterHandle); } I am motivated to understand how to find the solution, not just for obtaining the NFT. Thank you for your assistance.
- Transaction
- Solidity
- Smart Contract
01Official Answer - Expert Q&AMar 29, 2024
How to Report Multiple Instances of an Attack Vector in Base Code?
I have encountered the same attack vector multiple times in a base code. Should I include each instance separately in my report or consolidate them into a single entry? For instance, if I identify a Denial of Service (DOS) attack in three different functions, should I classify these findings as three distinct high-severity issues in my report, or combine them into a single report entry for efficiency and clarity? Any insights on the best approach for reporting such repeated vulnerabilities would be greatly appreciated. Thank you.
- Security
01Official Answer - Expert Q&AMar 29, 2024
Seeking Small LaTeX Package for Linux Installation
I attempted to install LaTeX on my Linux machine using sudo apt-get install texlive-full, which consumed over 7 GB of storage, causing my 120 GB SSD system to run out of space. As a result, I had to remove it. Could someone provide a link to a smaller LaTeX package (less than 1 GB) that is sufficient for my needs? Any guidance or recommendations would be greatly appreciated. Thank you.
- Foundry
- Course
01Official Answer
- 1780
- 75
- 60
- 20
- 15
- 12
- 11
- 11
- 10
- 10
- Solidity
- Smart Contract
- Transaction
- Foundry
- Blockchain
- Gas
- Security
- Cyfrin Updraft
- Course
- erc20