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Side Entrance - Damn Vulnerable DeFi | CTF
Damn Vulnerable DeFi is a CTF challenge illustrating hacks in DeFi. In this video I explain how to beat the 4th challenge - side entrance.
Setup and challenge - 0:06
Code - 0:24
Solution - 1:22
#Solidity #SmartContract #Ethereum #CTF #DeFi #スマートコントラクト
CTF
https://www.damnvulnerabledefi.xyz/
Code with solutions
https://github.com/t4sk/damn-vulnerable-defi
Take a course
https://www.smartcontract.engineer/
Follow
https://twitter.com/ProgrammerSmart
https://discord.gg/bt8FK2wkcW
https://t.me/smartcontractprogrammer
https://smartcontractprogrammer.com -
Error | Solidity 0.8
Solidity has 3 ways to throw an error: require, revert and assert. From Solidity 0.8 custom errors can be declared.
#Solidity #SmartContract #Ethereum #スマートコントラクト
Remix
https://remix.ethereum.org
Code
https://solidity-by-example.org/error/
Take a course
https://www.smartcontract.engineer/
Follow
https://twitter.com/ProgrammerSmart
https://discord.gg/bt8FK2wkcW
https://t.me/smartcontractprogrammer
https://smartcontractprogrammer.com -
For and While Loops | Solidity 0.8
Examples of for and while loops in Solidity
#Solidity #SmartContract #Ethereum #スマートコントラクト
Remix
https://remix.ethereum.org
Code
https://solidity-by-example.org/loop/
Take a course
https://www.smartcontract.engineer/
Follow
https://twitter.com/ProgrammerSmart
https://discord.gg/bt8FK2wkcW
https://t.me/smartcontractprogrammer
https://smartcontractprogrammer.com -
If Else | Solidity 0.8
This video explains how to write an if / else conditional statement in Solidity.
There is also a shorthand way to write conditional statements using ternary operators.
#Solidity #SmartContract #Ethereum #スマートコントラクト
Remix
https://remix.ethereum.org
Code
https://solidity-by-example.org/if-else/
Take a course
https://www.smartcontract.engineer/
Follow
https://twitter.com/ProgrammerSmart
https://discord.gg/bt8FK2wkcW
https://t.me/smartcontractprogrammer
https://smartcontractprogrammer.com -
Truster - Damn Vulnerable DeFi | CTF
Damn Vulnerable DeFi is a CTF challenge illustrating hacks in DeFi. In this video I explain how to beat the 3rd challenge - truster.
Setup and challenge - 0:11
Code - 0:32
Solution - 1:42
#Solidity #SmartContract #Ethereum #CTF #DeFi #スマートコントラクト
CTF
https://www.damnvulnerabledefi.xyz/
Code with solutions
https://github.com/t4sk/damn-vulnerable-defi
Take a course
https://www.smartcontract.engineer/
Follow
https://twitter.com/ProgrammerSmart
https://discord.gg/bt8FK2wkcW
https://t.me/smartcontractprogrammer
https://smartcontractprogrammer.com -
Constants | Solidity 0.8
Constants are variables that cannot be modified. Replacing variables with constants can reduce gas cost of calling function on the smart contract.
#Solidity #SmartContract #Ethereum #スマートコントラクト
Remix
https://remix.ethereum.org
Code
https://solidity-by-example.org/constants/
Take a course
https://www.smartcontract.engineer/
Follow
https://twitter.com/ProgrammerSmart
https://discord.gg/bt8FK2wkcW
https://t.me/smartcontractprogrammer
https://smartcontractprogrammer.com -
Default Values | Solidity 0.8
Uninitialized variables in Solidity have a default value.
#Solidity #SmartContract #Ethereum #スマートコントラクト
Remix
https://remix.ethereum.org
Code
https://solidity-by-example.org/primitives/
Take a course
https://www.smartcontract.engineer/
Follow
https://twitter.com/ProgrammerSmart
https://discord.gg/bt8FK2wkcW
https://t.me/smartcontractprogrammer
https://smartcontractprogrammer.com -
Counter | Solidity 0.8 Application
Let's build a basic application in Solidity. A counter.
#Solidity #SmartContract #Ethereum #スマートコントラクト
Remix
https://remix.ethereum.org
Code
https://solidity-by-example.org/first-app/
Take a course
https://www.smartcontract.engineer/
Follow
https://twitter.com/ProgrammerSmart
https://discord.gg/bt8FK2wkcW
https://t.me/smartcontractprogrammer
https://smartcontractprogrammer.com -
View and Pure Functions | Solidity 0.8
Both view and pure functions cannot write to the blockchain. They are read-only functions. What's the difference between view and pure functions? View functions can read data from the blockchain such as state and global variables. Pure functions cannot.
#Solidity #SmartContract #Ethereum #スマートコントラクト
Remix
https://remix.ethereum.org
Code
https://solidity-by-example.org/view-and-pure-functions/
Take a course
https://www.smartcontract.engineer/
Follow
https://twitter.com/ProgrammerSmart
https://discord.gg/bt8FK2wkcW
https://t.me/smartcontractprogrammer
https://smartcontractprogrammer.com -
Simple Trick to Reduce Solidity Code Size
Solidity has a code size limit of 24 Kb. There is a simple trick to reduce the size of your code. Wrap code inside function modifier into a private / internal function.
#Solidity #SmartContract #Ethereum #スマートコントラクト
Remix
https://remix.ethereum.org
Take a course
https://www.smartcontract.engineer/
Follow
https://twitter.com/ProgrammerSmart
https://discord.gg/bt8FK2wkcW
https://t.me/smartcontractprogrammer
https://smartcontractprogrammer.com -
Naive Receiver - Damn Vulnerable DeFi | CTF
Damn Vulnerable DeFi is a CTF challenge illustrating hacks in DeFi. In this video I explain how to beat the second challenge - naive receiver.
0:12 - Setup and challenge
0:33 - Code
3:04 - Solution
#Solidity #SmartContract #Ethereum #CTF #DeFi #スマートコントラクト
CTF
https://www.damnvulnerabledefi.xyz/
Code with solutions
https://github.com/t4sk/damn-vulnerable-defi
Take a course
https://www.smartcontract.engineer/
Follow
https://twitter.com/ProgrammerSmart
https://discord.gg/bt8FK2wkcW
https://t.me/smartcontractprogrammer
https://smartcontractprogrammer.com -
Global Variables | Solidity 0.8
Global variables contain information about blockchain, transaction and caller of the function. This video explains some global variables that you will use often in Solidity.
#Solidity #SmartContract #Ethereum #スマートコントラクト
Remix
https://remix.ethereum.org
Code
https://solidity-by-example.org/variables/
Take a course
https://www.smartcontract.engineer/
Follow
https://twitter.com/ProgrammerSmart
https://discord.gg/bt8FK2wkcW
https://t.me/smartcontractprogrammer
https://smartcontractprogrammer.com